Nature of Business and Basis of Presentation	3 Months Ended
Mar. 31, 2026
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 and project development company focused on delivering low-carbon gas power solutions. Founded in 2010, the Company’s mission is to transform natural gas into the lowest cost form of clean firm power. Net Power is developing a modular, standardized clean gas power plant product incorporating Entropy’s post-combustion carbon capture (“PCC”) technology (the “Clean Gas Product”). The development of the first project under this strategy is underway and is expected to be located at our Project Permian site in West Texas. Project Permian is being designed to accommodate up to 1 GW of clean firm power generation capacity and will be developed in multiple phases. Net Power's technology portfolio also includes the Oxy-Combustion Cycle, a patented oxy-combustion and supercritical CO2 power cycle that results in near-zero carbon dioxide emissions and eliminates criteria pollutants. Development of the Oxy-Combustion Cycle has been paused while the Company focuses resources on the Clean Gas Product; however, the Company retains its rights and assets related to this 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, 2025 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, 2025, filed with the SEC on March 9, 2026 (the “2025 Annual Report”).

NET Power Inc. (“Net Power” or the “Company”) is an energy technology and project development company focused on delivering low-carbon gas power solutions. Founded in 2010, the Company’s mission is to transform natural gas into the lowest cost form of clean firm power.

Net Power is developing a modular, standardized clean gas power plant product incorporating Entropy’s post-combustion carbon capture (“PCC”) technology (the “Clean Gas Product”). The development of the first project under this strategy is underway and is expected to be located at our Project Permian site in West Texas. Project Permian is being designed to accommodate up to 1 GW of clean firm power generation capacity and will be developed in multiple phases.

Net Power's technology portfolio also includes the Oxy-Combustion Cycle, a patented oxy-combustion and supercritical CO2 power cycle that results in near-zero carbon dioxide emissions and eliminates criteria pollutants. Development of the Oxy-Combustion Cycle has been paused while the Company focuses resources on the Clean Gas Product; however, the Company retains its rights and assets related to this technology,

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, 2025 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, 2025, filed with the SEC on March 9, 2026 (the “2025 Annual Report”).