ArcLight Clean Transition Corp. II (ACTDW) operates as a special purpose acquisition company, or blank check company, focused on pursuing merger, share exchange, asset acquisition, share purchase, reorganization, or similar business combination opportunities with businesses in the energy and natural resources sectors, particularly those aligned with the accelerating transition toward sustainable use of energy and natural resources; it does not currently manufacture, sell, or provide specific products or services beyond its SPAC structure. Founded in 2021 and headquartered at 200 Clarendon Street, 55th Floor, Boston, Massachusetts 02116, the company targets industries including clean energy transition and natural resources across the United States. In a major strategic development completed on July 21, 2022, ArcLight Clean Transition Corp. II was acquired by OPAL Fuels LLC through a reverse merger transaction valued at approximately $1.7 billion, resulting in the combined entity being renamed OPAL Fuels Inc. with its Class A ordinary shares trading on Nasdaq under the ticker OPAL and warrants under OPALW; this deal, initially announced in December 2021, included a $125 million private investment in public equity anchored by NextEra Energy and followed shareholder approval on July 15, 2022. Post-merger, outstanding warrants associated with ACTDW transitioned to OPAL Fuels Inc. structure, with OPAL Fuels conducting a warrant exchange offer in late 2022 whereby holders could exchange warrants for 0.225 or 0.250 shares of Class A common stock, simplifying the capital structure; as of 2025, ACTDW warrants continue to trade as remnants of the original SPAC, reflecting no further independent operations by ArcLight Clean Transition Corp. II, which remains inactive as a standalone entity.