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Adjustments Prior Service Cost [Member] Company Selected Measure Name Company Selected Measure Name Purchases of available-for-sale securities Payments to Acquire Debt Securities, Available-for-Sale Income Tax Disclosure [Abstract] Class of warrant or right, redemption price per warrant (in dollars per share) Class Of Warrant Or Right, Redemption Price Per Warrant Class Of Warrant Or Right, Redemption Price Per Warrant Unrealized gain (loss) on investments OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax Supplemental non-cash investing and financing activities: Noncash Investing and Financing Items [Abstract] NET Power Inc. Subsidiary, Ownership Percentage, Parent Share Price Is Below Eighteen U.S. Dollars Share Price Is Below Eighteen U.S. Dollars [Member] Share Price Is Below Eighteen U.S. Dollars Depreciation, amortization, and accretion Depreciation, Depletion and Amortization, Nonproduction Related Party Transactions [Abstract] Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Weighted average shares of Class A Common Stock, diluted (in shares) Weighted-average number of shares outstanding, diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Warrants, each exercisable for one share of Class A Common Stock at a price of $11.50 Warrant [Member] Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Total property, plant, and equipment, net Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Commercial paper Commercial Paper [Member] U.S. treasuries US Treasury Securities [Member] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Franchise tax Franchise Tax Payable Franchise Tax Payable Other long-term assets Increase (Decrease) in Other Noncurrent Assets Accumulated depreciation and amortization Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Amortization Impairment loss Total Long-Lived Asset, Held and Used, Impairment Loss Award Timing Predetermined Award Timing Predetermined [Flag] Intangible Asset, Goodwill and Other [Abstract] Debt Securities, Available-for-Sale [Line Items] Debt Securities, 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lease right-of-use assets Operating Lease, Right-of-Use Asset Effective income tax expense (benefit) rate reconciliation, estimated annual percent Effective Income Tax Rate Reconciliation, Estimated Annual Percent Effective Income Tax Rate Reconciliation, Estimated Annual Percent Schedule of Loss per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Fair Value Disclosures [Abstract] Investments Investment in Debt and Equity Securities and Other Trading Assets [Text Block] Expiration Date Trading Arrangement Expiration Date Net decrease in cash, cash equivalents, and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Excluding Exchange Rate Effect, Including Discontinued Operation Professional fees Accrued Professional Fees Class of Warrant or Right [Axis] Class of Warrant or Right [Axis] Denominator Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Schedule 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Recovery due to Disqualification of Tax Benefits, Amount Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Insider Trading Policies and Procedures [Line Items] Make-Whole Awards Make-Whole Awards [Member] Make-Whole Awards Share Price Equals Or Exceeds Ten U.S. Dollars Share Price Equals Or Exceeds Ten U.S. Dollars [Member] Share Price Equals Or Exceeds Ten U.S. Dollars Accrued Liabilities Accounts Payable and Accrued Liabilities Disclosure [Text Block] Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Unvested PSUs Performance Shares [Member] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Type of 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Discontinued Operation Comprehensive loss attributable to non-controlling interests Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest Income Statement [Abstract] Document Transition Report Document Transition Report Ownership [Axis] Ownership [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Operating expenses Operating Expenses [Abstract] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Schedule of Intangible Assets Intangible Asset, Finite-Lived [Table Text Block] Quantity Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] City Area Code City Area Code Total property, plant, and equipment, gross Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Document Information [Table] Document 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(Used in) Investing Activity, Continuing Operation [Abstract] Unrecorded unconditional purchase obligation, weighted average share price (in dollars per share) Unrecorded Unconditional Purchase Obligation, Weighted Average Share Price Unrecorded Unconditional Purchase Obligation, Weighted Average Share Price Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Continuing Operation [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Balance of recurring Level 3 liabilities at beginning of period Balance of recurring Level 3 liabilities at end of period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Operating loss Operating Income (Loss) Current Fiscal Year End Date Current Fiscal Year End Date Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Unrealized loss, current Debt Securities, Available-for-Sale, Unrealized Loss, Current Debt Securities, Available-for-Sale, Unrealized Loss, Current Related Party Transaction [Domain] Related Party Transaction [Domain] Unrecorded unconditional purchase obligation Unrecorded Unconditional Purchase Obligation Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] NET Power Inc. NET Power, Inc. [Member] NET Power, Inc. Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Weighted-Average Grant Date Fair Value Per Share Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Liabilities Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases, (Sales), Issuances, (Settlements) [Abstract] Impairment and other charges Asset, Impairment Loss Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Common stock, shares, issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Asset retirement obligation Asset Retirement Obligations, Noncurrent Investments in securities, available-for-sale Investments in securities, available-for-sale, current Debt Securities, Available-for-Sale, Current Equity Components [Axis] Equity Components [Axis] Expense Recognized Share-Based Payment Arrangement, Recognized Amount [Abstract] Related Party Related Party [Member] Class of Stock [Line Items] Class of Stock [Line Items] Cash paid for income taxes Income Tax Paid, after Refund Received Class A Common Stock Vested Class A OpCo Units Common Class A [Member] Entity Interactive Data Current Entity Interactive Data Current Net loss attributable to non-controlling interests Net Income (Loss) Attributable to Noncontrolling Interest Finance lease liabilities, current Finance Lease, Liability, Current Measurement Input, Offered Price Measurement Input, Offered Price [Member] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Impaired Long-Lived Assets Held and Used, Asset Name [Domain] Impaired Long-Lived Assets Held and Used, Asset Name [Domain] Adjustment of redeemable non-controlling interest to redemption value Noncontrolling Interest, Change in Redemption Value Entity Small Business Entity Small Business Comprehensive loss attributable to NET Power Inc. 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Adjustments Equity Awards Adjustments [Member] Total liabilities, mezzanine shareholders' equity, and shareholders' equity Liabilities and Equity Share-based payment arrangement, accelerated cost Share-Based Payment Arrangement, Accelerated Cost Stock Options Share-Based Payment Arrangement, Option [Member] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Asset retirement obligation, current Asset Retirement Obligation, Current Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Restructuring charges Restructuring Charges Related Party, Type [Domain] Related and Nonrelated Parties [Domain] Plan Name [Axis] Plan Name [Axis] Interest receivable Interest Receivable, Current Tabular List, Table Tabular List [Table Text Block] Additional 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Period Long-term assets Assets, Noncurrent [Abstract] General and administrative General and Administrative Expense Long-Lived Asset, Class [Domain] Long-Lived Asset, Class [Domain] Property, plant, and equipment, net Property, Plant and Equipment [Member] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Property, Plant, and Equipment [Table] Property, Plant, and Equipment [Table] Preferred Stock, $.0001 par value; 1,000 shares authorized; no shares issued or outstanding as of June 30, 2026 and December 31, 2025 Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] Class of Stock [Domain] Class of Stock [Domain] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous 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Total accrued liabilities Accrued Liabilities Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and Cash Equivalent Term (in years) Measurement Input, Expected Term [Member] Change in Tax Receivable Agreement liability Change in Tax Receivable Agreement liability Loss on change in tax receivable agreement liability Gain (Loss) On Change In Tax Receivable Agreement Liability Gain (Loss) On Change In Tax Receivable Agreement Liability Capitalized software Payments for Software Company Selected Measure Amount Company Selected Measure Amount Investments, Debt and Equity Securities [Abstract] Depreciation, amortization, and accretion Depreciation, Depletion and Amortization Entity Address, Address Line Two Entity Address, Address Line Two Share-based compensation (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Net loss after income tax Net loss Net loss before income tax Net loss after income tax Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Current assets Assets, Current [Abstract] Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Operating lease right-of use asset acquired Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Maturities of short-term investments Proceeds from Sale, Maturity and Collection of Short-Term Investments Income tax (expense) benefit Income tax expense (benefit) Income Tax Expense (Benefit) Award Timing Method Award Timing Method [Text Block] Consolidation Consolidation, Policy [Policy Text Block] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Public Warrants Public Warrants Public Warrant [Member] Public Warrant Revision of estimated asset retirement obligation Revision of estimate Asset Retirement Obligation, Revision of Estimate Net loss attributable to NET Power Inc. 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