Capstone Energy Plus, Inc.

Capstone Green Energy Holdings, Inc. (the “Company”) is unable to file its Quarterly Report on Form 10-Q for the quarter ended June 30, 2024 (the “Quarterly Report”) without unreasonable effort and expense. The Company needs additional time because the Company is still in the process of compiling information necessary to complete the Company’s Annual Report on Form 10-K for the fiscal year ended March 31, 2024 (the “Annual Report”) and the Company’s Quarterly Report on Form 10-Q for the fiscal quarter ended December 31, 2023, and Marcum LLP (“Marcum”), the Company’s independent registered public accounting firm, requires additional time to review the condensed consolidated financial statements as of and for the quarter ended December 31, 2023 to be included in the Quarterly Report, to complete its audit of the consolidated financial statements as of and for the year ended March 31, 2024 to be incorporated in the Annual Report, and to review the condensed consolidated financial statements as of and for the quarter ended June 30, 2024 to be included in the Quarterly Report, once the Company has completed its preparation

Capstone Green Energy Holdings, Inc. (the “Company”) is unable to file its Annual Report on Form 10-K for the fiscal year ended March 31, 2024 (the “Annual Report”) without unreasonable effort and expense. The Company needs additional time because the Company is still in the process of compiling information necessary to complete the Annual Report, and Marcum LLP (“Marcum”), the Company’s independent registered public accounting firm, requires additional time to complete its audit of the consolidated financial statements as of and for the year ended March 31, 2024 to be incorporated in the Annual Report once the Company has completed its preparation. The delays are attributable in large part to the fact that management has had to devote significant time and attention to (i) the restatement of the Company’s consolidated financial statements as of, and for the fiscal years ended March 31, 2022 and March 31, 2021, as well as the relevant unaudited quarterly financial information for the quarterly periods ended June 30, 2021, September 30, 2021, December 31, 2021, June 30, 2020, September 30, 2020, and December 31, 2020 (the “Restatement”), and (ii) the Company’s efforts to file its Annual Report on Form 10-K/A for the fiscal year ended March 31, 2022 and Annual Report on Form 10-K for the fiscal year ended March 31, 2023, , each filed with the Securities and Exchange Commission (the “SEC”) on June 13, 2024, as well as the Quarterly Reports on Form 10-Q for the periods ended June 30, 2023, September 30, 2023 and December 31, 2023 (the “Quarterly Reports”). Although it is the Company’s goal to file the Annual Report no later than the fifteenth calendar day following the prescribed filing date (the “Extension Period”), there can be no assurance that the Company will be able to do so. Cautionary Note Regarding Forward-Looking Statements This Form 12b-25 contains forward-looking statements within the meaning of applicable United States securities laws

Capstone Green Energy Corporation (the “Company”) is unable to file its Quarterly Report on Form 10-Q for the quarter ended September 30, 2023 (the “Second Quarter Quarterly Report”) without unreasonable effort and expense. The Company needs additional time because the Company is still in the process of compiling information necessary to complete the Quarterly Report, the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2023 (the “First Quarter Quarterly Report” and, together with the Second Quarter Quarterly Report, the “Quarterly Reports”) and the Company’s Annual Report on Form 10-K for the fiscal year ended March 31, 2023 (the “Annual Report”), and Marcum LLP (“Marcum”), the Company’s independent registered public accounting firm, requires additional time to complete its audit of the consolidated financial statements as of and for the year ended March 31, 2023 to be incorporated in the Annual Report, and will need additional time to review the consolidated financial statements as of and for the year ended March 31, 2023 to be included in the Quarterly Reports, once the Company has completed their preparation. The delays are attributable to (i) management’s continued work on the restatement of the Company’s previously issued consolidated financial statements, as reported on the Company’s Current Report on Form 8-K filed on September 22, 2023 and (ii) the fact that management has had to devote significant time and attention to the Company’s Chapter 11 bankruptcy proceedings and matters related to the Company’s emergence from bankruptcy. Cautionary Note Regarding Forward-Looking Statements This Form 12b-25 contains forward-looking statements within the meaning of applicable United States securities laws. These forward-looking statements include statements regarding the completion of activities necessary to permit such filings, including the completion of the restatement

Capstone Green Energy Corporation (the “Company”) is unable to file its Quarterly Report on Form 10-Q for the quarter ended June 30, 2023 (the “Quarterly Report”), without unreasonable effort and expense. The Company needs additional time because the Company still in the process of compiling information necessary to complete both the Quarterly Report and the Company’s Annual Report on Form 10-K for the fiscal year ended March 31, 2023 (the “Annual Report”), and Marcum LLP (“Marcum”), the Company’s independent registered public accounting firm, requires additional time to complete its audit of the consolidated financial statements as of and for the year ended March 31, 2023 to be incorporated in the Annual Report, and will need additional time to review the consolidated financial statements as of and for the year ended March 31, 2023 to be included in the Quarterly Report, once the Company has completed their preparation. The delays are attributable in large part to the ongoing review and investigations by the Audit Committee of financial reporting and other matters. Cautionary Note Regarding Forward-Looking Statements This Form 12b-25 contains forward-looking statements within the meaning of applicable United States securities laws. These forward looking statements include statements regarding the completion of activities necessary to permit such filing within the applicable extension period, including the Audit Committee’s review of certain matters. Forward-looking statements are based on management’s current expectations or beliefs about the Company’s future plans, expectations and objectives. These forward-looking statements are not historical facts and are subject to risks and uncertainties that could cause the actual results to differ materially from those projected in these forward-looking statements

Capstone Green Energy Corporation (the “Company”) is unable to file its Annual Report on Form 10-K for the fiscal year ended March 31, 2023 (the “Annual Report”), without unreasonable effort and expense. The Company needs additional time as a result of the following: ● The Company is still in the process of compiling required information to complete the Annual Report and Marcum LLP (“Marcum”), its independent registered public accounting firm, requires additional time to complete its audit of the consolidated financial statements as of and for the year ended March 31, 2023 to be incorporated in the Annual Report, which includes, but is not limited to, completing its procedures pertaining to certain matters being reviewed by the Company’s Audit Committee and matters relating to the NPA (as defined below). ● As the end of the year ended March 31, 2023 the Company was, and the Company currently is, in violation of certain of its covenants, including the minimum liquidity covenant, contained in its Amended and Restated Note Purchase Agreement, as amended (the “NPA”), with Goldman Sachs Specialty Lending Group, L.P. (“Goldman”). To address those defaults and other matters (including the maturity of the notes on October 1, 2023), the Company has been working with Goldman to enter into a waiver and amendment to the NPA, which has consumed a significant amount of the Company’s finance and accounting personnel’s time. There can be no assurance that the Company will be able to enter into a waiver and amendment, and such waiver and amendment will likely impose additional burdens on the Company. Although it is the Company’s goal to file the Annual Report no later than the fifteenth calendar day following the prescribed filing date (the “Extension Period”), there can be no assurance that the Company will be able to do so

Capstone Green Energy Corporation (the “Company”) is unable to file its Annual Report on Form 10-K for the fiscal year ended March 31, 2023 (the “Annual Report”), without unreasonable effort and expense. The Company needs additional time as a result of the following: ● The Company is still in the process of compiling required information to complete the Annual Report and Marcum LLP (“Marcum”), its independent registered public accounting firm, requires additional time to complete its audit of the consolidated financial statements as of and for the year ended March 31, 2023 to be incorporated in the Annual Report, which includes, but is not limited to, completing its procedures pertaining to certain matters being reviewed by the Company’s Audit Committee and matters relating to the NPA (as defined below). ● As the end of the year ended March 31, 2023 the Company was, and the Company currently is, in violation of certain of its covenants, including the minimum liquidity covenant, contained in its Amended and Restated Note Purchase Agreement, as amended (the “NPA”), with Goldman Sachs Specialty Lending Group, L.P. (“Goldman”). To address those defaults and other matters (including the maturity of the notes on October 1, 2023), the Company has been working with Goldman to enter into a waiver and amendment to the NPA, which has consumed a significant amount of the Company’s finance and accounting personnel’s time. There can be no assurance that the Company will be able to enter into a waiver and amendment, and such waiver and amendment will likely impose additional burdens on the Company. Although it is the Company’s goal to file the Annual Report no later than the fifteenth calendar day following the prescribed filing date (the “Extension Period”), there can be no assurance that the Company will be able to do so

Capstone Green Energy Corporation (the “Company”) is unable to file its Annual Report on Form 10-K for the fiscal year ended March 31, 2022 (the “Annual Report”), without unreasonable effort and expense. The Company needs additional time as a result of the following: ​ ● The Company is still in the process of compiling required information to complete the Annual Report and Marcum LLP (“Marcum”), its independent registered public accounting firm, requires additional time to complete its audit of the consolidated financial statements as of and for the year ended March 31, 2022 to be incorporated in the Annual Report, which includes, but is not limited to, completing its procedures pertaining to the Company’s analysis regarding the collectability of certain customer accounts receivable and auditing the Company’s analysis of its ability to continue as a going concern as it relates to the Goldman Sachs waiver and amendment as described below. ​ ● The Company expects that its financial results for the year ended March 31, 2022 will result in the Company being in violation of certain of its financial covenants contained in its Amended and Restated Note Purchase Agreement, as amended (the “NPA”), with Goldman Sachs Specialty Lending Group, L.P. (“Goldman”). To address those defaults, the Company has been working with Goldman to enter into a waiver and amendment to the NPA, which has consumed a significant amount of the Company’s finance and accounting personnel’s time. There can be no assurance that the Company will be able to enter into a waiver and amendment, and such waiver and amendment will likely impose additional burdens on the Company. ​ The Company anticipates that it will file the Annual Report no later than the fifteenth calendar day following the prescribed filing date (the “Extension Period”)