Interim report
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Contents INTERIM REPORT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Fortum signed its largest-ever PPA – comparable operating profit increased in the third quarter . . . . . . . . . . . . . . . . . . . . . . 3 Fortum’s President and CEO Markus Rauramo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Fortum’s strategy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Financial results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Financial position and cash flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Segment reviews . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Capital expenditures, divestments and investments in shares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Operating and regulatory environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Key drivers and risks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Outlook . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Sustainability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Group personnel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Legal actions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Shares and share capital . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Board authorisations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Events after the balance sheet date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 INTERIM FINANCIAL STATEMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Condensed consolidated income statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Condensed consolidated statement of comprehensive income . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Condensed consolidated balance sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Condensed consolidated statement of changes in total equity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Condensed consolidated cash flow statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Change in net debt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Capital risk management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Key figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Notes to the condensed consolidated interim financial statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 1 Significant accounting policies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 2 Critical accounting estimates and judgements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 3 Segment information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 4 Comparable operating profit and comparable net profit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 5 Financial risk management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 6 Acquisitions and disposals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 7 Share of profit/loss of associates and joint ventures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 8 Finance costs – net . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 9 Income taxes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 10 Dividend per share . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 11 Interest-bearing receivables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 12 Interest-bearing net debt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 13 Nuclear-related assets and liabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 14 Capital and other commitments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 15 Pledged assets and contingent liabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 16 Legal actions and official proceedings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 17 Related party transactions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 18 Events after the balance sheet date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 19 Definitions and reconciliations of key figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Market conditions and achieved power prices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 Fortum's production and sales volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 Figures in brackets refer to the comparison period, i.e. the same period last year, unless otherwise stated. Fortum Corporation January–September 2026 Interim Report
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INTERIM REPORT Fortum signed its largest-ever PPA – comparable operating profit increased in the third quarter July–September 2026 • Comparable EBITDA was EUR 182 (175) million. • Comparable operating profit was EUR 102 (97) million, supported by higher nuclear volumes. • Operating profit was EUR 72 (60) million. • Comparable earnings per share were EUR 0.08 (0.08). • Earnings per share were EUR 0.04 (0.06). • Cash flow from operating activities totalled EUR 134 (131) million. • Fortum and Google signed a 22-year nuclear Power Purchase Agreement (PPA) starting in 2028 with up to 50% of the Loviisa nuclear power plant's generation capacity contracted in 2030–2049. • After the reporting period, Fortum completed the acquisition of 91.92% of the Norwegian electricity retail company Elmera Group ASA; Elmera is expected to be consolidated into the Consumer Solutions segment from 31 October 2026. January–September 2026 • Comparable EBITDA was EUR 967 (903) million. • Comparable operating profit was EUR 729 (674) million, primarily due to higher spot prices and volumes. • Operating profit was EUR 699 (634) million. • Comparable earnings per share were EUR 0.61 (0.59). • Earnings per share were EUR 0.63 (0.58). • Cash flow from operating activities totalled EUR 813 (787) million. Summary of outlook • The Generation segment’s estimated Nordic generation hedges: approximately 80% at EUR 43 per MWh for the remainder of 2026, approximately 70% at EUR 42 per MWh for 2027 and approximately 45% at EUR 42 per MWh for 2028. • In 2026, the optimisation premium is expected to be 8–10 EUR/MWh, and from 2027 onwards 6–8 EUR/MWh. • UPDATED: In 2026, nuclear generation volumes are expected to be approximately 23.0 TWh (previously: 23.0–23.5 TWh). • For the period of 2026–2030, Fortum’s committed capital expenditure is expected to be approximately EUR 2.0 billion, excluding acquisitions. This includes growth capex of approximately EUR 750 million in total and maintenance capex of approximately EUR 250 million per year. For 2026, the total committed capital expenditure is expected to be approximately EUR 550 million, excluding acquisitions. Fortum Corporation January–September 2026 Interim Report
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Key figures EUR million or as indicated III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Reported Sales 1,114 929 4,229 3,545 4,989 5,673 Operating profit 72 60 699 634 939 1,004 Share of profit of associates and joint ventures -20 9 24 45 56 34 Net profit (after non-controlling interests) 31 52 561 520 765 807 Earnings per share, EUR 0.04 0.06 0.63 0.58 0.85 0.90 Net cash from operating activities 134 131 813 787 840 866 Number of employees 4,654 4,602 4,551 EUR million or as indicated III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Comparable EBITDA 182 175 967 903 1,240 1,303 Operating profit 102 97 729 674 924 979 Share of profit of associates and joint ventures -1 -1 -5 14 28 9 Return on net assets (RONA), % 10.9 10.9 Net assets (at period-end) 9,047 8,674 9,150 Net profit (after non-controlling interests) 65 70 544 531 739 751 Earnings per share, EUR 0.08 0.08 0.61 0.59 0.82 0.84 EUR million or as indicated 2025 LTM Financial position 1) Net debt (at period-end) 1,843 1,811 Net debt/comparable EBITDA 1.5 1.4 Financial net debt (at period-end) 1,479 N/A Financial net debt/comparable EBITDA 1.2 N/A 1) Following the transition of Nasdaq's Nordic power futures business to Euronext, Fortum reports Net debt instead of Financial net debt from the first quarter of 2026 onwards. See Note 12 Interest-bearing net debt. Fortum’s President and CEO Markus Rauramo "During the third quarter of 2026, we took significant steps in implementing our strategy and strengthening Fortum’s position as a partner for industrial and energy customers in the Nordics. Most importantly, we signed a 22-year nuclear power purchase agreement with Google, the largest sales agreement in Fortum's history. It is also the first large-scale lifetime extension nuclear PPA in Europe. The agreement provides economic certainty for the lifetime extension and power upgrade of the Loviisa nuclear power plant through 2050 and demonstrates the important role of nuclear power in meeting growing customer demand for reliable, low-carbon electricity. Alongside the agreement, we also signed a memorandum of understanding covering potential future cooperation in renewables, flexibility solutions, nuclear newbuild and overall energy portfolio management services for Google. We also continued to advance our Consumer Solutions business. In August, we launched a recommended voluntary cash tender offer for the Norwegian electricity retail company Elmera Group ASA. The acquisition was completed on 23 October following settlement of the shares tendered in the offer. The acquisition represents an important strategic growth step towards a larger and more efficient platform serving Nordic consumer and small- and medium-sized enterprise customers. We expect the combination to create value through scale benefits, operational efficiencies and strengthened commercial capabilities, benefiting customers and shareholders. Elmera is expected to be consolidated into Fortum’s financial statements as part of the Consumer Solutions segment from 31 October 2026. During the third quarter, Nordic spot prices increased compared to the previous year – doubling in some areas – while Finland was the exception. The increase was driven by lower hydro reservoir levels, lower nuclear availability and exceptionally high Continental European power prices. Gas prices also increased sharply amid heightened geopolitical tensions and continued uncertainty regarding supply normalisation. Our comparable operating profit increased from the comparison period, primarily driven by higher nuclear generation volumes in the Generation segment. Consumer Solutions' result decreased from the exceptionally strong level recorded in the third quarter of 2025. Fortum Corporation January–September 2026 Interim Report 4
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Our financial position remained strong. Net debt amounted to EUR 1.8 billion and leverage, measured as Net debt-to-Comparable EBITDA, was 1.4 times. Our robust balance sheet and moderate leverage continue to provide strategic flexibility as we pursue value-creating growth opportunities. Long-term electricity demand remains robust, particularly from data centres, with activity in Finland at a very high level, and Fortum engaged in dialogue with a broad range of customers. Realisation of demand in the near term remains gradual, however, and industrial electrification projects continue to progress at different speeds, depending on the sector. Fortum is prioritising large strategic partnerships and repeat opportunities with customers through our diverse product offering at scale. The agreement with Google and the acquisition of Elmera demonstrate clear progress in the implementation of our strategy. We remain focused on operational excellence, capital discipline and profitable growth, building on our strong financial position." Fortum’s strategy Fortum’s strategic priorities are ‘deliver reliable energy to customers’, ‘drive decarbonisation in industries’, and ‘transform and develop’. The Group's business portfolio is built on hydro and nuclear generation, flexibility and optimisation, demand-driven renewables, electricity solutions business for consumers, and heating and cooling operations. Financial and environmental targets • Long-term Group Comparable RONA 14%. • To ensure a credit rating of at least BBB, Net debt-to-Comparable EBITDA can be a maximum of 2.5 times. S&P Global Ratings and Fitch Ratings currently rate Fortum as BBB+ with Stable Outlook. • To ensure the required returns for any potential new investments, Fortum continues to be selective and applies the set investment criteria: project-based WACC + 150–400 investment hurdles depending on the technology or investment project, as well as environmental targets. • Fortum’s dividend policy is a payout ratio of 60–90% of comparable EPS. The upper end of the pay-out ratio range is applied in situations with a strong balance sheet and low investments, while the lower end of the range is applied in situations with high leverage and/or significant investments and high capital expenditure. Fortum seeks to continue to pay competitive cash dividends. • Fortum expects its Comparable operating profit to improve by EUR 330 million by 2030 compared to the base line of EUR 930 million. This improvement is based on own actions and does not include effects from capital expenditure, M&A or power price changes. • Fortum has set ambitious environmental and decarbonisation goals with SBTi-validated climate targets, including net-zero greenhouse gas emissions across the value chain by 2040, coal exit by the end of 2027, targets for specific emissions, and biodiversity targets. Financial results Sales by segment EUR million III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Generation 615 590 2,614 2,327 3,245 3,533 Consumer Solutions 745 573 2,833 2,146 3,029 3,716 Other Operations 45 45 133 138 187 183 Netting of Nord Pool transactions -250 -220 -1,287 -798 -1,136 -1,625 Eliminations -42 -60 -64 -267 -336 -133 Total 1,114 929 4,229 3,545 4,989 5,673 Comparable EBITDA by segment EUR million III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Generation 175 142 894 798 1,098 1,194 Consumer Solutions 36 46 146 161 213 198 Other Operations -29 -13 -73 -55 -71 -89 Total 182 175 967 903 1,240 1,303 Fortum Corporation January–September 2026 Interim Report 5
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Comparable operating profit by segment EUR million III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Generation 121 92 734 648 893 979 Consumer Solutions 14 23 80 96 122 106 Other Operations -33 -18 -86 -70 -91 -106 Total 102 97 729 674 924 979 Operating profit by segment EUR million III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Generation 96 54 710 607 912 1,015 Consumer Solutions 12 25 78 100 127 105 Other Operations -36 -18 -89 -72 -100 -116 Total 72 60 699 634 939 1,004 July–September 2026 Sales increased to EUR 1,114 (929) million, driven by higher sales in both the Consumer Solutions and the Generation segment. Comparable operating profit increased to EUR 102 (97) million. The Generation segment result increased to EUR 121 (92) million, primarily due to higher nuclear volumes, partly offset by a somewhat lower achieved power price. The result for the Consumer Solutions segment decreased to EUR 14 (23) million, mainly due to lower electricity and gas margins compared to the record-high result in the comparison period. Operating profit for the period was impacted by EUR -30 (-36) million of items affecting comparability (Note 4). Comparable share of profits of associates and joint ventures was EUR -1 (-1) million (Note 7). Comparable earnings per share were EUR 0.08 (0.08) (Note 4.2). January–September 2026 Sales increased to EUR 4,229 (3,545) million, driven by higher sales in both the Consumer Solutions and the Generation segments, mainly as a result of higher power prices. Comparable operating profit increased to EUR 729 (674) million. The Generation segment result increased to EUR 734 (648) million, mainly as a result of higher spot prices as well as higher nuclear and hydro volumes, partly offset by a high hedge ratio. The result of the Consumer Solutions segment decreased to EUR 80 (96) million, mainly due to lower sales margins compared to the record-high result in the comparison period and higher fixed costs. Operating profit for the period was impacted by EUR -30 (-40) million of items affecting comparability (Note 4). Comparable share of profits of associates and joint ventures was EUR -5 (14) million (Note 7). Finance costs – net amounted to EUR -27 (-44) million. Comparable finance costs – net amounted to EUR -39 (-40) million (Note 8). Income taxes totalled EUR -135 (-117) million. The comparable effective income tax rate was 20.5% (18.8%) (Note 9). Net profit after non-controlling interests was EUR 561 (520) million and comparable net profit was EUR 544 (531) million. Comparable net profit is adjusted for items affecting comparability, adjustments to the share of profit of associates and joint ventures, finance costs – net, income tax expenses and non-controlling interests (Note 4.2). Earnings per share were EUR 0.63 (0.58). Comparable earnings per share were EUR 0.61 (0.59) (Note 4.2). Fortum Corporation January–September 2026 Interim Report 6
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Financial position and cash flow Cash flow In January–September 2026, net cash from operating activities increased and totalled EUR 813 (787) million, mainly due to higher comparable EBITDA. Net cash from investing activities totalled EUR -467 (-320) million. Capital expenditure amounted to EUR 347 (341) million. Acquisitions of shares totalled EUR 21 (57) million. The comparison period includes the acquisition of the Polish electricity solutions provider Orange Energia and a project development portfolio for renewable power from Enersense. Net cash used in financing activities totalled EUR -975 (-1,473) million. The net repayments of interest-bearing liabilities totalled EUR 331 (144) million, including a EUR 750 million bond repayment in February. The dividend of EUR 664 million for the year 2025, approved by the 2026 Annual General Meeting, was paid in April. The comparison period includes the 2024 dividend payment of EUR 1,256 million. Cash and cash equivalents decreased by EUR 629 (decrease 1,006) million and amounted to EUR 2,250 million on 30 September 2026. For further details, see the ‘Financing’ section below. Assets At the end of September 2026, total assets amounted to EUR 15,846 (31 Dec 2025: 16,444) million. The decline mainly reflects the repayment of the EUR 750 million maturing bond and the EUR 664 million dividend payment, offset by higher fair values of derivatives. Equity Total equity amounted to EUR 7,979 (31 Dec 2025: 8,620) million. Equity attributable to owners of the parent company totalled EUR 7,898 (31 Dec 2025: 8,539) million. Equity was negatively impacted by the 2025 dividend of EUR 664 million and by the EUR 514 million fair valuation of cash flow hedges, partly offset by the EUR 561 million net profit for the period. Financing The Group’s financial position continues to be solid. At the end of September 2026, the Group’s ratio for net debt-to-comparable EBITDA was at 1.4 times for the last twelve months (Note 12). At the end of September 2026, net debt was EUR 1,811 (31 Dec 2025: 1,843) million. Fortum’s total interest-bearing liabilities were EUR 4,136 (31 Dec 2025: 4,746) million and liquid funds amounted to EUR 2,325 (31 Dec 2025: 2,903) million. At the end of September 2026, Fortum’s long-term loans totalled EUR 3,563 million. Short-term loans amounted to EUR 477 million (Note 12). At the end of September 2026, Fortum had undrawn committed credit facilities of EUR 4,300 million. In addition, Fortum has committed overdraft limits of EUR 100 million that are valid until further notice. Fortum's current long-term credit rating by both S&P Global Ratings and Fitch Ratings is BBB+ with Stable Outlook. Fortum Corporation January–September 2026 Interim Report 7
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Segment reviews Generation Generation is responsible for power generation mainly in the Nordics. It is a customer interface for industrial and corporate customers to drive decarbonisation in industries and provide reliable energy at scale. The segment comprises hydro, nuclear, wind and solar power generation, as well as district heating and cooling, and decarbonisation of heat production assets. The Generation segment is responsible for hedging and value creation both in physical and financial power markets. EUR million III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Reported Sales 615 590 2,614 2,327 3,245 3,533 - power sales 530 513 2,151 1,926 2,642 2,867 of which Nordic outright power sales 1) 430 402 1,600 1,509 2,062 2,153 - heat sales 69 64 409 355 533 587 - other sales 17 13 54 46 70 79 Operating profit 96 54 710 607 912 1,015 Share of profit/loss of associates and joint ventures 2) -19 9 23 44 56 35 Capital expenditure and gross investments in shares 120 88 312 316 501 497 Number of employees 2,254 2,200 2,139 EUR million III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Comparable EBITDA 175 142 894 798 1,098 1,194 Operating profit 121 92 734 648 893 979 Share of profit/loss of associates and joint ventures 2) 0 0 -7 13 28 9 Return on net assets (RONA), % 11.8 12.4 Net assets (at period-end) 7,848 7,833 8,135 1) Nordic outright power sales includes hydro, nuclear and wind generation. It does not include CHP and condensing power generation, minorities, customer business, or other purchases. 2) Power plants are often built jointly with other power producers, and owners purchase power at cost. The share of profit/loss is mainly IFRS Accounting Standards adjustments (e.g., accounting for nuclear-related assets and liabilities) and depreciations on fair-value adjustments from acquisitions (Note 19 in the Consolidated Financial Statements 2025). Power generation by source TWh III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Hydropower, Nordic 4.0 4.2 14.3 13.2 18.5 19.6 Nuclear power, Nordic 5.6 4.6 16.9 16.0 22.1 22.9 Wind power, Nordic 0.2 0.2 0.6 0.7 1.0 0.9 CHP and condensing power 1) 0.0 0.1 0.5 0.5 0.7 0.8 Total 9.8 9.1 32.3 30.4 42.3 44.2 1) CHP and condensing power generation in Finland and Poland. Sales volumes TWh III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Power sales volume, Nordic 11.8 11.5 38.4 38.2 52.4 52.6 of which Nordic outright power sales volume 1) 9.4 8.7 30.7 28.9 40.1 42.0 Power sales volume, Other 0.0 0.1 0.3 0.4 0.6 0.5 Heat sales volume, Nordic 0.3 0.2 1.7 1.3 1.9 2.3 Heat sales volume, Other 0.2 0.2 2.4 2.2 3.6 3.7 1) The Nordic outright power sales volume includes hydro, nuclear and wind generation. It does not include CHP and condensing power generation, minorities, customer business, or other purchases. Fortum Corporation January–September 2026 Interim Report 8
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Achieved power price EUR/MWh III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Generation’s Nordic achieved power price 1) 45.5 46.1 52.1 52.3 51.4 51.3 1) The Nordic achieved power price includes hydro, nuclear and wind generation. It does not include CHP and condensing power generation, minorities, customer business, or other purchases. July–September 2026 The Generation segment’s total power generation increased from the comparison period. Nuclear volumes increased by 22%, driven by improved availability at Oskarshamn 3, which was subject to an unplanned outage for the entire third quarter of 2025, compared to nine days in the same period in 2026. Hydro generation volumes decreased by 5%, due to volume allocation to future periods. Wind power generation remained stable, while CHP and condensing power generation decreased. The achieved power price amounted to 45.5 EUR/MWh, a decrease of 1%, or 0.6 EUR/MWh. The achieved power price decreased, mainly due to a lower hedge price and reduced physical value creation, partly offset by a higher spot price. The blended spot power price in Fortum’s generation price areas increased to 46.0 EUR/MWh, compared to 36.7 EUR/MWh in the third quarter of 2025. Comparable operating profit increased by EUR 29 million, or 32%, to EUR 121 million, impacted mainly by the higher nuclear volume, partly offset by lower physical value creation. The result of the district heating business decreased somewhat, impacted mainly by reduced availability related to ongoing decarbonisation projects and lower power prices in Poland, partly offset by higher volumes in the Nordics. Operating profit was affected by EUR -25 (-38) million of items affecting comparability, mainly related to the fair value change of non- hedge-accounted derivatives (Note 3). Comparable share of profits of associates and joint ventures totalled EUR 0 (0) million. On 9 September, Fortum and Google signed a 22-year nuclear Power Purchase Agreement (PPA) that provides economic certainty for the lifetime extension and power upgrade of the Loviisa nuclear power plant through 2050. The PPA will start in 2028 with a smaller capacity and will reach 50% of the plant's capacity in 2030–2049. The PPA is expected to increase Fortum's Group comparable return on net assets (RONA) by approximately 1.4 percentage points over time, once 50% of the plant's generation capacity is contracted. Furthermore, the partners established a Memorandum of Understanding on the development of new nuclear, renewable capacities and flexibility solutions, as well as energy portfolio management services. On 27 August, Fortum announced that NuCore Energi, a Fortum-owned project company established to develop new nuclear power in Sweden, submitted a state aid application to initiate discussions with the Swedish state on the framework and conditions required to advance a new nuclear power project in Oskarshamn. Fortum and NuCore Energi have not made investment decisions at this stage. The final scope of the project, currently ranging from 1,200 to 3,400 MW of electricity, will depend on several factors, including technology selection, benefits of building multiple reactor units, expected growth in electricity demand in Sweden, as well as risk-sharing between the project and the state, making the project viable and financeable for the owners. January–September 2026 The Generation segment’s total power generation increased from the comparison period. Hydro generation volumes increased by 8% but were still slightly below the long-term historic average, with part of the volumes allocated to future periods. Nuclear volumes increased by 6%, primarily reflecting an extensive outage at Oskarshamn and longer planned outages at Olkiluoto in the comparison period. CHP and condensing power generation remained stable. Heat sales volumes increased by 17%, supported mainly by colder weather at the beginning of the year. The achieved power price was 52.1 EUR/MWh, slightly lower than in the comparison period. The blended spot power price in Fortum’s generation price areas amounted to 61.4 EUR/MWh, compared to 36.3 EUR/MWh in January–September 2025. The positive effect of the higher power price was dampened by a high hedge ratio. Comparable operating profit increased by EUR 86 million, or 13%, to EUR 734 million, impacted mainly by higher spot prices as well as higher nuclear and hydro volumes, partly offset by a high hedge ratio. The result of the district heating business increased, impacted mainly by higher volumes, higher sales prices of power and new electricity-based production assets, partly offset by higher fuel costs and reduced availability in Poland. Operating profit was affected by EUR -24 (-42) million of items affecting comparability. (Note 3) Comparable share of profits of associates and joint ventures totalled EUR -7 (13) million. Fortum Corporation January–September 2026 Interim Report 9
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On 24 June, Fortum announced its decision to end coal-fired power generation in Finland by closing and dismantling its Meri-Pori coal power plant. The closure is part of Fortum’s commitment to exit coal-based energy production by the end of 2027 and reach net zero by 2040. The facility will be permanently closed as of 1 March 2027. The Meri-Pori plant has been reserved for the use of Finland’s National Emergency Supply Agency (NESA) since March 2024. During this period, it has not generated electricity apart from test runs. The plant will be available for production in January and February 2027 before its final closure. The existing power line connected to Meri-Pori plant will remain in place to support future electricity-intensive operations. Consumer Solutions Consumer Solutions is responsible for offering energy solutions to consumers, including small- and medium-sized enterprises, predominantly in the Nordics and Poland. Fortum is the largest energy solutions provider in the Nordics, with over two million customers. The business provides electricity, as well as related value-added and digital services, mainly to retail customers. EUR million III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Reported Sales 745 573 2,833 2,146 3,029 3,716 - power sales 668 494 2,553 1,843 2,607 3,317 - gas sales 64 69 251 279 387 359 - other sales 13 11 29 25 35 39 Operating profit 12 25 78 100 127 105 Capital expenditure and gross investments in shares 18 15 48 63 78 63 Number of employees 1,128 1,139 1,134 EUR million III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Comparable EBITDA 36 46 146 161 213 198 Operating profit 14 23 80 96 122 106 Return on net assets (RONA), % 18.3 14.1 Net assets (at period-end) 843 594 718 Sales volumes TWh III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Electricity 7.0 6.5 25.6 24.1 33.7 35.1 Gas 1.2 1.4 5.0 5.4 7.6 7.3 Number of customers Thousands 1) 30 Sep 2026 30 Sep 2025 31 Dec 2025 Electricity 2,240 2,290 2,250 E-mobility 2) 30 30 30 Gas 40 40 40 Total 2,300 2,360 2,320 1) Rounded to the nearest 10,000. 2) Measured as average monthly paying customers for the quarter. July–September 2026 Electricity sales volume increased by 8%, mainly due to a larger enterprise customer base in both Sweden and Poland. Total sales revenue increased by 30%, thanks to higher electricity prices in the Nordics and a larger electricity sales volume. Comparable operating profit decreased by EUR 9 million, or 39%, to EUR 14 million, mostly due to lower sales margins compared to the extraordinarily strong margins in the comparison period. On 21 August, Fortum launched a recommended voluntary cash tender offer to the shareholders of the Norwegian electricity retail company Elmera Group ASA. The offer was settled after the reporting period on 23 October, with Fortum now holding approximately 91.92% of Elmera’s issued and outstanding share capital and voting rights (96.12% excluding Elmera's treasury shares). Elmera is expected to be consolidated into Fortum Group as part of the Consumer Solutions segment from 31 October 2026. Fortum intends to carry out a compulsory acquisition of the remaining shares and to pursue a delisting of Elmera’s shares from Euronext Oslo Børs. Fortum Corporation January–September 2026 Interim Report 10
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January–September 2026 Electricity sales volume increased by 6%, due to colder weather in the Nordics during the first quarter and a larger customer base in Poland. Gas sales volume decreased by 7%. Total sales revenue increased by 32%, supported by higher electricity and gas prices both in the Nordics and in Poland and a larger electricity sales volume. Comparable operating profit decreased by EUR 16 million, or 17%, to EUR 80 million, mainly due to lower sales margins compared to the strong sales margins in the comparison period and higher fixed costs. Other Operations The Other Operations segment comprises innovation and venturing activities, enabling functions and corporate management. It also includes the remaining Circular Solutions businesses, mainly the battery recycling business. EUR million III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Reported Sales 45 45 133 138 187 183 Operating profit -36 -18 -89 -72 -100 -116 Share of profit/loss of associates and joint ventures -1 0 1 1 0 0 Capital expenditure and gross investments in shares 12 10 22 25 39 36 Number of employees 1,272 1,263 1,278 EUR million III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Comparable EBITDA -29 -13 -73 -55 -71 -89 Operating profit -33 -18 -86 -70 -91 -106 Share of profit/loss of associates and joint ventures -1 0 1 1 0 0 Return on net assets (RONA), % -38.0 -33.0 Net assets 355 246 297 July–September 2026 Comparable operating profit decreased by EUR 15 million, or 83%, and amounted to EUR -33 million, mainly due to higher fixed costs, including certain one-off items. The result of the Circular Solutions businesses was slightly lower than in the comparison period. January–September 2026 Comparable operating profit decreased by EUR 16 million, or 23%, and amounted to EUR -86 million. The result of the Circular Solutions businesses was slightly higher than in the comparison period. Fortum Corporation January–September 2026 Interim Report 11
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Capital expenditures, divestments and investments in shares In July–September 2026, capital expenditures and investments in shares totalled EUR 150 (114) million. Capital expenditures were EUR 139 (104) million (Notes 3 and 6). In January–September 2026, capital expenditures and investments in shares totalled EUR 383 (404) million. Capital expenditures were EUR 362 (340) million (Notes 3 and 6). Fortum expects to start, or has started, power and heat production capacity of new power plants and expects to upgrade its existing plants as follows: Type Electricity capacity, MW Heat capacity, MW Capital expenditure, EUR million Supply starts/started Growth Loviisa, Finland Nuclear Lifetime extension, 38 1,000 Espoo Clean Heat, Finland Espoo and Kirkkonummi Nuijala, Espoo Waste heat utilisation, electrified heating Electric boiler 374 50 300 I/2026 Czestochowa, Poland Biomass Decarbonisation Decarbonisation 100 IV/2026 Zabrze, Poland Biomass, RDF Decarbonisation Decarbonisation 85 IV/2027 Maintenance Hydro projects Hydro 41 Generation Growth capital expenditure On 16 February 2023, the Finnish Government granted a new operating licence until the end of 2050 for both units at Fortum’s Loviisa nuclear power plant. Over the course of the new licence period, the plant is expected to generate up to 180 TWh of electricity. Investments related to the continuation of operations and lifetime extension will amount to an estimated EUR 1 billion during 2023–2050. Individual investment decisions related to the project will be made separately. On 29 May 2024, Fortum announced that it will modernise the Loviisa nuclear power plant’s low-pressure turbines as part of the lifetime extension-related investments. On 9 September 2026, Fortum and Google signed a 22-year nuclear Power Purchase Agreement that provides economic certainty for the lifetime extension and power upgrade of the plant through 2050 by contracting for up to 50% of the plant's capacity. Furthermore, the agreement is expected to enable a new 10 MW power increase of the plant, in addition to the already planned 38 MW uprate which is expected to be live in 2028. The Loviisa power plant is the first nuclear power plant in Finland and has two units: unit 1 started operating in February 1977, and unit 2 in November 1980. The units’ previous operating licences are valid until 2027 and 2030. Fortum supports the City of Espoo in achieving its carbon neutrality goal by 2030 by decarbonising district heat production in the Espoo, Kauniainen and Kirkkonummi areas. This joint programme, Espoo Clean Heat, provides a flagship example of efficient decarbonisation and a large-scale transition to more flexible and self-sufficient heating. Fossil fuels will be mostly replaced by electricity-based heating. Fortum’s total capital expenditure on the Espoo Clean Heat programme amounts to approximately EUR 300 million. To date, Fortum’s investments in the programme have totalled approximately EUR 261 million. Electricity-based heat production has started at three new sites. The Nuijala (Espoo) production plant uses electric boilers and a heat accumulator, and large production plants in Hepokorpi (Espoo) and Kolabacken (Kirkkonummi) host heat pumps, electric boilers and a heat accumulator. Initially, the heat pumps capture heat from ambient air and eventually also waste heat from Microsoft’s large-scale data centres that are currently under construction. Ultimately, waste heat from data centres will cover approximately 40% of the district heat consumption in the area. Once fully operational, the heat production capacity of these three plants will total 424 MW. On 29 October 2024, Fortum announced that it will invest approximately EUR 100 million in the decarbonisation of the Czestochowa combined heat and power (CHP) plant in Poland. The Czestochowa plant’s retrofit with biomass technology will decrease Fortum’s coal capacity by 0.1 GW to 0.9 GW and annual direct CO2 emissions by approximately 175,000 tonnes. The investment will take place over a period from the fourth quarter of 2024 until the fourth quarter of 2026. On 29 October 2025, Fortum announced that it will invest approximately EUR 85 million in the decarbonisation of the Zabrze combined heat and power (CHP) plant in Poland. The Zabrze plant’s retrofit with biomass and refuse-derived fuel (RDF) technology will decrease Fortum’s coal capacity by 0.1 GW to 0.8 GW and annual direct CO2 emissions by approximately 280,000 tonnes. The investment will take place over a period from the fourth quarter of 2025 until the fourth quarter of 2027. Fortum Corporation January–September 2026 Interim Report 12
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Maintenance capital expenditure Fortum continuously maintains and upgrades its hydropower fleet and currently has numerous hydropower plant refurbishment and modernisation projects underway. The resulting capacity increase is estimated to be approximately 41 MW in total by 2031. Other Operations In July 2022, Fortum and GIG (Green Investment Group, a specialist green investor within Macquarie Asset Management) agreed to invest in a new waste-to-energy plant in Glasgow, Scotland, through a 50/50 joint venture. In June 2024, Macquarie Asset Management announced that it had reached an agreement to sell its 50% stake in the plant to Gren Energy. When fully commissioned, the South Clyde Waste-to-Energy plant will have an annual processing capacity of 350,000 tonnes of waste. The plant will have a power generation gross capacity of 45 MWe, corresponding to the average annual electricity consumption of approximately 90,000 homes. The facility is expected to enter commercial operations in the first half of 2027. Operating and regulatory environment European power markets In the third quarter of 2026, Nordic spot prices increased compared to the same period in the previous year. This was primarily attributable to markedly reduced hydro reservoir levels, lower nuclear availability and exceptionally high Continental power prices, which were driven by higher gas prices. Finnish spot prices were a notable outlier, declining year-on-year due to expanded transmission capacity from northern Sweden through the Aurora transmission line. Nordic power demand was marginally above the five-year average, as well as slightly ahead of levels in the third quarter of 2025. Low hydro inflows, caused by the previous winter's substantial snow deficit, deepened the Nordic reservoir deficit from a moderate gap (-5 TWh) at the beginning of the quarter to a considerable deficit (-13 TWh) by the end of it. During July, below-normal energy precipitation, together with weak inflows, caused the Nordic reservoir balance to decline sharply. Lower Nordic nuclear availability and escalating gas prices, influenced by the US-Iran tension escalations during August and September, resulted in a rapid increase in both Nordic spot and futures prices. During the third quarter, the average Nordic system price in Nord Pool was 74.4 (36.0) EUR/MWh. The average area price in Finland was 37.7 (40.4) EUR/MWh. In Sweden, the average price in SE3 (Stockholm) was 62.0 (41.3) EUR/MWh, while SE2 (Sundsvall) averaged 33.7 (16.6) EUR/MWh. In Germany, the average spot price in the third quarter was 125.5 (82.8) EUR/MWh. In January–September, the average system spot price in Nord Pool was 77.5 (36.0) EUR/MWh. The average area price in Finland was 59.7 (39.2) EUR/MWh. In Sweden, the average area price in the SE3 area (Stockholm) was 70.8 (43.0) EUR/MWh, and the price in the SE2 area (Sundsvall) was 45.8 (13.9) EUR/MWh. In Germany, the average spot price in January–September was 107.7 (88.0) EUR/MWh. At the beginning of the year, electricity prices in Finland and the SE3 area in Sweden exceeded German price levels but eased in March relative to Germany as Nordic weather conditions turned milder. According to preliminary statistics, Nordic power consumption in the third quarter amounted to 85 (84) TWh. Both industrial and non- industrial power demand across the Nordics largely held steady, with Norwegian industrial demand increasing marginally and Finnish non-industrial demand showing some improvement. During January–September, power consumption in the Nordics increased to 297 (288) TWh. In Central Western Europe (Germany, France, Austria, Switzerland, Belgium and the Netherlands), power consumption in the t h i r d q u a r t e r t o t a l l e d 3 0 4 ( 2 9 9 ) T W h . W h i l e d e m a n d w a s s l i g h t l y a b o v e t h e f i v e ‑ y e a r a v e r a g e a n d J u l y s a w a s u r g e i n d e m a n d d r i v e n b y a s u s t a i n e d h e a t w a v e , t h e p o s t ‑ e n e r g y ‑ c r i s i s r e c o v e r y r e m a i n e d s l u g g i s h . O v e r a l l p o w e r c o n s u m p t i o n r e m a i n e d a p p r o x i m a t e l y 4 0 T W h b e l o w p r e ‑ c r i s i s l e v e l s . D u r i n g J a n u a r y – S e p t e m b e r , p o w e r c o n s u m p t i o n i n C e n t r a l W e s t e r n E u r o p e w a s 9 7 0 ( 9 5 8 ) T W h . A t t h e s t a r t o f t h e t h i r d q u a r t e r , N o r d i c h y d r o r e s e r v o i r l e v e l s s t o o d a t a p p r o x i m a t e l y 7 9 T W h , a r o u n d 5 T W h b e l o w t h e l o n g ‑ t e r m a v e r a g e and 10 TWh below the level a year earlier. During the quarter, hydro inflows were below normal. Hydro generation was slightly below the long-term average. By the end of the quarter, reservoir levels had increased to around 88 TWh, corresponding to a deficit of 13 TWh r e l a t i v e t o t h e l o n g ‑ t e r m a v e r a g e a n d 1 2 T W h b e l o w t h e l e v e l o n e y e a r a g o . In late October, the Nordic system forward price on Euronext for the remainder of 2026 was around 116 EUR/MWh and for 2027 around 7 4 E U R / M W h . N o r d i c h y d r o r e s e r v o i r s s t o o d a t a p p r o x i m a t e l y 9 0 T W h , a r o u n d 1 1 T W h b e l o w t h e l o n g ‑ t e r m a v e r a g e a n d 1 2 T W h b e l o w y e a r ‑ a g o l e v e l s . T h e G e r m a n e l e c t r i c i t y f o r w a r d p r i c e f o r t h e r e m a i n d e r o f 2 0 2 6 w a s a r o u n d 1 9 5 E U R / M W h a n d f o r 2 0 2 7 a r o u n d 1 5 0 E U R / MWh. Fortum Corporation January–September 2026 Interim Report 13
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European commodity markets In the third quarter, natural gas prices increased sharply, in the wake of the breakdown of the June interim ceasefire agreement in the Middle East. With LNG flows and Strait of Hormuz shipping activity still running below pre-conflict levels, the European gas markets were left in a tight position ahead of the winter period. Low storage inventories and ongoing uncertainty surrounding the pace of supply normalisation supported a persistent geopolitical risk premium, keeping gas forward curves at elevated levels. Oil prices similarly remained highly sensitive to developments in the Middle East, though having stabilised at levels below the peaks recorded at the beginning of the conflict. Gas consumption in Central Western Europe totalled 233 TWh during the third quarter. Over the same period, regional gas storage levels increased but remained low for the season. Gas storage volumes rose from 257 TWh at the start of the quarter to 405 TWh by q u a r t e r ‑ e n d . T h i s w a s 9 7 T W h l o w e r t h a n i n t h e s a m e p e r i o d l a s t y e a r a n d 1 3 6 T W h b e l o w t h e f i v e ‑ y e a r a v e r a g e (2021–2025). T h e a v e r a g e T T F f r o n t ‑ m o n t h g a s p r i c e i n t h e t h i r d q u a r t e r w a s 6 3 . 7 E U R / M W h a n d 5 0 . 0 E U R / M W h d u r i n g J a n u a r y–September. The 2027 g a s f o r w a r d p r i c e i n c r e a s e d f r o m 3 4 . 9 E U R / M W h a t t h e s t a r t o f t h e q u a r t e r t o 5 6 . 8 E U R / M W h a t q u a r t e r ‑ e n d , r e m a i n i n g 2 7 . 7 E U R / M W h above the level observed one year earlier. EU Allowance (EUA) prices increased during the quarter from 80.2 EUR/tonne to 85.1 EUR/tonne, which was 9.4 EUR/tonne higher than one year earlier. Coal prices increased over the quarter. The ICE Rotterdam 2027 forward contract rose from 110.7 USD/tonne at the start of the quarter to 1 3 6 . 1 U S D / t o n n e b y q u a r t e r ‑ e n d , 2 9 . 6 U S D / t o n n e h i g h e r y e a r ‑ o n ‑ y e a r . In late October, the TTF gas forward price for the remainder of 2026 was approximately 93 EUR/MWh. The corresponding EUA forward price for 2026 traded around 86 EUR/tonne, while the ICE Rotterdam coal forward price for the remainder of 2026 stood at approximately 149 USD/tonne. Regulatory environment The Commission proposed an EU data centre sustainability label scheme On 21 September, the European Commission proposed a sustainability rating scheme for data centres, supporting its ambition to triple EU capacity within five to seven years, while improving transparency on energy and water use. The delegated regulation is still subject to a two-month scrutiny period by the European Parliament and Council before entering into force. From August 2027, public ratings will apply to operating facilities with installed IT power demand above 500 kW. The criteria include energy and water efficiency, electricity sourcing, grid flexibility, waste heat reuse and contributions to new clean generation. The scheme recognises nuclear and renewables, including hydropower, in parallel and should support demand for clean power purchase agreements and guarantees of origin. It also highlights data centres’ role in system flexibility and district heating. For Fortum, this creates opportunities in low-carbon electricity supply, PPAs, guarantees of origin, flexibility services and waste heat solutions, while strengthening the Nordics’ appeal for data centre investment. Swedish parliamentary election result and impact on energy policy Following the Swedish parliamentary election in September 2026, the political landscape remains fragmented as the centre-left bloc secured only a slim majority of 176 to 173 seats in the parliament. Discussions to form a new government are ongoing. Official election results indicate that broad political support may be required for major legislative initiatives. For the energy sector, the outcome is expected to increase the importance of cross-party cooperation on issues such as electrification, energy security, industrial competitiveness, and low-carbon power generation. Policy development may rely more heavily on inquiries, committees, and negotiated solutions, potentially extending decision-making timelines. The election outcome is not expected to have any immediate impact on Fortum. However, continued monitoring of developments related to nuclear energy, renewable energy, grid expansion, flexibility, and electrification remains important, as the new political agenda takes shape. Legislation on prioritisation of grid connection under development in Finland The Finnish Government has proposed a new grid connection prioritisation framework as part of an amendment to the Electricity Market Act. The proposal is a response to the intensified public debate around data centres, electricity prices and the allocation of scarce grid capacity. Fortum Corporation January–September 2026 Interim Report 14
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Fortum has submitted a statement on the draft by the Ministry of Economic Affairs and Employment and actively engages in the legislative process. The legislation is planned to take effect on 1 January 2027. Fortum considers that the proposed framework risks undermining investments, electrification and Finland’s competitiveness, while offering limited benefits to the electricity system. Grid connection prioritisation should remain a last-resort, technology-neutral and non- discriminatory measure focused on efficient network use and advancing mature projects, with broader electricity market challenges addressed through separate market-based solutions and a thorough impact assessment conducted before adoption. Key drivers and risks Fortum’s operations are exposed to a number of financial, operational, strategic and sustainability-related risks. Fortum is exposed to these risks both directly and indirectly through its subsidiaries, associated companies and joint ventures. The principal associated companies and joint ventures are Teollisuuden Voima Oyj, Forsmarks Kraftgrupp AB, OKG AB and Kemijoki Oy. For more information, see Fortum’s Financial Statements 2025. One of the key objectives in Fortum’s strategy is to reduce the Group’s strategic business risks. The Nordic power price exposure remains the single largest key driver and financial risk for Fortum, as Fortum's main generation assets are located in the Nordics. It is a key priority for Fortum to mitigate this market risk, including managing the related credit and liquidity risks from hedging this exposure. The main strategic risks relate to the development of the business and/or regulatory environment in ways that have not been foreseen and prepared for. The current geopolitical and economic uncertainty continues to pose material operational and business risks for Fortum as the owner and operator of power and heat generation in the Nordics and Poland. Future energy market, regulatory and climate scenarios, as well as scenarios for how the current geopolitical situation develops, including the impact of these on Fortum’s existing and potential new businesses, are regularly updated and used in the development of the strategy. Sustainability-related risks, including exposure to climate change, continue to be a focus area for Fortum, and Fortum is well positioned with the existing portfolio of largely low-carbon power generation to take advantage of opportunities in the green energy transition. Business operating environment Fortum operates in a global business environment, with a main operational focus in the Nordics, and is therefore exposed to political and other risks that affect the macroeconomic development and consumer behaviour in Fortum’s markets. The global landscape has experienced a further escalation of conflict and increasing geopolitical uncertainty. Several regional disputes have worsened, increasing instability and insecurity in energy-producing regions, potentially disrupting energy supply chains and raising concerns about energy security. A further escalation of the war in Ukraine may increase the risk of hostile actions by the Russian Federation against foreign companies. This could have severe implications, such as an increased risk of sabotage, including direct physical or cyber-attacks on, for example, energy infrastructure in Fortum’s operating countries. The escalation of the conflict in the Middle East has underscored the differing exposure of European power markets to geopolitical shocks. While such events quickly drive gas, coal, and power prices up in more fossil-fuel-dependent systems, the largely decarbonised Nordic power market is structurally less exposed. However, prolonged tensions and persistently high fuel prices could still weaken Europe’s macroeconomic environment, increase uncertainty, and weigh on growth and investment sentiment in the Nordics. Regulatory environment The energy sector is heavily influenced by national and EU-level energy and climate policies and regulations. The overall complexity and possible regulatory changes in Fortum’s operating countries pose risks and create opportunities for the generation and consumer businesses. Fortum analyses and assesses a number of future market and regulatory scenarios, including the impact of these on different generation forms and technologies, as part of its strategy. Fortum maintains an active dialogue with different policymakers and legislators involved in the development of laws, policies and regulations in order to manage these risks and to proactively contribute to the development of the energy and climate policy and regulatory framework in line with Fortum’s strategic objectives. Nordic power price exposure and related risks The earnings capability and profitability of Fortum’s outright power generation, such as hydro, nuclear and wind power generation, are primarily exposed to fluctuations in the Nordic power prices. In the Nordics, power prices exhibit significant short- and long-term variations on the back of several factors, including, but not limited to, weather conditions, outage patterns in production and transmission lines, CO₂ emission allowance prices, commodity prices, energy mix and the supply-demand balance. An economic downturn, lower commodity prices, warm weather or wet hydrology could lead to significantly lower Nordic power prices, which would negatively impact earnings from Fortum’s outright power production. The increased geopolitical uncertainty and fears of escalation of other conflicts may Fortum Corporation January–September 2026 Interim Report 15
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impact power and other commodity prices and volatility, especially in case of disturbances to other sources of power or gas supply. In general, price volatility is expected to continue also with the increasing share of intermittent generation and the occasionally re-emerging concerns over security of energy supply. This also increases the risk of further political market interventions going forward. Fortum hedges its exposure to commodity market prices in order to improve predictability of future results by reducing volatility in earnings, while ensuring that there is sufficient cash flow and liquidity to cover financial commitments. Long-term contractual power sales arrangements reduce exposure to market power price fluctuations and improve the predictability of future cash flows. At the same time, their long duration may increase counterparty concentration and replacement risks. Such arrangements may also reduce flexibility to respond to changes in market conditions, regulation or the generation portfolio and, where collateral or other credit-support provisions apply, may affect liquidity requirements. Fortum manages these risks through contractual structuring, counterparty credit risk management and ongoing monitoring of the related financial exposures. Fortum’s business is exposed to liquidity and refinancing risks primarily through the need to finance its business operations, including margining payments and collaterals issued for hedging activities. Higher and more volatile commodity prices increase the net margining payments toward clearing houses and clearing banks. Fortum mitigates this risk by entering into over-the-counter (OTC) derivatives contracts directly with bilateral counterparties without margining requirements. Consequently, credit exposure from hedges with OTC counterparties has increased. Due to Fortum’s net short position in Nordic power hedges, the credit exposure would increase in line with the value of hedges if Nordic power prices decrease. OTC trading also exposes the Group to liquidity risk in case of a counterparty default. A default could trigger a termination payment in cases where the net market value of bilateral contracts is positive for the counterparty. Fortum's objective is to maintain a solid investment-grade rating of at least BBB. A downgrade in the credit ratings, in particular to below investment-grade level (BB+ or below), could trigger counterparties’ rights to demand additional cash or non-cash collateral. A possible downgrade to below investment-grade level would affect access to the capital markets and increase the cost of new financing. The current long-term credit rating for Fortum by S&P Global Ratings and Fitch Ratings is BBB+ with Stable Outlook. Fortum continues to constantly monitor all rating-related developments and to regularly exchange information with the rating agencies. Operational risks Fortum’s business activities include energy generation, storage and control of operations, as well as the construction, modernisation, maintenance and decommissioning of power plants or other energy-related industrial facilities. Any unwanted operational event (which could be caused by, e.g., technical failure, human or process error, natural disaster, sabotage, failure of key suppliers, or terrorist attack) can endanger personal safety or lead to environmental or physical damage, business interruptions, project delays and possible third- party liability. The associated costs can be high, especially in Fortum’s largest units and projects. Climate change Fortum believes that the growing awareness and concern about climate change will increase the demand for low-carbon and resource- and energy-efficient energy products and services. The company is leveraging its know-how in hydro, nuclear, wind and solar power by offering its customers low-carbon energy solutions. The electrification of energy-intensive industry, services and transportation is likely to increase the consumption of low-carbon electricity in particular. The development of the hydrogen economy, and especially renewable hydrogen produced with renewable power, will potentially offer future business opportunities for Fortum. Driving the transition to a low-carbon economy is therefore an integral part of Fortum’s strategy. Fortum’s strategy includes ambitious sustainability and decarbonisation targets. However, the transition to a low-carbon economy poses a number of strategic and operative risks related to changes in energy and climate policy and regulation, technology development and the business environment in which Fortum operates. Fortum’s operations are exposed to the physical risks caused by climate change, including changes in weather patterns that could alter energy production volumes and energy demand. Fluctuating precipitation, flooding and extreme temperatures may affect, e.g., hydropower generation, dam safety, availability of cooling water, and the price and availability of biofuels. Hydrological conditions, precipitation, temperatures, and wind conditions also affect the short-term electricity price in the Nordic power market. In addition to climate change mitigation, we also aim to adapt our operations, and we take climate change into consideration in, among other things, the assessment of growth projects and investments, as well as in operation and maintenance planning. Fortum identifies and assesses its assets’ resilience towards different acute and chronic physical climate-related risks within different Intergovernmental Panel on Climate Change (IPCC) climate scenarios and creates adaptation plans for the most material risks. Fortum Corporation January–September 2026 Interim Report 16
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Outlook In the near term, the operating environment is impacted by strong geopolitical tensions, which cause uncertainty and turbulence in the general economic outlook and may affect international production chains and commodity markets. Geopolitical risks, heightened uncertainty and reduced visibility may pose challenges to major industrial investments in the Nordics. In the long term, electricity is expected to gain a significantly larger share of total energy consumption. The electricity demand growth rate will be influenced by factors such as macroeconomic and demographic development, improved energy efficiency, and decarbonisation through direct electrification of energy-intensive sectors, including various industries, data centres, transport, and heating and cooling, and, in the longer term, by green hydrogen. Hedging At the end of September, approximately 80% of the Generation segment’s estimated Nordic power sales volume was hedged at EUR 43/ MWh for the remainder of 2026, approximately 70% at EUR 42/MWh for 2027 (30 Jun 2026: 65% at 41 EUR/MWh) and approximately 45% at EUR 42/MWh for 2028. Fortum’s hedge ratios and prices comprise its outright nuclear, hydro and wind generation volumes. The reported hedge ratios are based on hedges and power generation forecasts of the Generation segment. In November 2025, Fortum set a strategic target to have a hedged share of rolling 10-year outright generation volume of more than 25% by the end of 2028. The achievement of this target is updated once a year in connection with the Group’s full-year results. At the end of 2025, the hedged share of the rolling 10-year outright generation volume was approximately 19%. The reported hedge ratios may vary significantly, depending on Fortum’s actions on the electricity derivatives markets. Hedges are mainly financial contracts, most of which are electricity derivatives quoted on the power futures exchange and traded either on the futures exchange or with bilateral counterparties. As an additional liquidity risk mitigation measure, Fortum is mainly hedging with bilateral agreements, and the exposure on the futures exchange is clearly lower. Fortum continues to utilise dual channels for its hedging: bilateral contracts / PPAs and trading on the futures exchange, depending on market liquidity and financial optimisation. Generation The Generation segment’s achieved Nordic power price typically depends on factors such as hedge ratios, hedge prices, spot prices, availability and utilisation of Fortum’s flexible generation portfolio, as well as currency fluctuations. The annual outright portfolio of hydro, nuclear and wind generation amounts to approximately 47 TWh. In 2025, Fortum's total outright generation volume amounted to 41.6 TWh. In 2026, nuclear generation volumes are expected to be approximately 23.0 TWh. The split of Fortum’s blended price based on its price area exposure of the normalised outright generation portfolio is approximately: Finland 46%, Sweden SE3 37% and Sweden SE2 17%. The volumes depend on various criteria, such as outages, hydrology and other market dynamics. Excluding potential effects from changes in the power generation mix, a 1 EUR/MWh change in the Generation segment’s achieved Nordic power price will result in an approximately EUR 47 million change in the segment’s annual comparable operating profit (assuming annual generation volumes on a normal level). Fortum’s achieved power price includes operations in the physical and financial commodity markets, as well as the optimisation premium of Fortum’s outright generation portfolio. For 2026, the annual optimisation premium included in the achieved power price for the whole outright portfolio is estimated to be approximately 8–10 EUR/MWh. For 2027 and beyond, the guidance is 6–8 EUR/MWh. The optimisation premium depends on overall market conditions, level of volatility, and market prices for electricity and environmental value products. In 2025, Fortum's optimisation premium was 9.7 EUR/MWh. The annual property tax in Sweden increased by approximately EUR 30 million starting from the year 2025. The new run-rate of approximately EUR 45 million is effective until the end of 2030, part of which is recorded as cost for power purchase of generation. Efficiency improvements Fortum expects its comparable operating profit to improve by EUR 330 million by 2030 compared to the base line of EUR 930 million. This improvement is based on own actions, for example improved fleet availabilities, efficiency improvements and organic growth. The improvement does not include impacts from capital expenditure, M&A or power price changes. Fortum Corporation January–September 2026 Interim Report 17
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Income taxation The comparable effective income tax rate for Fortum is estimated to be in the range of 18–20% for 2026. Fortum’s comparable effective tax rate is impacted by the weight of the comparable profit in different jurisdictions and differences in standard nominal tax rates in these jurisdictions. The tax rate guidance excludes items affecting comparability. Capital expenditure For the period of 2026–2030, Fortum’s committed capital expenditure is expected to be approximately EUR 2.0 billion, excluding acquisitions. This includes growth capex of approximately EUR 750 million in total and maintenance capex of approximately EUR 250 million per year. For 2026, the total committed capital expenditure is expected to be approximately EUR 550 million, excluding acquisitions. Sustainability Sustainability key performance indicators for both environmental and social sustainability are presented in this interim report. Sustainability information based on the double materiality assessment is disclosed annually in the sustainability statement, prepared in accordance with the European Sustainability Reporting Standards (ESRS) of the Corporate Sustainability Reporting Directive (CSRD). Additionally, Fortum annually reports on its sustainability-related financial information, including climate-related disclosures, referencing to the requirements of the International Financial Reporting Standards' (IFRS) sustainability disclosure standards S1 (General requirements for disclosure of sustainability-related financial information) and S2 (Climate-related disclosures). Environmental sustainability In this interim report, Fortum’s targets and key performance indicators for environmental sustainability focus on greenhouse gas (GHG) emissions, biodiversity, and major environmental incidents. 100% of Fortum's production sites are certified according to the ISO 14001 standard for environmental management systems. Fortum's transition plan for climate change mitigation includes the decarbonisation of own operations and the value chain. Fortum prioritises direct emission reductions, and residual emissions will be neutralised in line with the international Science Based Targets initiative (SBTi) criteria to reach net-zero emissions. SBTi has approved Fortum’s near- and long-term science-based emission reduction targets and its science-based net-zero target by 2040. The targets align with the level of emission reduction needed to limit global warming to 1.5°C. Fortum’s commitment to SBTi targets marks a significant milestone on its sustainability journey, being central to the company’s strategy and a vital part of its execution. SBTi-verified near- and long-term climate targets are: • Reach net-zero GHG emissions across the value chain by 2040. • Reduce Scope 1 and 2 GHG emissions by 85% per MWh by 2030 and by 90% per MWh by 2040 from base year 20231). • Reduce Scope 1 and 3 GHG emissions from fuel- and energy-related activities covering all sold electricity by 69% per MWh by 2030 and by 94% per MWh by 2040 from base year 20231). • Reduce absolute Scope 3 GHG emissions from the use of sold products for sold fossil fuels by 55% by 2033 and by 90% by 2040 from base year 2023. • Reduce absolute Scope 3 GHG emissions from fuel- and energy-related activities by 90% by 2040 from base year 2023. 1) The SBTi target boundary includes land-related emissions and removals from bioenergy feedstocks. Fortum’s other climate targets are: • Coal exit in the company’s own operations by the end of 2027. • Specific emissions at below 20 g CO2/kWh for total energy production and below 10 g CO2/kWh for power generation by 2028. The transition plan for climate change mitigation is included in Fortum's annual sustainability statement and available on Fortum's website. Fortum Corporation January–September 2026 Interim Report 18
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Group performance, environmental sustainability III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Emissions Direct CO2 emissions, Mt 0.1 0.1 0.6 0.5 0.7 0.8 Specific CO2 emissions from total energy production, gCO2/kWh 5 9 16 15 16 16 Specific CO2 emissions from power generation, gCO2/kWh 3 6 8 8 8 8 Emissions subject to ETS, Mt 0.1 0.1 0.6 0.5 0.7 0.8 Other Major environmental incidents, no. 0 0 0 0 0 0 Power generation, TWh 9.8 9.1 32.3 30.4 42.3 44.2 Share of power generation from renewable and nuclear sources, % 1) 99 99 99 99 99 99 Heat and steam production, TWh 0.4 0.3 2.6 2.1 3.2 3.7 Share of heat and steam production from fossil-free sources and waste heat, % 2) 85 81 64 62 60 62 Coal-based capacity, GW 1.0 1.0 1.0 1.0 1.0 Coal-based power generation capacity, GW 0.7 0.7 0.7 0.7 0.7 Coal-based heat production capacity, GW 0.4 0.4 0.4 0.4 0.4 Coal-based power and heat production, TWh 0.1 0.1 0.7 0.7 1.1 1.1 Coal-based power generation, TWh 0.0 0.0 0.2 0.2 0.3 0.3 Coal-based heat production, TWh 0.0 0.0 0.5 0.5 0.7 0.8 Share of coal of sales, % 1 1 2 2 2 2 Share of fossil fuels of production-based sales, % 3 4 6 5 6 6 Share of fossil fuels of sales, % 9 11 12 13 13 12 1) Renewable sources include mostly hydropower as well as wind power and bio-based fuels. 2) Fossil-free sources include renewable or nuclear electricity (bundled with Guarantees of Origin), heat from the ambient air, as well as bio-based fuels. The 2025 comparative, first reported in I/2026 as 64%, was adjusted in II/2026 to 60%. On 24 June, Fortum announced that it has decided to close and dismantle its Meri-Pori coal power plant in Finland, reducing coal-based power generation capacity by 0.6 GW. Electricity generation at the plant will end, and the facility will be permanently closed as of 1 March 2027. The Meri-Pori plant has been reserved for the use of Finland’s National Emergency Supply Agency (NESA) since March 2024. During this period, it has not generated electricity apart from test runs. The agreement with NESA will end at the close of 2026, after which the plant will return to the electricity market for the winter period in January and February 2027 before its final closure. Fortum's biodiversity transition plan outlines interim targets and concrete actions for the coming years for each biodiversity target. Targets cover the impacts of hydropower on aquatic ecosystems, land use change in Fortum’s own operations and the impact of biomass sourcing on land use (supply chain impact). The impacts of climate change pressure are addressed through Fortum’s SBTi targets. Fortum's biodiversity targets are: • Increase the ecological value in river stretches where actions have the most ecological benefit, by 2040. • Achieve a net positive impact on land use for our own operations from 2030 onwards. • No increase in land use negative impact from procured biomass in existing operations from 2024 levels. Fortum's main terrestrial biodiversity impacts are related to the impacts from GHG emissions, land use and fuel procurement. Terrestrial impacts have been identified with a Biodiversity Footprint Assessment (BFA, by Global Biodiversity Score® tool). In January–September 2026, Fortum continued to implement both voluntary and licence-related biodiversity measures in its hydropower operations to mitigate negative impacts and, where possible, to introduce improvement measures. The key results from Fortum’s terrestrial Biodiversity Footprint Assessment (BFA 2025, with GBS® tool) and Biodiversity transition plan, as well as information containing ongoing and planned voluntary biodiversity-related measures are available on Fortum's website. The website describes Fortum’s goals, responsibilities, timelines and partners for local-scale biodiversity projects. Major environmental incidents are monitored, reported, and investigated, and remedial actions are taken. These incidents are defined as those causing significant harm to the environment (air, water or soil) or resulting in environmental non-compliance with legal or regulatory requirements. Fortum's target is to have no major environmental incidents and no major non-compliance cases. There were no major environmental incidents in January–September 2026 (I-III/2025: 0). Social sustainability In this interim report, Fortum’s targets and key performance indicators for social sustainability focus on occupational safety and employee health and wellbeing. Fortum strives to provide a safe workplace for all employees, contractors, and service providers. Fortum has implemented a certified ISO 45001 safety management system that covers 100% of Fortum’s production sites. Fortum Corporation January–September 2026 Interim Report 19
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Fortum’s safety targets are: • 75% execution rate for Safety improvement plans in 2026. • Total Recordable Injury Frequency (TRIF) for own personnel and contractors to be below 1.0 by the end of 2030. • No severe injuries. Group performance, social sustainability III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Total Recordable Injury Frequency (TRIF), own personnel and contractors, injuries per million working hours 3.4 4.3 2.2 2.9 2.4 1.8 Severe injuries, no. 0 0 1 0 1 2 Total recordable injury frequency decreased in January-September compared to the corresponding period last year. In the first quarter, one injury to a contractor’s employee was classified as severe. Fortum’s goal for workplace wellbeing activities is to promote the health and occupational safety of its employees, as well as the functionality of the work community. To monitor this, Fortum conducts a biannual employee survey to measure its employees' perceptions on health and wellbeing and to assess Fortum's efforts in supporting employees' mental, physical and social wellbeing. Fortum’s April 2026 health and wellbeing score was 8.1, exceeding the energy and utility sector peer benchmark of 8.0. Fortum expects its business partners to act responsibly and to comply with the requirements set forth in the Code of Conduct and the Supplier Code of Conduct. Fortum assesses the performance of its business partners with supplier qualifications, supplier audits and a Know Your Counterparty (KYC) process. Fortum continuously develops its supplier evaluation and supply chain due diligence process. Fortum collaborates with communities and organisations at global, national and local levels through the Corporate Social Responsibility (CSR) programme. This programme aims to foster impactful collaboration on environmental topics (focus on climate change, biodiversity and water) as well as social topics (focus on education, climate change adaptation and equality). In January–September, Fortum supported several organisations through its CSR programme, among others; Save the Children, World Food Programme (WFP), John Nurminen Foundation and Engineers without Borders. ESG ratings and recognitions Fortum actively participates in the following ESG assessment schemes: ESG Rating Fortum's score Maximum score Latest assessment CDP Climate Change A A December 2025 CDP Supplier Engagement A A April 2026 MSCI ESG Ratings AA AAA March 2026 ISS ESG Corporate Rating B- (Prime) A+ September 2026 In addition, Fortum is listed on the Nasdaq Helsinki stock exchange and is included in the OMX Sustainability Finland and ECPI® indices. Group personnel Fortum’s operations are mainly based in the Nordic countries. The total number of employees at the end of September 2026 was 4,654 (31 Dec 2025: 4,551). At the end of September 2026, the Generation segment had 2,254 (31 Dec 2025: 2,139) employees, the Consumer Solutions segment 1,128 (31 Dec 2025: 1,134), and the Other Operations segment 1,272 (31 Dec 2025: 1,278). Legal actions There were no major developments in the ongoing legal actions during the third quarter of 2026. For further information on legal actions, see Note 16. Fortum Corporation January–September 2026 Interim Report 20
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Shares and share capital Fortum shares on Nasdaq Helsinki January–September 2026 No. of shares traded Total value EUR High EUR Low EUR Average EUR 1) Last EUR FORTUM 237,956,620 4,945,530,158 25.84 18.10 20.79 23.71 1) Volume-weighted average. 30 September 2026 30 September 2025 Market capitalisation, EUR billion 21.3 14.5 Number of shareholders 196,174 217,024 Finnish State holding, % 51.3 51.3 Nominee registrations and direct foreign shareholders, % 25.7 23.3 Households, % 11.7 13.3 Financial and insurance corporations, % 2.1 2.4 Other Finnish investors, % 9.3 9.4 In addition to Nasdaq Helsinki, Fortum shares were traded on several alternative marketplaces, for example Boat, Cboe and Turquoise, and on the OTC market. In January–September 2026, approximately 72% of Fortum’s shares were traded on markets other than Nasdaq Helsinki (source: Bloomberg). On 30 September 2026, Fortum Corporation’s share capital was EUR 3,046,185,953 and the total number of registered shares was 897,264,465. Fortum Corporation does not hold any of the company’s own shares. Board authorisations The AGM 2026 authorised the Board of Directors to decide on a contribution in the total maximum amount of EUR 1,500,000 to Aalto University for the purpose of establishment of a full-time endowed professorship in the energy strategy area. In April 2026, the Board of Directors resolved to make the contribution of EUR 1,500,000, which will be paid in five equal annual instalments of EUR 300,000 during 2026–2030. The Annual General Meeting further authorised the Board of Directors to decide on contributions in the total maximum amount of EUR 500,000 for charitable or similar purposes, and in addition, a total maximum amount of EUR 1,000,000 for incidental emergency relief or similar purposes as needed, and to decide on the recipients, purposes and other terms of the contributions. The authorisations will be effective until the next Annual General Meeting. As of 27 October 2026, EUR 190,000 of the authorisation for charitable or similar purposes and EUR 200,000 for incidental emergency relief or similar purposes was used. Events after the balance sheet date On 2 October, Fortum announced that it had received acceptances from the shareholders of Elmera Group ASA for 91.61% of the issued and outstanding share capital and voting rights of Elmera (95.80% excluding treasury shares) under the previously launched recommended voluntary cash tender offer. On 23 October, Fortum announced that it had settled the voluntary cash tender offer for all issued and outstanding shares in Elmera Group ASA, except for shares owned by Elmera, for NOK 47 per share, corresponding to a total consideration of approximately EUR 463 million (NOK 4,940 million). Following settlement of the offer, Fortum has acquired control and holds 105,108,968 shares, representing approximately 91.92% of Elmera’s issued and outstanding share capital and voting rights (96.12% excluding Elmera's treasury shares). Elmera is expected to be consolidated into Fortum Group and included in the Consumer Solutions segment from 31 October 2026. Fortum will provide further details on Elmera’s consolidation, including the purchase price allocation, in the Financial Statements Bulletin for 2026. Following completion of the offer, Fortum intends to carry out a compulsory acquisition of the remaining shares not owned by Fortum or Elmera, which is expected to be completed in the coming weeks. Following the compulsory acquisition, Fortum intends to pursue a delisting of Elmera’s shares from Euronext Oslo Børs. Espoo, 27 October 2026 Fortum Corporation Board of Directors Fortum Corporation January–September 2026 Interim Report 21
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Further information Investor Relations and Financial Communications: Ingela Ulfves, tel. +358 40 515 1531, Rauno Tiihonen, tel. +358 10 453 6150, Emilia Rannanniemi, tel. +358 40 731 4607, Pirjo Lifländer, tel. +358 40 643 3317, and investors@fortum.com M e d i a : F o r t u m N e w s D e s k , t e l . + 3 5 8 4 0 1 9 8 2 8 4 3 The Interim Report has been prepared in accordance with International Accounting Standard (IAS) 34, Interim Financial Reporting, as adopted by the EU. The interim financials are unaudited. Financial calendar Fortum Corporation’s Financial Statements Bulletin for the year 2026 will be published on 2 February 2027 at approximately 9:00 EET. Fortum’s Financial Statements and Operating and Financial Review for 2026 will be published during week 6, starting on 8 February 2027, at the latest. Fortum will publish three interim reports in 2027: • January−March on 28 April 2027 at approximately 9:00 EEST • January−June on 20 July 2027 at approximately 9:00 EEST • January−September on 27 October 2027 at approximately 9:00 EEST Fortum Annual General Meeting 2027 is planned to be held on 31 March 2027. The Board of Directors will summon the Annual General Meeting and publish the dates related to a possible dividend at a later date. Distribution: Nasdaq Helsinki Key media www.fortum.com More information, including detailed quarterly information, is available at fortum.com/investors. Fortum Corporation January–September 2026 Interim Report 22
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INTERIM FINANCIAL STATEMENTS Interim Financial Statements are unaudited. Condensed consolidated income statement EUR million Note III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Sales 3 1,114 929 4,229 3,545 4,989 5,673 Other income 8 4 20 16 24 28 Materials and services -722 -553 -2,636 -2,043 -2,901 -3,494 Employee benefits -101 -98 -322 -304 -419 -436 Depreciation and amortisation 3 -80 -78 -239 -230 -315 -324 Other expenses -117 -109 -324 -311 -454 -467 Comparable operating profit 3 102 97 729 674 924 979 Items affecting comparability 3, 4 -30 -36 -30 -40 15 25 Operating profit 3 72 60 699 634 939 1,004 Share of profit of associates and joint ventures 3, 7 -20 9 24 45 56 34 Interest expense -30 -38 -92 -121 -157 -128 Interest income 19 24 58 87 111 82 Other financial items - net 4 3 7 -10 -13 4 Finance costs - net 8 -7 -11 -27 -44 -59 -42 Profit before income tax 45 58 696 636 936 996 Income tax expense 9 -17 -7 -135 -117 -173 -191 Net profit 28 51 561 519 763 805 Attributable to: Owners of the parent 31 52 561 520 765 807 Non-controlling interests -3 -1 0 -1 -2 -1 Earnings per share for profit attributable to the equity owners of the company (EUR per share) Basic 0.04 0.06 0.63 0.58 0.85 0.90 As Fortum currently has no dilutive instruments outstanding, diluted earnings per share is the same as basic earnings per share. EUR million Note III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Comparable operating profit 102 97 729 674 924 979 Impairment charges and reversals 0 0 0 -21 -25 -4 Capital gains and other related items -2 0 0 -3 -4 -1 Changes in fair values of derivatives hedging future cash flow -26 -37 -28 -14 47 32 Other -1 0 -1 -2 -3 -3 Items affecting comparability 3, 4 -30 -36 -30 -40 15 25 Operating profit 72 60 699 634 939 1,004 See Note 19 Definitions and reconciliations of key figures. Fortum Corporation January–September 2026 Interim Report 23
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Condensed consolidated statement of comprehensive income EUR million III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Net profit 28 51 561 519 763 805 Other comprehensive income Items that may be reclassified to profit or loss in subsequent periods: Cash flow hedges Fair value gains/losses 1) -333 -301 -633 -321 -115 -427 Transfers to income statement -3 -2 -17 -19 -46 -44 Transfers to inventory/property, plant and equipment 2 0 4 -3 -3 4 Deferred taxes 69 62 132 69 32 95 Net investment hedges Fair value gains/losses -1 -1 -2 -4 -7 -4 Deferred taxes 0 0 0 1 1 1 Exchange differences on translating foreign operations 2) -18 9 -31 22 63 10 Share of other comprehensive income of associates and joint ventures 6 3 10 3 1 8 -278 -231 -537 -252 -73 -358 Items that will not be reclassified to profit or loss in subsequent periods: Actuarial gains/losses on defined benefit plans 0 0 0 0 26 26 Actuarial gains/losses on defined benefit plans in associates and joint ventures 0 0 0 0 2 2 0 0 0 0 28 28 Other comprehensive income/expense, net of deferred taxes -278 -231 -537 -252 -45 -331 Total comprehensive income/expense -250 -180 24 267 718 475 Total comprehensive income/expense attributable to: Owners of the parent -246 -179 26 266 718 477 Non-controlling interests -4 0 -2 0 0 -2 -250 -180 24 267 718 475 1) Fair valuation of cash flow hedges mainly relates to fair valuation of derivatives, such as futures and forwards, hedging commodity price for future transactions, where hedge accounting is applied. When commodity price is higher (lower) than the hedging price, the impact on equity is negative (positive). 2) Translation differences from translation of foreign entities, mainly from SEK and NOK. Fortum Corporation January–September 2026 Interim Report 24
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Condensed consolidated balance sheet EUR million Note 30 Sep 2026 31 Dec 2025 ASSETS Non-current assets Intangible assets 555 558 Property, plant and equipment and right-of-use assets 6,536 6,572 Participations in associates and joint ventures 1,339 1,335 Share in the State Nuclear Waste Management Fund 13 1,174 1,153 Other non-current assets 282 274 Deferred tax assets 783 812 Derivative financial instruments 5 326 145 Long-term interest-bearing receivables 11 611 565 Total non-current assets 11,607 11,414 Current assets Inventories 499 512 Derivative financial instruments 5 557 188 Short-term interest-bearing receivables 1) 11 175 538 Trade and other receivables 683 889 Liquid funds 12 2,325 2,903 Total current assets 4,239 5,030 Total assets 15,846 16,444 EQUITY Equity attributable to owners of the parent Share capital 3,046 3,046 Share premium 73 73 Retained earnings 5,199 5,333 Other equity components -420 87 Total 7,898 8,539 Non-controlling interests 81 81 Total equity 7,979 8,620 LIABILITIES Non-current liabilities Interest-bearing liabilities 12 3,624 3,595 Derivative financial instruments 5 547 174 Deferred tax liabilities 218 362 Nuclear provisions 13 1,174 1,153 Other non-current liabilities 248 252 Total non-current liabilities 5,811 5,534 Current liabilities Interest-bearing liabilities 12 511 1,151 Derivative financial instruments 5 887 257 Trade and other payables 1) 657 881 Total current liabilities 2,055 2,289 Total liabilities 7,867 7,824 Total equity and liabilities 15,846 16,444 1) Margin receivables ( 31 Dec 2025: 179) and margin liabilities (31 Dec 2025: 55) for 2025 are presented in short-term interest-bearing receivables and in trade and other payables respectively. For additional information, see Note 5 Financial risk management. Fortum Corporation January–September 2026 Interim Report 25
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Condensed consolidated statement of changes in total equity Retained earnings Other equity components EUR million Share capital Share premium Retained earnings Translation of foreign operations Cash flow hedges Other OCI items OCI items associates and joint ventures Owners of the parent Non- controlling interests Total equity Total equity 1 January 2026 3,046 73 6,292 -959 2 26 59 8,539 81 8,620 Net profit 561 561 0 561 Translation differences -29 1 0 -2 -30 -2 -31 Other comprehensive income -514 -2 10 -506 0 -506 Total comprehensive income for the period 561 -29 -513 -1 7 26 -2 24 Cash dividend -664 -664 0 -664 Transactions with non-controlling interests 0 1 1 Other -2 -2 0 -2 Total equity 30 September 2026 3,046 73 6,187 -988 -511 25 66 7,898 81 7,979 Total equity 1 January 2025 3,046 73 6,780 -1,010 127 5 53 9,074 79 9,154 Net profit 520 520 -1 519 Translation differences 15 4 0 2 21 1 22 Other comprehensive income -274 -3 3 -274 0 -274 Total comprehensive income for the period 520 15 -270 -3 5 266 0 267 Cash dividend -1,256 -1,256 0 -1,256 Other 2 2 0 2 Total equity 30 September 2025 3,046 73 6,045 -996 -142 2 58 8,087 81 8,168 Total equity 1 January 2025 3,046 73 6,780 -1,010 127 5 53 9,074 79 9,154 Net profit 765 765 -2 763 Translation differences 51 6 0 3 61 2 63 Other comprehensive income -132 21 3 -108 0 -108 Total comprehensive income for the period 765 51 -126 21 6 718 0 718 Cash dividend -1,256 -1,256 0 -1,256 Transactions with non-controlling interests 0 2 2 Other 3 3 0 3 Total equity 31 December 2025 3,046 73 6,292 -959 2 26 59 8,539 81 8,620 Additional equity information Translation differences Translation of financial information from operations in foreign currency is done using the average rate for the income statement and the end rate for the balance sheet. The exchange rate differences arising from translation to EUR are recognised in equity (mainly from SEK and NOK). For information regarding exchange rates used, see Note 1.4 Key exchange rates used in consolidated financial statements. Cash flow hedges The impact on equity attributable to owners of the parent from fair valuation of cash flow hedges mainly relates to fair valuation of commodity derivatives, such as futures and forwards, hedging commodity sales price of future transactions, where hedge accounting is applied. When commodity market price is higher (lower) than the hedging price, the impact on equity is negative (positive). Fortum Corporation January–September 2026 Interim Report 26
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Cash dividends A dividend for 2025 of EUR 0.74 per share, amounting to a total of EUR 664 million, was decided in the Annual General Meeting on 31 March 2026. The dividend was paid on 14 April 2026. A dividend for 2024 of EUR 1.40 per share, amounting to a total of EUR 1,256 million, was decided in the Annual General Meeting on 1 April 2025. The dividend was paid on 10 April 2025. See also Note 10 Dividend per share. Fortum Corporation January–September 2026 Interim Report 27
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Condensed consolidated cash flow statement EUR million Note III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Cash flow from operating activities Net profit 28 51 561 519 763 805 Adjustments: Income tax expense 17 7 135 117 173 191 Finance costs - net 7 11 27 44 59 42 Share of profit/loss of associates and joint ventures 7 20 -9 -24 -45 -56 -34 Depreciation and amortisation 3 80 78 239 230 315 324 Operating profit before depreciations (EBITDA) 152 138 937 864 1,254 1,328 Items affecting comparability 3, 4 30 36 30 40 -15 -25 Comparable EBITDA 182 175 967 903 1,240 1,303 Non-cash and other items -3 -7 -14 -10 -24 -28 Interest received 18 23 60 89 113 84 Interest paid -13 -15 -136 -150 -173 -159 Dividends received 2 7 15 22 23 17 Realised foreign exchange results and other financial items 20 -9 -66 -85 -113 -94 Income taxes paid -31 -48 -104 -131 -147 -120 Funds from operations 176 125 723 639 918 1,002 Settlements of future contracts -21 0 -29 0 0 -29 Change in working capital -20 6 119 148 -78 -108 Net cash from operating activities 134 131 813 787 840 866 Cash flow from investing activities Capital expenditures 3 -135 -112 -347 -341 -499 -505 Acquisitions of shares 6 -11 -9 -21 -57 -88 -52 Proceeds from sales of property, plant and equipment 0 2 0 2 1 -1 Divestments of shares and capital returns 6 0 0 2 -1 -1 3 Shareholder loans to associated companies and joint ventures 11 -33 -13 -66 -83 -101 -84 Change in margin receivables 11 0 1 -60 46 26 -79 Change in deposits and securities 12 -62 51 -42 39 57 -24 Change in other interest-bearing receivables 11 -10 -1 66 77 48 38 Net cash from/used in investing activities -251 -82 -467 -320 -557 -705 Cash flow before financing activities -117 50 346 467 283 161 Cash flow from financing activities Proceeds from long-term liabilities 12 0 0 90 10 14 94 Payments of long-term liabilities 12 -4 -5 -772 -23 -35 -784 Change in short-term liabilities 12 283 -13 351 -131 -149 333 Dividends paid to the owners of the parent 10 0 0 -664 -1,256 -1,256 -664 Change in margin liabilities 0 -42 19 -75 -38 57 Other financing activities 0 2 1 2 2 2 Net cash from/used in financing activities 278 -58 -975 -1,473 -1,461 -963 Net increase(+)/decrease(-) in cash and cash equivalents 161 -9 -629 -1,006 -1,179 -802 Cash and cash equivalents at the beginning of the period 12 2,089 3,051 2,870 4,046 4,046 3,041 Foreign exchange differences and expected credit loss allowance in cash and cash equivalents 0 -1 9 2 2 10 Cash and cash equivalents at the end of the period 12 2,250 3,041 2,250 3,041 2,870 2,250 Fortum Corporation January–September 2026 Interim Report 28
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Additional cash flow information Change in working capital EUR million III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Change in interest-free receivables, decrease(+)/increase(-) -31 44 204 385 94 -87 Change in inventories, decrease(+)/increase(-) -19 18 10 8 -94 -92 Change in interest-free liabilities, decrease(-)/increase(+) 29 -55 -95 -245 -78 72 Total -20 6 119 148 -78 -108 Change in liability to return emission rights is presented in Change in working capital in I-III/2026 (previously in non-cash and other items) with no change to Net cash from operating activities. Comparatives have been reclassified accordingly. Capital expenditure in cash flow EUR million III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Capital expenditure 139 104 362 340 500 522 Change in not yet paid investments, decrease(+)/increase(-) -1 11 -4 8 10 -3 Capitalised borrowing costs -3 -3 -11 -7 -10 -14 Total 135 112 347 341 499 505 Acquisition of shares in cash flow Acquisition of shares, net of cash acquired, amounted to EUR 21 million during I-III/2026 (I-III/2025: 57). For further information, see Note 6 Acquisitions and disposals. Change in net debt EUR million Note I-III/2026 2025 Net debt, beginning of the period 1,843 692 Net cash flow: Comparable EBITDA 967 1,240 Non-cash and other items -14 -24 Paid net financial costs and dividends received -60 -37 Realised foreign exchange results and other financial items -66 -113 Income taxes paid -104 -147 Settlement of future contracts -29 0 Change in working capital 119 -78 Capital expenditures -347 -499 Acquisitions -21 -88 Divestments and proceeds from sale of property, plant and equipment 2 0 Change in interest-bearing receivables -60 -27 Dividends to the owners of the parent -664 -1,256 Change in margin liabilities 19 -38 Other financing activities 1 2 Net cash flow ('-' increase in net debt) -256 -1,066 Change in collateral debt -236 55 Foreign exchange rate differences and other changes -51 30 Net debt, end of the period 12 1,811 1,843 Fortum Corporation January–September 2026 Interim Report 29
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Capital risk management Fortum’s long-term financial targets are: • Long-term Group Comparable RONA of 14%. • To ensure a credit rating of BBB, Net debt to Comparable EBITDA can be a maximum of 2.5 times. S&P Global Ratings and Fitch Ratings currently rate Fortum as BBB+ with Stable Outlook. The definition of the measure for capital structure has been updated to Net debt to Comparable EBITDA from previously reported Financial net debt to Comparable EBITDA from the first quarter of 2026 onwards. See further information in Note 5 Financial risk management and Note 12 Interest-bearing net debt. • To ensure required returns for any potential new investments, Fortum continues to be selective and applies the set investment criteria; project-based WACC + 150–400 investment hurdles depending on the technology or investment project, as well as environmental targets. • Fortum’s dividend policy is a payout ratio of 60–90% of comparable EPS. The upper end of the pay-out range is applied in situations with a strong balance sheet and low investments, while the lower end of the range is applied in situations with high leverage and/or significant investments and high capital expenditure. Fortum seeks to continue to pay competitive cash dividends. • Fortum expects its Comparable operating profit to improve by EUR 330 million by 2030 compared to the base line of EUR 930 million. This improvement is based on own actions and does not include effects from capital expenditure, M&A or power price changes. Comparable EBITDA and Comparable operating profit are defined as alternative performance measures and used as components in the capital structure target 'Net debt to Comparable EBITDA' and in 'Comparable RONA' respectively. See Note 3 Segment information and Note 19 Definitions and reconciliations of key figures. Net debt/comparable EBITDA EUR million Note LTM 2025 + Interest-bearing liabilities 4,136 4,746 - Liquid funds 2,325 2,903 Net debt 12 1,811 1,843 - Collateral arrangement 241 - Margin receivables 179 +Margin liabilities 55 +/- Net margin liabilities/receivables -124 Financial net debt 1,479 Operating profit 1,004 939 + Depreciation and amortisation 324 315 EBITDA 1,328 1,254 - Items affecting comparability -25 -15 Comparable EBITDA 1,303 1,240 Net debt/comparable EBITDA 1.4 1.5 Financial net debt/comparable EBITDA N/A 1.2 Fortum Corporation January–September 2026 Interim Report 30
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Key figures EUR million or as indicated III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Reported Sales 1,114 929 4,229 3,545 4,989 5,673 Operating profit 72 60 699 634 939 1,004 Share of profit of associates and joint ventures -20 9 24 45 56 34 Net profit (after non-controlling interests) 31 52 561 520 765 807 Earnings per share, EUR 0.04 0.06 0.63 0.58 0.85 0.90 Net cash from operating activities 134 131 813 787 840 866 Capital expenditure and gross investments in shares 150 114 383 404 617 596 Capital expenditure 139 104 362 340 500 522 Number of employees 4,654 4,602 4,551 EUR million or as indicated III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Comparable EBITDA 182 175 967 903 1,240 1,303 Operating profit 102 97 729 674 924 979 Share of profit of associates and joint ventures -1 -1 -5 14 28 9 Return on net assets (RONA), % 10.9 10.9 Net assets (at period-end) 9,047 8,674 9,150 Net profit (after non-controlling interests) 65 70 544 531 739 751 Earnings per share, EUR 0.08 0.08 0.61 0.59 0.82 0.84 EUR million or as indicated 2025 LTM Financial position 1) Net debt (at period-end) 1,843 1,811 Net debt/comparable EBITDA 1.5 1.4 Financial net debt (at period-end) 1,479 N/A Financial net debt/comparable EBITDA 1.2 N/A 1) Following the transition of Nasdaq's Nordic power futures business to Euronext, Fortum reports Net debt instead of Financial net debt from the first quarter of 2026 onwards. See Note 12 Interest-bearing net debt. EUR or as indicated 30 Sep 2026 31 Dec 2025 Equity per share, EUR 8.80 9.52 Average number of shares, 1,000 shares 897,264 897,264 Diluted adjusted average number of shares, 1,000 shares 897,264 897,264 Number of registered shares, 1,000 shares 897,264 897,264 Fortum Corporation January–September 2026 Interim Report 31
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Notes to the condensed consolidated interim financial statements 1 Significant accounting policies 1.1 Basis of preparation The unaudited condensed interim financial statements have been prepared in accordance with International Accounting Standard (IAS) 34, Interim Financial Reporting, as adopted by the EU. The term “IFRS Accounting Standards” used in this document refers to IFRS® Accounting standards as issued by the International Accounting Standards Board (IASB) as well as interpretations of these standards as issued by IASB’s Standards Interpretation Committee (SIC®) and IFRS Interpretations Committee (IFRIC®). The condensed interim financial report should be read in conjunction with the consolidated financial statements for the year ended 31 December 2025. The figures in the condensed interim financial statements have been rounded and consequently the sum of individual figures may deviate from the sum presented. Key figures have been calculated using exact figures. Part of Fortum’s business operations are seasonal, with the comparable operating profit usually being higher for the first and fourth quarter of the year. Columns labelled as 'LTM' or 'last twelve months' present figures for twelve months preceding the reporting date. 1.2 Alternative performance measures According to the ESMA Guidelines on Alternative Performance Measures, an Alternative Performance Measure (APM) is understood as a financial measure of historical or future financial performance, financial position, or cash flows, other than a financial measure defined or specified in the applicable financial reporting framework. Fortum uses APMs, such as Comparable operating profit, Comparable EBITDA and Comparable return on net assets (RONA), in the financial target setting and forecasting, management's follow-up of financial performance of segments and the Group, as well as for the allocation of resources in the Group's performance management process. Items affecting comparability are excluded from Comparable operating profit, Comparable EBITDA and Comparable return on net assets (RONA) and disclosed separately in Fortum's consolidated income statement to support the transparency of underlying business performance when comparing results between periods. Fortum’s long-term financial target for capital structure measure is Net debt to comparable EBITDA (see Capital risk management and Note 19 Definitions and reconciliations of key figures). See also Note 4 Comparable operating profit and comparable net profit and Note 19 Definitions and reconciliations of key figures. 1.3 Accounting policies The same accounting policies that were applied in the preparation of the consolidated financial statements for the year ended 31 December 2025, have been applied in these condensed interim financial statements. New accounting standards, amendments and interpretations effective from 1 January 2026 did not have a material impact on Fortum's consolidated financial statements. IFRS 18 Presentation and Disclosure in Financial Statements replaces IAS 1 Presentation of Financial Statements. The effective date is 1 January 2027 and Fortum will apply the standard from the effective date. The standard will mainly have an impact on the presentation of the consolidated income statement and the consolidated cash flow statement, but will not impact the recognition or measurement of items. A reconciliation presenting the transition from IAS 1 presentation requirements to the IFRS 18 presentation format will be included in the 2026 Financial Statements Bulletin. The consolidated income statement will include separate categories for operating, investing, financing, income taxes and discontinued operations. Although the adoption of IFRS 18 will not have an impact on net profit, the reclassification of income and expense items on the consolidated income statement will have some impact on comparable operating profit, operating profit and the presentation of financial items. The impact on comparable operating profit is expected to be limited, although, some items will be reclassified from finance costs - net. In addition, operating profit will be affected by the reclassification of the return from the nuclear fund and the nuclear fund adjustment from finance costs – net to items affecting comparability. These nuclear-fund related items will be classified as items affecting comparability to support the transparency of underlying business performance when comparing results between periods. Fortum Corporation Notes to the condensed consolidated interim financial statements January–September 2026 Interim Report 32
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The current finance costs – net presentation will be replaced by separate investing and financing categories. The investing category is expected to mainly include interest income, foreign exchange differences on internal loan receivables, as well as foreign exchange differences related to hedging activities. The financing category is expected to mainly include interest expenses and unwinding of discounting on nuclear provisions. Some items in finance costs – net will be reclassified to the operating category. The new standard also requires disclosure of ‘management defined performance measures’ in the notes to the consolidated financial statements, similar to what Fortum already presents for alternative performance measures. The consolidated cash flow statement presentation will change so that interest income and dividends received that are currently presented in operating cash flows will be included in investing cash flows while interest paid will be included in financing cash flow. Other new accounting standards, amendments and interpretations issued and effective from 1 January 2027 or later are not expected to have a material impact on Fortum’s consolidated financial statements. 1.4 Key exchange rates used in consolidated financial statements The balance sheet date rate is based on the exchange rate published by the European Central Bank for the closing date. The average exchange rate is calculated as an average of daily closing rates from the European Central Bank. Key exchange rates used in consolidated financial statements: Average rate Jan–Sep 2026 Jan–Jun 2026 Jan–Mar 2026 Jan–Dec 2025 Jan–Sep 2025 Jan–Jun 2025 Jan–Mar 2025 Norway (NOK) 11.0907 11.1707 11.3820 11.7173 11.7076 11.6547 11.6514 Poland (PLN) 4.2705 4.2423 4.2350 4.2397 4.2405 4.2297 4.2015 Sweden (SEK) 10.8971 10.7895 10.6947 11.0663 11.1045 11.0787 11.2352 Balance sheet date rate 30 Sep 2026 30 Jun 2026 31 Mar 2026 31 Dec 2025 30 Sep 2025 30 Jun 2025 31 Mar 2025 Norway (NOK) 10.9015 11.3105 11.2125 11.8430 11.7265 11.8345 11.4130 Poland (PLN) 4.3690 4.2955 4.2890 4.2210 4.2698 4.2423 4.1840 Sweden (SEK) 11.3310 11.0935 10.9430 10.8215 11.0565 11.1465 10.8490 2 Critical accounting estimates and judgements The preparation of interim financial statements requires management to make judgements, estimates and assumptions that affect the reported amounts of assets and liabilities, income and expense. Actual results may differ from these estimates. In preparing these interim financial statements, significant judgements made by management in applying the Group's accounting policies and the key sources of estimation uncertainty were materially the same as those that applied to the consolidated financial statements for the year ended 31 December 2025. The Google PPA signed on 9 September has increased the level of estimation uncertainty related to the fair value measurements due to its long duration and reliance on unobservable valuation inputs. See further information in Note 5 Financial risk management. Fortum Corporation Notes to the condensed consolidated interim financial statements January–September 2026 Interim Report 33
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3 Segment information Fortum’s reportable segments under IFRS Accounting Standards are: • The Generation segment, which includes Hydro Generation, Nuclear Generation, Corporate Customers and Markets, and Renewables and Decarbonisation business units. • The Consumer Solutions segment, which consists of the Consumer Solutions business unit. • The Other Operations segment, which includes innovation and venturing activities, enabling functions and corporate management. It also includes the remaining Circular Solutions businesses, mainly the battery recycling business. Quarter Generation 1) Consumer Solutions Other Operations Total EUR million Note III/2026 III/2025 III/2026 III/2025 III/2026 III/2025 III/2026 III/2025 Income statement data by segment Power sales 530 513 668 494 0 0 1,198 1,007 Heat sales 69 64 0 0 0 0 69 64 Gas sales 0 0 64 69 0 0 64 69 Other sales 17 13 13 11 45 45 75 69 Sales 615 590 745 573 45 45 1,405 1,209 Internal eliminations 10 -17 -10 -4 -42 -39 -42 -60 Netting of Nord Pool transactions 2) -250 -220 External sales 626 573 735 569 3 6 1,114 929 Comparable EBITDA 175 142 36 46 -29 -13 182 175 Depreciation and amortisation -53 -50 -22 -23 -4 -5 -80 -78 Comparable operating profit 121 92 14 23 -33 -18 102 97 Impairment charges and reversals 0 0 0 0 0 0 0 0 Capital gains and other related items 6 0 0 0 0 -2 0 -2 0 Changes in fair values of derivatives hedging future cash flow -25 -38 -1 2 0 0 -26 -37 Other 0 0 0 0 -1 0 -1 0 Items affecting comparability 4 -25 -38 -1 2 -3 0 -30 -36 Operating profit 96 54 12 25 -36 -18 72 60 Comparable share of profit of associates and joint ventures 4, 7 0 0 0 0 -1 0 -1 -1 Share of profit of associates and joint ventures 7 -19 9 0 0 -1 0 -20 9 Gross investments / divestments by segment Gross investments in shares 6 0 0 0 0 11 9 11 9 Capital expenditure 120 88 18 15 1 1 139 104 Gross divestments of shares 6 0 0 0 0 0 0 0 0 1) Power sales, both internal and external, include effects from realised hedging contracts. Effect on sales can be negative or positive depending on the difference between average contract price and realised spot price. Power sales contains realised result from commodity derivatives, which have not had hedge accounting status under IFRS 9, but have been considered operatively as hedges. Power sales also include sale of renewable and nuclear energy certificates EUR 5 million (III/2025: 15). 2) Sales and purchases with Nord Pool Spot are netted on Group level on a 15 minutes or an hourly basis depending on the market area and posted either as revenue or cost depending on if Fortum is a net seller or net buyer during any particular 15 minutes or hour. Fortum Corporation Notes to the condensed consolidated interim financial statements January–September 2026 Interim Report 34
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Year-to-date Generation 1) Consumer Solutions Other Operations Total EUR million Note I-III/2026 I-III/2025 I-III/2026 I-III/2025 I-III/2026 I-III/2025 I-III/2026 I-III/2025 Income statement data by segment Power sales 2,151 1,926 2,553 1,843 0 0 4,704 3,769 Heat sales 409 355 0 0 0 0 409 355 Gas sales 0 0 251 279 0 0 251 279 Other sales 54 46 29 25 133 138 216 208 Sales 2,614 2,327 2,833 2,146 133 138 5,580 4,611 Internal eliminations 75 -145 -15 -7 -124 -116 -64 -267 Netting of Nord Pool transactions 2) -1,287 -798 External sales 2,689 2,182 2,818 2,140 9 22 4,229 3,545 Comparable EBITDA 894 798 146 161 -73 -55 967 903 Depreciation and amortisation -160 -150 -65 -65 -13 -15 -239 -230 Comparable operating profit 734 648 80 96 -86 -70 729 674 Impairment charges and reversals 0 -21 0 0 0 0 0 -21 Capital gains and other related items 6 2 0 0 -1 -2 -2 0 -3 Changes in fair values of derivatives hedging future cash flow -26 -19 -2 5 0 0 -28 -14 Other 0 -1 0 0 -1 0 -1 -2 Items affecting comparability 4 -24 -42 -2 4 -3 -2 -30 -40 Operating profit 710 607 78 100 -89 -72 699 634 Comparable share of profit of associates and joint ventures 4, 7 -7 13 0 0 1 1 -5 14 Share of profit of associates and joint ventures 7 23 44 0 0 1 1 24 45 Gross investments / divestments by segment Gross investments in shares 6 3 20 0 21 18 23 21 64 Capital expenditure 309 296 48 42 4 2 362 340 Gross divestments of shares 6 2 -2 0 0 0 -2 2 -4 1) Power sales, both internal and external, include effects from realised hedging contracts. Effect on sales can be negative or positive depending on the difference between average contract price and realised spot price. Power sales contains realised result from commodity derivatives, which have not had hedge accounting status under IFRS 9, but have been considered operatively as hedges. Power sales also include sale of renewable and nuclear energy certificates EUR 88 million (I-III/2025: 113). 2) Sales and purchases with Nord Pool Spot are netted on Group level on a 15 minutes or an hourly basis depending on the market area and posted either as revenue or cost depending on if Fortum is a net seller or net buyer during any particular 15 minutes or hour. Fortum Corporation Notes to the condensed consolidated interim financial statements January–September 2026 Interim Report 35
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Last twelve months Generation 1) Consumer Solutions Other Operations Total EUR million Note LTM 2025 LTM 2025 LTM 2025 LTM 2025 Income statement data by segment Power sales 2,867 2,642 3,317 2,607 0 0 6,184 5,249 Heat sales 587 533 0 0 0 0 587 533 Gas sales 0 0 359 387 0 0 359 387 Other sales 79 70 39 35 183 187 300 292 Sales 3,533 3,245 3,716 3,029 183 187 7,431 6,461 Internal eliminations 50 -170 -16 -8 -167 -158 -133 -336 Netting of Nord Pool transactions 2) -1,625 -1,136 External sales 3,583 3,075 3,700 3,021 16 29 5,673 4,989 Comparable EBITDA 1,194 1,098 198 213 -89 -71 1,303 1,240 Depreciation and amortisation -215 -204 -92 -92 -17 -19 -324 -315 Comparable operating profit 979 893 106 122 -106 -91 979 924 Impairment charges and reversals 0 -20 0 0 -5 -5 -4 -25 Capital gains and other related items 6 2 0 0 -1 -3 -2 -1 -4 Changes in fair values of derivatives hedging future cash flow 33 40 -1 6 0 0 32 47 Other 0 -1 0 0 -3 -2 -3 -3 Items affecting comparability 4 36 18 -1 5 -10 -9 25 15 Operating profit 1,015 912 105 127 -116 -100 1,004 939 Comparable share of profit of associates and joint ventures 4, 7 9 28 0 0 0 0 9 28 Share of profit of associates and joint ventures 7 35 56 0 0 0 0 34 56 Gross investments / divestments by segment Gross investments in shares 6 45 62 -1 20 30 35 74 117 Capital expenditure 452 438 64 58 6 4 522 500 Gross divestments of shares 6 2 -2 0 0 0 -1 3 -3 1) Sales, both internal and external, include effects from realised hedging contracts. Effect on sales can be negative or positive depending on the difference between average contract price and realised spot price. Power sales contains realised result from commodity derivatives, which have not had hedge accounting status under IFRS 9, but have been considered operatively as hedges. Power sales also include sale of renewable and nuclear energy certificates EUR 109 million (2025: 134). 2) Sales and purchases with Nord Pool Spot are netted on Group level on a 15 minutes or an hourly basis depending on the market area and posted either as revenue or cost depending on if Fortum is a net seller or net buyer during any particular 15 minutes or hour. Fortum Corporation Notes to the condensed consolidated interim financial statements January–September 2026 Interim Report 36
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Segment assets and liabilities Generation Consumer Solutions Other Operations Total EUR million Note 30 Sep 2026 31 Dec 2025 30 Sep 2026 31 Dec 2025 30 Sep 2026 31 Dec 2025 30 Sep 2026 31 Dec 2025 Non-interest-bearing assets 7,212 7,491 1,036 1,051 274 286 8,523 8,827 Participations in associates and joint ventures 1,231 1,243 0 0 109 92 1,339 1,335 Eliminations -44 -107 Total segment assets 8,443 8,734 1,036 1,051 383 377 9,818 10,054 Interest-bearing receivables 11 786 925 Deferred tax assets 783 812 Other assets 2,133 1,750 Liquid funds 2,325 2,903 Total assets 15,846 16,444 Segment liabilities 594 599 193 333 28 80 815 1,012 Eliminations -44 -107 Total segment liabilities 771 905 Deferred tax liabilities 218 362 Other liabilities 2,742 1,811 Total liabilities included in capital employed 3,731 3,078 Interest-bearing liabilities 12 4,136 4,746 Total equity 7,979 8,620 Total equity and liabilities 15,846 16,444 Number of employees 2,254 2,139 1,128 1,134 1,272 1,278 4,654 4,551 Comparable operating profit including comparable share of profits of associates and joint ventures and Comparable return on net assets Generation Consumer Solutions Other Operations Total EUR million Note LTM 31 Dec 2025 LTM 31 Dec 2025 LTM 31 Dec 2025 LTM 31 Dec 2025 Comparable operating profit 979 893 106 122 -106 -91 979 924 Comparable share of profit of associates and joint ventures 4, 7 9 28 0 0 0 0 9 28 Comparable operating profit including comparable share of profit/loss of associates and joint ventures 988 922 106 122 -106 -91 988 952 Segment assets at the end of the period 8,443 8,734 1,036 1,051 383 377 9,818 10,054 Segment liabilities at the end of the period 594 599 193 333 28 80 771 905 Comparable net assets 7,848 8,135 843 718 355 297 9,047 9,150 Comparable net assets average 1) 7,966 7,841 752 666 321 240 9,040 8,746 Comparable return on net assets (RONA), % 12.4 11.8 14.1 18.3 -33.0 -38.0 10.9 10.9 1) Average net assets are calculated using the opening balance of the financial year and each quarter's closing value. Fortum Corporation Notes to the condensed consolidated interim financial statements January–September 2026 Interim Report 37
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4 Comparable operating profit and comparable net profit 4.1 Reconciliation of operating profit to comparable operating profit Quarter Unadjusted Impairment charges and reversals Capital gains and other related items Changes in fair values of derivatives hedging future cash flow Other Reported EUR million III/2026 III/2025 III/2026 III/2025 III/2026 III/2025 III/2026 III/2025 III/2026 III/2025 III/2026 III/2025 Sales 1,168 926 0 0 0 0 -55 3 0 0 1,114 929 Other income -71 -31 0 0 0 0 79 36 0 0 8 4 Materials and services -722 -552 0 0 0 0 0 -1 0 0 -722 -553 Employee benefits -101 -97 0 0 0 0 0 0 0 0 -101 -98 Depreciation and amortisation -80 -78 0 0 0 0 0 0 0 0 -80 -78 Other expenses -122 -108 0 0 2 0 1 -1 1 0 -117 -109 Comparable operating profit 0 0 2 0 26 37 1 0 102 97 Items affecting comparability 0 0 -2 0 -26 -37 -1 0 -30 -36 Operating profit 72 60 72 60 Year-to-date Unadjusted Impairment charges and reversals Capital gains and other related items Changes in fair values of derivatives hedging future cash flow Other Reported EUR million I-III/2026 I-III/2025 I-III/2026 I-III/2025 I-III/2026 I-III/2025 I-III/2026 I-III/2025 I-III/2026 I-III/2025 I-III/2026 I-III/2025 Sales 4,236 3,551 0 0 0 0 -7 -6 0 0 4,229 3,545 Other income -11 -10 0 0 -2 1 33 25 0 0 20 16 Materials and services -2,636 -2,041 0 0 0 0 0 -2 0 0 -2,636 -2,043 Employee benefits -322 -306 0 0 0 0 0 0 0 1 -322 -304 Depreciation and amortisation -239 -251 0 21 0 0 0 0 0 0 -239 -230 Other expenses -329 -309 0 0 2 1 2 -3 1 0 -324 -311 Comparable operating profit 0 21 0 2 28 14 1 2 729 674 Items affecting comparability 0 -21 0 -3 -28 -14 -1 -2 -30 -40 Operating profit 699 634 699 634 Fortum Corporation Notes to the condensed consolidated interim financial statements January–September 2026 Interim Report 38
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Last twelve months Unadjusted Impairment charges and reversals Capital gains and other related items Changes in fair values of derivatives hedging future cash flow Other Reported EUR million LTM 2025 LTM 2025 LTM 2025 LTM 2025 LTM 2025 LTM 2025 Sales 5,691 5,006 0 0 0 0 -18 -17 0 0 5,673 4,989 Other income 46 47 0 0 -3 0 -16 -23 0 0 28 24 Materials and services -3,495 -2,900 0 0 0 0 0 -2 0 0 -3,494 -2,901 Employee benefits -436 -420 0 0 0 0 0 0 0 1 -436 -419 Depreciation and amortisation -328 -341 4 25 0 0 0 0 0 0 -324 -315 Other expenses -473 -453 0 0 4 3 0 -5 2 2 -467 -454 Comparable operating profit 4 25 1 3 -32 -47 3 3 979 924 Items affecting comparability -4 -25 -1 -4 32 47 -3 -3 25 15 Operating profit 1,004 939 1,004 939 Impairment charges and reversals Impairment charges are adjusted from depreciation and amortisation and presented in items affecting comparability. In 2025 impairment charges and reversals included mainly impairment charges of assets in India. Capital gains and other related items Capital gains and transaction costs from acquisitions are adjusted from other income and other expenses and presented in items affecting comparability. See Note 6 Acquisitions and disposals. Changes in fair values of derivatives hedging future cash flow Fair value changes of derivatives to which hedge accounting is not applied and which hedge future cash flows are adjusted from other income and other expenses and presented in items affecting comparability. Impacts from settlement of physical contracts that have been treated as derivatives are adjusted from other income and other expenses to sales and materials and services to reflect the contract pricing as opposed to market pricing. Other Restructuring and cost management expenses, and other miscellaneous non-operating items are adjusted mainly from materials and services or other expenses. 4.2 Reconciliation from comparable operating profit to comparable net profit Comparable net profit and comparable earnings per share EUR million Note III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Comparable operating profit 102 97 729 674 924 979 Comparable share of profit/loss of associates and joint ventures 7 -1 -1 -5 14 28 9 Comparable finance costs - net 8 -14 -14 -39 -40 -54 -54 Comparable profit before income tax 88 82 684 648 898 934 Comparable income tax expense 9 -22 -13 -141 -119 -163 -186 Comparable non-controlling interests 0 1 1 2 4 3 Comparable net profit 65 70 544 531 739 751 Comparable earnings per share, EUR 19 0.08 0.08 0.61 0.59 0.82 0.84 Fortum Corporation Notes to the condensed consolidated interim financial statements January–September 2026 Interim Report 39
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Reconciliation from net profit to comparable net profit EUR million Note III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Net profit 28 51 561 519 763 805 - Items affecting comparability 30 36 30 40 -15 -25 - Adjustments to share of profit/loss of associates and joint ventures 7 19 -9 -30 -31 -27 -26 - Adjustments to finance costs - net 8 -7 -3 -12 4 4 -12 - Adjustments to income tax expenses 9 -5 -6 -6 -2 10 5 - Non-controlling interests 3 1 0 1 2 1 - Adjustments to non-controlling interests -3 1 1 2 1 1 Comparable net profit 65 70 544 531 739 751 Comparable share of profit/loss of associates and joint ventures Share of profit/loss of associates and joint ventures is adjusted for significant items, similar to adjustments made to arriving at comparable net profit. Comparable finance costs - net Finance costs – net are adjusted for e.g. nuclear-related items recognised in other financial items - net, fair value changes on financial items, as well as impairment charges and reversals of previously recorded impairment charges on financial items and other one-time adjustments. See Note 8 Finance costs – net. Comparable income tax expense Income tax expense is adjusted for tax impacts on items affecting comparability, adjustments to finance costs – net, tax rate changes and other one-time adjustments. Comparable non-controlling interests Non-controlling interests are adjusted for impacts relating to the non-controlling interests on items affecting comparability, adjustments to share of profit/loss of associates and joint ventures, adjustments to finance costs – net and adjustments to income tax expense. EUR million III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Non-controlling interests 3 1 0 1 2 1 Adjustments to non-controlling interests -3 1 1 2 1 1 Comparable non-controlling interests 0 1 1 2 4 3 See Note 19 Definitions and reconciliations of key figures. Fortum Corporation Notes to the condensed consolidated interim financial statements January–September 2026 Interim Report 40
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5 Financial risk management See Fortum Group's consolidated financial statements for the year ended 31 December 2025 for financial risk management objectives and policies, as well as accounting policies in Note 16 Financial assets and liabilities by fair value hierarchy. Transition of the Nordic power futures to Euronext In March 2026, Nasdaq’s Nordic power futures business and trading with Nordic futures transitioned to Euronext and Fortum's position in Nasdaq was migrated to Euronext accordingly. Transition to Euronext changed the accounting for Nordic power futures due to differences in the contract terms. Margin requirements for Nasdaq’s CTM (Collateralised to market) contracts were accounted as collateral and shown as margin receivables/liabilities. Additionally, CTM contracts were recognised as derivative financial instruments and measured at fair value through equity or profit and loss depending on hedge accounting status. The margin for Euronext’s STM (Settled to market) contracts are not recognised on the balance sheet, as daily cash flows are regarded as settlements and thus impacting only cash and equity or profit and loss depending on hedge accounting status. In cash flow, the daily settlements for Euronext STM contracts are presented within 'Net cash from operating activities', whereas settlements for Nasdaq CTM contracts were presented within investing and financing activities depending on whether Fortum paid or received a collateral. Commodity derivative financial instruments on balance sheet include fair values relating to the bilateral electricity contracts. See further information in Note 12 Interest-bearing net debt. Fair value hierarchy information Financial instruments that are measured in the balance sheet at fair value are presented according to following fair value measurement hierarchy: Level 1: quoted prices (unadjusted) in active markets for identical assets or liabilities; Level 2: inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly (i.e. as prices) or indirectly (i.e. derived from prices); Level 3: inputs for the asset or liability that is not based on observable market data (unobservable inputs). The fair value of Level 3 commodity derivatives is determined using a discounted cash flow model. The electricity price estimate is derived using a simulation model incorporating market prices, inflation, hydrology, demand growth, generation capacity, fuel prices, grid capacity and CO2 prices as key inputs and assumptions. The fair value model is adjusted to zero on the date of contract signing when the contract is concluded to be at market terms. The discount rate used in the valuation is determined based on risk-free bond rates. On 9 September, Fortum signed a 22-year nuclear Power Purchase Agreement (PPA). The PPA will start in 2028 with a smaller capacity and will reach 50% of the Loviisa nuclear plant's capacity in 2030–2049. As the PPA is net settled, it is classified as a derivative, measured at fair value and classified as Level 3 in the fair value hierarchy. The contract is designated as a cash flow hedging instrument, reducing the variability of future cash flows arising from changes in electricity market prices. No significant ineffectiveness is expected to arise. The transaction price is concluded to equal the market price meaning that the fair value on the date of signing is zero. Sensitivity and netting If the market price for the commodity derivatives portfolio changes by +/- 1 EUR/MWh, the impact to equity before taxes would be EUR -111/+111 million. Different price change assumptions can be used to assess the impact on sensitivity analysis analogously relative to 1 EUR/MWh change. A +/- 10% change in the discount rate would impact the fair value of the commodity derivatives by EUR+16/-17 million with corresponding impact in equity before taxes. Receivables and liabilities from standard CTM electricity and other commodity derivative contracts against exchanges with same delivery period are netted. Fortum Corporation Notes to the condensed consolidated interim financial statements January–September 2026 Interim Report 41
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Financial assets Level 1 Level 2 Level 3 Netting Total EUR million 30 Sep 2026 31 Dec 2025 30 Sep 2026 31 Dec 2025 30 Sep 2026 31 Dec 2025 30 Sep 2026 31 Dec 2025 30 Sep 2026 31 Dec 2025 In non-current assets Other investments 1) 144 123 144 123 Derivative financial instruments Commodity derivatives Hedge accounting 20 0 124 40 20 -2 0 162 40 Non-hedge accounting 20 5 63 20 23 20 107 46 Interest rate and currency derivatives Hedge accounting 43 59 43 59 Non-hedge accounting 14 0 14 0 Total in non-current assets 41 5 245 120 186 143 -2 0 469 268 In current assets Derivative financial instruments Commodity derivatives Hedge accounting 122 68 219 94 -10 -35 331 128 Non-hedge accounting 11 39 96 50 3 0 0 -32 109 58 Interest rate and currency derivatives Hedge accounting 2 2 2 2 Non-hedge accounting 114 0 114 0 Interest-bearing receivables 2) 94 241 94 241 Total in current assets 227 348 431 147 3 0 -10 -67 651 429 Total in assets 268 353 676 267 189 143 -12 -67 1,120 696 1) Other investments includes shares in unlisted companies. 2) Interest-bearing receivables, Level 1, include collateral arrangement covering initial margin requirements. See also Note 11 Interest-bearing receivables. Fortum Corporation Notes to the condensed consolidated interim financial statements January–September 2026 Interim Report 42
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Financial liabilities Level 1 Level 2 Level 3 Netting Total EUR million 30 Sep 2026 31 Dec 2025 30 Sep 2026 31 Dec 2025 30 Sep 2026 31 Dec 2025 30 Sep 2026 31 Dec 2025 30 Sep 2026 31 Dec 2025 In non-current liabilities Interest-bearing liabilities 1) 724 983 724 983 Derivative financial instruments Commodity derivatives Hedge accounting 1 6 370 61 -2 0 368 66 Non-hedge accounting 17 43 102 17 6 5 124 64 Interest rate and currency derivatives Hedge accounting 55 35 55 35 Non-hedge accounting 0 7 0 7 Total in non-current liabilities 17 49 1,251 1,103 6 5 -2 0 1,271 1,157 In current liabilities Interest-bearing liabilities 94 330 94 330 Derivative financial instruments Commodity derivatives Hedge accounting 4 84 681 45 -10 -35 675 94 Non-hedge accounting 36 65 169 44 2 4 0 -32 207 80 Interest rate and currency derivatives Hedge accounting 3 12 3 12 Non-hedge accounting 2 71 2 71 Total in current liabilities 40 149 949 502 2 4 -10 -67 981 588 Total in liabilities 58 198 2,200 1,605 7 8 -12 -67 2,252 1,745 1) Fair valued part of bonds when hedge accounting is applied (fair value hedge). At the end of September 2026, the net fair value of commodity derivatives was EUR -665 million, including assets of EUR 709 million and liabilities of EUR 1,374 million (31 Dec 2025: EUR -34 million including assets of EUR 271 million and liabilities of EUR 305 million). Net fair value amount of interest rate and currency derivatives was EUR 114 million, including assets of EUR 173 million and liabilities of EUR 59 million. Fortum has cash collaterals based on collateral agreements with some counterparties. At the end of September 2026, Fortum had received EUR 149 million and paid EUR 31 million from foreign exchange and interest rate derivatives under Credit Support Annex agreements. There were no transfers in or out of levels, 1, 2 and 3. Gains and losses of level 3 items in consolidated income statement are presented in other comprehensive income and items affecting comparability. Regarding derivative financial instruments, see Note 4 Comparable operating profit and comparable net profit. Regarding interest- bearing receivables and liabilities, see Note 11 Interest-bearing receivables, Note 12 Interest-bearing net debt and Note 15 Pledged assets and contingent liabilities. Fortum Corporation Notes to the condensed consolidated interim financial statements January–September 2026 Interim Report 43
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6 Acquisitions and disposals 6.1 Acquisitions EUR million III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Gross investments in shares in subsidiary companies 0 0 0 37 78 41 Gross investments in shares in associated companies and joint ventures 5 6 13 20 27 20 Gross investments in other shares 5 3 8 7 12 13 Total 11 9 21 64 117 74 There were no material acquisitions in I-III/2026. On 21 August, Fortum launched a recommended voluntary cash tender offer to the shareholders of the Norwegian electricity retail company Elmera Group ASA. The offer was settled after the reporting period on 23 October, with Fortum now holding approximately 91.92% of Elmera’s issued and outstanding share capital and voting rights (96.12% excluding Elmera's treasury shares). Elmera is expected to be consolidated into Fortum Group as part of the Consumer Solutions segment from 31 October 2026. Fortum intends to carry out a compulsory acquisition of the remaining shares and to pursue a delisting of Elmera’s shares from Euronext Oslo Børs. See note 18 Events after the balance sheet date. On 28 November 2025, Fortum completed the acquisition of a project development portfolio from the German renewables developer and constructor ABO Energy. The acquired portfolio includes approximately 4.4 GW of onshore wind development projects at various stages in Finland. The purchase price of approximately EUR 40 million on a debt-and-cash-free basis was paid at closing (the portfolio includes both acquisition of subsidiary shares and assets). In addition to the purchase price, the transaction includes earn-outs which will be paid subject to projects successfully reaching a final investment decision in the future. The estimated total purchase price including future earn-outs is approximately EUR 61 million. The portfolio is reported in Fortum’s Generation segment. On 30 June 2025, Fortum completed the acquisition of the Polish electricity solutions provider Orange Energia Sp. z o.o. on a cash and debt-free basis for a maximum of approximately PLN 120 million (EUR 28 million). Approximately PLN 90 million (EUR 21 million) was paid in cash. According to an agreed earn-out, the remaining amount will be settled by the beginning of 2029 based on achieved targets. Orange Energia is reported in Fortum’s Consumer Solutions segment’s Comparable Operating Profit from the beginning of the third quarter of 2025. In the first quarter of 2025, Fortum acquired a project development portfolio for renewable power from Enersense. The acquired portfolio includes 2.6 GW of early-stage onshore wind development projects in Finland, of which only a minor part is expected to reach ready-to- build status. The total investment of EUR 16 million include earn-outs that are subject to projects successfully reaching a final investment decision in the future. The portfolio is reported in Fortum’s Generation segment. 6.2 Disposals There were no material disposals in I-III/2026. On 26 June 2025, Fortum completed the divestment of its renewables development portfolio in India to Hexa Climate Solutions Pvt Ltd. The transaction did not have a material cash flow impact. Impairment charges of EUR 21 million related to assets in India are included in items affecting comparability in Generation segment in 2025. Fortum Corporation Notes to the condensed consolidated interim financial statements January–September 2026 Interim Report 44
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7 Share of profit/loss of associates and joint ventures EUR million III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Principal associates Forsmarks Kraftgrupp AB -12 6 7 14 13 6 Kemijoki Oy 0 0 9 -1 -1 9 OKG AB -11 3 2 18 16 1 Principal joint ventures TVO Oyj 2 0 0 0 14 14 Other associates 0 0 2 14 14 1 Other joint ventures 2 0 4 1 0 3 Share of profit of associates and joint ventures -20 9 24 45 56 34 EUR million III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Share of profit of associates and joint ventures -20 9 24 45 56 34 Adjustments to share of profit of associates and joint ventures 19 -9 -30 -31 -27 -26 Comparable share of profit of associates and joint ventures -1 -1 -5 14 28 9 Power plants are often built jointly with other power producers, and owners purchase power at cost. The share of profit/loss is mainly IFRS Accounting Standards adjustments (e.g. accounting for nuclear-related assets and liabilities) and depreciations on fair-value adjustments from acquisitions (Note 19 Participations in associated companies and joint ventures in the Consolidated Financial Statements 2025). Share of profits from other associates in 2025 included a positive impact from the transfer of decommissioning and restoration obligations and related assets that arise from Posiva's final disposal activities. An offsetting impact was included in nuclear fund adjustment in Finance cost - net and Income tax expenses. See Note 13 Nuclear-related assets and liabilities. Fortum Corporation Notes to the condensed consolidated interim financial statements January–September 2026 Interim Report 45
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8 Finance costs – net EUR million III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Interest expense Borrowings -33 -39 -101 -126 -164 -139 Leasing and other interest expenses -1 -1 -3 -2 -3 -4 Capitalised borrowing costs 3 3 11 7 10 14 Total -30 -38 -92 -121 -157 -128 Interest income Loan receivables and deposits 18 22 54 82 104 76 Other interest income 1 1 4 5 7 6 Total 19 24 58 87 111 82 Other financial items – net Return from nuclear fund 17 10 35 31 43 47 Nuclear fund adjustment -3 4 -7 4 4 -7 Unwinding of nuclear provisions -8 -10 -25 -22 -31 -35 Fair value changes, impairments and reversals 1 -1 10 -16 -20 7 Other financial expenses and income -3 0 -5 -6 -8 -8 Total 4 3 7 -10 -13 4 Finance costs – net -7 -11 -27 -44 -59 -42 EUR million III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Finance costs – net -7 -11 -27 -44 -59 -42 Adjustments to finance costs – net Return from nuclear fund -17 -10 -35 -31 -43 -47 Nuclear fund adjustment 3 -4 7 -4 -4 7 Unwinding of nuclear provisions 8 10 25 22 31 35 Fair value changes, impairments, reversals and other adjustments -1 1 -10 16 20 -7 Comparable finance costs – net -14 -14 -39 -40 -54 -54 Interest expenses on borrowings in I-III/2026 totalled EUR 101 million (I-III/2025: 126), including interest expenses on loans of EUR 103 million (I-III/2025: 114), and EUR -3 million (I-III/2025: 12) interest cost – net from derivatives hedging the loan portfolio. Interest income on loan receivables and deposits, EUR 54 million in I-III/2026 (I-III/2025: 82), includes EUR 37 million (I-III/2025: 67) from deposits and cash, and EUR 17 million (I-III/2025: 15) interest income from shareholder loan receivables and other loan receivables. Return from nuclear fund, nuclear fund adjustment and unwinding of nuclear provisions relate to the Loviisa nuclear power plant. 9 Income taxes EUR million III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Income tax expense -17 -7 -135 -117 -173 -191 Adjustments to income tax expense -5 -6 -6 -2 10 5 Comparable income tax expense -22 -13 -141 -119 -163 -186 The effective income tax rate according to the income statement in I-III/2026 was 19.4% (I-III/2025: 18.4%). The comparable effective income tax rate was 20.5% (I-III/2025: 18.8%). Fortum’s comparable effective income tax rate is impacted by the weight of the taxable profit in different jurisdictions and differences in standard nominal tax rates in these jurisdictions. Fortum Corporation Notes to the condensed consolidated interim financial statements January–September 2026 Interim Report 46
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10 Dividend per share A dividend for 2025 of EUR 0.74 per share, amounting to a total of EUR 664 million, was decided in the Annual General Meeting on 31 March 2026. The dividend was paid on 14 April 2026. A dividend for 2024 of EUR 1.40 per share, amounting to a total of EUR 1,256 million, was decided in the Annual General Meeting on 1 April 2025. The dividend was paid on 10 April 2025. 11 Interest-bearing receivables 30 Sep 2026 31 Dec 2025 EUR million Carrying amount Fair value 1) Carrying amount Fair value 1) Long-term loan receivables from associates and joint ventures 611 611 565 567 Total long-term interest-bearing receivables 611 611 565 567 Collateral arrangement 94 94 241 241 Collateral for default fund 0 0 87 87 Margin receivables 0 0 179 179 Other short-term interest-bearing receivables 81 81 32 32 Total short-term interest-bearing receivables 175 175 538 538 Total 786 786 1,104 1,105 1) Fair values do not include accrued interest. Long-term interest-bearing receivables from associated companies and joint ventures, EUR 611 million (31 Dec 2025: 565), include EUR 500 million (31 Dec 2025: 480) from Swedish nuclear companies, Forsmarks Kraftgrupp AB and OKG AB, which are mainly funded with shareholder loans, pro rata to each shareholder’s ownership. For more information on Finnish and Swedish nuclear related receivables, see Note 13 Nuclear-related assets and liabilities. Collateral for the default fund (31 Dec 2025: 87) and margin receivables for commodity futures (31 Dec 2025: 179) relate to trading with Nordic futures transferred to Euronext during I/2026. See Note 5 Financial risk management. 12 Interest-bearing net debt Net debt and financial net debt Following the transition of Nasdaq's power futures business to Euronext, Fortum has changed the reporting of net debt. The previously reported Financial net debt included interest-bearing loans (including collateral arrangement to Nasdaq), lease liabilities, margin receivables and liabilities, collateral arrangement receivable and liquid funds. From I/2026 onwards, Net debt is defined as interest-bearing loans, lease liabilities and liquid funds. Net debt is used as a component in the measure for capital structure 'Net debt to Comparable EBITDA' (previously 'Financial net debt to Comparable EBITDA'). The maximum level for 'Net debt to comparable EBITDA' remains unchanged at 2.5 times. See further information in Note 5 Financial risk management. Fortum Corporation Notes to the condensed consolidated interim financial statements January–September 2026 Interim Report 47
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EUR million 30 Sep 2026 31 Dec 2025 + Interest-bearing liabilities 4,136 4,746 - Liquid funds 2,325 2,903 Net debt 1,811 1,843 - Collateral arrangement 241 - Margin receivables 179 +Margin liabilities 55 +/- Net margin liabilities/receivables -124 Financial net debt 1,479 Interest-bearing liabilities EUR 4,136 million, include EUR 94 million drawn under Fortum´s collateral arrangement to fund initial margin at Euronext. Equalling amount is included in short-term interest-bearing receivables. Interest-bearing liabilities EUR million 30 Sep 2026 31 Dec 2025 Non-current loans 3,546 3,507 Current loans 494 1,133 Total loans 4,040 4,641 Non-current lease liabilities 79 87 Current lease liabilities 17 18 Total lease liabilities 96 105 Total 4,136 4,746 Loans 30 Sep 2026 31 Dec 2025 EUR million Carrying amount Fair value 3) Carrying amount Fair value 3) Bonds 1,969 1,956 2,750 2,770 Loans from financial institutions 362 362 379 379 Reborrowing from the Finnish State Nuclear Waste Management Fund 1) 1,039 1,040 951 951 Other long-term loans 193 194 195 194 Total long-term loans 2) 3,563 3,552 4,274 4,295 Collateral arrangement liabilities 94 94 360 360 Other short-term loans 383 383 6 6 Total short-term loans 477 477 366 366 Total 4,040 4,030 4,641 4,661 1) The reborrowing from the Finnish State Nuclear Waste Management Fund includes the part relating to Loviisa nuclear power plant as well as borrowing done through TVO. 2) Includes current portion of long-term liabilities of EUR 17 million (31 Dec 2025: 767). 3) Fair values do not include accrued interest. During the first quarter Fortum repaid the EUR 750 million maturing bond. Total current loans maturing within the next twelve months amount to EUR 494 million (31 Dec 2025: 1,133) and consist of short-term loans EUR 477 million and the current portion of long-term loans EUR 17 million. The average interest rate for the existing portfolio of EUR loans was 3.4% at the balance sheet date (31 Dec 2025: 3.0%). The average interest rate on total existing loans and derivatives was 3.4% at the balance sheet date (31 Dec 2025: 3.1%). Fortum Corporation Notes to the condensed consolidated interim financial statements January–September 2026 Interim Report 48
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Maturity of loans EUR million 30 Sep 2026 2026 253 2027 250 2028 512 2029 762 2030 305 2031 and later 1,959 Total 4,040 Maturities in 2026 include EUR 94 million loans with no contractual due date. Maturity of undiscounted lease liabilities EUR million 30 Sep 2026 Due within one year 19 Due after one year and within five years 40 Due after five years 58 Total 117 Liquid funds EUR million 30 Sep 2026 31 Dec 2025 Deposits and securities with maturity more than 3 months 75 33 Cash and cash equivalents 2,250 2,869 Total 2,325 2,903 At the end of the reporting period, the Group’s liquid funds totalled EUR 2,325 million (31 Dec 2025: 2,903), and of these funds EUR 2,240 million (31 Dec 2025: 2,773) are placed with counterparties that have an investment grade credit rating. The average interest rate for the liquid funds was 2.5% at the balance sheet date (31 Dec 2025: 2.1%). Committed credit facilities During the second quarter, Fortum signed a EUR 2,700 million revolving credit facility, which replaced the credit facility of EUR 2,206 million. The new facility has an initial maturity of five years, and Fortum may request two one-year extension options. Additionally, the EUR 800 million bilateral revolving credit facility with maturity in June 2027 was extended with one year to new maturity in June 2028. At the end of the reporting period, Fortum had undrawn committed credit facilities of EUR 4,300 million. These include the Core revolving credit facility, EUR 2,700 million, with maturity in April 2031 (Fortum may request two one-year extension options) and two EUR 800 million bilateral revolving credit facilities with maturity in June 2028 and January 2028. In addition, Fortum has EUR 100 million committed overdraft limits that are valid until further notice. 13 Nuclear-related assets and liabilities Fortum owns Loviisa nuclear power plant in Finland. On Fortum's consolidated balance sheet, Share in the State Nuclear Waste Management Fund and the Nuclear provisions relate to Loviisa nuclear power plant. Fortum also has minority interests in nuclear power companies, i.e. Teollisuuden Voima Oyj (TVO) in Finland and OKG Aktiebolag (OKG) and Forsmarks Kraftgrupp AB (Forsmark) in Sweden. The minority shareholdings are classified as associated companies and joint ventures and are consolidated with equity method. Both the Finnish and the Swedish companies are non-profit making, i.e. electricity production is invoiced to the owners at cost according to local GAAP. In Finland and Sweden nuclear operators are legally obligated for the decommissioning of the plants and the disposal of spent fuel (nuclear waste management). In both countries, the nuclear operators are obligated to secure the funding of nuclear waste management Fortum Corporation Notes to the condensed consolidated interim financial statements January–September 2026 Interim Report 49
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by paying to government managed nuclear waste funds. The nuclear operators also have to give securities to guarantee that sufficient funds exist to cover future expenses of decommissioning of the power plant and the disposal of spent fuel. 13.1 Nuclear-related assets and liabilities for consolidated nuclear power plants EUR million 30 Sep 2026 31 Dec 2025 Carrying values on the balance sheet Nuclear provisions 1,174 1,153 Fortum's share in the State Nuclear Waste Management Fund 1,174 1,153 Short-term receivable from the State Nuclear Waste Management Fund 0 7 Fortum's contribution to the State Nuclear Waste Management Fund 1,264 1,228 Share of fund not recognised on the balance sheet 90 69 Nuclear provision and fund accounted for according to IFRS Accounting Standards Nuclear provisions include the provision for the decommissioning and the provision for the disposal of spent fuel. Provisions are based on the total cost estimate in which future costs are discounted to net present value. The carrying value of nuclear provisions, calculated according to IAS 37, increased by EUR 21 million compared to 31 December 2025, totalling EUR 1,174 million at 30 September 2026. Fortum's share of the State Nuclear Waste Management Fund is from an IFRS Accounting Standards perspective overfunded by EUR 90 million, since Fortum's share of the Fund on 30 September 2026 was EUR 1,264 million and the carrying value on the balance sheet was EUR 1,174 million. The Fund on Fortum's balance sheet can at maximum be equal to the amount of the provisions according to IFRS Accounting Standards. As long as the Fund is overfunded from an IFRS Accounting Standards perspective, other financial items are adjusted positively if the provisions increase more than the Fund, and negatively if the provision decreases below the actual value of the Fund. Legal liability for Loviisa nuclear power plant The legal liability on 30 September 2026, decided by the Ministry of Economic Affairs and Employment in December 2025, was EUR 1,290 million. The legal liability is based on a cost estimate, which is updated every three years; and a technical plan, which is also updated every three years. The legal liability is determined by assuming that the decommissioning would start at the beginning of the year following the assessment year and discounting is not applied in determining the amount. Fortum's share in the Finnish Nuclear Waste Management Fund According to the Nuclear Energy Act, Fortum is obligated to contribute funds in full to the State Nuclear Waste Management Fund to cover the legal liability. Fortum contributes funds to the Finnish State Nuclear Waste Management Fund based on the yearly funding obligation target decided by the governmental authorities in connection with the decision of size of the legal liability. The current funding obligation target decided in December 2025 is EUR 1,264 million. Responsibility for the costs relating to decommissioning of the encapsulation plant and closure of the final disposal repository were transferred to Posiva in 2025. The change decreased Fortum's funding target and nuclear liability. Posiva is jointly owned by Fortum and TVO. Borrowing from the State Nuclear Waste Management Fund Participants in the Finnish State Nuclear Waste Management Fund are allowed to borrow from the Fund according to certain rules. Fortum uses the right to borrow back and has pledged shares in Kemijoki Oy as security for the loans. The loans are renewed every three years. See Note 12 Interest-bearing net debt and Note 15 Pledged assets and contingent liabilities. 13.2 Nuclear power plants in associated companies and joint ventures OKG, Forsmark and TVO are non-profit making companies, i.e. electricity production is invoiced to the owners at cost. Invoiced cost is accounted according to local GAAP. In addition to the invoiced electricity production cost, Fortum makes IFRS Accounting Standards Fortum Corporation Notes to the condensed consolidated interim financial statements January–September 2026 Interim Report 50
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adjustments to comply with Fortum's accounting principles. These adjustments include also Fortum's share of the companies' nuclear waste funds and nuclear provisions. The tables below present the 100% figures relating to nuclear funds and provisions for the companies as well as Fortum's net share. TVO's total nuclear-related assets and liabilities (100%) EUR million 30 Sep 2026 31 Dec 2025 Carrying values in TVO with Fortum assumptions Nuclear provisions 1,719 1,701 Share of the State Nuclear Waste Management Fund 1,308 1,293 Net amount -410 -408 of which Fortum's net share consolidated with equity method -103 -102 TVO's legal liability and actual share of the State Nuclear Waste Management Fund Liability for nuclear waste management according to the Nuclear Energy Act 1,882 1,882 Share in the State Nuclear Waste Management Fund 1,496 1,438 Share of the fund not recognised on the balance sheet 188 145 of which OL1/OL2 overfunded 220 197 of which OL3 underfunded -33 -52 TVO's legal liability, provision and share of the fund are based on same principles as described above for Loviisa nuclear power plant. The liabilities and shares in the Fund are calculated and recorded separately for OL1/OL2 plant units and OL3 plant unit, as the corresponding total cost estimates are prepared separately. The difference between TVO's share in the State Nuclear Waste Management Fund and the carrying value of the TVO's share in the Fund is due to IFRIC 5, which requires that the carrying amount of the share in the State Nuclear Waste Management Fund is the lower of fair value or the value of the related liability. On 30 September 2026, the OL1/OL2 plant units' share in the Fund is higher than the provision according to IFRS Accounting Standards. The OL3 plant unit's share in the Fund is on the other hand lower than the provision according to IFRS Accounting Standards. TVO's share of the Finnish State Nuclear Waste Management Fund is from an IFRS Accounting Standards perspective overfunded by EUR 188 million (of which Fortum's share is EUR 50 million), since TVO's share of the Fund on 30 September 2026 was EUR 1,496 million and the carrying value on the consolidated balance sheet with Fortum assumptions was EUR 1,308 million. At 30 September 2026, Fortum had EUR 157 million (31 Dec 2025: 157) shareholder loan receivable from TVO. The amount expected to be recovered within twelve months is classified as current receivables, with the remainder classified as participation in joint ventures. Participants in the Finnish State Nuclear Waste Management Fund are allowed to borrow from the fund according to certain rules. Fortum is using the right to reborrow funds through TVO based on its ownership. See more information in Note 12 Interest-bearing net debt. OKG’s and Forsmark’s total nuclear-related assets and liabilities (100%) EUR million 30 Sep 2026 31 Dec 2025 OKG's and Forsmark's nuclear-related assets and liabilities with Fortum assumptions Nuclear provisions 5,214 5,475 Share in the Swedish Nuclear Waste Fund 3,836 3,949 Net amount -1,379 -1,526 of which Fortum's net share consolidated with equity method -443 -484 In Sweden, Svensk Kärnbränslehantering AB (SKB), a company owned by the nuclear operators, takes care of all nuclear waste management-related activities on behalf of nuclear operators. SKB receives its funding from the Swedish Nuclear Waste Fund, which in turn is financed by the nuclear operators. Nuclear waste fees and guarantees are normally updated every three years by governmental decision after a proposal from the National Debt Office (Riksgälden). The proposal is based on cost estimates done by SKB and the license holders. An updated technical plan for nuclear waste management was decided by SKB in December 2022 and it is the base for nuclear fees during 2024–2026. Nuclear waste fees paid by licensees with a unit/units that are still in operation are from 2026 based on future costs with the assumed lifetime of 60 years for each unit of a nuclear power plant. Until 2025 the assumed lifetime was 50 years. The fee is calculated in relation to the energy delivered. An updated technical plan and cost estimate was handed in by SKB to the National Debt Office on 30 September 2025. This updated cost estimate covers cost from 2027 and onwards and will be the basis for nuclear waste fees and guarantees from 2027 and Fortum Corporation Notes to the condensed consolidated interim financial statements January–September 2026 Interim Report 51
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onwards. The nuclear provision (which is included in Fortum’s net share consolidated with equity method) reflects the updated technical plan. 14 Capital and other commitments Capital and other commitments are contractual or regulatory obligations that are not recognised as liabilities on the balance sheet, or disclosed as contingent liabilities. At 30 September 2026, Fortum had EUR 444 million (31 Dec 2025: 448) capital commitments for capital expenditure of property, plant and equipment and intangible assets. For more information on other commitments, see Note 35 Capital and other commitments of the consolidated financial statements 2025. 15 Pledged assets and contingent liabilities Fortum has issued direct and indirect guarantees and warranties on own behalf and on behalf of associated companies and joint ventures, which may obligate Fortum to make payments on the occurrence of certain events. For the Swedish nuclear companies there are two types of guarantees given. The Financing Amount is given to cover Fortum's share of the uncovered part in the Nuclear Waste Fund, assuming no further production and that no further nuclear waste fees are paid in. The uncovered amount is calculated by the authorities and is based on the difference between the expected costs and the funds to cover these costs at the time of the calculation. The Supplementary Amount constitutes a guarantee for deficits that can arise as a result of unplanned events. The guarantee given on behalf of Teollisuuden Voima Oyj to the Ministry of Economic Affairs and Employment amounts to EUR 152 million (31 Dec 2025: 149). The guarantee covers the unpaid legal liability due to periodisation, as well as risks for unexpected future costs. Guarantees given on behalf of Posiva Oy to cover Posiva's share of the costs of decommissioning the encapsulation plant and closure of the disposal facility amounts to EUR 10 million (31 Dec 2025: 7). Posiva is jointly owned by Fortum and TVO. For more information, see Note 13 Nuclear-related assets and liabilities. Further, Fortum has pledged shares in Kemijoki Oy as a security for the reborrowing from the Finnish State Nuclear Waste Management Fund for the Loviisa nuclear power plant part, amounting to EUR 783 million (31 Dec 2025: 718). Fortum has also pledged real estate mortgages in Pyhäkoski hydro plant as security for the uncovered part of the legal nuclear liability to the Ministry of Economic Affairs and Employment amounting to EUR 183 million (31 Dec 2025: 122). Margin requirements from commodity exchanges are fulfilled with an arrangement with clearing bank or with restricted cash presented in short-term interest-bearing receivables (see Note 11 Interest-bearing receivables). At 31 Dec 2025 Fortum had posted EUR 87 million as collateral toward Nasdaq Clearing AB covering Fortum’s required contribution to the Commodity Market Default Fund (default fund). Following the transition of Nasdaq power futures business to Euronext, the collateral was released. For more information, see Note 36 Pledged assets and contingent liabilities in the consolidated financial statements 2025. 16 Legal actions and official proceedings Various routine court actions, arbitration proceedings, tax and regulatory investigations and proceedings are currently pending against entities of the Group, and further actions or proceedings may be instituted or asserted in the future. For more information, see Note 37 Legal actions and official proceedings in the consolidated financial statements 2025. Fortum Corporation Notes to the condensed consolidated interim financial statements January–September 2026 Interim Report 52
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17 Related party transactions Related parties are described in more detail in Note 38 Related party transactions in the consolidated financial statements for the year ended 31 December 2025. Transactions with associates and joint ventures EUR million III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Sales 3 3 10 6 8 13 Purchases 148 143 448 434 576 590 Interest income on loan receivables 6 5 17 14 19 22 Interest expense on loan payables 2 2 6 6 8 8 Balances with associates and joint ventures EUR million 30 Sep 2026 31 Dec 2025 Receivables Long-term interest-bearing loan receivables 611 565 Trade and other receivables 23 26 Liabilities Long- and short-term loan payables 256 232 Trade and other payables 40 50 Other transactions with related parties At the end of 2025, the Finnish State owned 51.26% of Fortum's shares. There has been no change in the number of shares the Finnish State owns in Fortum during 2026. Meri-Pori power plant has been reserved under an agreement with the National Emergency Supply Agency (NESA) as a reserve for severe disruption and emergencies to guarantee security of supply in the electricity system in Finland. The agreement period is from 1 April 2024 until 31 December 2026. Fortum Corporation Notes to the condensed consolidated interim financial statements January–September 2026 Interim Report 53
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18 Events after the balance sheet date On 23 October, Fortum announced that it had settled the voluntary cash tender offer for all issued and outstanding shares in Elmera Group ASA, except for shares owned by Elmera, for NOK 47 per share corresponding to a total consideration of approximately EUR 463 million (NOK 4,940 million). Following settlement of the offer, Fortum has acquired control and holds 105,108,968 shares, representing approximately 91.92% of Elmera’s issued and outstanding share capital and voting rights (96.12% excluding Elmera's treasury shares). Elmera will included in the Consumer Solutions segment with consolidation expected from 31 October onwards. As the acquisition was completed after the reporting date, the initial accounting for the acquisition has not yet been completed. Fortum will provide further details on Elmera’s consolidation, including the purchase price allocation, in the Financial Statements Bulletin for 2026. Following completion of the offer, Fortum intends to carry out a compulsory acquisition of the remaining shares not owned by Fortum or Elmera, which is expected to be completed in the coming weeks. Following the compulsory acquisition, Fortum intends to pursue a delisting of Elmera’s shares from Euronext Oslo Børs. 2025 Elmera 1) Fortum Consumer Solutions NOK million EUR million Sales 12,118 3,029 Adjusted/comparable EBITDA 2) 738 213 1) The figures are based on Elmera Group ASA’s Financial Statements for 2025. 2) Fortum and Elmera have different definitions for Alternative performance measures. 2025 Elmera 1) Fortum Consumer Solutions Electricity sales volume, TWh 16.0 33.7 Number of electricity customers, thousands 915 2,250 Number of employees 433 1,134 1) The figures are based on Elmera Group ASA’s Financial Statements for 2025. Fortum Corporation Notes to the condensed consolidated interim financial statements January–September 2026 Interim Report 54
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19 Definitions and reconciliations of key figures Alternative performance measures Business performance Definition Reason to use the measure Reference to reconciliation Comparable EBITDA Operating profit + depreciations and amortisations - items affecting comparability Comparable EBITDA is representing the underlying cash flow generated by the total Group and segments. Used as a component in the capital structure target of Financial net debt to Comparable EBITDA. Key ratios after cash flow statement Comparable operating profit Operating profit - items affecting comparability Comparable operating profit is used in financial target setting and forecasting, management's follow up of financial performance and allocation of resources in the group's performance management process. Income statement Items affecting comparability Impairment charges and reversals + capital gains and other related items + changes in fair values of derivatives hedging future cash flow + other Component used in calculating comparable operating profit and comparable EBITDA. Income statement Impairment charges and reversals Impairment charges and related provisions (mainly dismantling), as well as the reversal of previously recorded impairment charges. Impairment charges are adjusted from depreciation and amortisation, and reversals from other income. Component used in calculating comparable operating profit and comparable EBITDA. Income statement Capital gains and other related items Capital gains and transaction costs from acquisitions, which are adjusted from other income and other expenses respectively. Profits are reported in comparable operating profit, if this reflects the business model. Component used in calculating comparable operating profit and comparable EBITDA. Income statement Changes in fair values of derivatives hedging future cash flow Effects from financial derivatives hedging future cash flows where hedge accounting is not applied or own use exemption cannot be used according to IFRS 9 and are adjusted from other income or expense to sales and materials and services respectively when calculating Fortum's alternative performance measures. Component used in calculating comparable operating profit and comparable EBITDA. Income statement Other Restructuring and cost management expenses, and other miscellaneous non- operating items, which are adjusted mainly from materials and services or other expenses. Component used in calculating comparable operating profit and comparable EBITDA. Income statement Fortum Corporation Notes to the condensed consolidated interim financial statements January–September 2026 Interim Report 55
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Business performance Definition Reason to use the measure Reference to reconciliation Comparable share of profit/ loss of associates and joint ventures Share of profit/loss of associates and joint ventures +/- significant adjustments for share of profit /loss in associates and joint ventures. Component used in calculating comparable net profit and comparable return on net assets. Note 4 Comparable operating profit and comparable net profit Comparable finance costs – net Finance costs – net +/- return from nuclear funds, nuclear fund adjustment and unwinding of nuclear provisions +/- fair value changes on financial items +/- impairment charges and reversals of previously recorded impairment charges on financial items and other one-time adjustments. Component used in calculating comparable net profit. Note 4 Comparable operating profit and comparable net profit Comparable profit before income tax Comparable operating profit +/- comparable share of profit/loss of associates and joint ventures +/- comparable finance costs – net. Subtotal in comparable net profit calculation. Note 4 Comparable operating profit and comparable net profit Comparable income tax expense Income tax expense excluding taxes on items affecting comparability, adjustments to finance costs – net, tax rate changes and other one-time adjustments. Component used in calculating comparable net profit. Note 4 Comparable operating profit and comparable net profit Comparable net profit Comparable operating profit +/- comparable share of profit/loss of associates and joint ventures +/- comparable finance costs - net +/- comparable income tax expense +/- comparable non-controlling interests. Comparable net profit is used to provide additional financial performance indicators to support meaningful comparison of underlying net profitability between periods. Note 4 Comparable operating profit and comparable net profit Comparable earnings per share Comparable net profit Comparable earnings per share is used to provide additional financial performance indicators to support meaningful comparison of underlying net profitability between periods. Note 4 Comparable operating profit and comparable net profitAverage number of shares during the period Comparable return on net assets (RONA), % Comparable operating profit + comparable share of profit /loss of associates and joint ventures x 100 Comparable return on net assets is used in financial target setting and forecasting, management's follow up of financial performance and allocation of resources in the group's performance management process. Note 3 Segment information Comparable net assets average Comparable net assets Non-interest-bearing assets - non- interest-bearing liabilities - provisions (non-interest-bearing assets and liabilities do not include finance- related items, tax and deferred tax and assets and liabilities from fair valuations of derivatives used for hedging future cash flows). Comparable net assets is a component in Comparable return on net assets calculation where return on capital allocated directly to the businesses is measured. Note 3 Segment information Fortum Corporation Notes to the condensed consolidated interim financial statements January–September 2026 Interim Report 56
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Capital structure Definition Reason to use the measure Reference to reconciliation Net debt / comparable EBITDA Net debt Net debt to Comparable EBITDA is Fortum’s long-term financial target measure for capital structure. Key ratios after cash flow statementComparable EBITDA Net debt Interest-bearing liabilities - liquid funds Net debt is used in the follow-up of the indebtedness of the group and it is a component in the capital structure target of Net debt to Comparable EBITDA. Note 12 Interest-bearing net debt Financial net debt / comparable EBITDA Financial net debt Financial net debt to Comparable EBITDA was Fortum’s long-term financial target measure for capital structure until 31 December 2025. Comparable EBITDA Financial net debt Interest-bearing liabilities - liquid funds - securities in interest-bearing receivables +/- net margin liabilities/receivables Financial net debt was used in the follow- up of the indebtedness of the group and it is a component in the capital structure target of Financial net debt to Comparable EBITDA until 31 December 2025. Other key figures Share based key figures Earnings per share (EPS) Profit for the period - non-controlling interests Average number of shares during the period Equity per share Shareholder's equity Number of shares at the end of the period Other key figures Capital expenditure Capitalised investments in property, plant and equipment and intangible assets including maintenance, productivity, growth and investments required by legislation including borrowing costs capitalised during the construction period. Maintenance investments expand the lifetime of an existing asset, maintain usage/ availability and/or maintains reliability. Productivity investments improve productivity in an existing asset. Growth investments' purpose is to build new assets and/or to increase customer base within existing businesses. Legislation investments are done at certain point of time due to legal requirements. Gross investments in shares Investments in subsidiary shares, shares in associated companies and joint ventures and other investments. Investments in subsidiary shares are net of liquid funds and grossed with interest-bearing liabilities and other items included in financial net debt in the acquired company. Last twelve months (LTM) Twelve months preceding the reporting date. Tax key figures Effective income tax rate, % Income tax expense x 100Profit before income tax Comparable effective income tax rate, % Comparable income tax expense x 100Comparable profit before income tax excluding comparable share of profit/loss of associated companies and joint ventures Fortum Corporation Notes to the condensed consolidated interim financial statements January–September 2026 Interim Report 57
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Reconciliations of alternative performance measures Comparable EBITDA EUR million Note III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Operating profit 72 60 699 634 939 1,004 + Depreciation and amortisation 80 78 239 230 315 324 EBITDA 152 138 937 864 1,254 1,328 - Items affecting comparability 4 30 36 30 40 -15 -25 Comparable EBITDA 182 175 967 903 1,240 1,303 Comparable operating profit EUR million Note III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Operating profit 72 60 699 634 939 1,004 - Items affecting comparability 4 30 36 30 40 -15 -25 Comparable operating profit 4 102 97 729 674 924 979 Comparable return on net assets EUR million Note LTM 31 Dec 2025 Comparable operating profit 979 924 Comparable share of profit of associates and joint ventures 4, 7 9 28 Comparable operating profit including comparable share of profit/loss of associates and joint ventures 988 952 Segment assets at the end of the period 9,818 10,054 Segment liabilities at the end of the period 771 905 Comparable net assets 9,047 9,150 Comparable net assets average 1) 9,040 8,746 Comparable return on net assets (RONA), % 10.9 10.9 1) Average net assets are calculated using the opening balance of the financial year and each quarter's closing value. Items affecting comparability EUR million Note III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Impairment charges and reversals 0 0 0 -21 -25 -4 Capital gains and other related items -2 0 0 -3 -4 -1 Changes in fair values of derivatives hedging future cash flow -26 -37 -28 -14 47 32 Other -1 0 -1 -2 -3 -3 Items affecting comparability 4 -30 -36 -30 -40 15 25 Comparable net profit EUR million Note III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Net profit 28 51 561 519 763 805 - Items affecting comparability 4 30 36 30 40 -15 -25 - Adjustments to share of profit/loss of associates and joint ventures 7 19 -9 -30 -31 -27 -26 - Adjustments to finance costs - net 8 -7 -3 -12 4 4 -12 - Adjustments to income tax expenses 9 -5 -6 -6 -2 10 5 - Non-controlling interests 3 1 0 1 2 1 - Adjustments to non-controlling interests -3 1 1 2 1 1 Comparable net profit 4 65 70 544 531 739 751 Fortum Corporation Notes to the condensed consolidated interim financial statements January–September 2026 Interim Report 58
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Comparable earnings per share Note III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Comparable net profit, EUR million 4 65 70 544 531 739 751 Average number of shares during the period, 1,000 shares 897,264 897,264 897,264 897,264 897,264 897,264 Comparable earnings per share, EUR 0.08 0.08 0.61 0.59 0.82 0.84 Net debt and financial net debt EUR million Note 30 Sep 2026 31 Dec 2025 + Interest-bearing liabilities 4,136 4,746 - Liquid funds 2,325 2,903 Net debt 12 1,811 1,843 - Collateral arrangement 241 - Margin receivables 179 +Margin liabilities 55 +/- Net margin liabilities/receivables -124 Financial net debt 1,479 Net debt/comparable EBITDA EUR million Note LTM 2025 + Interest-bearing liabilities 4,136 4,746 - Liquid funds 2,325 2,903 Net debt 12 1,811 1,843 - Collateral arrangement 241 - Margin receivables 179 +Margin liabilities 55 +/- Net margin liabilities/receivables -124 Financial net debt 1,479 Operating profit 1,004 939 + Depreciation and amortisation 324 315 EBITDA 1,328 1,254 - Items affecting comparability -25 -15 Comparable EBITDA 1,303 1,240 Net debt/comparable EBITDA 1.4 1.5 Financial net debt/comparable EBITDA N/A 1.2 Fortum Corporation Notes to the condensed consolidated interim financial statements January–September 2026 Interim Report 59
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Market conditions and achieved power prices Power consumption TWh III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Nordic countries 85 84 297 288 395 404 Current quarter figures are preliminary statistics and may be revised. Final figures are disclosed in the comparatives. Average prices III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Spot price for power in Nord Pool power exchange, EUR/MWh 74.4 36.0 77.5 36.0 39.7 70.7 Spot price for power in Finland, EUR/MWh 37.7 40.4 59.7 39.2 40.5 55.8 Spot price for power in Sweden, SE3, Stockholm EUR/MWh 62.0 41.3 70.8 43.0 46.2 67.1 Spot price for power in Sweden, SE2, Sundsvall EUR/MWh 33.7 16.6 45.8 13.9 16.5 40.3 Spot price for power in Germany, EUR/MWh 125.5 82.8 107.7 88.0 89.3 104.0 CO2, (ETS EUA next Dec), EUR/tonne CO2 83 73 79 73 75 80 Coal (ICE Rotterdam front month), USD/tonne 144 100 117 101 100 111 Oil (Brent front month), USD/bbl 91 68 89 70 68 82 Gas (TTF front month), EUR/MWh 64 33 50 38 36 45 Hydro reservoir TWh 30 Sep 2026 30 Sep 2025 31 Dec 2025 Nordic hydro reservoir level 88 89 90 Nordic hydro reservoir level, long-term average 101 84 84 Export/import TWh (+ = import to, - = export from Nordic area) III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Export / import between Nordic area and Continental Europe + Baltics -5 -9 -12 -29 -40 -23 Current quarter figures are preliminary statistics and may be revised. Final figures are disclosed in the comparatives. Achieved power prices EUR/MWh III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Generation segment's Nordic achieved power price 45.5 46.1 52.1 52.3 51.4 51.3 Fortum Corporation Market conditions and achieved power prices January–September 2026 Interim Report 60
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Fortum's production and sales volumes Power generation TWh III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Nordic countries 9.8 9.0 32.0 30.0 41.8 43.7 Other European countries 0.0 0.1 0.3 0.4 0.6 0.5 Total 9.8 9.1 32.3 30.4 42.3 44.2 Heat production TWh III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Nordic countries 0.3 0.2 1.8 1.4 2.0 2.4 Other European countries 0.1 0.1 0.8 0.8 1.2 1.3 Total 0.4 0.3 2.6 2.1 3.2 3.7 Power generation capacity by segment MW 30 Sep 2026 31 Dec 2025 Generation 1) 9,312 9,296 1) Including Meri-Pori power plant capacity 565 MW. The production of the Meri-Pori power plant is reserved for severe disruption and emergencies under an agreement with the National Emergency Supply Agency until the end of 2026, after which the plant will be permanently closed as of 1 March 2027. For more information, see Note 17 Related party transactions. Heat production capacity by segment MW 30 Sep 2026 31 Dec 2025 Generation 2,109 2,060 Power generation by source in the Nordic area TWh III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Hydropower 4.0 4.2 14.3 13.2 18.5 19.6 Nuclear power 5.6 4.6 16.9 16.0 22.1 22.9 Wind power 0.2 0.2 0.6 0.7 1.0 0.9 CHP and condensing power 0.0 0.0 0.2 0.1 0.1 0.3 Total 9.8 9.0 32.0 30.0 41.8 43.7 Power generation by source in the Nordic area % III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Hydropower 41 47 45 44 44 45 Nuclear power 58 51 53 53 53 52 Wind power 2 2 2 2 2 2 CHP and condensing power 0 0 1 0 0 1 Total 100 100 100 100 100 100 Power generation by source in other European countries TWh III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM CHP 0.0 0.1 0.3 0.4 0.6 0.5 Fortum Corporation Production and sales volumes January–September 2026 Interim Report 61
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Power sales EUR million III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Nordic countries 726 579 2,856 2,273 3,183 3,766 Other European countries 222 188 625 549 756 832 Total 949 767 3,481 2,822 3,939 4,598 Heat sales EUR million III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Nordic countries 23 19 133 108 154 180 Other European countries 46 44 276 247 379 408 Total 69 64 409 355 533 587 Power sales by area TWh III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Finland 4.8 4.6 16.2 15.5 21.5 22.2 Sweden 5.5 5.2 16.7 16.9 23.3 23.0 Norway 1.8 1.9 7.8 7.8 10.8 10.8 Other countries 1.6 1.4 4.6 4.1 5.7 6.2 Total 13.7 13.1 45.2 44.3 61.3 62.2 Nord Pool transactions are calculated as a net amount of sales and purchases for any particular 15 minutes or hour at the Group level. Heat sales by area TWh III/2026 III/2025 I-III/2026 I-III/2025 2025 LTM Finland 0.3 0.2 1.7 1.3 1.9 2.3 Poland 0.2 0.2 2.4 2.2 3.6 3.7 Total 0.5 0.4 4.1 3.5 5.4 6.0 Fortum Corporation Production and sales volumes January–September 2026 Interim Report 62