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Nature of Business and Basis of Presentation	9 Months Ended
Nature of Business and Basis of Presentation	Sep. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Business and Basis of Presentation	NOTE 1 — Nature of Business and Basis of Presentation Nature of Business NET Power Inc. (“Net Power” or the “Company”) is an energy technology company focused on delivering low-carbon gas power solutions. Historically, the Company’s sole business has been the development of a novel oxy-combustion power generation system (which we refer to as the “Net Power Cycle”) designed to produce reliable and affordable electricity from natural gas while capturing virtually all atmospheric emissions. The Net Power Cycle is designed to inherently capture CO2 while producing virtually no air pollutants such as SOX, NOX, and other particulates. Recently, the Company broadened the scope of its business to potentially include the development of low-carbon gas power solutions using more standard natural gas turbines paired with post-combustion carbon capture technology. Basis of Presentation The accompanying unaudited condensed consolidated financial statements included in this Quarterly Report on Form 10-Q have been prepared in conformity with accounting principles generally accepted in the United States of America (“US GAAP”) for interim financial information; however, certain information or footnote disclosures normally included in complete financial statements prepared in accordance with US GAAP may have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). In management’s opinion, these unaudited condensed consolidated financial statements have been prepared on the same basis as the annual financial statements for the year ended December 31, 2024 and include all adjustments, which consist of only normal and recurring adjustments, necessary for fair statement. Certain prior period financial information has been reclassified to conform to current period presentation. The results reported in these unaudited condensed consolidated financial statements are not necessarily indicative of the results to be expected for the entire year. These unaudited condensed consolidated financial statements should be read in conjunction with the annual financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2024, filed with the SEC on March 10, 2025 (the “2024 Annual Report”).