Fortistar Sustainable Solutions Corp. (FSSIU) operates as a blank check company whose primary business is to pursue mergers, capital stock exchanges, asset acquisitions, stock purchases, reorganizations or other similar business combinations with one or more businesses focused on sustainability solutions, particularly those reducing carbon intensity in energy, industrial and transportation value chains; the company has no significant independent operations or products. Incorporated in 2020 and headquartered at One North Lexington Avenue in White Plains, New York, it targets opportunities contributing to greenhouse gas emission reductions and greater energy efficiency. In December 2022, shareholders voted to redeem all public shares and liquidate the company without completing a business combination, marking its primary recent operational change; it maintains affiliations with Fortistar, the privately-owned investment firm founded in 1993 that backs its SPAC activities and invests in portfolio companies offering renewable natural gas via OPAL Fuels, waste plastic solutions from Braven Environmental, carbon capture technologies from Carbonfree Chemicals, anti-reflective coatings via Pellucere Technologies and energy storage through Epic Star Energy. Geographically, the focus spans North America with projects including Hawaii renewables acquired by Fortistar and Epic Star in 2025 and U.S. landfill gas initiatives, serving heavy-duty fleets, industrial clients and utilities seeking decarbonization.