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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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Numerator        
Net loss after income tax $ (82,047) $ (17,217) $ (455,633) $ (58,849)
Net loss attributable to NET Power Inc. $ (28,142) $ (4,268) $ (147,492) $ (15,689)
Denominator        
Weighted-average number shares outstanding, basic (in shares) 77,699 72,177 77,350 72,036
Weighted-average number shares outstanding, diluted (in shares) 77,699 72,177 77,350 72,036
Loss per share attributable to shareholders, basic (in dollars per share) $ (0.36) $ (0.06) $ (1.91) $ (0.22)
Loss per share attributable to shareholders, diluted (in dollars per share) $ (0.36) $ (0.06) $ (1.91) $ (0.22)