SCHEDULE 13D/A 0001123292-25-000700 0000753308 XXXXXXXX LIVE 3 Class A Common Stock, par value $0.0001 per share 03/10/2026 false 0001842279 68347P103 OPAL Fuels Inc.

700 Universe Boulevard Juno Beach FL 33408

Charles E. Sieving, Esq., EVP 561-694-4000 NextEra Energy, Inc. 700 Universe Boulevard Juno Beach FL 33408 0000753308 NEXTERA ENERGY INC WC FL 0 2158547 0 2158547 2158547 N 7.4 HC Items 8, 10, 11: Reflects 2,158,547 shares of Class A common stock, par value $0.0001 per share ("Class A Common Stock"), owned by Mendocino Capital, LLC, a wholly owned subsidiary of NextEra Energy, Inc., a publicly traded company with its common stock listed on the New York Stock Exchange under the symbol "NEE". Item 13: The percentage used herein and in the rest of this Schedule 13D is calculated based upon 28,996,177 shares of the Issuer's Class A Common Stock outstanding as of November 7, 2025, as disclosed in the Issuer's Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on November 7, 2025. 0001940599 Mendocino Capital, LLC WC DE 0 2158547 0 2158547 2158547 N 7.4 OO Items 8, 10, 11: Reflects 2,158,547 shares of Class A Common Stock owned by Mendocino Capital, LLC, a wholly owned subsidiary of NextEra Energy, Inc., a publicly traded company with its common stock listed on the New York Stock Exchange under the symbol "NEE". Item 13: The percentage used herein and in the rest of this Schedule 13D is calculated based upon 28,996,177shares of the Issuer's Class A Common Stock outstanding as of November 7, 2025, as disclosed in the Issuer's Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on November 7, 2025. Class A Common Stock, par value $0.0001 per share OPAL Fuels Inc. 700 Universe Boulevard Juno Beach FL 33408 This Amendment No. 3 ("Amendment No. 3") to Schedule 13D relates to the Class A common stock, $0.0001 par value per share (the "Class A Common Stock"), of OPAL Fuels Inc. (the "Issuer"), and amends and supplements the initial statement on Schedule 13D originally filed with the Securities and Exchange Commission (the "SEC") by the Reporting Persons on August 1, 2022, as amended by Amendments No. 1 and No. 2 thereto on January 5, 2024 and December 3, 2025, respectively (as amended by such Amendments No. 1 and No. 2, the "Original Schedule 13D"). Capitalized terms used but not defined in this Amendment No. 3 shall have the same meanings ascribed to them in the Original Schedule 13D. This Amendment No. 3 is being filed solely to amend and restate Item 6 below to report the new information described therein. The second paragraph of Item 6 of the Original Schedule 13D is hereby amended and restated as follows: In addition to the 2,158,547 shares of Class A Common Stock that are described herein, the Reporting Persons were previously the beneficial owners of Series A Preferred Units of Opal Fuels LLC (the "Series A Preferred Units"), all of which were directly owned by Mendocino. Opal Fuels LLC is an entity that directly or indirectly holds substantially all of the consolidated assets and business of the Issuer. On December 3, 2025, Mendocino provided written notice to Opal Fuels LLC, pursuant and subject to Opal Fuels LLC's Series A Preferred Unit Certificate of Designations, that Mendocino requested redemption, no later than 90 days after the date of such notice, of all of the Series A Preferred Units. On March 6, 2026, Opal Fuels fully redeemed from Mendocino all of the Series A Preferred Units. NEXTERA ENERGY INC /s/ Mark Hickson 03/10/2026 Mendocino Capital, LLC /s/ Mark Hickson 03/10/2026