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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 Form 10 - K ( Mark One ) ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED December 31 , 2020 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM ΤΟ WA ( State or other jurisdiction of incorporation or organization ) Title of Each Class Common Stock Commission file number 001-03701 AVISTA CORPORATION ( Exact name of Registrant as specified in its charter ) Large Accelerated Filer Non - accelerated Filer 1411 East Mission Avenue , Spokane , WA 99202-2600 ( Address of principal executive offices , including zip code ) Registrant's telephone number , including area code : 509-489-0500 Web site : http://www.avistacorp.com Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) AVA X☐☐ 91-0462470 ( I.R.S. Employer Identification No. ) Indicate by check mark if the registrant is a well - known seasoned issuer , as defined Rule 405 of the Securities Act . Yes No Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15 ( d ) of the Act . Yes □ No × Indicate by check mark whether the registrant ( 1 ) has filed all ports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the Registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days : Yes No Name of Each Exchange on Which Registered NYSE Securities registered pursuant to Section 12 ( g ) of the Act : Title of Class Preferred Stock , Cumulative , Without Par Value Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( §232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes No Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company , or an emerging growth company . See the definitions of “ large accelerated filer , ” “ accelerated filer , ” “ smaller reporting company , " and " emerging growth company " in Rule 12b - 2 of the Exchange Act . ( Check one ) : Accelerated Filer Smaller reporting company Emerging growth company If an emerging growth company , indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13 ( a ) of the Exchange Act . Document Proxy Statement to be filed in connection with the annual meeting of shareholders to be held on May 11 , 2021 . Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( 15 U.S.C. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . Indicate by check mark whether the Registrant is a shell company ( as defined in Rule 12b - 2 of the Exchange Act ) : Yes No The aggregate market value of the Registrant's outstanding Common Stock , no par value ( the only class of voting stock ) , held by non - affiliates is $ 2,471,363,713 based on the last reported sale price thereof on the consolidated tape on June 30 , 2020 . As of January 31 , 2021 , 69,263,835 shares of Registrant's Common Stock , no par value ( the only class of common stock ) , were outstanding . Documents Incorporated By Reference Part of Form 10 - K into Which Document is Incorporated Part III , Items 10 , 11 , 12 , 13 and 14