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Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Income Statement [Abstract]        
Revenue $ 0 $ 12 $ 0 $ 250
Cost of revenue 0 1 0 31
Gross profit 0 11 0 219
Operating expenses        
General and administrative 9,108 8,448 31,378 22,643
Sales and marketing 1,395 1,032 4,074 2,660
Research and development 24,543 17,333 73,761 44,083
Project development 10,032 233 41,719 1,426
Impairment and other charges 1,095,839 0 1,511,735 0
Depreciation, amortization, and accretion 15,580 20,210 58,936 60,289
Total operating expenses 1,156,497 47,256 1,721,603 131,101
Operating loss (1,156,497) (47,245) (1,721,603) (130,882)
Other income (expense)        
Interest income 4,835 7,992 16,179 24,712
Change in Earnout Shares liability and Warrant liability (9,323) 27,690 66,257 29,361
Change in Tax Receivable Agreement liability 0 0 21,317 0
Other income 2 3 8 10
Net other income (expense) (4,486) 35,685 103,761 54,083
Net loss before income tax (1,160,983) (11,560) (1,617,842) (76,799)
Income tax benefit 1,177 4,746 2,403 11,137
Net loss after income tax (1,159,806) (6,814) (1,615,439) (65,662)
Net loss attributable to non-controlling interests (748,308) (7,632) (1,056,449) (50,791)
Net income (loss) attributable to NET Power Inc. (411,498) 818 (558,990) (14,871)
Other comprehensive income        
Unrealized gain on investments 163 528 245 461
Total other comprehensive income 163 528 245 461
Comprehensive loss (1,159,643) (6,286) (1,615,194) (65,201)
Comprehensive loss attributable to non-controlling interests (748,203) (7,284) (1,056,291) (50,487)
Comprehensive income (loss) attributable to NET Power Inc. $ (411,440) $ 998 $ (558,903) $ (14,714)
Earnings (loss) per share of Class A Common Stock, basic (in dollars per share) $ (5.28) $ 0.01 $ (7.21) $ (0.21)
Earnings (loss) per share of Class A Common Stock, diluted (in dollars per share) $ (5.28) $ 0.01 $ (7.21) $ (0.21)
Weighted average shares of Class A Common Stock, basic (in shares) 77,883 73,537 77,530 72,541
Weighted average shares of Class A Common Stock, diluted (in shares) 77,883 73,537 77,530 72,541