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Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Income Statement [Abstract]        
Revenue $ 0 $ 238 $ 0 $ 238
Cost of revenue 0 30 0 30
Gross profit 0 208 0 208
Operating expenses        
General and administrative 13,578 7,787 22,270 14,097
Sales and marketing 1,492 876 2,679 1,628
Research and development 26,618 15,483 49,218 26,751
Project development 27,198 869 31,687 1,291
Goodwill impairment and other charges 0 0 415,897 0
Depreciation, amortization, and accretion 21,669 20,047 43,356 40,079
Total operating expenses 90,555 45,062 565,107 83,846
Operating loss (90,555) (44,854) (565,107) (83,638)
Other income        
Interest income 5,466 9,029 11,345 16,719
Change in Earnout Shares liability and Warrant liability 1,415 16,249 75,580 1,671
Change in Tax Receivable Agreement liability 0 0 21,317 0
Other income 5 6 6 8
Net other income 6,886 25,284 108,248 18,398
Net loss before income tax (83,669) (19,570) (456,859) (65,240)
Income tax benefit 1,622 2,353 1,226 6,391
Net loss after income tax (82,047) (17,217) (455,633) (58,849)
Net loss attributable to non-controlling interests (53,905) (12,949) (308,141) (43,160)
Net loss attributable to NET Power Inc. (28,142) (4,268) (147,492) (15,689)
Other comprehensive income        
Unrealized gain (loss) on investments 66 (860) 82 (198)
Total other comprehensive income (loss) 66 (860) 82 (198)
Comprehensive loss (81,981) (18,077) (455,551) (59,047)
Comprehensive loss attributable to non-controlling interests (53,862) (13,518) (308,141) (43,291)
Comprehensive loss attributable to NET Power Inc. $ (28,119) $ (4,559) $ (147,410) $ (15,756)
Loss per share of Class A Common Stock, basic (in dollars per share) $ (0.36) $ (0.06) $ (1.91) $ (0.22)
Loss per share of Class A Common Stock, diluted (in dollars per share) $ (0.36) $ (0.06) $ (1.91) $ (0.22)
Weighted average shares of Class A Common Stock, basic (in shares) 77,699 72,177 77,350 72,036
Weighted average shares of Class A Common Stock, diluted (in shares) 77,699 72,177 77,350 72,036