☒ANNUAL REPORT PURSUANT TO SECTION13 OR 15(d)OF THE SECURITIES EXCHANGE ACT OF 1934For the fiscalyear ended:December31, 2024OR☐TRANSITION REPORT PURSUANT TO SECTION13 OR 15(d)OF THE SECURITIES EXCHANGE ACT OF 1934 Securities registered pursuant to Section12(b)of the Act: Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule405 of the Securities Act. Yes☐No☑ Indicate by check mark if the registrant is not required to file reports pursuant to Section13 or 15 (d)of the Act. Yes☐No☑ Indicate by check mark whether the registrant (1)has filed all reports required to be filed by Section13 or 15(d)of the Securitiesand Exchange Act of 1934 during the preceding 12months (or for such shorter period that the registrant was required to file suchreports), and (2)has been subject to such filing requirements for the past 90days.Yes☑No☐ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submittedpursuant to Rule405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12months (or for such shorter period thatthe 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, or a smallerreporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smallerreporting company,” and “emerging growth company” in Rule12b-2 of the Exchange Act. ☑Accelerated filer☑Smaller reporting company☐Emerging growth company ☐Large accelerated filer☐Non-accelerated filer If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period forcomplying with any new or revised financial accounting standards provided pursuant to Section13(a)of the Exchange Act.☐ Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of theeffectiveness of its internal control over financial reporting under Section404(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.☑ If securities are registered pursuant to Section12(b)of the Act, indicate by check mark whether the financial statements of theregistrant included in the filing reflect the correction of an error to previously issued financial statements.☐ Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to§240.10D-1(b).☐ Indicate by check mark whether the registrant is a shell company (as defined in Rule12b-2 of the Exchange Act). Yes☐No☑ The aggregate market value of the common stock held by non-affiliates (public float) on June28, 2024, was $236,738,085, basedon the closing price reported that date by the NASDAQ of $7.77 per share. As of March10, 2025, we had42,619,347shares outstanding. Our Annual Meeting of Shareholders will be held on May29, 2025,in Denver, Colorado. FORWARD-LOOKING STATEMENTS Certain statements and information in this Annual Report on Form10-K may constitute “forward-looking statements.”These statements are based on our beliefs as well as assumptions made by, andinformation currently available to us. When used in this document, the words “anticipate,” “believe,”“continue,” “estimate,” “expect,” “forecast,” “may,” “project,” “will,” and similar expressionsidentify forward-looking statements. Without limiting the foregoing, all statements relating to ourfuture outlook, anticipated capital expenditures, future cash flows and borrowings and sources offunding are forward-looking statements. These statements reflect our current views with respect tofuture events and are subject to numerous assumptions that we believe are open to a wide range ofuncertainties and business risks, and actual results may differ materially from those discussed in thesestatements. Among the factors that could cause actual results to differ from those in the forward-looking statements are: ●changes in macroeconomic and market conditions and market volatility, and the impact ofsuchchanges and volatility on our financial position;●fluctuations in weather, gas and electricity commodity costs, inflation and economicconditions impact demand of our customers and our operating results;●the outcome or escalation of current hostilities in Ukraine and Israel;●changes in competition in electricity or coal markets and our ability to respond to suchchanges;●changes in coal prices, demand, and availability which could affect our operating results andcash flows;●risks associated with the expansion of our operations and properties;●legislation, regulations, administrative actions (e.g., Executive Orders), and court decisionsand interpretations thereof