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Eos Energy Enterprises Q3 2026 Financial Results November 5, 2026
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Disclaimer 2 Forward-Looking Statements This presentation includes “forward-looking statements” within the meaning of the “safe harbor” provisions of the Private Securities Litigation Reform Act of 1995. Forward-looking statements include, but are not limited to, statements regarding our expected revenue for the fiscal year ending December 31, 2026, our path to profitability and strategic outlook, statements regarding orders, backlog and opportunity pipeline, statements regarding the joint venture, the transactions related thereto, and any anticipated benefits of the joint venture, statements regarding our expectation that we can continue to increase product volume on our state-of-the-art manufacturing lines, statements regarding our future expansion and its impact on our ability to scale up operations and increase margins, statements regarding the expected impact of DawnOS® on efficiency, operating costs and grid coordination, statements regarding the launch of Indensity and our expectations for the architecture and its expected energy density, statements regarding our expectation that we can continue to strengthen our overall supply chain, statements regarding related-party transactions and revenue contributions, the timing and execution of manufacturing consolidation activities, Line 1 disassembly, relocation, upgrade, recommissioning and ramp-up, Thorn Hill shift staffing and utilization, expected production capacity, and the timing of customer project deployments, including the MN8 Energy and Google project, statements that refer to outlook, projections, forecasts or other characterizations of future events or circumstances, including any underlying assumptions. The words “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intend,” “may,” “might,” “plan,” “possible,” “potential,” “predict,” “project,” “should,” “would” and similar expressions may identify forward-looking statements, but the absence of these words does not mean that a statement is not forward-looking. Forward-looking statements are based on our management’s beliefs, as well as assumptions made by, and information currently available to them. Because such statements are based on expectations as to future financial and operating results and are not statements of fact, actual results may differ materially from those projected. Factors which may cause actual results to differ materially from current expectations include, but are not limited to: changes adversely affecting the business in which we are engaged; our ability to forecast trends accurately; our ability to generate cash, service indebtedness and incur additional indebtedness; our ability to raise financing in the future; our ability to obtain stockholder approval of an increase in our authorized common stock; risks associated with the joint venture, including the risk that the joint venture will not be completed on the anticipated timeline or terms, or at all, and risks associated with FPUSA’s ability to develop, finance, construct and monetize projects; risks associated with the credit agreement with Cerberus, including risks of default and dilution of outstanding common stock; our customers’ ability to secure project financing; the amount of final tax credits available to our customers or to Eos pursuant to the Inflation Reduction Act, including potential impacts from any repeal or modification of the legislation; the timing and availability of future funding under the Department of Energy Loan Facility; risks associated with the successful execution and expected benefits of any manufacturing consolidation initiatives; our ability to continue to develop efficient manufacturing processes to scale and to forecast related costs and efficiencies accurately; fluctuations in our revenue and operating results; competition from existing or new competitors; our ability to convert firm order backlog and pipeline to revenue; risks associated with security breaches in our information technology systems; risks related to legal proceedings or claims; risks associated with evolving energy policies in the United States and other countries and the potential costs of regulatory compliance; risks associated with changes to the U.S. trade environment; our ability to maintain the listing of our shares of common stock on NASDAQ; our ability to grow our business and manage growth profitably, maintain relationships with customers and suppliers and retain our management and key employees; risks related to adverse changes in general economic conditions, including inflationary pressures and increased interest rates; risk from supply chain disruptions and other impacts of geopolitical conflict; changes in applicable laws or regulations; the possibility that Eos may be adversely affected by other economic, business, and/or competitive factors; other factors beyond our control; other risks and uncertainties indicated in the company’s most recent annual report on Form 10-K and subsequent reports on Forms 10-Q and 8-K, including those under the heading “Risk Factors” therein, and other factors identified in Eos’s prior and future SEC filings with the SEC, available at www.sec.gov; and risks related to related-party revenue and project-financing arrangements, including FPUSA-related considerations; the timing and outcome of Line 1 disassembly, relocation, recommissioning and ramp-up; staffing and training for full-shift Thorn Hill operations; production interruptions, cost absorption and customer delivery schedules during the consolidation period; and the ability of MN8 Energy, Google and other project counterparties to develop, finance, construct and place projects into commercial operation on expected timelines or at all. Eos cautions that the foregoing list of factors is not exclusive and cautions investors not to place undue reliance upon any forward-looking statements, which speak only as of the date made. Should one or more of these risks or uncertainties materialize or should any of our assumptions prove incorrect, actual results may vary in material respects from those projected in these forward-looking statements. Eos does not undertake or accept any obligation to release publicly any updates or revisions to any forward-looking statements to reflect any change in its expectations or any change in events, conditions or circumstances on which any such statement is based, except as required by law. Industry and Market Data In this presentation, we rely on and refer to information and statistics regarding market participants in the sectors in which Eos competes and other industry data. We obtained this information and statistics from third-party sources, including reports by market research firms and company filings. We have not independently verified the accuracy or completeness of such third-party information, including the data included in this presentation, and disclaim any liability with respect to such third-party sources and data. Trademarks This presentation may contain trademarks, service marks, trade names and copyrights of other companies, which are the property of their respective owners. Solely for convenience, some of the trademarks, service marks, trade names and copyrights referred to in this presentation may be listed without the TM, SM © or ® symbols, but Eos will assert, the fullest extent under applicable law, the rights of the applicable owners, if any, to these trademarks, service marks, trade names and copyrights. Znyth, Eos Znyth, Eos Z3, DawnOS, Indensity, and Indensity Core are trademarks of Eos Energy Technology Holdings, LLC, wholly owned subsidiary of Eos Energy Enterprises, Inc.
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Disclaimer 3 Key Metrics Backlog. Our backlog represents the amount of revenue that we expect to realize from existing agreements with our customers for the sale of our battery energy storage systems and performance of services. The backlog is calculated by adding new orders in the current fiscal period to the backlog as of the end of the prior fiscal period and then subtracting the shipments in the current fiscal period. If the amount of an order is modified or cancelled, we adjust orders in the current period and our backlog accordingly, but do not retroactively adjust previously published backlogs. There is no comparable US-GAAP financial measure to backlog. We believe that the backlog is a useful indicator regarding the future revenue of our Company. Pipeline. Our pipeline represents projects for which we have submitted technical proposals or non-binding quotes plus customers with letters of intent (“LOI”) or firm commitments. Pipeline does not include lead generation projects. Booked Orders. Booked orders are orders where we have legally binding agreements with a Purchase Order (“PO”) or Master Supply Agreement (“MSA”) executed by both parties. Non-GAAP Financial Measures To provide investors with additional information regarding our financial results, we have disclosed in this earnings presentation certain non-GAAP financial measures, including adjusted EBITDA, adjusted EBITDA margin, adjusted gross profit (loss), adjusted gross margin, product adjusted gross profit (loss) and product adjusted gross margin. These non-GAAP financial measures should be considered supplemental to, and not a substitute for or superior to, financial measures calculated in accordance with U.S. generally accepted accounting principles (“GAAP”). The Company believes adjusted EBITDA, adjusted EBITDA margin, adjusted gross profit (loss), adjusted gross margin, product adjusted gross profit (loss) and product adjusted gross margin are useful measures in evaluating our financial and operational performance distinct from financing costs, certain non-cash expenses and non-operational expenses. We believe that non-GAAP financial information, when taken collectively with GAAP results, may be helpful to investors in assessing our operating performance. There are a number of limitations related to the use of these non-GAAP financial measures and their nearest GAAP equivalents. For example, the Company’s definitions of non-GAAP financial measures may differ from similarly titled measures used by other companies. You should review the reconciliations included in this presentation and should not rely on any single financial measure to evaluate our business. Adjusted EBITDA is defined as net income (loss) attributable to Eos adjusted for interest expense, income tax expense, depreciation and amortization, non-cash stock-based compensation expense, change in fair value of debt and derivatives, debt extinguishment, restructuring expenses, and other non-cash or non-recurring items that management does not believe are indicative of underlying business trends. Adjusted gross profit (loss) is defined as gross profit (loss) adjusted to exclude stock-based compensation, depreciation and amortization. Product adjusted gross profit (loss) is defined as gross profit (loss) attributable to our battery energy storage system products, adjusted to exclude stock-based compensation, depreciation and amortization. Adjusted EBITDA margin, adjusted gross margin and product adjusted gross margin are calculated as the applicable non-GAAP measure divided by revenue or applicable product revenue, as relevant. The Company has not provided reconciliations of forward-looking adjusted gross margin, product adjusted gross profit (loss) or product adjusted gross margin to the most directly comparable GAAP measures because the reconciling items necessary to estimate GAAP gross profit and gross margin on a forward-looking basis are not available without unreasonable efforts.
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4 Operating Highlights (1) Numbers shown as of 9/30/2026 (2) For the three months ended 9/30/2026 (3) Adjusted EBITDA margin is a non-GAAP measure; see Slide 9 and Appendix for GAAP results and reconciliation. (4) Includes cash equivalents and restricted cash Q3 Revenue2 $82.7 million 171% increase vs. Q3 ‘25 Backlog1 $765 million 19% increase vs. Q3 ‘25 Cubes Shipped2 + 216 % vs. Q3 ‘25 Adj. EBITDA Margin2,3 +96 pts. vs. Q3 ‘25 Discharge Energy 6 .9 GWh ~79% RTE across Z3 fleet Total Cash1,4 $344 million 171% increase vs. Q3 ‘25
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Growing Field Experience & Advancing System Performance DawnOS® controls optimizing capacity and round-trip efficiency Discharged Energy Z3 Metrics Cumulative 6.9 GWh ~4.0m Cycles Eos Z3 0.9 GWh ~1.2m Cycles RTE 72% - 91% Avg. 79% 20-100-20 SoC Includes Non DawnOS/DawnOS Duration 2 -14 hrs. Avg. 3.5 hr. cycle duration Cube: Weakest module sets performance limit Multistring: Operating flexibility with limitations PBU: Allows independent performance, capacity not optimized Single String: Strings perform independently Individual Modules: Optimized for capacity; easy fleet upgrades 2026+20252023 20242021 Evolution of Eos Controls from Cubes to Strings to PBUs to Modules 1 Balancing Domain / Cube 3 6 168 672 5
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Near-Zero Grid Impact During Dynamic Power Loads Z3 shields the grid from rapid fluctuations in power demand, benefiting both utilities and data centers 6 Bi-Directional Power Flow Eos helps make large volatile loads easier for the grid to accommodate without battery system degradation Time (Milliseconds) Power (kW) Eos System Millisecond Response Neutralized grid impact Battery supporting dynamic load and grid impact Energy flow to meet power needs 6 million power fluctuations per cycle 735 hrs. operating under fast power fluctuation load profile No additional temperature rise detected 147 consecutive cycles 81% RTE 20-100-20 SoC
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Pipeline 1 $765M ~3.2 GWh ~60% Standalone storage 19% YoY Change 4 hours 6 hours 8 hours > 8 hours Q3 Orders +6 Customers 4 New, 2 Repeat 17% 44% 3% 36% ~53% 8 hr.+ duration ~43% FPUSA Recent Strategic Win 10 MW / 100 MWh solar + storage in West Virginia 7 ~31% Data Center related Market Tailwinds Toward Long-Duration Storage LDES State Programs 7 priority states 5 have mandates 3 LDES Carve Out (1) Numbers shown as of 9/30/2026 (2) LCOS based on four-hour, 100 MW, 20-year life project and four cents per kWh of charging cost $24.9B / 112 GWh LCOS Value Proposition 2 Add ½ cycle / day = + ~20 pts. LCOS + 5 pts. RTE = + ~2 pts. LCOS Orders Backlog 1
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8 Operational KPIs Sequential Quarter Highlights Cube Output +23% • ~390 MWh shipped in Q3; TC line 1 +6% battery output Material Cost per Cube -9% • Exited higher-cost legacy purchase orders; lower-cost materials cut-in Direct Labor Cost per Cube -17% • Increased output with flat labor Manufacturing Ove rhead per Cube -8% • Higher throughput & fixed cost absorption Thorn Hill Q3 Metrics Battery Output / Shift +20% Vs. Turtle Creek Battery Output 17% Q3 Production Preparing Line 1 for Production in Thorn Hill Cease Line 1 Operations Late October SAT Line 1 in Thorn Hill End Q1 End of 2026 Capacity 2 GWh Driving Manufacturing Performance Line 2 achieving faster cycle times vs. line 1; ramp progressing as planned From Startup to Line 1 Yield Performance in 90 Days 3 13 26 Line 2 Bipolar & Battery Line 1 Bipolar Line 1 Battery > 8x faster months months months Time to Yield Parity 23% Volume and 10% Cost per Cube Improvement Start
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Third Quarter 2026 Financials ($ in millions) Q3 ’26 Q3 ‘25 % Change Q2 ’26 % Change Revenue 82.7 30.5 171% 68.8 20% Gross Profit (Loss) (44.2) (33.9) (30%) (48.8) 9% Margin % (53%) (111%) +58 pts. (71%) +18 pts. Operating Expenses1 35.1 27.3 29% 35.0 0% Net Income (Loss) Attributable to Shareholders 125.0 (641.4) 119% (275.7) 145% Adjusted Gross Profit (Loss) 2 (36.8) (30.4) (21%) (42.9) 14% Margin %3 (44%) (100%) +55 pts. (62%) +18 pts. Adjusted EBITDA (Loss) 2 (63.8) (52.7) (21%) (71.4) 11% Margin %4 (77%) (173%) +96 pts. (104%) +27 pts. Total Cash Balance5 344.1 126.8 171% 364.1 (5%) (1) Operating expenses include SG&A, R&D, Loss from write-down of property, plant and equipment, and restructuring expenses (2) See non-GAAP reconciliation in appendix (3) Adjusted Gross Profit Margin is Adjusted Gross Profit as a percentage of Revenue (4) Adjusted EBITDA Margin is Adjusted EBITDA as a percentage of Revenue (5) Includes restricted cash Note: Some calculations may not foot due to rounding9 (104%) (77%) Q2 ’26 (4 pts) Price 16 pts Volume 12 pts Product Cost Out 3 pts Project Margin Q3 ’26 Adjusted EBITDA Margin Progression 12 pts. Volume leverage Cash Walk5 $364 $344$87 Q2 ’26 Operating Capex DOE Other Q3 ’26 ($70) ($35) ($2) Additional Sources of Liquidity ($M) Remaining DOE Tranche 2 20 PA State and County Grants 24 Net Production Tax Credits as of Q3 39 Remaining DOE Loan for Lines 3 & 4 80 Cerberus Discretionary Revolver 105 15 pts. Operational improvements
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10 (69%) (62%) (44%) -80 -60 -40 -20 (25%) – (20%) Quarterly Adjusted Gross Margin $68.8 $82.7Total Revenue Product Adj. Gross Margin1 (40%) (29%) (15%) – (10%) Memo ($ millions) Q2 ‘26 Q3 ‘26 Q4 ‘26 Est. Steady Progress Toward Positive Adjusted Gross Margin (1) Product Adjusted Gross Profit is defined as gross profit attributable to our battery energy storage system products, adjusted to exclude non-cash stock-based compensation, depreciation and amortization. Note: Some calculations may not foot due to rounding $92 – $117$57.0 (52%) Q1 ‘26 (113%) (46%) – (43%) $114.2 FY ‘25 FY ‘26 Est. $300 – $325 (108%) (37%) – (35%) • Higher ASP from backlog • Material bundle buys • Higher labor utilization • Thorn Hill efficiencies • Turtle Creek overhead Q4 Drivers +6 +18 +19 to 24 Pt. Improvement +67 to 70 Annual Adjusted Gross Margin
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11 Appendix
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Appendix ($ In thousands) Q3 ‘24 Q4 ‘24 Q1 ‘25 Q2 ‘25 Q3 ‘25 Q4 ‘25 Q1 ‘26 Q2 ‘26 Q3 ‘26 Revenue $ 854 $ 7,253 $ 10,457 $ 15,236 $ 30,512 $ 57,998 $ 56,963 $ 68,775 $ 82,731 Cost of Goods Sold 25,764 30,753 34,996 46,189 64,437 112,418 101,390 117,576 126,934 Gross profit (loss) (24,910) (23,500) (24,539) (30,953) (33,925) (54,420) (44,427) (48,801) (44,203) add: Stock based compensation 1,058 1,202 1,020 503 504 549 507 516 508 add: Depreciation and amortization 2,386 2,317 2,394 2,632 3,012 4,739 4,880 5,416 6,925 Adjusted gross profit (loss) $ (21,466) $ (19,981) $ (21,125) $ (27,818) $ (30,409) $ (49,132) $ (39,040) $ (42,869) $ (36,770) Adjusted Gross Margin % (2514%) (275%) (202%) (183%) (100%) (85%) (69%) (62%) (44%) Non-GAAP Financial Measures & Reconciliations 12
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Appendix ($ In thousands) Q3 ‘24 Q4 ‘24 Q1 ‘25 Q2 ‘25 Q3 ‘25 Q4 ‘25 Q1 ‘26 Q2 ‘26 Q3 ‘26 Net income (loss) attributable to shareholders $ (342,866) $ (268,124) $ 15,136 $ (222,937) $ (641,393) $ (120,453) $ 508,883 $ (275,710) $ 125,043 add: Interest expense 5,424 5,248 5,945 6,639 4,006 6,665 9,455 8,318 10,059 (deduct) add: Income tax expense (16) 4 5 6 4 9 5 13 1,462 add: Depreciation and amortization 2,691 2,640 2,680 2,935 3,365 5,203 5,394 6,067 7,528 EBITDA (loss) (334,767) (260,232) 23,766 (213,357) (634,018) (108,576) 523,737 (261,312) 144,092 add: Stock based compensation 6,142 7,840 7,574 7,127 4,963 5,212 5,902 6,183 6,942 add (deduct): Change in fair value of derivatives 279,503 244,877 (80,511) 134,390 568,666 (35,877) (601,890) 143,578 (220,519) add (deduct): Change in fair value of debt 3,036 (37,099) 5,933 (31,615) 3,570 4,059 4,232 4,534 4,534 add: loss on debt extinguishment — — — 49,063 3,589 — — — — add: Restructuring — — — — — — — — 281 add: Other non-cash or non-recurring — — — 2,766 540 63,646 — 35,662 850 Adjusted EBITDA (loss) $ (46,086) $ (44,614) $ (43,238) $ (51,626) $ (52,690) $ (71,536) $ (68,019) $ (71,355) $ (63,820) Adjusted EBITDA Margin % (5396%) (615%) (413%) (339%) (173%) (123%) (119%) (104%) (77%) Quarter end stock price1 $2.97 $4.86 $3.78 $5.12 $11.39 $11.46 $4.96 $5.88 $3.07 % change from prior quarter 134% 64% (22%) 35% 122% 1% (57%) 19% (48%) Non-GAAP Financial Measures & Reconciliations 13 (1) Driver of fair value changes
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14 Revenue Margins 0.9 7.3 10.5 15.2 30.5 58.0 57.0 68.8 82.7 Q3 ’24 Q4 ’24 Q1 ’25 Q2 ’25 Q3 ’25 Q4 ’25 Q1 ’26 Q2 ’26 Q3 ’26 +171% -2,514% -5396% Q3 ’24 -275% -615% Q4 ’24 -202% -413% Q1 ’25 -183% -339% Q2 ’25 -100% -173% Q3 ’25 -85% -123% Q4 ’25 -69% -119% Q1 ’26 -62% -104% Q2 ’26 -44% -77% Q3 ’26 Adjusted Gross Margin Adjusted EBITDA Margin + 27 pts + 18 pts +55 pts +96 pts Appendix Volume Driving Margin Improvement & Narrowing the Gap Eight consecutive quarters of margin improvement Note: Some calculations may not foot due to rounding