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Earning (loss) per Share - Schedule of Earnings (Loss) Per Share, Basic, and Diluted, For Common Stock (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Numerator        
Net loss after income tax $ (1,159,806) $ (6,814) $ (1,615,439) $ (65,662)
Net income (loss) attributable to NET Power Inc. $ (411,498) $ 818 $ (558,990) $ (14,871)
Denominator        
Weighted-average number shares outstanding, basic (in shares) 77,883 73,537 77,530 72,541
Weighted-average number shares outstanding, diluted (in shares) 77,883 73,537 77,530 72,541
Earnings (loss) per share attributable to shareholders, basic (in dollars per share) $ (5.28) $ 0.01 $ (7.21) $ (0.21)
Earnings (loss) per share attributable to shareholders, diluted (in dollars per share) $ (5.28) $ 0.01 $ (7.21) $ (0.21)