NET Power (NPWR) 10-K 11 Mar 24 2023 FY Annual report Financial data

Cover

Cover - USD ($)	12 Months Ended
	Dec. 31, 2023	Mar. 07, 2024	Jun. 30, 2023
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Current Fiscal Year End Date	--12-31
Document Period End Date	Dec. 31, 2023
Document Transition Report	false
Entity File Number	001-40503
Entity Registrant Name	NET Power Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	98-1580612
Entity Address, Address Line One	320 Roney St.
Entity Address, Address Line Two	Suite 200
Entity Address, City or Town	Durham
Entity Address, State or Province	NC
Entity Address, Postal Zip Code	27701
City Area Code	(919)
Local Phone Number	287-4750
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 271,915,748
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE Portions of the definitive Proxy Statement for the registrant’s 2024 Annual Meeting of Stockholders have been incorporated by reference into Part III of this Report.
Entity Central Index Key	0001845437
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Amendment Flag	false
Class A Common Stock
Document Information [Line Items]
Title of 12(b) Security	Class A Common Stock
Trading Symbol	NPWR
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		71,960,052
Warrants, each exercisable for one share of Class A Common Stock at a price of $11.50
Document Information [Line Items]
Title of 12(b) Security	Warrants, each exercisable for one share ofClass A Common Stock at a price of $11.50
Trading Symbol	NPWR-WT
Security Exchange Name	NYSE
Class B ordinary shares
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		141,801,811

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2023
Auditor Information [Abstract]
Auditor Name	GRANT THORNTON LLP
Auditor Location	Raleigh, North Carolina
Auditor Firm ID	248

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets
Cash and cash equivalents	$ 536,927	$ 5,164
Short-term investments	100,000	0
Accounts receivables, net	58	352
Interest receivable	1,942	0
Prepaid expenses	1,777	184
Other current assets	93	1,795
Total current assets	640,797	7,495
Long-term assets
Intangible assets, net	1,307,265	263
Goodwill	423,920	0
Property, plant and equipment, net	96,856	69,595
Lease right-of-use asset	2,212	784
Total long-term assets	1,830,253	70,642
Total assets	2,471,050	78,137
Current liabilities
Accounts payable	617	577
Accrued liabilities	10,915	2,392
Due to related parties	142	178
Lease liability	347	130
Option liability	0	5,174
Total current liabilities	12,021	8,451
Long-term liabilities
Due to related parties	0	2,212
Earnout Shares liability	1,671	0
Warrant liability	55,920	0
Asset retirement obligation	2,060	2,416
Lease liability	1,808	656
Tax Receivable Agreement liability	8,937	0
Deferred taxes	57,719	0
Total long-term liabilities	128,115	5,284
Total liabilities	140,136	13,735
Commitments and contingencies (Note 14)
Mezzanine shareholders' and members' equity
Redeemable non-controlling interests in subsidiary	1,545,905	0
Shareholders' and members' equity
Membership Interests: 4,987,845 units authorized; 3,722,355 units issued and outstanding as of December 31, 2022 (Predecessor)	0	262,622
Preferred Stock, $.0001 par value; 1,000,000 shares authorized; no shares issued or outstanding as of December 31, 2023 (Successor) & December 31, 2022 (Predecessor)	0	0
Additional paid-in-capital	851,841	26,288
Accumulated other comprehensive income	0	17
Accumulated deficit
Shareholders' equity	(66,853)	(224,525)
Total shareholders' and members' equity	785,009	64,402
Total liabilities, mezzanine shareholders' and members' equity and shareholders' and members' equity	2,471,050	78,137
Class A Common Stock
Shareholders' and members' equity
Common stock, value, issued	7	0
Class B ordinary shares
Shareholders' and members' equity
Common stock, value, issued	$ 14	$ 0

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2023	Dec. 31, 2022
Common unit, authorized (in shares)		4,987,845
Common unit, outstanding (in shares)		3,722,355
Common unit, issued (in shares)		3,722,355
Preferred stock, par value (in dollars per share)	$ 0.0001
Preferred stock, shares authorized (in shares)	1,000,000
Preferred stock, shares outstanding (in shares)	0
Common stock, shares authorized (in shares)		4,987,845
Common stock, shares, issued (in shares)		3,722,355
Common stock, shares, outstanding (in shares)		3,722,355
Preferred Stock
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares outstanding (in shares)	0	0
Preferred stock, shares issued (in shares)	0	0
Class A Common Stock
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	520,000,000	520,000,000
Common stock, shares, issued (in shares)	71,277,906	0
Common stock, shares, outstanding (in shares)	71,277,906	0
Class B ordinary shares
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	310,000,000	310,000,000
Common stock, shares, issued (in shares)	141,787,429	0
Common stock, shares, outstanding (in shares)	141,787,429	0

Consolidated Statements of Oper

Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 07, 2023	Dec. 31, 2023	Dec. 31, 2022
Revenue	$ 175	$ 0	$ 580
Gross profit (loss)	172	0	305
Operating expenses
Sales and marketing	869	1,791	801
Project development	479	625	15
Option settlement – related party	0	79,054	0
Depreciation, amortization and accretion	5,812	45,031	13,387
Total operating expenses	34,322	193,510	50,330
Operating loss	(34,150)	(193,510)	(50,025)
Other income (expense)
Interest income (expense)	4	19,473	(4,791)
Change in Earnout Shares liability and Warrant liability	0	26,515	0
Other income (expense)	(30)	(1)	38
Net other income (expense)	(26)	45,987	(4,753)
Net loss before income tax	(34,176)	(147,523)	(54,778)
Income Tax Expense (Benefit)	0	(5,707)	0
Net loss after income tax	(34,176)	(141,816)	(54,778)
Net loss attributable to non-controlling interests	0	(98,760)	0
Comprehensive loss	(34,176)	(43,056)	(54,778)
Other comprehensive gain (loss)
Foreign currency translation gain (loss)	0	0	(3)
Total other comprehensive gain (loss)	0	0	(3)
Comprehensive loss	(34,176)	(141,816)	(54,781)
Comprehensive loss attributable to non-controlling interests	0	(98,760)	0
Comprehensive loss attributable to NET Power Inc.	$ (34,176)	$ (43,056)	$ (54,781)
Net loss per share of Class A Common Stock (Successor) or per membership interest (Predecessor), diluted (in dollars per share)	$ (9.07)	$ (0.62)	$ (14.79)
Net Loss per share of Class A Common Stock (Successor) or per membership interest (Predecessor), basic (in dollars per share)	$ (9.07)	$ (0.62)	$ (14.79)
Weighted average shares of Class A Common Stock or membership interests, diluted (in shares)	3,766,871	69,755,848	3,702,803
Weighted average shares of Class A Common Stock or membership interests, basic (in shares)	3,766,871	69,755,848	3,702,803
Nonrelated Party
Cost of revenue	$ 3	$ 0	$ 189
Operating expenses
General and administrative	12,684	41,260	16,685
Research and development	2,058	25,022	3,121
Related Party
Cost of revenue	0	0	86
Operating expenses
General and administrative	177	84	504
Research and development	$ 12,243	$ 643	15,817
Option settlement – related party			$ 0

Consolidated Statement of Share

Consolidated Statement of Shareholders’ Equity and Non-Controlling Interest (Successor) - USD ($) $ in Thousands	Total	NET Power, Inc.	NET Power, LLC.	RONI	Class A Common Stock	Class A Common Stock NET Power, Inc.	Class A Common Stock RONI	Class B ordinary shares	Common Stock Class A Common Stock	Common Stock Class A Common Stock NET Power, Inc.	Common Stock Class B ordinary shares	Common Stock Class B ordinary shares NET Power, Inc.	Common Stock Class B ordinary shares NET Power, LLC.	Common Stock Class A Ordinary Shares	Common Stock Class A Ordinary Shares NET Power, Inc.	Common Stock Class B Ordinary Shares	Common Stock Class B Ordinary Shares NET Power, Inc.	Additional Paid-in-Capital	Additional Paid-in-Capital NET Power, Inc.	Additional Paid-in-Capital NET Power, LLC.	Accumulated Deficit	Accumulated Deficit NET Power, LLC.	Total Stockholders' Equity	Total Stockholders' Equity NET Power, Inc.	Total Stockholders' Equity NET Power, LLC.	Non-controlling Interests	Non-controlling Interests NET Power, Inc.	Non-controlling Interests NET Power, LLC.
Common stock, beginning balance (in shares) at Dec. 31, 2022	3,722,355				0			0
Equity, beginning balance at Dec. 31, 2022	$ 64,402
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive loss	(34,176)
Common stock, ending balance (in shares) at Jun. 07, 2023									0		0			2,500		8,625,000
Equity, ending balance at Jun. 07, 2023									$ 0		$ 0			$ 0		$ 1		$ 0			$ (98,966)		$ (98,965)			$ 0
Temporary equity, ending balance (in shares) at Jun. 07, 2023					34,500,000
Temporary equity, ending balance at Jun. 07, 2023	356,318				$ 356,318
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Sponsor forfeiture of RONI Class B ordinary shares and reservation of earnout shares (in shares)																(1,986,775)
Redemption of Class A Common Stock (in shares)								3,868,618	3,868,618
Redemption of Class A Common Stock																		53,607					53,607			(53,607)
Conversion of RONI Class A and Class B ordinary shares into NET Power, Inc. Class A and Class B Common Stock, respectively (in shares)										13,307,276		6,638,225	129,822,703		(2,500)		(6,638,225)
Conversion of RONI Class A and Class B ordinary shares into NET Power Inc. Class A and Class B Common Stock, respectively										$ 1		$ 1	$ 12				$ (1)		$ 60,045	$ (940)		$ 75,711		$ 60,046	$ 74,783		$ 87,094	$ 1,677,546
Issuance of RONI Class A Common Stock to PIPE Investors (in shares)									54,044,995
Issuance of RONI Class A Common Stock to PIPE investors									$ 6									540,445					540,451
Issuance of Class A Common Stock (in shares)									54,278
Issuance of Class A Common Stock																		27					27
Equity awards vested due to Business Combination (in shares)											8,356,635
Equity awards vested due to Business Combination											$ 1							542			(542)		1			109,639
Exercise of Warrants (in shares)									2,739
Exercise of Warrants																		47					47
Distributions to members																										(181)
Establishment of liabilities under Tax Receivable Agreement, net of deferred taxes arising from qualifying exchanges																		(936)					(936)
Vesting of Earnout Shares																										9,055
Amortization of share based payments (in shares)													838,484
Amortization of share-based payments																		765					765			13,358
Carrying value adjustment of redeemable Non-controlling Interest																		198,239					198,239			(198,239)
Comprehensive loss	(141,816)																				(43,056)		(43,056)			(98,760)
Common stock, ending balance (in shares) at Dec. 31, 2023					71,277,906			141,787,429	71,277,906		141,787,429			0		0
Equity, ending balance at Dec. 31, 2023	785,009								$ 7		$ 14			$ 0		$ 0		$ 851,841			$ (66,853)		$ 785,009			$ 1,545,905
Increase (Decrease) in Temporary Equity [Roll Forward]
Redemption of Class A ordinary shares by RONI public shareholders (shares)							(21,195,224)
Redemption of Class A ordinary shares by RONI public shareholders	(53,607)			$ (218,983)			$ (218,983)
Temporary equity, conversion of RONI Class A and Class B ordinary shares into NET Power, Inc. Class A and Class B Common Stock, respectively (in shares)						(13,304,776)
Temporary equity, conversion of RONI Class A and Class B ordinary shares into NET Power, Inc. Class A and Class B Common Stock, respectively		$ (50,241)				$ (137,335)
Temporary equity, equity awards vested due to Business Combination	109,639
Temporary equity, issuance of RONI Class B Common Stock to Former NET Power, LLC Unitholders			$ 1,677,546
Temporary equity, member tax distributions	(181)
Temporary equity, vesting of earnout shares	9,055
Temporary equity, shares issued, value, share-based payment arrangement, forfeited	13,358
Temporary equity, adjustment of redeemable non-controlling interest to redemption value	(198,239)
Temporary equity, net loss	(98,760)
Temporary equity, ending balance (in shares) at Dec. 31, 2023					0				140,610,089		6,967,050
Temporary equity, ending balance at Dec. 31, 2023	$ 1,545,905				$ 0

Consolidated Statement of Membe

Consolidated Statement of Members’ Equity (Predecessor) - USD ($) $ in Thousands	Total	Occidental Petroleum	Constellation	BHES	BHES BHES Bonus Shares	BHES In-Kind Shares	Membership Interests	Membership Interests Occidental Petroleum	Membership Interests Constellation	Membership Interests BHES	Membership Interests BHES BHES Bonus Shares	Membership Interests BHES In-Kind Shares	Additional Paid-in-Capital	Additional Paid-in-Capital BHES BHES Bonus Shares	Additional Paid-in-Capital BHES In-Kind Shares	Accumulated Other Comprehensive Income	Accumulated Deficit
Common unit, outstanding, beginning balance (in shares) at Dec. 31, 2021							3,555,553
Beginning balance, members' equity at Dec. 31, 2021	$ 67,508						$ 227,960						$ 9,275			$ 20	$ (169,747)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share issuances (in shares)				142,180							17,799	6,823
Issuance of Class A Common Stock				$ 30,000	$ 9,858	$ 2,764				$ 2,765	$ 3,756	$ 1,439		$ 6,102	$ 1,325
(Less equity issuance costs)				$ (533)						(533)
Vesting of profits interests	9,586												9,586
Comprehensive loss	$ (54,781)															(3)	(54,778)
Common unit, outstanding, ending balance (in shares) at Dec. 31, 2022	3,722,355						3,722,355
Ending balance, members' equity at Dec. 31, 2022	$ 64,402						$ 262,622						26,288			17	(224,525)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share issuances (in shares)								37,152	28,764			15,491
Issuance of Class A Common Stock		$ 11,859	$ 9,181		$ 4,690	$ 3,903		$ 11,859	$ 9,181	$ 3,902		$ 3,269		$ 4,690	$ 634
Vesting of profits interests	2,864												2,864
Comprehensive loss	(34,176)																(34,176)
Common unit, outstanding, ending balance (in shares) at Jun. 07, 2023							3,803,762
Ending balance, members' equity at Jun. 07, 2023	$ 62,723						$ 286,931						$ 34,476			$ 17	$ (258,701)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 07, 2023	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities
Net loss before income tax	$ (34,176)	$ (141,816)	$ (54,778)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	5,700	7,146	13,149
Amortization	9	37,735	22
Accretion	102	93	215
Non-cash interest expense	30	0	4,710
Non-cash lease expense	59	200	0
Loss on disposal of property, plant and equipment	0	7	0
Conversion of equity awards	0	86,585	0
Allowance for doubtful accounts	352	0	0
Deferred taxes	0	(5,707)	0
Change in fair value of Earnout Shares liability	0	(1,378)	0
Change in fair value of Warrant liability	0	(26,270)	0
Vesting of profits interests	2,864	0	9,586
Vesting of Earnout Shares	0	1,118	0
Share-based compensation	8,593	14,122	12,622
Changes in operating assets and liabilities:
Accounts receivables	0	(58)	(301)
Interest receivable	0	(1,942)	0
Prepaid expenses	(453)	(1,140)	470
Other current assets	1,765	38	(1,795)
Accounts payable	1,768	(1,957)	(1,137)
Accrued liabilities	(384)	(5,249)	752
Lease liabilities	(55)	(48)	0
Due to related parties – current	5,414	142	(2,357)
Due to related parties – long-term	(2,211)	0	2,212
Net cash used in operating activities	(10,623)	(38,379)	(16,630)
Cash flows from investing activities
Cash acquired as part of Business Combination	0	7,948	0
Purchase of short-term investments	0	(100,000)	0
Purchase of property, plant and equipment	(2,431)	(9,217)	(115)
Net cash used in investing activities	(2,431)	(101,269)	(115)
Cash flows from financing activities
Repurchase of redeemed Class A Ordinary Shares	0	(218,983)	0
Issuance of Class A Common Stock, including exercise of Warrants	0	74	0
Distributions to members	0	(181)	0
Proceeds from PIPE financing, net of issuance costs	0	540,451	0
Payment of transaction expenses	0	(11,722)	0
Member loan proceeds	0	0	2,000
Member loan repayments	0	0	(10,000)
Equity issuance costs	0	0	(533)
Net cash provided by financing activities	15,836	319,556	21,467
Net increase in cash	2,782	179,908	4,722
Effect of foreign currency exchange rate changes on cash	0	0	(3)
Cash and cash equivalents, beginning of period	5,164	7,946	445
Cash and cash equivalents, end of period	7,946	536,927	5,164
Supplemental disclosures of cash flow information
Cash paid for interest	0	0	81
Remeasurement of lease liabilities and right-of-use assets due to lease modification (Note 13)	0	1,472	0
Nonrelated Party
Cash flows from financing activities
Proceeds from share issuances	15,836	0	30,000
Related Party
Cash flows from financing activities
Proceeds from share issuances	$ 0	$ 9,917	$ 0

Organization and Operations

Organization and Operations	12 Months Ended
	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Operations	NOTE 1 — Organization and Operations Background NET Power Inc. (the "Company") is a clean energy technology company that has developed a proprietary process for producing electricity using a predominantly carbon dioxide working fluid that involves the capture and reuse, sale and sequestration of carbon dioxide (the "NET Power Cycle"). The NET Power Cycle is the subject of U.S. and foreign patents, as well as additional applications and provisional applications on file with the United States Patent and Trademark Office and international patent authorities. Business Combination On December 13, 2022, NET Power, LLC entered into a Business Combination Agreement with Rice Acquisition Corp. II ("RONI"), Rice Acquisition Holdings II LLC ("RONI OpCo"), Topo Buyer Co, LLC ("Buyer") and Topo Merger Sub, LLC ("Merger Sub"). On June 8, 2023 (the "Closing Date"), Merger Sub merged with and into NET Power, LLC, with NET Power, LLC continuing as the surviving entity, resulting in it becoming a majority-owned, direct subsidiary of Buyer. RONI OpCo, a subsidiary of RONI, renamed itself NET Power Operations LLC ("OpCo") and RONI renamed itself NET Power Inc. upon completion of the merger (the "Business Combination"). The Business Combination resulted in an umbrella partnership, C corporation or "Up-C" structure. OpCo is a variable interest entity ("VIE") in accordance with the guidance in Accounting Standards Codification ("ASC") Topic 810, Consolidation ("ASC 810"); therefore, RONI represented the accounting acquirer within the Business Combination structure. The Company elected push-down accounting for the Business Combination and recorded the push-down entries at OpCo. ASC 810 requires that a reporting entity that possesses a controlling financial interest in a VIE consolidate that VIE. A controlling financial interest will have both of the following characteristics: (a) the power to direct the activities that most significantly impact the VIE's economic performance; and (b) the obligation to absorb the VIE's losses and the right to receive benefits that are significant to the VIE. The Company determined that OpCo continued to meet the definition of a VIE after the Business Combination and that the Company became the primary beneficiary of OpCo beginning on the Closing Date of the Business Combination (Note 3); therefore, the Company has consolidated OpCo from the date of the Business Combination. As a result of the Business Combination, the Company's financial statement presentation distinguishes NET Power, LLC as the "Predecessor" through June 7, 2023 (the "Predecessor Period") and NET Power Inc. as the "Successor" for periods after the Closing Date (the "Successor Period"). Revenue and earnings after the date of the Business Combination are shown in the Successor Period on the consolidated statement of operations and comprehensive loss. As a result of the application of the acquisition method of accounting in the Successor Period, the consolidated financial statements for the Successor Period are presented on a full step-up basis; therefore, Successor Period consolidated financial statements are not comparable to the consolidated financial statements of the Predecessor Period, which are not presented on the same full step-up basis. Reference Note 3 for further discussion of the Business Combination. Basis of Presentation The accompanying consolidated financial statements are prepared in conformity with accounting principles generally accepted in the United States of America ("US GAAP"). Certain prior period amounts have been reclassified to conform to current period presentation. The consolidated financial statements include the accounts of subsidiaries that NET Power Inc. consolidated according to the rules set forth in ASC 810. The Company consolidates all wholly-owned subsidiaries and subsidiaries in which it owns a 50.0% or greater ownership interest and all VIE's to which it is deemed to represent the primary beneficiary, as described below. These consolidated financial statements include the accounts of all wholly-owned subsidiaries and consolidated VIE's. Intercompany balances have been eliminated through the consolidation process.

Basis of Presentation and Signi

Basis of Presentation and Significant Accounting Policies	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Basis of Presentation and Significant Accounting Policies	NOTE 2 — Significant Accounting Policies Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make certain estimates, judgments and assumptions. The Company believes that the estimates, judgments and assumptions made when accounting for items and matters such as, but not limited to, depreciation, amortization, asset valuations and share-based compensation based on information available at the time they are made. These estimates, judgments and assumptions can affect the reported amounts of assets and liabilities as of the date of the consolidated financial statements, as well as amounts reported on the consolidated statement of operations and comprehensive loss during the periods presented. Actual results could differ from those estimates. Business Combinations The Company applies the guidance within ASC Topic 805, Business Combinations ("ASC 805") to all merger and acquisition transactions, including the Business Combination (Note 3), through which the Company obtains control over one or more other businesses. The Company applies the acquisition method for all transactions and other events through which the Company obtains control over one or more other businesses, including the Business Combination (Note 3). Under the acquisition method, assets acquired and liabilities assumed are measured at fair value as of the acquisition date. Liabilities related to contingent consideration are recognized on the acquisition date and remeasured at fair value in each subsequent reporting period, if the contingent consideration is liability classified. Goodwill is recognized as the excess of the consideration transferred over the fair value of the net identifiable assets acquired. Segment Reporting In accordance with ASC Topic 280— Segment Reporting ("ASC 280"), the Company has one operating segment and one reportable segment, which comprises all of the Company's consolidated accounts. The Company has one line of business. The Company has determined that its chief operating decision maker is a committee comprised of the following members of management: chief executive officer, chief financial officer and chief operational officer and president. The chief operating decision makers review financial information presented for the purposes of assessing performance and making decisions on how to allocate resources at the overall company level. Revenue Recognition, Trade Receivables and Allowance for Doubtful Accounts The Company follows the guidance within ASC Topic 606, Revenue from Contracts with Customers to determine how and when it recognizes revenues. The Company recognizes revenue when its performance obligations with its customers have been satisfied. To determine revenue recognition for contracts within the scope of ASC 606, the Company (i) identifies the contract(s) with a customer; (ii) identifies the performance obligations in the contract; (iii) determines the transaction price; (iv) allocates the transaction price to the performance obligations; and (v) recognizes revenue when (or as) the entity satisfies the performance obligation. The Company accounts for a customer contract when both parties have approved the contract and are committed to perform their respective contractual obligations, each party's rights can be identified, payment terms can be identified, the contract has commercial substance and it is probable that the Company will collect the consideration to which it is entitled. When billed in advance, the payment is deferred and recognized upon delivery of the service. Collectability is assessed based on a number of factors including collection history and customer creditworthiness. If collectability of substantially all consideration to which the Company is entitled under the contract is determined to be not probable, revenue is not recorded until collectability becomes probable. Revenue is recorded based on the transaction price excluding amounts collected on behalf of third parties, such as sales taxes collected and remitted to governmental authorities. Trade receivables are recorded at the invoiced amount and do not bear interest. The Company calculates an allowance for doubtful accounts based on a risk assessment performed when trade receivables are recognized. The allowance is calculated in accordance with ASC Topic 326, Current Expected Credit Losses . Write-offs are recorded at the time when trade receivables are deemed uncollectible. Fair Value Certain assets and liabilities are carried at fair value in accordance with ASC Topic 820, Fair Value Measurement . Fair value is defined as the price that would be received for an asset or paid to transfer a liability (i.e., the exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The guidance establishes a fair value hierarchy that prioritizes the inputs used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are as follows: • Level 1—Unadjusted quoted prices in active markets for identical assets or liabilities; • Level 2—Significant other observable inputs other than Level 1 prices, such as quoted prices for similar, but not identical, assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; or other inputs that are observable or can be corroborated by observable market data; and • Level 3—Significant unobservable inputs in which there is little or no market data available and requires the Company to develop its own assumptions that market participants would use in pricing an asset or liability. Assets and liabilities measured at fair value are classified in their entirety based on the lowest level of any input that is significant to the fair value measurement. The Company's estimates of fair values are based upon assumptions believed to be reasonable, but which are uncertain and involve significant managerial judgments made by considering factors specific to the asset or liability. The determination of fair value requires more judgment to the extent the valuation is based on models or inputs that are less observable or unobservable in the market. Accordingly, the degree of judgment exercised by the Company in determining the fair value is greatest for instruments categorized as Level 3. The Company's recurring fair value measurements comprise the Private Placement Warrants, the Public Warrants, the Earnout Shares (as defined in Note 11) and short-term investments (Note 9). Cash and Cash Equivalents Cash consists of liquid deposits at banking institutions that are members of the Federal Deposit Insurance Corporation ("FDIC"). FDIC guidelines guarantee $250 per depositor, per insured bank. As of December 31, 2023 (Successor) and December 31, 2022 (Predecessor), the Company held cash in excess of FDIC limits equal to $334,289 and $4,644 respectively. As defined within ASC Topic 230, Statement of Cash Flows , cash equivalents represent short-term, highly liquid investments that are both readily convertible to cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, the Company considers highly liquid investments with original maturities of three months or less as cash equivalents. As of December 31, 2023 (Successor), cash equivalents of $202,138 are not covered by the FDIC program. The carrying value of cash and cash equivalents equals its fair value. Short-Term Investments The Company classifies investments with maturities greater than three months but less than one year as short-term investments. As of December 31, 2023 (Successor), the Company's short-term investment balance consisted of a single six-month certificate of deposit custodied by a domestic banking institution. Short-term investments are classified as held-to-maturity according to the guidance contained within ASC Topic 320, Investments — Debt Securities ("ASC 320") because the Company has the intent and ability to hold the certificate of deposit until maturity. Interest income generated from short-term investments is recorded as Interest income (expense) on the Company's consolidated statement of operations and comprehensive loss. Interest accrued on short-term investments is recorded as interest receivable on the consolidated balance sheets. Investments in Securities In accordance with ASC 320, the Company classifies investments in fixed maturity securities at the acquisition date and reevaluates the classification at each balance sheet date. Held-to-maturity investments are carried at amortized cost, reflecting the ability and intent to hold the securities to maturity. Trading investments are securities acquired with the intent to sell in the near term and are carried at fair value with changes in fair value reported in earnings. All other fixed maturity securities are classified as available-for-sale and are carried at fair value with net unrealized gains or losses related to non-credit factors reported as a component of accumulated other comprehensive income. The difference between the original cost and maturity value of a fixed maturity security is amortized to earnings using the interest method. The primary objectives of the Company's investment portfolio are to maintain the safety of invested capital, provide prudent levels of liquidity to accommodate operational and capital needs and maintain an acceptable level of risk. These risks include credit risk, interest rate risk and concentration risk, which are mitigated through the creation of a diversified investment portfolio consisting of liquid and high credit quality financial instruments. As required by ASC Topic 326, Financial Instruments—Credit Losses , the Company reviews its available-for-sale securities portfolio for impairment and determines if impairment is due to credit losses or other reasons. In making the assessment of whether a loss arises from credit or other factors, management considers the extent to which fair value is less than amortized cost, any changes to the rating of the security by a rating agency and adverse conditions related to the security, among other factors. If this assessment indicates that a credit loss exists, the present value of cash flows expected to be collected from the security are compared to the amortized cost basis of the security. If the present value of cash flows is less than the amortized cost basis, a credit loss exists and an allowance is created, limited by the amount that the fair value is less than the amortized cost basis. Subsequent activity related to the credit loss component (e.g. write-offs, recoveries) is recognized as part of the allowance for credit losses on available-for-sale securities. The Company did not hold any investments in securities as of either December 31, 2023 (Successor) or December 31, 2022 (Predecessor), respectively. Warrants The Company issued Public Warrants and Private Placement Warrants (as defined in Note 3) prior to the consummation of the Business Combination. The Company accounts for both the Public Warrants and Private Placement Warrants as liability-classified instruments based on an assessment of the Warrants' specific terms and applicable authoritative guidance outlined in ASC Topic 480, Distinguishing Liabilities from Equity ("ASC 480"), ASC Topic 815, Derivatives and Hedging ("ASC 815") and relevant SEC reporting rules. The guidance considers whether the Warrants are freestanding financial instruments pursuant to ASC 480, whether the Warrants meet the definition of a liability pursuant to ASC 480, whether the Warrants meet all of the requirements for equity classification under ASC 815 and whether class of equity into which the Warrants settle possess substantive voting rights. This assessment is conducted at the time of the instruments’ issuance and at each subsequent quarterly period end date while the Warrants remain outstanding. In compliance with ASC 815, the Company accounts for the outstanding Warrants as a liability at fair value on the consolidated balance sheets. The Warrants are subject to remeasurement at each reporting date with any change in the fair value recognized in Change in Earnout Shares liability and Warrant liability on the Company's consolidated statement of operations and comprehensive loss. Tax Receivable Agreement Liability As part of the Business Combinations, the Company entered into the Tax Receivable Agreement ("TRA") with certain OpCo unitholders that will represent approximately 75% of the calculated tax savings based on the portion of basis adjustments on exchanges of OpCo units and other carryforward attributes that are anticipated to be able to be utilized in future years. Such tax attributes include the existing tax basis of certain assets of OpCo and its consolidated subsidiaries; tax basis adjustments resulting from taxable exchanges of Class A OpCo Units; certain tax benefits realized by NET Power Inc. as a result of the Business Combination and tax deduction in respect of portions of certain TRA payments. All such payments made under the terms of the TRA are the obligations of NET Power Inc. and not of OpCo. Reference Note 15 for additional information about the TRA Liability. Intangible Assets The Company accounts for definite-lived intangible assets, in accordance with ASC Topic 350, Goodwill and Other Intangible Assets ("ASC 350"). Intangible assets are comprised entirely of developed technology related tot he NET Power Cycle, which the Company amortizes over a 20-year useful life. Goodwill The Company recognizes goodwill in accordance with ASC 350. Goodwill represents the excess costs of an acquired entity over the amounts assigned to assets acquired and liabilities assumed in a business combination. The Company's goodwill is not tax deductible. Goodwill is not amortized but is tested annually for impairment. The Company assesses its goodwill value for impairment annually as of October 1. Impairment exists when the carrying amount of the reporting unit exceeds its fair value and an impairment loss is recognized. The Company determined that no impairment charges for goodwill were required to be recognized during the period ended December 31, 2023. Prepaid Expenses Prepaid expenses consist of costs paid in advance for software and other subscriptions, patent renewal fees, general liability insurance and employee health insurance. Property, Plant and Equipment Property, plant and equipment is generally recorded at the historical cost to acquire the assets. The costs bases of property, plant and equipment to which the Company held title prior to the Business Combination (Note 3) were stepped-up to their respective fair values on June 8, 2023 in accordance with the closure of the Business Combination. Depreciation is calculated on the straight-line method over the estimated useful lives of the respective assets. Amounts capitalized to construction in progress are not depreciated until the underlying asset is placed into service. The following table summarizes the estimated useful lives used to depreciate property, plant and equipment and assets: Asset Classification Useful Life Furniture and Equipment 4 – 7 Demonstration Plant 7 Property, plant and equipment is presented at cost less accumulated depreciation on the consolidated balance sheets. Impairment of Long-Lived Assets In accordance with ASC Topic 360, Property, Plant and Equipment , tangible and intangible assets with finite useful lives are evaluated for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets placed in service is measured by comparing the carrying amount of an asset or asset group to the future undiscounted cash flows expected to be generated by the asset or asset group. If such assets are considered to be impaired, the impairment equals the amount by which the carrying amount of the assets exceeds the fair value of the assets. There were no impairment charges recorded during the period from June 8, 2023 through December 31, 2023 (Successor), January 1, 2023 through June 7, 2023 (Predecessor) or during the year ended December 31, 2022 (Predecessor). Leases Lease agreements may fall within two categories according to ASC Topic 842, Leases ("ASC 842"), operating leases or financing leases. Both operating and finance leases result in the recognition of lease liabilities and associated right-of-use assets that are valued at the net present value of the lease payments and recognized. The Company has elected the short-term lease exception and therefore only recognizes right-of-use assets and lease liabilities for leases with a term greater than one year. The lease term includes the committed lease term identified in the contract, taking into account renewal and termination options that management is reasonably certain to exercise. The Company also elected to not separate lease components and non-lease components when allocating contract consideration to leases of commercial office space. The discount rate used in the measurement of a right-of-use asset and lease liability is the rate implicit in the lease whenever that rate is readily determinable. If the rate implicit in the lease is not readily determinable, the Company uses its incremental borrowing rate as a proxy for the discount rate based on the term of the lease. Asset Retirement Obligation The Company recognizes liabilities for future obligations associated with the retirement of assets. The fair values of legal obligations to retire and remove long-lived assets are recorded in the period in which the obligation is incurred. When an asset retirement obligation arises, the liabilities and corresponding assets are recorded at their present values using a discounted cash flow approach and the liabilities are accreted using the interest method. The asset retirement obligations that have been recorded to-date relate to the Company's obligation to restore the property underneath the Demonstration Plant at the end of the Demonstration Plant's estimated useful life as required by the lease terms. The accretion expense generated by the Company's asset retirement obligation liability is recognized ratably over the Demonstration Plant's expected seven-year useful life. Net Loss per Unit During the Predecessor Period, the Company computed basic net loss per unit by dividing the total net loss applicable to membership interest holders by the weighted average number of membership interests outstanding during the period. The Company computed diluted net loss per unit by dividing the net loss applicable to membership interest holders by the sum of the weighted-average number of membership interests outstanding during the period and the potentially dilutive effects of distribution units, profits interests and options to purchase membership interests. Such items were excluded if their effect was anti-dilutive. Since the impact of the distribution units, profits interests, and options to purchase membership interests were anti-dilutive during periods of net loss, there was no difference between the Company's basic and diluted net loss per unit for the period from January 1, 2023 through June 7, 2023 (Predecessor) or the year ended December 31, 2022 (Predecessor). Net Loss per Share During the Successor Period, basic net loss per share is computed based on the weighted average number of shares of Class A Common Stock outstanding. Diluted net loss per share is computed based on the weighted average number of common shares outstanding, increased by the number of any additional shares that would have been outstanding had any potentially dilutive common shares been issued. For the purposes of the diluted earnings per share calculation, Warrants, Earnout Shares (as defined in Note 11), restricted stock units and conversion of OpCo Units are excluded from the calculation for the period from June 8, 2023 through December 31, 2023 (Successor), as the inclusion would be anti-dilutive due to the losses reported in the year. Share Based Compensation The Company applies ASC Topic 718, Share-Based Payments ("ASC 718") to account for its equity awards. In accordance with ASC 718, the Company recognizes expense related to equity awards for which vesting is considered probable. Forfeitures are recognized as they occur. For service-based awards, compensation cost is measured at fair value on the grant date and expensed ratably over the vesting term. For performance-based grants, the fair value is measured on the grant date and recognized as non-cash compensation expense, considering the probability of the targets being achieved. Subsequent to the Business Combination, the Company uses the publicly quoted price on the grant date to estimate the fair value of the award. The Company recognizes compensation expense generated by all service-based awards on a straight-line basis over the underlying awards' vesting period. Compensation expense from share-based awards is recorded as General and administrative expense in the consolidated statement of operations and comprehensive loss. Prior to the Business Combination, equity awards granted to employees included unvested membership units in NET Power, LLC. The estimated fair value of NET Power, LLC membership units was determined by an independent, external valuation service provider at each equity grant date until the Closing Date, upon which the Company became publicly traded. On the Closing Date, the Company fair valued the OpCo Units used to satisfy outstanding share-based awards at the fair value of the Company's Class A Common Stock. Earnout Shares and Restricted Shares Unvested Earnout Shares (as defined in Note 11) are reported as liabilities on the Company's consolidated balance sheets. The liability classification reflects the interpretation that the Earnout Share settlement provision contingent on a change in control event does not represent an input into a fixed-for-fixed option pricing model. The usage of a model other than a fixed-for-fixed option model results in liability classification pursuant to the guidance in ASC 815. The Price Based Lockup Shares and the Time-Based Lockup Shares (as defined in Note 11) are included as equity within the Company's consolidated balance sheets. Non-Controlling Interest Non-controlling interests ("NCI") represent ownership positions of OpCo held by sponsors, certain strategic partners and owners of NET Power, LLC prior to the Business Combination. After the conversion of Class B OpCo Units to Class A OpCo Units in the Business Combination, NCI is comprised exclusively of Class A OpCo Units (Note 11). After evaluating Class A OpCo Unit redemption rights under ASC 480, the Company determined that Class A OpCo Units are subject to potential cash redemption that rests outside the Company's control. The Company has classified NCI as a component of mezzanine equity in consideration of this cash redemption feature and in accordance with the guidance in ASC 810. The Company measures redeemable NCI each quarter at the higher of its book value or its redemption value, which equals the closing price of the Company's Class A Common Stock on the measurement date. As of December 31, 2023 (Successor), the book value was higher than the redemption value of non-controlling interests. The change in measurement is shown as the carrying value adjustment of redeemable Non-Controlling Interest in the Company's consolidated statement of shareholders' equity and non-controlling interest. The Company's net loss before income tax and the non-tax components of comprehensive loss in the Successor Period are reduced by the portion of net loss before income tax and the non-tax components of comprehensive loss, respectively, attributable to non-controlling interests. Research and Development Costs The Company expenses costs related to operations and testing at the Demonstration Plant, as well as engineering and design costs related to development of the NET Power Cycle as incurred. These costs are included in Research and development expense on the consolidated statement of operations and comprehensive loss. Related Parties The Company applies ASC Topic 850, Related Parties and prevailing SEC guidance to classify and report transactions with related parties. The Company has entered into contractual relationships with several of its current shareholders and former members that qualify as related parties according to the aforementioned criteria. These relationships include loans from members and master service agreements ("MSA's"). Reference Note 8 for additional information. Income Taxes The Company applies the guidance set forth in ASC Topic 740, Income Taxes ("ASC 740") to evaluate its tax positions. The Company evaluates the realizability of deferred tax assets on a quarterly basis and establishes a valuation allowance when it is more-likely-than-not that all or a portion of a deferred tax asset may not be realized. In making such a determination, the Company considers all positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax planning strategies and recent results of operations. NET Power Inc. consolidates the financial results of OpCo in its consolidated financial statements. OpCo represents a pass-through entity for U.S. federal and most applicable state and local income tax purposes. As a pass-through entity for tax purposes, OpCo is not subject to U.S. federal and certain state and local income taxes. Any taxable income or loss generated by OpCo is passed through to its members, including NET Power Inc., which is taxed as a corporation that pays corporate federal, state and local taxes with respect to income allocated from OpCo based on its economic interest in OpCo. During the Predecessor Period, NET Power, LLC's results of operations do not include any material provisions for U.S. federal income tax because NET Power, LLC represents a pass-through entity for federal income tax purposes. Recently Adopted Accounting Standards During November, 2023, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2023-07, Segment Reporting (Topic 280) — Improvements to Reportable Segment Disclosures ("ASU 2023-07"). ASU 2023-07 requires that public entities include the following segment disclosures in its interim and annual financial statements: significant segment expenses that are regularly provided to the chief operating decision maker ("CODM") and included within each reported measure of segment profit or loss; an amount for other segment items, which comprise segment revenue less segment expenses and measures of segment profit or loss by reportable segment, and a description of their compositions; additional measures of segment profit, subject to qualifications, if the CODM uses more than one measure of a segment's profit or loss in assessing segment performance and deciding how to allocate resources; and the title and position of the CODM and an explanation of how the CODM uses the reported measure(s) of segment profit or loss in assessing segment performance and deciding how to allocate resources. ASU 2023-07 requires public entities that have a single reportable segment to provide all of these disclosures and all existing segment disclosures in ASC 280. ASU 2023-07 is effective for all annual reporting periods beginning after December 15, 2023 and for all interim reporting periods beginning after December 15, 2024. Early adoption is permitted. The Company incorporated ASU 2023-07's relevant disclosure requirements by identifying the CODM and clarifying that the Company's single reportable segment comprises all of the consolidated financial statements in Note 2. The disclosure requirements related to significant segment expenses, other segment items and measures of segment profit did not affect the Company's consolidated financial statements. Accounting Standards Not Yet Adopted During October, 2023, the FASB issued ASU 2023-06, Disclosure Improvements: Codification Amendments in Response to the SEC ' s Disclosure Update and Simplification Initiative ("ASU 2023-06"). ASU 2023-06 incorporates 14 of the 27 disclosure requirements published in Securities and Exchange Commission ("SEC") Release No. 33-10532, Disclosure Update and Simplification into various topics within the Accounting Standards Codification . ASU 2023-06’s amendments represent clarifications to, or technical corrections of, current requirements. For SEC registrants, the effective date for each amendment will be the date on which the SEC removes that related disclosure from its rules. Early adoption is prohibited. The Company does not expect ASU 2023-06 will have a material effect on its consolidated financial statements. During December, 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740) — Improvements to Income Tax Disclosures ("ASU 2023-09"). ASU 2023-09 requires public business entities to provide annually a tabular reconciliation of the reported income tax expense (or benefit) from continuing operations to the product of the income (or loss) from continuing operations before income taxes and the applicable statutory federal income tax rate using specified categories and to disclose separately reconciling items within certain categories with absolute values equal to or greater than five percent of the product of the income (or loss) from continuing operations before tax and the applicable statutory tax rate. Additionally, ASU 2023-09 requires a public business entity to disclose the year-to-date amount of income taxes paid, net of refunds received, to federal, state and foreign jurisdictions. If a payment to a single federal, state or foreign jurisdiction equals or exceeds five percent of total income taxes paid, ASU 2023-09 requires separate disclosure of that payment. Finally, ASU 2023-09 requires a public business entity to disclose income (or loss) from continuing operations before income tax expense (or benefit) disaggregated between domestic and foreign jurisdictions and to disclose income tax expense (or benefit) from continuing operations disaggregated between federal, state and foreign jurisdictions. ASU 2023-09 removes the requirement to disclose the nature and estimate of the range of reasonably possible increases or decreases in the unrecognized tax benefits balance in the next 12 months, or to make a statement that an estimate of the range cannot be made. ASU 2023-09 is effective for public business entity calendar years beginning after December 15, 2024. Early adoption is permitted. The Company is evaluating the effect ASU 2023-09 will have on its consolidated financial statements.

Business Combination

Business Combination	12 Months Ended
	Dec. 31, 2023
Business Combination and Asset Acquisition [Abstract]
Business Combination	NOTE 3 — Business Combination RONI, a Cayman Islands exempted company, was organized as a blank check company formed for the purpose of effecting a merger, capital stock exchange, asset acquisition, stock purchase, reorganization or similar business combination with one or more businesses. On June 18, 2021, RONI completed its IPO, generating gross proceeds of approximately $345,000. The net proceeds from the IPO were subsequently placed in a trust account for the intended purpose of consummating a business combination. As discussed in Note 1, the Business Combination was consummated on June 8, 2023. The result of the Business Combination generated the following financial results: • The Business Combination generated $121,883 of expenses, including $16,021 of acquirer expenses recorded "on-the-line" because they would not have been incurred had the Business Combination not closed. • In contemplation of the Business Combination, the Company modified certain outstanding profits interests awards, a portion of which vested during the pre-combination period. The Company included $325 of previously vested, modified profits interests issued to the award recipient as consideration transferred to sellers. • Certain outstanding profits interests, which were not modified in contemplation of the Business Combination, that vested during the pre-combination period and that were issued to recipients as part of the Business Combination were included in consideration transferred to sellers. The total fair value of previously vested, unmodified profits interests included in consideration transferred to sellers equaled $651. • All outstanding NET Power, LLC member interests converted into 136,073,365 vested Class A OpCo Units and a corresponding number of vested shares of Class B Common Stock, 1,119,198 unvested Class A OpCo Units and 1,119,198 unvested shares of Class B Common Stock upon completion of the Business Combination. • The Company registered and issued 67,352,271 shares of Class A Common Stock on the New York Stock Exchange ("NYSE"). • The Company recorded 8,624,974 Public Warrants exercisable into 8,624,974 shares of Class A Common Stock at a price of $11.50 per share (the "Public Warrants"). The Company may redeem the Public Warrants for $0.01 if the last reported trading price of the Company's Class A Common Stock price equals or exceeds $18.00 per share for any 20 trading days within a 30-trading day period. Additionally, the Public Warrants may be redeemed if the last reported trading price of the Company's Class A Common Stock equals or exceeds $10.00 and is below $18.00 by paying a make-whole premium. The Public Warrants expire five years after the Closing Date. • The Company recorded 10,900,000 Private Placement Warrants, which are exercisable for 10,900,000 shares of Class A Common Stock at a price of $11.50 per share (the "Private Placement Warrants," and collectively with the Public Warrants, the "Warrants"). The Private Placement Warrants expire five years after the Closing Date. The Private Placement Warrants are exercisable on a cashless basis and are non-redeemable as long as they are held by the initial purchasers or their permitted transferees. The Private Placement Warrants and Class A Common Stock issuable upon exercise of the Private Placement Warrants are entitled to registration rights. • The Company recorded $71,426 of deferred tax liabilities, which represent the difference between NET Power Inc.'s tax basis and its US GAAP basis in OpCo, with an offsetting entry to goodwill. The basis difference is primarily attributable to the Company's developed technology and its Demonstration Plant asset. • The Company received $661,623 of cash net of certain expenses paid on the Closing Date. The Business Combination was accounted for using the acquisition method of accounting. The fair value of the total purchase consideration transferred was $1,786,259. The following table summarizes the total consideration transferred in the Business Combination: Consideration Transferred Total Pre-combination vesting of modified profits interests $ 325 Pre-combination vesting of unmodified profits interests 651 Consideration transferred to sellers 976 Class A OpCo Units - non-controlling interests 1,785,283 Fair value of total consideration transferred $ 1,786,259 The following table sets forth the fair value of the assets and liabilities assumed in connection with the Business Combination: Total Assets acquired Current assets Cash $ 7,946 Prepaid expenses 637 Other current assets 30 Total current assets 8,613 Long-term assets Intangible assets, net 1,345,000 Property, plant and equipment 91,855 Right-of-use assets 940 Total long-term assets 1,437,795 Total assets acquired $ 1,446,408 Liabilities assumed Current liabilities Accounts payable $ 2,574 Accrued liabilities 7,370 Current lease liability 137 Other current liabilities 1 Total current liabilities 10,082 Long-term liabilities Deferred tax liability 71,426 Asset retirement obligation 1,967 Long-term lease liability 594 Total long-term liabilities 73,987 Total liabilities assumed 84,069 Total identifiable net assets 1,362,339 Goodwill 423,920 Net assets acquired $ 1,786,259 The following methodologies were used to estimate the fair value of the acquired assets and liabilities: • Cash, prepaid expenses, accounts payable and accrued liabilities were recorded at their historical book values as that approximates fair value. • Developed technology was valued using a multi-period excess earnings method income approach. Leases were valued using the yield capitalization method income approach. The income approach is a general way of developing a value indication for an asset using one or more methods that convert anticipated economic benefits into a present single amount. • Personal property was valued using the indirect cost method. The cost approach is a general way of estimating the value of an asset by determining the amount of money required to replace the asset with another asset having equivalent utility. The purchase price allocation is subject to change upon finalizing the tax returns for the year ended December 31, 2023 (Successor), which the Company expects to occur prior to the one year anniversary of the acquisition date. Unaudited Pro-Forma Information The following table presents unaudited pro forma information as if the Business Combination occurred as of January 1, 2022 (Predecessor). The unaudited pro forma information reflects adjustments for additional amortization resulting from the fair value re-measurement of assets acquired and liabilities assumed, for alignment of accounting policies, and transaction expenses as if the Business Combination occurred on January 1, 2022 (Predecessor). The unaudited pro forma results do not include any anticipated cost synergies or other effects of the combined company. Accordingly, pro forma amounts are not necessarily indicative of the results that actually would have occurred had the Business Combination been completed on the date indicated, nor are they indicative of the Company's future operating results. Year Ended December 31, 2023 2022 Pro forma revenue $ 175 $ 580 Pro forma net loss $ (205,387) $ (121,652) Pro forma net loss attributable to non-redeemable controlling interest $ (67,778) $ (40,145) Pro forma net loss attributable to non-redeemable non-controlling interests $ (137,609) $ (81,507)

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	NOTE 4 — Goodwill and Intangible Assets Goodwill Goodwill represents the future economic benefits derived from the Company's unique market position, the growth attributable to the NET Power Cycle and the Company's assembled workforce, none of which are individually and separately recognized as intangible assets. Goodwill is allocated to the Company's sole reportable segment and reporting unit. The following table presents the Company's goodwill balance as of December 31, 2023 (Successor): Goodwill at June 8, 2023 (Successor) $ 433,736 Measurement Adjustments (9,816) Goodwill at December 31, 2023 (Successor) $ 423,920 Current period measurement adjustments of $9,816 reflect the effects of changes to deferred tax liability estimates calculated as part of the purchase price allocation that accompanied the Business Combination. Definite Lived Intangible Assets The following tables present the Company's definite lived intangible assets as of December 31, 2023 (Successor) and December 31, 2022 (Predecessor) are as follows: December 31, 2023 (Successor) December 31, 2022 (Predecessor) Developed technology, gross $ 1,345,000 $ 604 Accumulated amortization (37,735) (341) Developed technology, net $ 1,307,265 $ 263 Amortization expense for the period from January 1, 2023 through June 7, 2023 (Predecessor) and the period from June 8, 2023 through December 31, 2023 (Successor) was $9 and $37,735, respectively. Amortization expense for the year ended December 31, 2022 (Predecessor) was $22. Periodic amortization expense excludes expenses attributable to goodwill, which is not amortized. The Company does not own or control any intangible assets with indefinite useful lives except goodwill. The following table presents estimated amortization expense for the next five years and thereafter: 2024 $ 67,250 2025 67,250 2026 67,250 2027 67,250 2028 67,250 2029 and thereafter 971,015 Total $ 1,307,265

Property, Plant, and Equipment

Property, Plant, and Equipment	12 Months Ended
	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	NOTE 5 — Property, Plant and Equipment The following table summarizes the key classifications of property, plant and equipment as of December 31, 2023 (Successor) and December 31, 2022 (Predecessor): December 31, 2023 (Successor) December 31, 2022 (Predecessor) Furniture and equipment, gross $ 320 $ 368 Demonstration Plant, gross 89,241 128,013 Construction in progress 14,441 — Total property, plant and equipment, gross 104,002 128,381 Accumulated depreciation (7,146) (58,786) Total property, plant and equipment, net $ 96,856 $ 69,595 Depreciation expense for the period from January 1, 2023 through June 7, 2023 (Predecessor) and the period from June 8, 2023 through December 31, 2023 (Successor) was $5,700 and $7,146, respectively. Depreciation expense for the year ended December 31, 2022 (Predecessor) was $13,149.

Accrued Liabilities

Accrued Liabilities	12 Months Ended
	Dec. 31, 2023
Payables and Accruals [Abstract]
Accrued Liabilities	NOTE 6 — Accrued Liabilities Accrued liabilities as of December 31, 2023 (Successor) and December 31, 2022 (Predecessor) are as follows: December 31, 2023 (Successor) December 31, 2022 (Predecessor) Accrued incentive compensation $ 2,016 $ 1,451 Accrued cash-based expense of BHES JDA 3,669 — Accrued legal service provider fees 160 713 Accrued capital expenditures 3,605 — Other accrued liabilities 1,465 228 Total accrued liabilities $ 10,915 $ 2,392

Revenue and Accounts Receivable

Revenue and Accounts Receivable	12 Months Ended
	Dec. 31, 2023
Receivables [Abstract]
Revenue and Accounts Receivable	NOTE 7 — Revenue and Accounts Receivable Revenue The following table disaggregates the Company's revenue streams into its major sub-components: June 8 – December 31, 2023 (Successor) January 1 – June 7, 2023 (Predecessor) January 1 - December 31, 2022 (Predecessor) Feasibility studies $ — $ 175 $ 125 Test data sales — — 150 Testing services — — 305 Total revenue $ — $ 175 $ 580 Feasibility studies revenue comprises studies conducted on behalf of potential licensees to determine the applicability of the NET Power Cycle to the counterparty's specific use case. The Company's performance obligations associated with feasibility studies are satisfied over time because the customer simultaneously receives and consumes the benefits as the Company delivers the relevant reports. The Company measures progress under these arrangements using an output method based on contract phases reached. Test data sales comprises the sale to potential licensees of access to testing results and other data associated with testing performed at the Demonstration Plant. The Company's performance obligations associated with test data contracts are satisfied over time because the customer simultaneously receives and consumes the benefits as the Company performs. The Company measures progress under these arrangements using an output method based on contract phases reached. Testing services revenue comprised reimbursement of costs associated with the performance of testing on behalf of a customer at the Demonstration Plant. The Company's performance obligations associated with testing services are satisfied over time because the grant recipient received the benefit simultaneous to the Company's performance. The Company was compensated based on expenses incurred plus an administrative markup. The Company measured progress under this arrangement using an input method based on costs incurred. Expenses related to the project were recorded as Cost of revenue on the consolidated statement of operations and comprehensive loss and submitted for reimbursement with an administrative markup. Performance Obligations Revenue recognized under contracts with customers exclusively includes the performance obligations satisfied in the applicable reporting period and excludes all performance obligations satisfied in prior reporting periods. As of December 31, 2023 (Successor), the Company recorded no transaction prices allocated to open performance obligations. Accounts Receivable Accounts receivable, net as of December 31, 2023 (Successor) and December 31, 2022 (Predecessor) includes the following balances: December 31, 2023 (Successor) December 31, 2022 (Predecessor) Accounts receivable, gross $ 58 352 Allowance for doubtful accounts — — Accounts receivable, net $ 58 $ 352 During the period from January 1, 2023 through June 7, 2023 (Predecessor), the Company recorded bad debt expense associated with its accounts receivables equal to $352 within General and administrative expense on the consolidated statement of operations and comprehensive loss, respectively. During the periods from June 8, 2023 through December 31, 2023 (Successor) and the year ended December 31, 2022 (Predecessor), the Company did not record any bad debt expense associated with its accounts receivable.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2023
Related Party Transactions [Abstract]
Related Party Transactions	NOTE 8 — Related Party Transactions The following table summarizes the related party amounts on the consolidated balance sheets: December 31, 2023 (Successor) December 31, 2022 (Predecessor) Amounts due to related parties under MSA $ 142 $ 178 Due to related parties - current $ 142 $ 178 Amounts due to related parties under BHES JDA $ — $ 2,212 Due to related parties - long-term $ — $ 2,212 The following table summarizes the related party amounts on the consolidated statement of operations and comprehensive loss for the periods presented: June 8 – December 31, 2023 (Successor) January 1 - June 7, 2023 (Predecessor) Year Ended December 31, 2022 (Predecessor) MSA costs related to testing services $ — $ — $ 86 Cost of revenue – related party $ — $ — $ 86 MSA administrative costs $ 84 $ 79 $ 247 Engineering support provided by former board member — 97 230 Engineering services provided by former investor — — 27 General and administrative – related party $ 84 $ 177 $ 504 MSA costs for Demonstration Plant $ 643 $ 530 $ 984 BHES JDA — 11,713 14,833 Research and development – related party $ 643 $ 12,243 $ 15,817 Option settlement – related party $ 79,054 $ — $ — MSA A significant shareholder has provided the Company with marketing services, patent administration services and technology maintenance services related to the development of the NET Power Cycle. The total cost incurred for these services was $79 and $84 during the period from January 1, 2023 through June 7, 2023 (Predecessor) and the period from June 8, 2023 through December 31, 2023 (Successor), respectively. The total cost incurred for these services was $247 during the year ended December 31, 2022 (Predecessor). These totals are included in General and administrative – related party on the consolidated statement of operations and comprehensive loss. Another shareholder supports the Company with regard to general business oversight and with the operation of the Demonstration Plant. The total cost incurred for these services was $530 and $643 during the period from January 1, 2023 through June 7, 2023 (Predecessor) and the period from June 8, 2023 through December 31, 2023 (Successor), respectively. The total cost incurred for these services was $984 during the year ended December 31, 2022 (Predecessor). These totals are reflected in Research and development – related party on the consolidated statement of operations and comprehensive loss. The Company had $142 and $178 in current liabilities payable to related parties as of December 31, 2023 (Successor) and December 31, 2022 (Predecessor), respectively, on the consolidated balance sheets related to these services. These related party payables are unsecured and are due on demand. Engineering Support Provided by Former Board Member A shareholder who is also a former board member, supported the Company with regard to general business oversight and with the operation of the Demonstration Plant. The total cost incurred for these services was $97 during the period from January 1, 2023 through June 7, 2023 (Predecessor). The total cost incurred for these services was $230 for the year ended December 31, 2022 (Predecessor). These expenses are reflected in Research and development – related party on the consolidated statement of operations and comprehensive loss prior to the Business Combination. The counterparty ceased being a related party on June 8, 2023 upon completion of the Business Combination. BHES JDA Additionally, the Company has an agreement with a shareholder as discussed in Note 14. Transactions under the BHES JDA are included in Research and development – related party on the consolidated statement of operations and comprehensive loss prior to the Business Combination. Subsequent to the Business Combination, transactions under the BHES JDA are included in Research and development on the consolidated statement of shareholders' equity and non-controlling interest because BHES ceased being a related party on June 8, 2023. The Company had $2,212 in long-term liabilities payable to related parties as of December 31, 2022 (Predecessor) on the consolidated balance sheets related to this agreement. Option Settlement

Fair Value Measurement

Fair Value Measurement	12 Months Ended
	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Fair Value Measurement	NOTE 9 — Fair Value Measurement The following table presents information about the Company's liabilities that are measured at fair value on a recurring basis as of December 31, 2023 (Successor) and indicates the fair value hierarchy of the valuation inputs the Company utilized to determine each asset's and each liability's fair value: Assets Level 1 Level 2 Level 3 Total Short-term Investments $ — $ 100,000 $ — $ 100,000 Total $ — $ 100,000 $ — $ 100,000 Liabilities Level 1 Level 2 Level 3 Total Public Warrants $ 18,969 $ — $ — $ 18,969 Private Placement Warrants — — 36,951 36,951 Earnout Shares — — 1,671 1,671 Total $ 18,969 $ — $ 38,622 $ 57,591 The following table presents information about the Company's liabilities that were measured at fair value on a recurring basis as of December 31, 2022 (Predecessor) and indicates the fair value hierarchy of the valuation inputs the Company utilized to determine the liability’s fair value: Liabilities Level 1 Level 2 Level 3 Total Option Liability $ — $ — $ 5,174 $ 5,174 Total $ — $ — $ 5,174 $ 5,174 The following table presents a reconciliation of the beginning and ending balances of recurring level 3 fair value measurements: June 8 – December 31, 2023 (Successor) January 1 – June 7, 2023 (Predecessor) January 1 - December 31, 2022 (Predecessor) Balance of recurring level 3 liabilities at beginning of period $ 63,851 $ 5,174 $ 1,459 Change in Earnout Shares liability and Warrant liability (16,174) — — Change in Option liability — — 3,715 Issuances (9,055) — — Payments — (5,174) — Balance of recurring level 3 liabilities at end of period $ 38,622 $ — $ 5,174 Earnout Shares The fair values for the Earnout Shares are estimated using a Monte Carlo simulation. The Monte Carlo simulation considers daily simulated stock prices as a proxy for the Company's daily volume-weighted average share price. The key inputs into the valuation of the Earnout Shares are an expected term of three years, a risk-free rate of 4.1% and estimated equity volatility of 38.5%. The estimated equity volatility assumption is based on a blended average of asset and equity volatility measurements of publicly traded companies within the Company's peer group. Warrants The Public Warrants are valued using their quoted and publicly available market prices. Since their fair value is predicated on quoted prices in an active market for identical instruments, the Public Warrants are considered to be Level 1 fair value instruments because their price is observable. The Company uses a Black-Scholes Merton Model to value the Private Placement Warrants. Key inputs into the Black-Scholes Merton Model include the Class A Common Stock closing price of $10.10 as of December 31, 2023 (Successor), the risk free rate of 3.8%, volatility of 39.4%, a term of five years and a strike price of $11.50 per share. The volatility assumption is based on a blended average of operating and equity volatility of publicly traded companies within the Company's peer group, the Company's own historical volatility and the implied volatility of the Public Warrants. The Private Placement Warrants are considered to be Level 3 fair value instruments because they are not traded on public markets; therefore, their price is not observable. Short-term Investments Short-term investments are valued at cost, which approximates fair value. Short-term investments are considered Level 2 fair value instruments because cost basis is not observable in a public market. Please reference Note 3 for a description of the terms of the Warrants. Option Liability The Company's option liability was issued in conjunction with member loans on October 15, 2021. The loans were fully repaid on February 3, 2022; however, the members had one year to exercise their options subsequent to the repayment of the loans. The interest expense related to these loan options was $30 during the period from January 1, 2023 through June 7, 2023 (Predecessor). These measurements were reported in Interest income (expense) on the consolidated statement of operations and comprehensive loss. In early 2023, two option holders exercised their options to purchase an aggregate of 34,588 membership units in NET Power, LLC for total proceeds of $5,836. There were no loan options outstanding at the time of the Business Combination.

Net Loss per Share_Unit

Net Loss per Share/Unit	12 Months Ended
	Dec. 31, 2023
Earnings Per Share [Abstract]
Net Loss per Share/Unit	NOTE 10 — Net Loss per Share/Unit Successor Period Basic net loss per share is computed based on the weighted average number of shares of Class A Common Stock outstanding. Diluted net income per share is computed based on the weighted average number of shares of Class A Common Stock outstanding, increased by the number of any additional shares of Class A Common Stock that would have been outstanding had any potentially dilutive shares of Class A Common Stock been issued and reduced by the number of shares of Class A Common Stock the Company could have repurchased from the proceeds from issuance of the potentially dilutive shares. For the purposes of the diluted earnings per share calculation, Warrants, Earnout Shares, BHES Bonus Shares (as defined in Note 12), unvested Class A OpCo Units and the potential conversion of vested OpCo Units are excluded from the net loss per share calculation for the period from June 8, 2023 through December 31, 2023 (Successor) because their inclusion would be anti-dilutive due to the losses reported in the Successor Period. Additionally, Earnout Shares and BHES Bonus Shares are excluded from the net loss calculation because the contingencies that would allow for those Earnout Shares to vest into OpCo Units have not yet been met. Based on the amounts outstanding at December 31, 2023 (Successor), the Company excluded the following financial instruments from the computation of diluted net loss per unit because their inclusion would be anti-dilutive due to the losses reported in the Successor Period: Anti-Dilutive Instrument December 31, 2023 (Successor) Public Warrants 8,622,235 Private Placement Warrants 10,900,000 Earnout Shares 328,925 BHES Bonus Shares 2,068,416 Unvested Class A OpCo Units 848,415 Vested Class A OpCo Units 141,304,030 Unvested RSU's 443,221 Total 164,515,242 Only shares of Class A Common Stock participate in the Company's undistributed earnings. As such, the Company's undistributed earnings are allocated entirely to the Class A Common Stock based on the weighted-average number of shares of Class A Common Stock outstanding for the period from June 8, 2023 through December 31, 2023 (Successor). The following table sets forth the computation of the Company's basic and diluted net loss per share for the period from June 8, 2023 through December 31, 2023 (Successor): Class A Common Stock Numerator Net loss $ (141,816) Net loss attributable to shareholders $ (43,056) Denominator Weighted-average number shares outstanding, basic and diluted 69,756 Net loss per share attributable to shareholders, basic and diluted $ (0.62) Predecessor Period Basic net loss per unit is computed based on the weighted average number of membership interests outstanding. Diluted net loss per unit is computed based on the weighted average number of membership interests outstanding, increased by the number of any additional units that would have been outstanding had any potentially dilutive membership interests been issued and decreased by the number of membership interests the Company could have repurchased from the proceeds from issuance of the potentially dilutive membership interests. As of December 31, 2022 (Predecessor), the Company's anti-dilutive securities were profits interests, member loan share options and share options. Based on the amounts outstanding at December 31, 2022 (Predecessor), the Company excluded the following positions from the computation of diluted net loss per unit because their inclusion would be anti-dilutive due to the losses reported in the Predecessor Period: Anti-Dilutive Instrument December 31, 2022 (Predecessor) June 7, 2023 (Predecessor) Unvested profits interests 226,494 119,076 Member loan share options 34,588 — Occidental Petroleum share options 711,111 — Total 972,193 119,076 The following table sets forth the computation of the Company's basic and diluted net loss per unit for the period from January 1, 2023 through June 7, 2023 (Predecessor), and for the year ended December 31, 2022 (Predecessor), respectively: Period from January 1 - June 7, 2023 (Predecessor) Year Ended December 31, 2022 (Predecessor) Numerator Net loss $ (34,176) $ (54,778) Net loss attributable to membership interest holders $ (34,176) $ (54,778) Denominator Weighted-average number membership interests outstanding, basic and diluted 3,767 3,703 Net loss per unit attributable to membership interest holders, basic and diluted $ (9.07) $ (14.79)

Shareholders' Equity and Non-Co

Shareholders' Equity and Non-Controlling Interest	12 Months Ended
	Dec. 31, 2023
Equity [Abstract]
Shareholders' Equity and Non-Controlling Interest	NOTE 11 — Shareholders' Equity and Non-Controlling Interest Successor Period The Company's equity consists of a total of 831,000,000 authorized shares across all classes of capital stock, which the Company has the authority to issue. The 831,000,000 authorized shares consist of 1,000,000 authorized shares of Preferred Stock with a par value of $0.0001 per share, 520,000,000 authorized shares of Class A Common Stock with a par value of $0.0001 per share, and 310,000,000 shares of Class B Common Stock with a par value of $0.0001 per share. As of December 31, 2023 (Successor), the Company had no outstanding shares of Preferred Stock, 71,277,906 outstanding shares of Class A Common Stock, and 141,787,429 outstanding shares of Class B Common Stock. Class A Common Stock is entitled to one vote for each share on all matters submitted to a vote of the stockholders and do not have cumulative voting rights. Class A Common Stock is entitled to receive dividends (payable in cash, stock or otherwise), if any, as may be declared from time to time by the Company's Board of Directors (the "Board"). In the event of liquidation, dissolution, distribution of assets or other winding up, Class A Common Stock is entitled to receive ratably the assets available for distribution to the stockholders after payment of liabilities and the liquidation preference of any outstanding shares of Preferred Stock. Class B Common Stock is not transferable except in connection with a permitted transfer of a corresponding number of OpCo Units. Class B Common Stock is entitled to one vote per share on all matters to be voted upon by the holders of Common Stock. Holders of shares of Class A Common Stock and Class B Common Stock vote together as a single class on all matters presented to stockholders subject to certain exceptions. Class B Common Stock does not have the right to receive dividends, unless the dividend consists of shares of Class B Common Stock or of rights, options, warrants or other securities convertible or exercisable into or redeemable for shares of Class B Common Stock paid proportionally with respect to each outstanding share of Class B Common Stock and a dividend consisting of shares of Class A Common Stock or of rights, options, warrants or other securities convertible or exercisable into or redeemable for shares of Class A Common Stock on the same terms is simultaneously paid to the holders of Class A Common Stock. Class B Common Stock does not have any right to receive a distribution upon a liquidation or winding up of the Company. As of December 31, 2023 (Successor), redeemable non-controlling interests are comprised of 140,610,089 vested Class A OpCo Units, of which 6,967,050 units were formerly vested Class B OpCo Units. Class A OpCo Units are exchangeable for shares of Class A Common Stock or redeemable for cash. Additionally, the Company holds a call right that enables it to redeem Class A OpCo Units for shares of Class A Common Stock or cash once the unit holder has elected to redeem the equity instrument. After considering the effects of consolidation, the Company owns 33.0% of OpCo and NCI holders own the residual 67.0%. The table below demonstrates the calculation of net loss before income tax attributable to redeemable non-controlling interest holders for the June 8, 2023 through December 31, 2023 (Successor) period and the June 8, 2023 through December 31, 2023 (Successor) period: Period from June 8 - December 31, 2023 (Successor) Net Loss before income tax $ (147,523) Redeemable non-controlling interest percentage - Class A OpCo Units 67.0 % Net Loss before income tax attributable to Class A OpCo Units $ (98,760) Earnout Shares and Restricted Shares As part of the Business Combination (Note 3), 128,908,518 Class A OpCo Units and a corresponding number of shares of Class B Common Stock, 7,624,999 Class B OpCo Units and a corresponding number of shares of Class B Common Stock and 54,047,495 shares of Class A Common Stock owned by the Sponsor, the Sponsor's affiliates and private investors were subjected to certain vesting and transfer restrictions. Upon conversion of Class B OpCo Units to Class A OpCo Units, the 6,072,463 Class B OpCo Units subject to vesting and transfer restrictions became Class A OpCo Units. Of the total shares subject to vesting and transfer restrictions, 986,775 Class A OpCo Units, all of which were formerly Class B OpCo Units, and a corresponding number of shares of Class B Common Stock vest in three equal tranches contingent upon the share price of the Class A Common Stock or the occurrence of a change in control event (the "Earnout Shares"). The first tranche vests if the closing price of the Class A Common Stock on the NYSE is greater than or equal to $12.00 for any 20 trading days within a consecutive 30-trading-day period beginning on or after June 23, 2023. The second tranche vests if the closing price of the Class A Common Stock on the NYSE is greater than or equal to $14.00 for any 20 trading days within a consecutive 30-trading-day period beginning on or after June 23, 2023. The third tranche vests if the closing price of the Class A Common Stock on the NYSE is greater than or equal to $16.00 for any 20 trading days within a consecutive 30-trading-day period beginning on or after June 23, 2023 and ending on the three-year anniversary of the Closing Date. Of the OpCo Units subject to transfer restrictions, 44,544,551 Class A OpCo Units, of which 1,575,045 were formerly Class B OpCo Units, (the "Price-Based Lock-up Shares") may not be transferred until after the three-year anniversary of the Closing Date; provided, however, that if the last sale price of the Class A Common Stock on the NYSE, for any 20 trading days within any 30 consecutive trading-day period commencing on or after June 23, 2023 exceeds (or, in the case of the 1,575,045 Class A OpCo Units that were formerly Class B OpCo Units, equals) (i) $12.00 per share, then one-third of the Price-Based Lock-up Shares will no longer be subject to such lock-up restrictions, (ii) $14.00 per share, then an additional one-third of the Price-Based Lock-up Shares will no longer be subject to such lock-up restrictions, and (iii) $16.00 per share, then all of the Price-Based Lock-up Shares will no longer be subject to such lock-up restrictions. The remaining 89,449,655 Class A OpCo Units, of which 3,510,643 were formerly Class B OpCo Units (the "Time-Based Lock-up Shares") subject to transfer restrictions may not be transferred until after the one-year anniversary of the Closing Date; provided, however, that if the last sale price of the Class A Common Stock on the NYSE, for any 20 trading days within any 30 consecutive trading-day period commencing on or after December 8, 2023, exceeds (or in the case of the 3,510,643 Class A OpCo Units that were formerly Class B OpCo Units, equals) $12.00 per share, then the Time-Based Lock-up Shares will no longer be subject to such lock-up restrictions. On August 16, 2023, pursuant to the OpCo limited liability company agreement, all Class B OpCo Units converted into Class A OpCo Units on a one-for-one basis due to the exercise on such date by an OpCo Unitholder of its Class B OpCo Unit conversion right, which allowed the holder to convert its own Class B OpCo Units into Class A OpCo Units on a one-for-one basis. During the period from June 8, 2023 through December 31, 2023 (Successor), the Company's Class A Common Stock achieved the $12.00 per share and $14.00 per share prices necessary to cause two-thirds of the Earnout Shares to vest and to remove the lock-up provision from two-thirds of the Price-Based Lock-Up Shares. As of December 31, 2023 (Successor), 328,925 Class A OpCo units and a corresponding number of shares of Class B Common Stock included in the Earnout Shares remain unvested. As of December 31, 2023 (Successor), 14,848,184 Price-Based Lockup Shares remain restricted. Predecessor Period The Company's equity in the Predecessor Period comprised a single class of membership interests. The Company's members’ equity as of December 31, 2022 (Predecessor) included 4,987,845 authorized membership interests, of which 3,722,355 were issued and outstanding. Due to the absence of an active market for the Company's membership interests, the Company utilized methodologies in accordance with the framework of the American Institute of Certified Public Accountants Technical Practice Aid— V aluation of Privately-Held Company Equity Securities Issued as Compensation to estimate the fair value of its membership interests. The estimated fair value of the membership interests was determined at each grant date based upon a variety of factors, including price of equity issuances by the Company, the Company's financial position, historical financial performance, the Company's developed, external market conditions affecting any trends within the industry and the likelihood of achieving a liquidity event.

Share-Based Payments

Share-Based Payments	12 Months Ended
	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Share-Based Payments	NOTE 12 — Share-Based Payments OpCo Unit Awards (Predecessor and Successor) As of December 31, 2023 (Successor), there was $2,352 of unrecognized share-based compensation expense related to unvested Class A OpCo Units granted under previous programs, which the Company expects to recognize over a weighted average period of three years. As of December 31, 2022 (Predecessor), there was $9,312 of unrecognized share-based compensation expense related to unvested equity awards granted under previous programs, which the Company expects to recognize over a weighted average period of one year. Pursuant to the Business Combination Agreement (Note 3), the Company agreed to amend the settlement provisions of certain unvested, outstanding profits interests previously issued by NET Power, LLC (the "Replacement Awards"). Unvested Replacement Awards that would have originally settled into NET Power, LLC membership interests will now settle into Class A OpCo Units and a corresponding number of shares of Class B Common Stock. The number of Class A OpCo Units and shares of Class B Common Stock into which the Replacement Awards will settle is calculated so that the settlement value approximates the value of NET Power, LLC membership interests into which the profits interests would have settled. The Replacement Awards will continue to vest over the original applicable service periods and are subject to the same performance conditions as the profits interests. Compensation cost associated with the Replacement Awards is recognized over the requisite service period as the Company evaluates the probability of performance conditions’ achievement. The following table presents a summary of employee equity awards comprised of Class A OpCo Units and the corresponding quantity of shares of Class B Common Stock outstanding, granted, forfeited, vested on an accelerated basis and redeemed during the current year-to-date: Quantity Calculated Value Period from June 8 - December 31, 2023 (Successor) Period from January 1 - June 7, 2023 (Predecessor) Period from June 8 - December 31, 2023 (Successor) Period from January 1 - June 7, 2023 (Predecessor) Unvested, beginning of period 1,895,122 226,494 $ 4.95 $ 63.25 Granted — — $ — $ — Forfeited (324,568) — $ 5.66 $ — Vested (30,069) (107,418) $ 4.32 $ 63.18 Accelerated (692,070) — $ 4.32 $ — Unvested, end of period 848,415 119,076 $ 4.62 $ 63.32 Accelerated Vesting and Forfeiture of Certain Profits Interests Also pursuant to the Business Combination Agreement, the Company agreed to accelerate the vesting of certain unvested profits interests upon completion of the Business Combination. The Business Combination resulted in the immediate vesting of 30,000 profits interests, which equated to 451,356 Class A OpCo Units and a corresponding number of shares of Class B Common Stock, that generated $1,624 in compensation cost, which was directly attributed to the transaction on June 8, 2023. The expense generated by the accelerated vesting of certain profits interests is recorded in General and administrative within the June 8 through December 31, 2023 (Successor) period on the consolidated statement of operations and comprehensive loss. Additionally, the Business Combination resulted in the forfeiture of 30,000 unvested profits interests, which equated to 324,568 Class A OpCo Units and a corresponding number of shares of Class B Common Stock. This forfeiture did not affect the compensation expense recorded on the consolidated statement of operations and comprehensive loss because the awards were unvested at the time of forfeiture. Restricted Stock Units (Successor) In conjunction with the Business Combination, the Board and RONI's shareholders approved the 2023 Omnibus Incentive Plan. The 2023 Omnibus Incentive Plan initially reserves 20,468,545 shares of Class A Common Stock for issuance as equity awards. The quantity of shares of Class A Common Stock reserved for grant under the 2023 Omnibus Incentive Plan will be subject to an annual increase on the first day of each calendar year beginning January 1, 2024, and ending and including January 1, 2033, equal to the lesser of (i) 5% of the aggregate number of shares outstanding on December 31 of the immediately preceding calendar year and (ii) any such smaller number of shares as is determined by the Board. During the period from June 8, 2023 through December 31, 2023 (Successor), the Company authorized the issuance of 443,221 RSU's under the terms of the Omnibus Incentive Plan. As of December 31, 2023 (Successor), there was $5,188 of unrecognized share-based compensation expense related to unvested RSU's, which the Company expects to recognize over a weighted average period of three years The following table presents a summary of RSU's outstanding, granted, forfeited, vested and accelerated during the period from; June 8, 2023 through December 31, 2023 (Successor): Quantity Fair Value Unvested, beginning of period — $ — Granted 443,221 $ 13.43 Forfeited — $ — Vested — $ — Accelerated — $ — Unvested, end of period 443,221 $ 13.43 Awards granted to employees and the majority of executives cliff-vest on the three-year anniversary date of the grant. Awards granted to independent directors and certain executives use a graded vesting schedule over the three-year period that begins on each award's grant date. BHES JDA (Predecessor and Successor) The following table presents the quantity and value of equity issued to Baker Hughes Energy Services LLC ("BHES") as payment for costs incurred pursuant to the Original JDA and the Amended and Restated JDA (Note 14). The portion of BHES JDA costs that the Company pays with Class A OpCo Units and shares of Class B Common Stock is recorded within additional paid in capital on the consolidated balance sheets and the consolidated statement of shareholders' equity and non-controlling interest. The table below displays the fair value of shares distributed as payment for services rendered by BHES under the terms of the BHES JDA. Quantity Total Fair Value Period from June 8 - December 31, 2023 (Successor) Period from January 1 - June 7, 2023 (Predecessor) Period from June 8 - December 31, 2023 (Successor) Period from January 1 - June 7, 2023 (Predecessor) Equivalent Value per Unit or per Share (1) Membership Interests — 9,210 $ — $ 1,943 $ 168.75 Class A OpCo Units 1,236,265 296,160 8,172 1,958 $ 5.29 Class B Common Stock 1,236,265 296,160 — — $ — Total $ 8,172 $ 3,901 ___________ (1) The Equivalent Value per Unit is the discounted price per membership interest or per share stipulated in the BHES JDA. Shares used as payment under the terms of the Amended and Restated JDA are issued at a discount expected to cause a total loss of approximately $17,500 to the Company. The Company has incurred inception-to-date losses of $2,971 related to such issuances. BHES may earn additional shares under the terms of the Amended and Restated JDA ("BHES Bonus Shares") if it meets certain contractually stipulated project milestones related to the development of the Demonstration Plant. The Company determined that BHES's achievement of each of these milestones is probable in accordance with the guidance in ASC 718; therefore, the Company recognizes the compensation cost associated with milestone share-based payments ratably over the expected service period. The following table disaggregates the variable compensation payable to BHES should it meet its milestone objectives: Performance Period End Date Compensation Cost Incurred To Date Remaining Compensation Cost Total Compensation Cost BHES JDA - variable share-based payments January, 2027 $ 21,167 $ 6,178 $ 27,345 Additionally, BHES received 47,000 membership interests that converted into 1,500,265 Class A OpCo Units and a corresponding number of shares of Class B Common Stock in conjunction with the consummation of the Business Combination (Note 3).

Leases

Leases	12 Months Ended
	Dec. 31, 2023
Leases [Abstract]
Leases	NOTE 13 — Leases As of December 31, 2023 (Successor), the Company had two leases, both of which are classified as operating leases. The following table presents the future minimum lease payments that the Company expects to make under its operating leases: Year Future Minimum Lease Payments 2024 $ 504 2025 517 2026 531 2027 545 2028 512 2029 and thereafter — Total $ 2,608 Lease cost for the period from January 1, 2023 through June 7, 2023 (Predecessor) and the period from June 8, 2023 through December 31, 2023 (Successor) was $260 and $85, respectively. Lease cost for the year ended December 31, 2022 (Predecessor) was $95. Lease costs are recorded as General and administrative expense on the consolidated statement of operations and comprehensive loss. Office Lease On June 6, 2022, the Company entered into an office space lease agreement (the "Measurement Building Lease"), which became effective on November 1, 2022 and had an original lease term of 60 months from the signing date. The lease was classified as an operating lease and the lease liability was calculated using an incremental borrowing rate of 8.0%. On August 11, 2023, the Company agreed to terminate the Measurement Building Lease, effective October 6, 2023, and entered into a new office lease agreement (the "Roney St. Lease"). The Roney St. Lease began on October 6, 2023 and has a term of 62 months from the commencement date. The simultaneous termination of the Measurement Building Lease and execution of the Roney St. Lease represents a single transaction accounted for as a modification of the Measurement Building Lease. As such, the Company remeasured the lease liabilities and right-of-use asset associated with the Measurement Building Lease and recognized those balances over the amended, remaining lease term. As of December 31, 2023 (Successor), the Company had $2,155 in lease liabilities and $2,059 in right-of-use assets attributable to the Roney St. Lease on its consolidated balance sheets. The Roney St. Lease includes an early termination option that enables the Company to end the lease on or after its 50th month. As of December 31, 2023 (Successor), the Company determined that it is unlikely to exercise this termination option; therefore, the above minimum lease payments, as well as the right-of-use asset and liability associated with the Roney St. Lease, do not consider the effects of this termination option on the lease term. Land Lease The Company leases the land under the Demonstration Plant. The lease expires on the earlier of (i) July 1, 2025 or (ii) the termination of the Company's oxygen supply agreement with the lessor. Lease payments for the land equal one dollar per year. In conjunction with the Business Combination (Note 3), the Company revalued its land lease at its fair value, which involved a comparison of the land lease's terms against comparable market lease terms. As of December 31, 2023 (Successor), the value of the right-of-use asset attributable to the Demonstration Plant land lease was $153.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	NOTE 14 — Commitments and Contingencies Litigation In conjunction with the Business Combination (Note 3), the Company entered into a settlement agreement with a RONI shareholder related to certain disclosures made in the registration statement filed by RONI for the Business Combination. The settlement amount did not have a material effect on the consolidated financial statements of the Company. Asset Retirement Obligation The Company's valuation of the asset retirement obligation related to the Demonstration Plant encompasses an estimate for the cost to restore the site as required by lease terms. The following table reconciles the beginning and ending balances of the asset retirement obligation for each period presented: Period from June 8 – December 31, 2023 (Successor) Period from January 1 – June 7, 2023 (Predecessor) Year Ended December 31, 2022 (Predecessor) Asset retirement obligation, beginning of period $ 1,967 $ 2,416 $ — Obligation incurred — — 2,201 Periodic accretion expense 93 102 215 Asset retirement obligation, end of period $ 2,060 $ 2,518 $ 2,416 Unconditional Purchase Obligations The Company has committed to purchase industrial components for installation at its Demonstration Plant and its first commercial power plant. The Company pays for these components in installments aligned to contractual milestones specified by each commitment's counterparty. In accordance with ASC Topic 440, Commitments , the Company does not recognize these commitments on the consolidated balance sheets. The following table presents the Company's material, unrecognized purchase obligations: Commitment Consideration Type Gross Commitment Period from June 8 - December 31, 2023 (Successor) Period from January 1 - June 7, 2023 (Predecessor) Prior Predecessor Periods Remaining Commitment Asset purchase commitments Cash $ 26,009 $ 4,023 $ 1,168 $ — $ 20,818 BHES JDA Cash 70,000 6,536 3,121 2,211 58,132 BHES JDA Share-Based 70,000 6,536 3,121 2,211 58,132 Total $ 166,009 $ 17,095 $ 7,410 $ 4,422 $ 137,082 BHES JDA On February 3, 2022, the Company entered into a Joint Development Agreement with affiliates of BHES, which is a shareholder (the "Original JDA"). The Original JDA's counterparties subsequently amended the agreement's terms on June 30, 2022 and December 13, 2022 (the "Amended and Restated JDA", and collectively with the Original JDA, the "BHES JDA"). The Amended and Restated JDA represents a contract that engages BHES to invest in, develop and deploy the NET Power Cycle in collaboration with the Company. The Amended and Restated JDA entitles BHES to payments of cash and equity in exchange for services related to the development and commercialization of the technology. The Company records the measurement of services provided by BHES within Research and development on the consolidated statement of operations and comprehensive loss. Prior to the Business Combination, the Company used membership interests to compensate BHES for its services under the BHES JDA (Note 12). After the Business Combination, the Company uses Class A OpCo Units and corresponding quantities of Class B Common Stock to compensate BHES for its services under the BHES JDA (Note 12). The following table presents the costs associated with the BHES JDA during the periods presented : Period from June 8 – December 31, 2023 (Successor) January 1 – June 7, 2023 (Predecessor) January 1 – December 31, 2022 (Predecessor) Cash expense $ 6,536 $ 3,121 $ 2,211 Membership interests issued — 3,902 2,765 Class A OpCo Units issued 8,172 — — BHES Bonus Share expense 6,620 4,690 9,857 Total research and development attributable to BHES JDA $ 21,328 $ 11,713 $ 14,833 Prior to June 8, 2023 (Successor), the Company recorded costs incurred under the BHES within Research and development – related party on the consolidated statement of operations and comprehensive loss due to the size of their ownership of the Company and because an employee of BHES served on the Company's Board of Directors. Subsequent to the Business Combination, neither BHES nor its affiliates occupy seats on the Company's Board of Directors and its percentage of ownership fell below 5%; therefore, BHES no longer qualifies as a related party after June 7, 2023.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Income Taxes	NOTE 15 — Income Taxes Prior to the Closing Date, NET Power, LLC was considered a pass-through entity for state and federal income taxes. As such, NET Power, LLC's income or loss was allocated to its partners and no income tax expense (benefit) was recognized. The following table presents the components of the Company's current and deferred income taxes: June 8 - December 31, 2023 (Successor) Federal Current tax expense (benefit) $ — Deferred tax expense (benefit) (5,542) Total federal (5,542) State and local Current tax expense (benefit) — Deferred tax expense (benefit) (165) Total state and local (165) Total $ (5,707) The following table presents the Company's effective income tax rate during the period from June 8, 2023 through December 31, 2023 (Successor): June 8 - December 31, 2023 (Successor) U.S. federal statutory rate 21.0 % Increase (decrease) due to: State income taxes, net of federal income tax benefit 0.1 % Non-controlling interests (14.1) % Equity transactions (3.8) % Other permanent adjustments (0.5) % Change in investment in OpCo (2.5) % Valuation allowance 3.7 % Effective tax rate 3.9 % The following table presents the effects of temporary differences arising from deferred income taxes as of December 31, 2023 (Successor): December 31, 2023 (Successor) Deferred tax assets Federal net operating losses $ 1,976 State net operating losses 186 Investment in OpCo 62,972 Deferred tax assets, gross 65,134 Valuation allowance (62,972) Deferred tax assets, net 2,162 Deferred tax liabilities Property, plant and equipment and (59,881) Deferred tax liabilities, gross (59,881) Deferred tax liabilities, net $ (57,719) As of June 8, 2023 (Successor), the Company recorded a deferred tax asset of $77,700, which was fully reserved. The change in the valuation allowance of $14,728 from June 8, 2023 to December 31, 2023 corresponds to the change in the balance of the deferred tax asset attributable to NET Power Inc.'s investment in OpCo. The Company does not believe that this deferred tax asset is more-likely-than-not to be realized and has established a valuation allowance against it as of December 31, 2023 (Successor) . As of December 31, 2023 (Successor), the Company recorded no unrecognized tax benefits that, if recognized, would decrease the Company's effective tax rate. The measurement of unrecognized tax benefits is not expected to significantly change during the twelve months following the date of the consolidated balance sheets. Management evaluated the Company's tax positions and concluded that the Company had taken no uncertain tax positions that require adjustment to comply with applicable accounting guidance. The Company and its subsidiaries file U.S. federal income tax returns as well as tax returns in various state jurisdictions. OpCo files U.S. federal and state tax returns. Generally, tax years between 2020 and 2023 remain open to examination by the tax authorities in these jurisdictions. Although the outcomes of tax examination are uncertain, management believes that adequate provisions for income taxes have been made. If outcomes differ materially from management's estimates, those outcomes could have a material impact on the Company's financial condition and results of operations. Differences between actual results and assumptions or changes in assumptions in future periods are recorded in the period they become known. To the extent additional information becomes available prior to resolution, such accruals are adjusted to reflect probable outcomes. Tax Receivable Agreement As of December 31, 2023 (Successor), the Company recorded a liability of $8,937 related to its projected obligations under the TRA, which is recorded as Tax Receivable Agreement liability on the Company's consolidated balance sheets. This obligation arose because of qualifying exchanges of Class A OpCo Units that occurred during the period from June 8, 2023 through December 31, 2023 (Successor).

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 07, 2023	Dec. 31, 2023	Dec. 31, 2022
Pay vs Performance Disclosure
Comprehensive loss	$ (34,176)	$ (43,056)	$ (54,778)

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Dec. 31, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Basis of Presentation and Sig_2

Basis of Presentation and Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation
Consolidation	The consolidated financial statements include the accounts of subsidiaries that NET Power Inc. consolidated according to the rules set forth in ASC 810. The Company consolidates all wholly-owned subsidiaries and subsidiaries in which it owns a 50.0% or greater ownership interest and all VIE's to which it is deemed to represent the primary beneficiary, as described below. These consolidated financial statements include the accounts of all wholly-owned subsidiaries and consolidated VIE's. Intercompany balances have been eliminated through the consolidation process.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make certain estimates, judgments and assumptions. The Company believes that the estimates, judgments and assumptions made when accounting for items and matters such as, but not limited to, depreciation, amortization, asset valuations and share-based compensation based on information available at the time they are made. These estimates, judgments and assumptions can affect the reported amounts of assets and liabilities as of the date of the consolidated financial statements, as well as amounts reported on the consolidated statement of operations and comprehensive loss during the periods presented. Actual results could differ from those estimates.
Business Combinations	Business Combinations The Company applies the guidance within ASC Topic 805, Business Combinations ("ASC 805") to all merger and acquisition transactions, including the Business Combination (Note 3), through which the Company obtains control over one or more other businesses. The Company applies the acquisition method for all transactions and other events through which the Company obtains control over one or more other businesses, including the Business Combination (Note 3). Under the acquisition method, assets acquired and liabilities assumed are measured at fair value as of the acquisition date. Liabilities related to contingent consideration are recognized on the acquisition date and remeasured at fair value in each subsequent reporting period, if the contingent consideration is liability classified. Goodwill is recognized as the excess of the consideration transferred over the fair value of the net identifiable assets acquired.
Segment Reporting	Segment Reporting In accordance with ASC Topic 280— Segment Reporting
Revenue Recognition	Revenue Recognition, Trade Receivables and Allowance for Doubtful Accounts The Company follows the guidance within ASC Topic 606, Revenue from Contracts with Customers to determine how and when it recognizes revenues. The Company recognizes revenue when its performance obligations with its customers have been satisfied. To determine revenue recognition for contracts within the scope of ASC 606, the Company (i) identifies the contract(s) with a customer; (ii) identifies the performance obligations in the contract; (iii) determines the transaction price; (iv) allocates the transaction price to the performance obligations; and (v) recognizes revenue when (or as) the entity satisfies the performance obligation. The Company accounts for a customer contract when both parties have approved the contract and are committed to perform their respective contractual obligations, each party's rights can be identified, payment terms can be identified, the contract has commercial substance and it is probable that the Company will collect the consideration to which it is entitled. When billed in advance, the payment is deferred and recognized upon delivery of the service. Collectability is assessed based on a number of factors including collection history and customer creditworthiness. If collectability of substantially all consideration to which the Company is entitled under the contract is determined to be not probable, revenue is not recorded until collectability becomes probable. Revenue is recorded based on the transaction price excluding amounts collected on behalf of third parties, such as sales taxes collected and remitted to governmental authorities. Trade receivables are recorded at the invoiced amount and do not bear interest. The Company calculates an allowance for doubtful accounts based on a risk assessment performed when trade receivables are recognized. The allowance is calculated in accordance with ASC Topic 326, Current Expected Credit Losses . Write-offs are recorded at the time when trade receivables are deemed uncollectible.
Trade Receivables and Allowance for Doubtful Accounts	Revenue Recognition, Trade Receivables and Allowance for Doubtful Accounts The Company follows the guidance within ASC Topic 606, Revenue from Contracts with Customers to determine how and when it recognizes revenues. The Company recognizes revenue when its performance obligations with its customers have been satisfied. To determine revenue recognition for contracts within the scope of ASC 606, the Company (i) identifies the contract(s) with a customer; (ii) identifies the performance obligations in the contract; (iii) determines the transaction price; (iv) allocates the transaction price to the performance obligations; and (v) recognizes revenue when (or as) the entity satisfies the performance obligation. The Company accounts for a customer contract when both parties have approved the contract and are committed to perform their respective contractual obligations, each party's rights can be identified, payment terms can be identified, the contract has commercial substance and it is probable that the Company will collect the consideration to which it is entitled. When billed in advance, the payment is deferred and recognized upon delivery of the service. Collectability is assessed based on a number of factors including collection history and customer creditworthiness. If collectability of substantially all consideration to which the Company is entitled under the contract is determined to be not probable, revenue is not recorded until collectability becomes probable. Revenue is recorded based on the transaction price excluding amounts collected on behalf of third parties, such as sales taxes collected and remitted to governmental authorities. Trade receivables are recorded at the invoiced amount and do not bear interest. The Company calculates an allowance for doubtful accounts based on a risk assessment performed when trade receivables are recognized. The allowance is calculated in accordance with ASC Topic 326, Current Expected Credit Losses . Write-offs are recorded at the time when trade receivables are deemed uncollectible.
Fair Value	Fair Value Certain assets and liabilities are carried at fair value in accordance with ASC Topic 820, Fair Value Measurement . Fair value is defined as the price that would be received for an asset or paid to transfer a liability (i.e., the exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The guidance establishes a fair value hierarchy that prioritizes the inputs used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are as follows: • Level 1—Unadjusted quoted prices in active markets for identical assets or liabilities; • Level 2—Significant other observable inputs other than Level 1 prices, such as quoted prices for similar, but not identical, assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; or other inputs that are observable or can be corroborated by observable market data; and • Level 3—Significant unobservable inputs in which there is little or no market data available and requires the Company to develop its own assumptions that market participants would use in pricing an asset or liability. Assets and liabilities measured at fair value are classified in their entirety based on the lowest level of any input that is significant to the fair value measurement. The Company's estimates of fair values are based upon assumptions believed to be reasonable, but which are uncertain and involve significant managerial judgments made by considering factors specific to the asset or liability. The determination of fair value requires more judgment to the extent the valuation is based on models or inputs that are less observable or unobservable in the market. Accordingly, the degree of judgment exercised by the Company in determining the fair value is greatest for instruments categorized as Level 3. The Company's recurring fair value measurements comprise the Private Placement Warrants, the Public Warrants, the Earnout Shares (as defined in Note 11) and short-term investments (Note 9).
Cash and Cash Equivalents	Cash and Cash Equivalents As defined within ASC Topic 230, Statement of Cash Flows , cash equivalents represent short-term, highly liquid investments that are both readily convertible to cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, the Company considers highly liquid investments with original maturities of three months or less as cash equivalents. As of December 31, 2023 (Successor), cash equivalents of $202,138 are not covered by the FDIC program. The carrying value of cash and cash equivalents equals its fair value.
Short-Term Investments and Investments in Securities	Short-Term Investments The Company classifies investments with maturities greater than three months but less than one year as short-term investments. As of December 31, 2023 (Successor), the Company's short-term investment balance consisted of a single six-month certificate of deposit custodied by a domestic banking institution. Short-term investments are classified as held-to-maturity according to the guidance contained within ASC Topic 320, Investments — Debt Securities ("ASC 320") because the Company has the intent and ability to hold the certificate of deposit until maturity. Interest income generated from short-term investments is recorded as Interest income (expense) on the Company's consolidated statement of operations and comprehensive loss. Interest accrued on short-term investments is recorded as interest receivable on the consolidated balance sheets. Investments in Securities In accordance with ASC 320, the Company classifies investments in fixed maturity securities at the acquisition date and reevaluates the classification at each balance sheet date. Held-to-maturity investments are carried at amortized cost, reflecting the ability and intent to hold the securities to maturity. Trading investments are securities acquired with the intent to sell in the near term and are carried at fair value with changes in fair value reported in earnings. All other fixed maturity securities are classified as available-for-sale and are carried at fair value with net unrealized gains or losses related to non-credit factors reported as a component of accumulated other comprehensive income. The difference between the original cost and maturity value of a fixed maturity security is amortized to earnings using the interest method. The primary objectives of the Company's investment portfolio are to maintain the safety of invested capital, provide prudent levels of liquidity to accommodate operational and capital needs and maintain an acceptable level of risk. These risks include credit risk, interest rate risk and concentration risk, which are mitigated through the creation of a diversified investment portfolio consisting of liquid and high credit quality financial instruments. As required by ASC Topic 326, Financial Instruments—Credit Losses , the Company reviews its available-for-sale securities portfolio for impairment and determines if impairment is due to credit losses or other reasons. In making the assessment of whether a loss arises from credit or other factors, management considers the extent to which fair value is less than amortized cost, any changes to the rating of the security by a rating agency and adverse conditions related to the security, among other factors. If this assessment indicates that a credit loss exists, the present value of cash flows expected to be collected from the security are compared to the amortized cost basis of the security. If the present value of cash flows is less than the amortized cost basis, a credit loss exists and an allowance is created, limited by the amount that the fair value is less than the amortized cost basis. Subsequent activity related to the credit loss component (e.g. write-offs, recoveries) is recognized as part of the allowance for credit losses on available-for-sale securities.
Warrants	Warrants The Company issued Public Warrants and Private Placement Warrants (as defined in Note 3) prior to the consummation of the Business Combination. The Company accounts for both the Public Warrants and Private Placement Warrants as liability-classified instruments based on an assessment of the Warrants' specific terms and applicable authoritative guidance outlined in ASC Topic 480, Distinguishing Liabilities from Equity ("ASC 480"), ASC Topic 815, Derivatives and Hedging
Tax Receivable Agreement Liability	Tax Receivable Agreement Liability As part of the Business Combinations, the Company entered into the Tax Receivable Agreement ("TRA") with certain OpCo unitholders that will represent approximately 75% of the calculated tax savings based on the portion of basis adjustments on exchanges of OpCo units and other carryforward attributes that are anticipated to be able to be utilized in future years. Such tax attributes include the existing tax basis of certain assets of OpCo and its consolidated subsidiaries; tax basis adjustments resulting from taxable exchanges of Class A OpCo Units; certain tax benefits realized by NET Power Inc. as a result of the Business Combination and tax deduction in respect of portions of certain TRA payments. All such payments made under the terms of the TRA are the obligations of NET Power Inc. and not of OpCo.
Intangible Assets	Intangible Assets The Company accounts for definite-lived intangible assets, in accordance with ASC Topic 350, Goodwill and Other Intangible Assets ("ASC 350"). Intangible assets are comprised entirely of developed technology related tot he NET Power Cycle, which the Company amortizes over a 20-year useful life.
Goodwill	Goodwill The Company recognizes goodwill in accordance with ASC 350. Goodwill represents the excess costs of an acquired entity over the amounts assigned to assets acquired and liabilities assumed in a business combination. The Company's goodwill is not tax deductible. Goodwill is not amortized but is tested annually for impairment. The Company assesses its goodwill
Prepaid Expenses	Prepaid Expenses Prepaid expenses consist of costs paid in advance for software and other subscriptions, patent renewal fees, general liability insurance and employee health insurance.
Property, Plant and Equipment	Property, Plant and Equipment Property, plant and equipment is generally recorded at the historical cost to acquire the assets. The costs bases of property, plant and equipment to which the Company held title prior to the Business Combination (Note 3) were stepped-up to their respective fair values on June 8, 2023 in accordance with the closure of the Business Combination. Depreciation is calculated on the straight-line method over the estimated useful lives of the respective assets. Amounts capitalized to construction in progress are not depreciated until the underlying asset is placed into service. The following table summarizes the estimated useful lives used to depreciate property, plant and equipment and assets: Asset Classification Useful Life Furniture and Equipment 4 – 7 Demonstration Plant 7 Property, plant and equipment is presented at cost less accumulated depreciation on the consolidated balance sheets.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets In accordance with ASC Topic 360, Property, Plant and Equipment
Leases	Leases Lease agreements may fall within two categories according to ASC Topic 842, Leases ("ASC 842"), operating leases or financing leases. Both operating and finance leases result in the recognition of lease liabilities and associated right-of-use assets that are valued at the net present value of the lease payments and recognized. The Company has elected the short-term lease exception and therefore only recognizes right-of-use assets and lease liabilities for leases with a term greater than one year. The lease term includes the committed lease term identified in the contract, taking into account renewal and termination options that management is reasonably certain to exercise. The Company also elected to not separate lease components and non-lease components when allocating contract consideration to leases of commercial office space. The discount rate used in the measurement of a right-of-use asset and lease liability is the rate implicit in the lease whenever that rate is readily determinable. If the rate implicit in the lease is not readily determinable, the Company uses its incremental borrowing rate as a proxy for the discount rate based on the term of the lease.
Asset Retirement Obligation	Asset Retirement Obligation The Company recognizes liabilities for future obligations associated with the retirement of assets. The fair values of legal obligations to retire and remove long-lived assets are recorded in the period in which the obligation is incurred. When an asset retirement obligation arises, the liabilities and corresponding assets are recorded at their present values using a discounted cash flow approach and the liabilities are accreted using the interest method. The asset retirement obligations that have been recorded to-date relate to the Company's obligation to restore the property underneath the Demonstration Plant at the end of the Demonstration Plant's estimated useful life as required by the lease terms. The accretion expense generated by the Company's asset retirement obligation liability is recognized ratably over the Demonstration Plant's expected seven-year useful life.
Net Loss per Unit and Net Loss per Share	Net Loss per Unit During the Predecessor Period, the Company computed basic net loss per unit by dividing the total net loss applicable to membership interest holders by the weighted average number of membership interests outstanding during the period. The Company computed diluted net loss per unit by dividing the net loss applicable to membership interest holders by the sum of the weighted-average number of membership interests outstanding during the period and the potentially dilutive effects of distribution units, profits interests and options to purchase membership interests. Such items were excluded if their effect was anti-dilutive. Since the impact of the distribution units, profits interests, and options to purchase membership interests were anti-dilutive during periods of net loss, there was no difference between the Company's basic and diluted net loss per unit for the period from January 1, 2023 through June 7, 2023 (Predecessor) or the year ended December 31, 2022 (Predecessor). Net Loss per Share During the Successor Period, basic net loss per share is computed based on the weighted average number of shares of Class A Common Stock outstanding. Diluted net loss per share is computed based on the weighted average number of common shares outstanding, increased by the number of any additional shares that would have been outstanding had any potentially dilutive common shares been issued. For the purposes of the diluted earnings per share calculation, Warrants, Earnout Shares (as defined in Note 11), restricted stock units and conversion of OpCo Units are excluded from the calculation for the period from June 8, 2023 through December 31, 2023 (Successor), as the inclusion would be anti-dilutive due to the losses reported in the year. Successor Period Basic net loss per share is computed based on the weighted average number of shares of Class A Common Stock outstanding. Diluted net income per share is computed based on the weighted average number of shares of Class A Common Stock outstanding, increased by the number of any additional shares of Class A Common Stock that would have been outstanding had any potentially dilutive shares of Class A Common Stock been issued and reduced by the number of shares of Class A Common Stock the Company could have repurchased from the proceeds from issuance of the potentially dilutive shares. Predecessor Period Basic net loss per unit is computed based on the weighted average number of membership interests outstanding. Diluted net loss per unit is computed based on the weighted average number of membership interests outstanding, increased by the number of any additional units that would have been outstanding had any potentially dilutive membership interests been issued and decreased by the number of membership interests the Company could have repurchased from the proceeds from issuance of the potentially dilutive membership interests.
Share Based Compensation	Share Based Compensation The Company applies ASC Topic 718, Share-Based Payments ("ASC 718") to account for its equity awards. In accordance with ASC 718, the Company recognizes expense related to equity awards for which vesting is considered probable. Forfeitures are recognized as they occur. For service-based awards, compensation cost is measured at fair value on the grant date and expensed ratably over the vesting term. For performance-based grants, the fair value is measured on the grant date and recognized as non-cash compensation expense, considering the probability of the targets being achieved. Subsequent to the Business Combination, the Company uses the publicly quoted price on the grant date to estimate the fair value of the award. The Company recognizes compensation expense generated by all service-based awards on a straight-line basis over the underlying awards' vesting period. Compensation expense from share-based awards is recorded as General and administrative expense in the consolidated statement of operations and comprehensive loss. Prior to the Business Combination, equity awards granted to employees included unvested membership units in NET Power, LLC. The estimated fair value of NET Power, LLC membership units was determined by an independent, external valuation service provider at each equity grant date until the Closing Date, upon which the Company became publicly traded. On the Closing Date, the Company fair valued the OpCo Units used to satisfy outstanding share-based awards at the fair value of the Company's Class A Common Stock.
Earnout Shares and Restricted Shares	Earnout Shares and Restricted Shares
Non-Controlling Interest	Non-Controlling Interest Non-controlling interests ("NCI") represent ownership positions of OpCo held by sponsors, certain strategic partners and owners of NET Power, LLC prior to the Business Combination. After the conversion of Class B OpCo Units to Class A OpCo Units in the Business Combination, NCI is comprised exclusively of Class A OpCo Units (Note 11). After evaluating Class A OpCo Unit redemption rights under ASC 480, the Company determined that Class A OpCo Units are subject to potential cash redemption that rests outside the Company's control. The Company has classified NCI as a component of mezzanine equity in consideration of this cash redemption feature and in accordance with the guidance in ASC 810. The Company measures redeemable NCI each quarter at the higher of its book value or its redemption value, which equals the closing price of the Company's Class A Common Stock on the measurement date. As of December 31, 2023 (Successor), the book value was higher than the redemption value of non-controlling interests. The change in measurement is shown as the carrying value adjustment of redeemable Non-Controlling Interest in the Company's consolidated statement of shareholders' equity and non-controlling interest.
Research and Development Costs	Research and Development Costs The Company expenses costs related to operations and testing at the Demonstration Plant, as well as engineering and design costs related to development of the NET Power Cycle as incurred. These costs are included in Research and development expense on the consolidated statement of operations and comprehensive loss.
Related Parties	Related Parties The Company applies ASC Topic 850, Related Parties and prevailing SEC guidance to classify and report transactions with related parties. The Company has entered into contractual relationships with several of its current shareholders and former members that qualify as related parties according to the aforementioned criteria. These relationships include loans from members and master service agreements ("MSA's"). Reference Note 8 for additional information.
Income Taxes	Income Taxes The Company applies the guidance set forth in ASC Topic 740, Income Taxes ("ASC 740") to evaluate its tax positions. The Company evaluates the realizability of deferred tax assets on a quarterly basis and establishes a valuation allowance when it is more-likely-than-not that all or a portion of a deferred tax asset may not be realized. In making such a determination, the Company considers all positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax planning strategies and recent results of operations. NET Power Inc. consolidates the financial results of OpCo in its consolidated financial statements. OpCo represents a pass-through entity for U.S. federal and most applicable state and local income tax purposes. As a pass-through entity for tax purposes, OpCo is not subject to U.S. federal and certain state and local income taxes. Any taxable income or loss generated by OpCo is passed through to its members, including NET Power Inc., which is taxed as a corporation that pays corporate federal, state and local taxes with respect to income allocated from OpCo based on its economic interest in OpCo. During the Predecessor Period, NET Power, LLC's results of operations do not include any material provisions for U.S. federal income tax because NET Power, LLC represents a pass-through entity for federal income tax purposes.
Recently Adopted Accounting Standards and Accounting Standards Not Yet Adopted	Recently Adopted Accounting Standards During November, 2023, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2023-07, Segment Reporting (Topic 280) — Improvements to Reportable Segment Disclosures ("ASU 2023-07"). ASU 2023-07 requires that public entities include the following segment disclosures in its interim and annual financial statements: significant segment expenses that are regularly provided to the chief operating decision maker ("CODM") and included within each reported measure of segment profit or loss; an amount for other segment items, which comprise segment revenue less segment expenses and measures of segment profit or loss by reportable segment, and a description of their compositions; additional measures of segment profit, subject to qualifications, if the CODM uses more than one measure of a segment's profit or loss in assessing segment performance and deciding how to allocate resources; and the title and position of the CODM and an explanation of how the CODM uses the reported measure(s) of segment profit or loss in assessing segment performance and deciding how to allocate resources. ASU 2023-07 requires public entities that have a single reportable segment to provide all of these disclosures and all existing segment disclosures in ASC 280. ASU 2023-07 is effective for all annual reporting periods beginning after December 15, 2023 and for all interim reporting periods beginning after December 15, 2024. Early adoption is permitted. The Company incorporated ASU 2023-07's relevant disclosure requirements by identifying the CODM and clarifying that the Company's single reportable segment comprises all of the consolidated financial statements in Note 2. The disclosure requirements related to significant segment expenses, other segment items and measures of segment profit did not affect the Company's consolidated financial statements. Accounting Standards Not Yet Adopted During October, 2023, the FASB issued ASU 2023-06, Disclosure Improvements: Codification Amendments in Response to the SEC ' s Disclosure Update and Simplification Initiative ("ASU 2023-06"). ASU 2023-06 incorporates 14 of the 27 disclosure requirements published in Securities and Exchange Commission ("SEC") Release No. 33-10532, Disclosure Update and Simplification into various topics within the Accounting Standards Codification . ASU 2023-06’s amendments represent clarifications to, or technical corrections of, current requirements. For SEC registrants, the effective date for each amendment will be the date on which the SEC removes that related disclosure from its rules. Early adoption is prohibited. The Company does not expect ASU 2023-06 will have a material effect on its consolidated financial statements. During December, 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740) — Improvements to Income Tax Disclosures ("ASU 2023-09"). ASU 2023-09 requires public business entities to provide annually a tabular reconciliation of the reported income tax expense (or benefit) from continuing operations to the product of the income (or loss) from continuing operations before income taxes and the applicable statutory federal income tax rate using specified categories and to disclose separately reconciling items within certain categories with absolute values equal to or greater than five percent of the product of the income (or loss) from continuing operations before tax and the applicable statutory tax rate. Additionally, ASU 2023-09 requires a public business entity to disclose the year-to-date amount of income taxes paid, net of refunds received, to federal, state and foreign jurisdictions. If a payment to a single federal, state or foreign jurisdiction equals or exceeds five percent of total income taxes paid, ASU 2023-09 requires separate disclosure of that payment. Finally, ASU 2023-09 requires a public business entity to disclose income (or loss) from continuing operations before income tax expense (or benefit) disaggregated between domestic and foreign jurisdictions and to disclose income tax expense (or benefit) from continuing operations disaggregated between federal, state and foreign jurisdictions. ASU 2023-09 removes the requirement to disclose the nature and estimate of the range of reasonably possible increases or decreases in the unrecognized tax benefits balance in the next 12 months, or to make a statement that an estimate of the range cannot be made. ASU 2023-09 is effective for public business entity calendar years beginning after December 15, 2024. Early adoption is permitted. The Company is evaluating the effect ASU 2023-09 will have on its consolidated financial statements.

Basis of Presentation and Sig_3

Basis of Presentation and Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Property, Plant and Equipment	The following table summarizes the estimated useful lives used to depreciate property, plant and equipment and assets: Asset Classification Useful Life Furniture and Equipment 4 – 7 Demonstration Plant 7 The following table summarizes the key classifications of property, plant and equipment as of December 31, 2023 (Successor) and December 31, 2022 (Predecessor): December 31, 2023 (Successor) December 31, 2022 (Predecessor) Furniture and equipment, gross $ 320 $ 368 Demonstration Plant, gross 89,241 128,013 Construction in progress 14,441 — Total property, plant and equipment, gross 104,002 128,381 Accumulated depreciation (7,146) (58,786) Total property, plant and equipment, net $ 96,856 $ 69,595

Business Combination (Tables)

Business Combination (Tables)	12 Months Ended
	Dec. 31, 2023
Business Combination and Asset Acquisition [Abstract]
Schedule of Business Acquisitions, by Acquisition	The following table summarizes the total consideration transferred in the Business Combination: Consideration Transferred Total Pre-combination vesting of modified profits interests $ 325 Pre-combination vesting of unmodified profits interests 651 Consideration transferred to sellers 976 Class A OpCo Units - non-controlling interests 1,785,283 Fair value of total consideration transferred $ 1,786,259
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The following table sets forth the fair value of the assets and liabilities assumed in connection with the Business Combination: Total Assets acquired Current assets Cash $ 7,946 Prepaid expenses 637 Other current assets 30 Total current assets 8,613 Long-term assets Intangible assets, net 1,345,000 Property, plant and equipment 91,855 Right-of-use assets 940 Total long-term assets 1,437,795 Total assets acquired $ 1,446,408 Liabilities assumed Current liabilities Accounts payable $ 2,574 Accrued liabilities 7,370 Current lease liability 137 Other current liabilities 1 Total current liabilities 10,082 Long-term liabilities Deferred tax liability 71,426 Asset retirement obligation 1,967 Long-term lease liability 594 Total long-term liabilities 73,987 Total liabilities assumed 84,069 Total identifiable net assets 1,362,339 Goodwill 423,920 Net assets acquired $ 1,786,259
Business Acquisition, Pro Forma Information	The following table presents unaudited pro forma information as if the Business Combination occurred as of January 1, 2022 (Predecessor). The unaudited pro forma information reflects adjustments for additional amortization resulting from the fair value re-measurement of assets acquired and liabilities assumed, for alignment of accounting policies, and transaction expenses as if the Business Combination occurred on January 1, 2022 (Predecessor). The unaudited pro forma results do not include any anticipated cost synergies or other effects of the combined company. Accordingly, pro forma amounts are not necessarily indicative of the results that actually would have occurred had the Business Combination been completed on the date indicated, nor are they indicative of the Company's future operating results. Year Ended December 31, 2023 2022 Pro forma revenue $ 175 $ 580 Pro forma net loss $ (205,387) $ (121,652) Pro forma net loss attributable to non-redeemable controlling interest $ (67,778) $ (40,145) Pro forma net loss attributable to non-redeemable non-controlling interests $ (137,609) $ (81,507)

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The following table presents the Company's goodwill balance as of December 31, 2023 (Successor): Goodwill at June 8, 2023 (Successor) $ 433,736 Measurement Adjustments (9,816) Goodwill at December 31, 2023 (Successor) $ 423,920
Schedule of Finite-Lived Intangible Assets	Definite Lived Intangible Assets The following tables present the Company's definite lived intangible assets as of December 31, 2023 (Successor) and December 31, 2022 (Predecessor) are as follows: December 31, 2023 (Successor) December 31, 2022 (Predecessor) Developed technology, gross $ 1,345,000 $ 604 Accumulated amortization (37,735) (341) Developed technology, net $ 1,307,265 $ 263
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	The following table presents estimated amortization expense for the next five years and thereafter: 2024 $ 67,250 2025 67,250 2026 67,250 2027 67,250 2028 67,250 2029 and thereafter 971,015 Total $ 1,307,265

Property, Plant, and Equipment

Property, Plant, and Equipment (Tables)	12 Months Ended
	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	The following table summarizes the estimated useful lives used to depreciate property, plant and equipment and assets: Asset Classification Useful Life Furniture and Equipment 4 – 7 Demonstration Plant 7 The following table summarizes the key classifications of property, plant and equipment as of December 31, 2023 (Successor) and December 31, 2022 (Predecessor): December 31, 2023 (Successor) December 31, 2022 (Predecessor) Furniture and equipment, gross $ 320 $ 368 Demonstration Plant, gross 89,241 128,013 Construction in progress 14,441 — Total property, plant and equipment, gross 104,002 128,381 Accumulated depreciation (7,146) (58,786) Total property, plant and equipment, net $ 96,856 $ 69,595

Accrued Liabilities (Tables)

Accrued Liabilities (Tables)	12 Months Ended
	Dec. 31, 2023
Payables and Accruals [Abstract]
Schedule of Accrued Liabilities	Accrued liabilities as of December 31, 2023 (Successor) and December 31, 2022 (Predecessor) are as follows: December 31, 2023 (Successor) December 31, 2022 (Predecessor) Accrued incentive compensation $ 2,016 $ 1,451 Accrued cash-based expense of BHES JDA 3,669 — Accrued legal service provider fees 160 713 Accrued capital expenditures 3,605 — Other accrued liabilities 1,465 228 Total accrued liabilities $ 10,915 $ 2,392

Revenue and Accounts Receivab_2

Revenue and Accounts Receivable (Tables)	12 Months Ended
	Dec. 31, 2023
Receivables [Abstract]
Disaggregation of Revenue	The following table disaggregates the Company's revenue streams into its major sub-components: June 8 – December 31, 2023 (Successor) January 1 – June 7, 2023 (Predecessor) January 1 - December 31, 2022 (Predecessor) Feasibility studies $ — $ 175 $ 125 Test data sales — — 150 Testing services — — 305 Total revenue $ — $ 175 $ 580
Schedule of Accounts, Notes, Loans and Financing Receivable	Accounts receivable, net as of December 31, 2023 (Successor) and December 31, 2022 (Predecessor) includes the following balances: December 31, 2023 (Successor) December 31, 2022 (Predecessor) Accounts receivable, gross $ 58 352 Allowance for doubtful accounts — — Accounts receivable, net $ 58 $ 352

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2023
Related Party Transactions [Abstract]
Schedule of Related Party Transactions	The following table summarizes the related party amounts on the consolidated balance sheets: December 31, 2023 (Successor) December 31, 2022 (Predecessor) Amounts due to related parties under MSA $ 142 $ 178 Due to related parties - current $ 142 $ 178 Amounts due to related parties under BHES JDA $ — $ 2,212 Due to related parties - long-term $ — $ 2,212 The following table summarizes the related party amounts on the consolidated statement of operations and comprehensive loss for the periods presented: June 8 – December 31, 2023 (Successor) January 1 - June 7, 2023 (Predecessor) Year Ended December 31, 2022 (Predecessor) MSA costs related to testing services $ — $ — $ 86 Cost of revenue – related party $ — $ — $ 86 MSA administrative costs $ 84 $ 79 $ 247 Engineering support provided by former board member — 97 230 Engineering services provided by former investor — — 27 General and administrative – related party $ 84 $ 177 $ 504 MSA costs for Demonstration Plant $ 643 $ 530 $ 984 BHES JDA — 11,713 14,833 Research and development – related party $ 643 $ 12,243 $ 15,817 Option settlement – related party $ 79,054 $ — $ —

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	12 Months Ended
	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Fair Value, Liabilities Measured on Recurring Basis	The following table presents information about the Company's liabilities that are measured at fair value on a recurring basis as of December 31, 2023 (Successor) and indicates the fair value hierarchy of the valuation inputs the Company utilized to determine each asset's and each liability's fair value: Assets Level 1 Level 2 Level 3 Total Short-term Investments $ — $ 100,000 $ — $ 100,000 Total $ — $ 100,000 $ — $ 100,000 Liabilities Level 1 Level 2 Level 3 Total Public Warrants $ 18,969 $ — $ — $ 18,969 Private Placement Warrants — — 36,951 36,951 Earnout Shares — — 1,671 1,671 Total $ 18,969 $ — $ 38,622 $ 57,591 The following table presents information about the Company's liabilities that were measured at fair value on a recurring basis as of December 31, 2022 (Predecessor) and indicates the fair value hierarchy of the valuation inputs the Company utilized to determine the liability’s fair value: Liabilities Level 1 Level 2 Level 3 Total Option Liability $ — $ — $ 5,174 $ 5,174 Total $ — $ — $ 5,174 $ 5,174
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation	The following table presents a reconciliation of the beginning and ending balances of recurring level 3 fair value measurements: June 8 – December 31, 2023 (Successor) January 1 – June 7, 2023 (Predecessor) January 1 - December 31, 2022 (Predecessor) Balance of recurring level 3 liabilities at beginning of period $ 63,851 $ 5,174 $ 1,459 Change in Earnout Shares liability and Warrant liability (16,174) — — Change in Option liability — — 3,715 Issuances (9,055) — — Payments — (5,174) — Balance of recurring level 3 liabilities at end of period $ 38,622 $ — $ 5,174

Net Loss per Share_Unit (Tables

Net Loss per Share/Unit (Tables)	12 Months Ended
	Dec. 31, 2023
Earnings Per Share [Abstract]
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	Based on the amounts outstanding at December 31, 2023 (Successor), the Company excluded the following financial instruments from the computation of diluted net loss per unit because their inclusion would be anti-dilutive due to the losses reported in the Successor Period: Anti-Dilutive Instrument December 31, 2023 (Successor) Public Warrants 8,622,235 Private Placement Warrants 10,900,000 Earnout Shares 328,925 BHES Bonus Shares 2,068,416 Unvested Class A OpCo Units 848,415 Vested Class A OpCo Units 141,304,030 Unvested RSU's 443,221 Total 164,515,242 the following positions from the computation of diluted net loss per unit because their inclusion would be anti-dilutive due to the losses reported in the Predecessor Period: Anti-Dilutive Instrument December 31, 2022 (Predecessor) June 7, 2023 (Predecessor) Unvested profits interests 226,494 119,076 Member loan share options 34,588 — Occidental Petroleum share options 711,111 — Total 972,193 119,076
Schedule of Earnings Per Share, Basic and Diluted	The following table sets forth the computation of the Company's basic and diluted net loss per share for the period from June 8, 2023 through December 31, 2023 (Successor): Class A Common Stock Numerator Net loss $ (141,816) Net loss attributable to shareholders $ (43,056) Denominator Weighted-average number shares outstanding, basic and diluted 69,756 Net loss per share attributable to shareholders, basic and diluted $ (0.62) The following table sets forth the computation of the Company's basic and diluted net loss per unit for the period from January 1, 2023 through June 7, 2023 (Predecessor), and for the year ended December 31, 2022 (Predecessor), respectively: Period from January 1 - June 7, 2023 (Predecessor) Year Ended December 31, 2022 (Predecessor) Numerator Net loss $ (34,176) $ (54,778) Net loss attributable to membership interest holders $ (34,176) $ (54,778) Denominator Weighted-average number membership interests outstanding, basic and diluted 3,767 3,703 Net loss per unit attributable to membership interest holders, basic and diluted $ (9.07) $ (14.79)

Shareholders' Equity and Non-_2

Shareholders' Equity and Non-Controlling Interest (Tables)	12 Months Ended
	Dec. 31, 2023
Equity [Abstract]
Schedule Of Comprehensive Loss Attributable To Non-Redeemable And Redeemable Non-Controlling Interest	The table below demonstrates the calculation of net loss before income tax attributable to redeemable non-controlling interest holders for the June 8, 2023 through December 31, 2023 (Successor) period and the June 8, 2023 through December 31, 2023 (Successor) period: Period from June 8 - December 31, 2023 (Successor) Net Loss before income tax $ (147,523) Redeemable non-controlling interest percentage - Class A OpCo Units 67.0 % Net Loss before income tax attributable to Class A OpCo Units $ (98,760)

Share-Based Payments (Tables)

Share-Based Payments (Tables)	12 Months Ended
	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Share-Based Payment Arrangement, Option, Activity	The following table presents a summary of employee equity awards comprised of Class A OpCo Units and the corresponding quantity of shares of Class B Common Stock outstanding, granted, forfeited, vested on an accelerated basis and redeemed during the current year-to-date: Quantity Calculated Value Period from June 8 - December 31, 2023 (Successor) Period from January 1 - June 7, 2023 (Predecessor) Period from June 8 - December 31, 2023 (Successor) Period from January 1 - June 7, 2023 (Predecessor) Unvested, beginning of period 1,895,122 226,494 $ 4.95 $ 63.25 Granted — — $ — $ — Forfeited (324,568) — $ 5.66 $ — Vested (30,069) (107,418) $ 4.32 $ 63.18 Accelerated (692,070) — $ 4.32 $ — Unvested, end of period 848,415 119,076 $ 4.62 $ 63.32
Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity	The following table presents a summary of RSU's outstanding, granted, forfeited, vested and accelerated during the period from; June 8, 2023 through December 31, 2023 (Successor): Quantity Fair Value Unvested, beginning of period — $ — Granted 443,221 $ 13.43 Forfeited — $ — Vested — $ — Accelerated — $ — Unvested, end of period 443,221 $ 13.43
Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award	The following table presents the quantity and value of equity issued to Baker Hughes Energy Services LLC ("BHES") as payment for costs incurred pursuant to the Original JDA and the Amended and Restated JDA (Note 14). The portion of BHES JDA costs that the Company pays with Class A OpCo Units and shares of Class B Common Stock is recorded within additional paid in capital on the consolidated balance sheets and the consolidated statement of shareholders' equity and non-controlling interest. The table below displays the fair value of shares distributed as payment for services rendered by BHES under the terms of the BHES JDA. Quantity Total Fair Value Period from June 8 - December 31, 2023 (Successor) Period from January 1 - June 7, 2023 (Predecessor) Period from June 8 - December 31, 2023 (Successor) Period from January 1 - June 7, 2023 (Predecessor) Equivalent Value per Unit or per Share (1) Membership Interests — 9,210 $ — $ 1,943 $ 168.75 Class A OpCo Units 1,236,265 296,160 8,172 1,958 $ 5.29 Class B Common Stock 1,236,265 296,160 — — $ — Total $ 8,172 $ 3,901 ___________ (1) The Equivalent Value per Unit is the discounted price per membership interest or per share stipulated in the BHES JDA. Performance Period End Date Compensation Cost Incurred To Date Remaining Compensation Cost Total Compensation Cost BHES JDA - variable share-based payments January, 2027 $ 21,167 $ 6,178 $ 27,345

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2023
Leases [Abstract]
Lessee, Operating Lease, Liability, to be Paid, Maturity	The following table presents the future minimum lease payments that the Company expects to make under its operating leases: Year Future Minimum Lease Payments 2024 $ 504 2025 517 2026 531 2027 545 2028 512 2029 and thereafter — Total $ 2,608

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Schedule of Change in Asset Retirement Obligation	The following table reconciles the beginning and ending balances of the asset retirement obligation for each period presented: Period from June 8 – December 31, 2023 (Successor) Period from January 1 – June 7, 2023 (Predecessor) Year Ended December 31, 2022 (Predecessor) Asset retirement obligation, beginning of period $ 1,967 $ 2,416 $ — Obligation incurred — — 2,201 Periodic accretion expense 93 102 215 Asset retirement obligation, end of period $ 2,060 $ 2,518 $ 2,416
Long-Term Purchase Commitment	The following table presents the Company's material, unrecognized purchase obligations: Commitment Consideration Type Gross Commitment Period from June 8 - December 31, 2023 (Successor) Period from January 1 - June 7, 2023 (Predecessor) Prior Predecessor Periods Remaining Commitment Asset purchase commitments Cash $ 26,009 $ 4,023 $ 1,168 $ — $ 20,818 BHES JDA Cash 70,000 6,536 3,121 2,211 58,132 BHES JDA Share-Based 70,000 6,536 3,121 2,211 58,132 Total $ 166,009 $ 17,095 $ 7,410 $ 4,422 $ 137,082
Equity Method Investments	The following table presents the costs associated with the BHES JDA during the periods presented : Period from June 8 – December 31, 2023 (Successor) January 1 – June 7, 2023 (Predecessor) January 1 – December 31, 2022 (Predecessor) Cash expense $ 6,536 $ 3,121 $ 2,211 Membership interests issued — 3,902 2,765 Class A OpCo Units issued 8,172 — — BHES Bonus Share expense 6,620 4,690 9,857 Total research and development attributable to BHES JDA $ 21,328 $ 11,713 $ 14,833

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit)	The following table presents the components of the Company's current and deferred income taxes: June 8 - December 31, 2023 (Successor) Federal Current tax expense (benefit) $ — Deferred tax expense (benefit) (5,542) Total federal (5,542) State and local Current tax expense (benefit) — Deferred tax expense (benefit) (165) Total state and local (165) Total $ (5,707)
Schedule of Effective Income Tax Rate Reconciliation	The following table presents the Company's effective income tax rate during the period from June 8, 2023 through December 31, 2023 (Successor): June 8 - December 31, 2023 (Successor) U.S. federal statutory rate 21.0 % Increase (decrease) due to: State income taxes, net of federal income tax benefit 0.1 % Non-controlling interests (14.1) % Equity transactions (3.8) % Other permanent adjustments (0.5) % Change in investment in OpCo (2.5) % Valuation allowance 3.7 % Effective tax rate 3.9 %
Schedule of Deferred Tax Assets and Liabilities	The following table presents the effects of temporary differences arising from deferred income taxes as of December 31, 2023 (Successor): December 31, 2023 (Successor) Deferred tax assets Federal net operating losses $ 1,976 State net operating losses 186 Investment in OpCo 62,972 Deferred tax assets, gross 65,134 Valuation allowance (62,972) Deferred tax assets, net 2,162 Deferred tax liabilities Property, plant and equipment and (59,881) Deferred tax liabilities, gross (59,881) Deferred tax liabilities, net $ (57,719)

Basis of Presentation and Sig_4

Basis of Presentation and Significant Accounting Policies - Narrative (Details)	5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 07, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 USD ($) segment line_of_business	Dec. 31, 2022 USD ($)
Class of Stock [Line Items]
Number of operating segments | segment			1
Number of reportable segments | segment			1
Number of line of businesses | line_of_business			1
Financial Designation, Predecessor and Successor [Fixed List]			Successor
Cash deposits, amounts in excess of FDIC limit		$ 334,289,000	$ 334,289,000	$ 4,644,000
Cash, uninsured amount		$ 202,138,000	$ 202,138,000
Maturity of time deposits		6 months	6 months
Tax receivable agreement, net cash savings, percentage		0.75	0.75
Goodwill, impairment loss			$ 0
Impairment of intangible assets, finite-lived	$ 0	$ 0		$ 0
Technology-Based Intangible Assets
Class of Stock [Line Items]
Finite-lived intangible asset, useful life		20 years	20 years
Demonstration Plant
Class of Stock [Line Items]
Useful Life		7 years	7 years

Basis of Presentation and Sig_5

Basis of Presentation and Significant Accounting Policies - Schedule of Property, Plant, and Equipment Useful Life (Details)	Dec. 31, 2023
Furniture and Equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful Life	4 years
Furniture and Equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful Life	7 years
Demonstration Plant
Property, Plant and Equipment [Line Items]
Useful Life	7 years

Business Combination - Narrativ

Business Combination - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	Jun. 07, 2023	Jun. 18, 2021	Dec. 31, 2023
Asset Acquisition [Line Items]
Business acquisition, measurement period			1 year
OpCo
Asset Acquisition [Line Items]
Business acquisition, transaction costs	$ 121,883
Business combination, acquisition related costs	16,021
Pre-combination vesting of modified profits interests	325
Pre-combination vesting of unmodified profits interests	651
Deferred tax liability	71,426
Proceeds from trust, net	661,623
Business combination, consideration transferred	$ 1,786,259
Public Warrants | OpCo
Asset Acquisition [Line Items]
Class of warrant or right, outstanding (in shares)	8,624,974
Class of warrant or right, number of securities called by warrants or rights (in shares)	8,624,974
Class of warrant or right, exercise price of warrants or rights (in usd per share)	$ 11.50
Class of warrant or right, redemption price per warrant (in usd per share)	$ 0.01
Class of warrants or right, convertible, threshold trading days	20 days
Class of warrants or right, convertible, threshold consecutive trading days	30 days
Warrants and rights outstanding, term	5 years
Private Placement Warrants | OpCo
Asset Acquisition [Line Items]
Class of warrant or right, outstanding (in shares)	10,900,000
Class of warrant or right, number of securities called by warrants or rights (in shares)	10,900,000
Class of warrant or right, exercise price of warrants or rights (in usd per share)	$ 11.50
Warrants and rights outstanding, term	5 years
Class A Common Stock | OpCo
Asset Acquisition [Line Items]
Common unit, outstanding, vested (in shares)	136,073,365
Common unit, outstanding, unvested (in shares)	1,119,198
Class B ordinary shares | OpCo
Asset Acquisition [Line Items]
Common unit, outstanding, vested (in shares)	136,073,365
Common unit, outstanding, unvested (in shares)	1,119,198
Share Price Equals Or Exceeds Eighteen U.S. Dollars | Class A Common Stock | Public Warrants | OpCo
Asset Acquisition [Line Items]
Share price (in usd per share)	$ 18
Share Price Equals Or Exceeds Ten U.S. Dollars | Class A Common Stock | Public Warrants | OpCo
Asset Acquisition [Line Items]
Share price (in usd per share)	10
Share Price Is Below Eighteen U.S. Dollars | Class A Common Stock | Public Warrants | OpCo
Asset Acquisition [Line Items]
Share price (in usd per share)	$ 18
IPO | RONI
Asset Acquisition [Line Items]
Proceeds from issuance initial public offering		$ 345,000
IPO | Class A Common Stock | OpCo
Asset Acquisition [Line Items]
Share issuances (in shares)	67,352,271

Business Combination - Schedule

Business Combination - Schedule of Consideration Transferred (Details) - OpCo $ in Thousands	Jun. 07, 2023 USD ($)
Asset Acquisition [Line Items]
Pre-combination vesting of modified profits interests	$ 325
Pre-combination vesting of unmodified profits interests	651
Consideration transferred to sellers	976
Class A OpCo Units - non-controlling interests	1,785,283
Fair value of total consideration transferred	$ 1,786,259

Business Combination - Schedu_2

Business Combination - Schedule of Assets and Liabilities Assumed (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Jun. 07, 2023	Dec. 31, 2022
Long-term liabilities
Goodwill	$ 423,920	$ 433,736	$ 0
OpCo
Current assets
Cash		7,946
Prepaid expenses		637
Other current assets		30
Total current assets		8,613
Long-term assets
Intangible assets, net		1,345,000
Property, plant and equipment		91,855
Right-of-use assets		940
Total long-term assets		1,437,795
Total assets acquired		1,446,408
Current liabilities
Accounts payable		2,574
Accrued liabilities		7,370
Current lease liability		137
Other current liabilities		1
Total current liabilities		10,082
Long-term liabilities
Deferred tax liability		71,426
Asset retirement obligation		1,967
Long-term lease liability		594
Total long-term liabilities		73,987
Total liabilities assumed		84,069
Total identifiable net assets		1,362,339
Goodwill		423,920
Net assets acquired		$ 1,786,259

Business Combination - Schedu_3

Business Combination - Schedule of Pro Forma Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Business Combination and Asset Acquisition [Abstract]
Pro forma revenue	$ 175	$ 580
Pro forma net loss	(205,387)	(121,652)
Pro forma net loss attributable to non-redeemable controlling interest	(67,778)	(40,145)
Pro forma net loss attributable to non-redeemable non-controlling interests	$ (137,609)	$ (81,507)

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Schedule of Goodwill (Details) $ in Thousands	7 Months Ended
	Dec. 31, 2023 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 433,736
Measurement Adjustments	(9,816)
Goodwill, ending balance	$ 423,920

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Total	$ 1,307,265
Developed Technology
Finite-Lived Intangible Assets [Line Items]
Developed technology, gross	1,345,000	$ 604
Accumulated amortization	(37,735)	(341)
Total	$ 1,307,265	$ 263

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 07, 2023	Dec. 31, 2023	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, purchase accounting adjustments		$ 9,816
Amortization of intangible assets	$ 9	$ 37,735	$ 22

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets - Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2024	$ 67,250
2025	67,250
2026	67,250
2027	67,250
2028	67,250
2029 and thereafter	971,015
Total	$ 1,307,265

Property, Plant, and Equipmen_2

Property, Plant, and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 104,002	$ 128,381
Accumulated depreciation	(7,146)	(58,786)
Total property, plant and equipment, net	96,856	69,595
Furniture and Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	320	368
Demonstration Plant
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	89,241	128,013
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 14,441	$ 0

Property, Plant, and Equipmen_3

Property, Plant, and Equipment - Additional Information (Details) - USD ($) $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 07, 2023	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Depreciation	$ 5,700	$ 7,146	$ 13,149

Accrued Liabilities (Details)

Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Payables and Accruals [Abstract]
Accrued incentive compensation	$ 2,016	$ 1,451
Accrued cash-based expense of BHES JDA	3,669	0
Accrued legal service provider fees	160	713
Accrued capital expenditures	3,605	0
Other accrued liabilities	1,465	228
Total accrued liabilities	$ 10,915	$ 2,392

Revenue and Accounts Receivab_3

Revenue and Accounts Receivable - Schedule of Revenue Streams (Details) - USD ($) $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 07, 2023	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 175	$ 0	$ 580
Feasibility studies
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	175	0	125
Test data sales
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	0	0	150
Testing services
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 0	$ 0	$ 305

Revenue and Accounts Receivab_4

Revenue and Accounts Receivable - Schedule of Accounts Receivable (Details) - USD ($)	5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 07, 2023	Dec. 31, 2023	Dec. 31, 2022
Receivables [Abstract]
Accounts receivable, gross		$ 58,000	$ 352,000
Allowance for doubtful accounts		0	0
Accounts receivable, net		58,000	352,000
Allowance for doubtful accounts	$ 352,000	$ 0	$ 0

Revenue and Accounts Receivab_5

Revenue and Accounts Receivable - Narrative (Details) - USD ($)	5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 07, 2023	Dec. 31, 2023	Dec. 31, 2022
Receivables [Abstract]
Bad debt expense	$ 352,000	$ 0	$ 0

Related Party Transactions - Sc

Related Party Transactions - Schedule of Related Party Balance Sheet Transactions (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Related Party Transaction [Line Items]
Due to related parties - current	$ 142	$ 178
Due to related parties - long-term	0	2,212
Related Party
Related Party Transaction [Line Items]
Due to related parties - current	142	178
Due to related parties - long-term	$ 0	$ 2,212

Related Party Transactions - St

Related Party Transactions - Statement Of Operations Related Party Transactions (Details) - USD ($) $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 07, 2023	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Option settlement – related party	$ 0	$ 79,054		$ 0
BHES
Related Party Transaction [Line Items]
Research and development	11,713	21,328		14,833
Related Party
Related Party Transaction [Line Items]
Cost of revenue	0	0		86
General and administrative	177	84		504
Research and development	12,243	643		15,817
Option settlement – related party			$ 79,054	0	$ 0
Related Party | BHES
Related Party Transaction [Line Items]
Research and development	11,713	0		14,833
Related Party | Testing services
Related Party Transaction [Line Items]
Cost of revenue	0	0		86
Related Party | MSA administrative costs
Related Party Transaction [Line Items]
General and administrative	79	84		247
Related Party | Engineering support provided by former board member
Related Party Transaction [Line Items]
General and administrative	97	0		230
Related Party | Engineering services provided by former investor
Related Party Transaction [Line Items]
General and administrative	0	0		27
Related Party | MSA costs for Demonstration Plant
Related Party Transaction [Line Items]
Research and development	$ 530	$ 643		$ 984

Related Party Transactions - Na

Related Party Transactions - Narrative (Details) - USD ($) $ in Thousands		5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 07, 2023	Jun. 07, 2023	Dec. 31, 2023	Dec. 31, 2022	Jun. 08, 2023
Related Party Transaction [Line Items]
Due to related parties			$ 142	$ 178
Due to related parties			0	2,212
Related Party
Related Party Transaction [Line Items]
Due to related parties			142	178
General and administrative		$ 177	84	504
Due to related parties			0	2,212
Related Party | MSA administrative costs
Related Party Transaction [Line Items]
Related party, amounts of transaction		79	84	247
General and administrative		79	84	247
Related Party | MSA costs for Demonstration Plant
Related Party Transaction [Line Items]
Related party, amounts of transaction		530	643	984
Related Party | Engineering support provided by former board member
Related Party Transaction [Line Items]
General and administrative		$ 97	$ 0	$ 230
Related Party | Occidental Petroleum
Related Party Transaction [Line Items]
Class of warrant or right, outstanding (in shares)	247,655	247,655			711,111
Warrant liability	$ 79,054	$ 79,054
Stock issued during period, shares, conversion of units (in shares)	7,905,279

Fair Value Measurement - Schedu

Fair Value Measurement - Schedule of Fair Value of Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Assets
Short-term investments	$ 100,000	$ 0
Liabilities
Warrant liability	55,920	0
Earnout Shares liability	1,671	0
Option liability	0	5,174
Fair Value, Recurring
Assets
Short-term investments	100,000
Total	100,000
Liabilities
Earnout Shares liability	1,671
Total	57,591	5,174
Fair Value, Recurring | Public Warrants
Liabilities
Warrant liability	18,969
Fair Value, Recurring | Private Placement Warrants
Liabilities
Warrant liability	36,951
Option Liability | Fair Value, Recurring
Liabilities
Option liability		5,174
Level 1 | Fair Value, Recurring
Assets
Short-term investments	0
Total	0
Liabilities
Earnout Shares liability	0
Total	18,969	0
Level 1 | Fair Value, Recurring | Public Warrants
Liabilities
Warrant liability	18,969
Level 1 | Fair Value, Recurring | Private Placement Warrants
Liabilities
Warrant liability	0
Level 1 | Option Liability | Fair Value, Recurring
Liabilities
Option liability		0
Level 2 | Fair Value, Recurring
Assets
Short-term investments	100,000
Total	100,000
Liabilities
Earnout Shares liability	0
Total	0	0
Level 2 | Fair Value, Recurring | Public Warrants
Liabilities
Warrant liability	0
Level 2 | Fair Value, Recurring | Private Placement Warrants
Liabilities
Warrant liability	0
Level 2 | Option Liability | Fair Value, Recurring
Liabilities
Option liability		0
Level 3 | Fair Value, Recurring
Assets
Short-term investments	0
Total	0
Liabilities
Earnout Shares liability	1,671
Total	38,622	5,174
Level 3 | Fair Value, Recurring | Public Warrants
Liabilities
Warrant liability	0
Level 3 | Fair Value, Recurring | Private Placement Warrants
Liabilities
Warrant liability	$ 36,951
Level 3 | Option Liability | Fair Value, Recurring
Liabilities
Option liability		$ 5,174

Fair Value Measurement - Reconc

Fair Value Measurement - Reconciliation of Level 3 Fair Value of Liabilities (Details) - USD ($) $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 07, 2023	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance of recurring level 3 liabilities at beginning of period	$ 5,174	$ 63,851	$ 1,459
Issuances	0	(9,055)	0
Payments	(5,174)	0	0
Balance of recurring level 3 liabilities at end of period	63,851	38,622	5,174
Other Expense
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Change in Earnout Shares liability and Warrant liability	$ 0	$ (16,174)	$ 0
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Change in Earnout Shares liability and Warrant liability	Change in Earnout Shares liability and Warrant liability	Change in Earnout Shares liability and Warrant liability
Interest Expense
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Change in Earnout Shares liability and Warrant liability	$ 0	$ 0	$ 3,715
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Interest income (expense)	Interest income (expense)	Interest income (expense)

Fair Value Measurement - Narrat

Fair Value Measurement - Narrative (Details) $ in Thousands		1 Months Ended	3 Months Ended	5 Months Ended	12 Months Ended
	Feb. 03, 2022	Feb. 03, 2023 USD ($)	Mar. 31, 2023 shares	Jun. 07, 2023 USD ($)	Dec. 31, 2023 yr option_holder
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Option liability, vesting period	1 year
Number of option holders | option_holder					2
Stock issued during period, shares, conversion of convertible securities (in shares) | shares			34,588
Proceeds from exercise of option liabilities | $		$ 5,836
Loans
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Interest expense, debt | $				$ 30
Monte Carlo Simulation | Measurement Input, Expected Term
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Business combination, contingent consideration, liability, measurement input | yr					3
Monte Carlo Simulation | Measurement Input, Risk Free Interest Rate
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Business combination, contingent consideration, liability, measurement input					0.041
Monte Carlo Simulation | Measurement Input, Operating Asset Volatility
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Business combination, contingent consideration, liability, measurement input					0.385
Black-Scholes Merton Model | Measurement Input, Expected Term
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrants and rights outstanding, measurement input | yr					5
Black-Scholes Merton Model | Measurement Input, Risk Free Interest Rate
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrants and rights outstanding, measurement input					0.038
Black-Scholes Merton Model | Measurement Input, Offered Price
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrants and rights outstanding, measurement input					10.10
Black-Scholes Merton Model | Measurement Input, Price Volatility
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrants and rights outstanding, measurement input					0.394
Black-Scholes Merton Model | Measurement Input, Strike Price
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrants and rights outstanding, measurement input					11.50

Net Loss per Share_Unit - Sched

Net Loss per Share/Unit - Schedule of Antidilutive Securities Excluded From Computation of Earnings Per Share (Successor) (Details) - shares	5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 07, 2023	Dec. 31, 2023	Dec. 31, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	119,076	164,515,242	972,193
Public Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)		8,622,235
Private Placement Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)		10,900,000
Earnout Shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)		328,925
BHES Bonus Shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)		2,068,416
Common Stock | Unvested Class A OpCo Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)		848,415
Common Stock | Class A Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)		141,304,030
Restricted Stock Units (RSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)		443,221

Net Loss per Share_Unit - Sch_2

Net Loss per Share/Unit - Schedule of Earnings Per Share, Basic, and Diluted, For Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 07, 2023	Dec. 31, 2023	Dec. 31, 2022
Numerator
Comprehensive loss	$ (34,176)	$ (43,056)	$ (54,778)
Net loss attributable to shareholders	$ (34,176)		$ (54,778)
Denominator
Weighted-average number shares outstanding, diluted (in shares)	3,766,871	69,755,848	3,702,803
Weighted-average number shares outstanding, basic (in shares)	3,766,871	69,755,848	3,702,803
Net loss per share attributable to shareholders, diluted (in dollars per share)	$ (9.07)	$ (0.62)	$ (14.79)
Net loss per share attributable to shareholders, basic (in dollars per share)	$ (9.07)	$ (0.62)	$ (14.79)
Class A Common Stock
Numerator
Comprehensive loss		$ (141,816)
Net loss attributable to shareholders		$ (43,056)
Denominator
Weighted-average number shares outstanding, diluted (in shares)		69,756,000
Weighted-average number shares outstanding, basic (in shares)		69,756,000
Net loss per share attributable to shareholders, diluted (in dollars per share)		$ (0.62)
Net loss per share attributable to shareholders, basic (in dollars per share)		$ (0.62)

Net Loss per Share_Unit - Sch_3

Net Loss per Share/Unit - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Predecessor) (Details) - shares	5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 07, 2023	Dec. 31, 2023	Dec. 31, 2022
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	119,076	164,515,242	972,193
Unvested profits interests
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	119,076		226,494
Member loan share options
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	0		34,588
Occidental Petroleum share options
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	0		711,111

Net Loss per Share_Unit - Sch_4

Net Loss per Share/Unit - Schedule of Earnings Per Share, Basic and Diluted, For Membership Interests (Details) - USD ($) $ / shares in Units, $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 07, 2023	Dec. 31, 2023	Dec. 31, 2022
Numerator
Comprehensive loss	$ (34,176)	$ (43,056)	$ (54,778)
Net loss attributable to shareholders	$ (34,176)		$ (54,778)
Denominator
Weighted-average number membership interests outstanding, basic (in shares)	3,766,871	69,755,848	3,702,803
Weighted-average number membership interests outstanding, diluted (in shares)	3,766,871	69,755,848	3,702,803
Net loss per unit attributable to membership interest holders, basic (in dollars per share)	$ (9.07)	$ (0.62)	$ (14.79)
Net loss per unit attributable to membership interest holders, diluted (in dollars per share)	$ (9.07)	$ (0.62)	$ (14.79)

Shareholders' Equity and Non-_3

Shareholders' Equity and Non-Controlling Interest - Narrative (Details)	7 Months Ended	12 Months Ended
	Dec. 31, 2023 tranche vote $ / shares shares	Dec. 31, 2023 tranche trading_day vote $ / shares shares	Aug. 16, 2023	Jun. 07, 2023 shares	Dec. 31, 2022 $ / shares shares
Class of Stock [Line Items]
Stockholders' equity, shares authorized (in shares)	831,000,000	831,000,000
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)					4,987,845
Preferred stock, shares outstanding (in shares)	0	0
Common stock (in shares)					3,722,355
Lockup shares, shares vested, percentage	67%	67%
Common units, conversion, ratio			1
Common stock, shares, issued (in shares)					3,722,355
Price Based Lockup Shares
Class of Stock [Line Items]
Lockup shares, transfer threshold		3 years
Lockup shares, shares, lockup provision removed, percentage	67%	67%
Common stock, remaining shares subject to vesting and transfer restrictions (in shares)	14,848,184	14,848,184
Price Based Lockup Shares | Price Based Lockup Shares, Transfer Tranche One
Class of Stock [Line Items]
Lockup shares, percentage of shares transferable	0.33	0.33
Price Based Lockup Shares | Price Based Lockup Shares, Transfer Tranche Two
Class of Stock [Line Items]
Lockup shares, percentage of shares transferable	0.33	0.33
Price Based Lockup Shares | Price Based Lockup Shares, Transfer Tranche Three
Class of Stock [Line Items]
Lockup shares, percentage of shares transferable	1	1
Time-Based Lockup Shares
Class of Stock [Line Items]
Lockup shares, transfer threshold		1 year
Class A Common Stock
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	520,000,000	520,000,000			520,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.0001	$ 0.0001			$ 0.0001
Common stock (in shares)	71,277,906	71,277,906			0
Number of votes for each share of common stock | vote	1	1
Redeemable non-controlling interests in subsidiary	0	0		34,500,000
Redeemable non-controlling interest percentage of common units	67%
Common stock subject to vesting and transfer restrictions (in shares)	986,775	986,775
Number of tranches | tranche	3	3
Common stock, shares, issued (in shares)	71,277,906	71,277,906			0
Class A Common Stock | Price Based Lockup Shares
Class of Stock [Line Items]
Common stock, lockup shares (in shares)	44,544,551	44,544,551
Lockup shares, threshold trading days | trading_day		20
Lockup shares, threshold consecutive trading days | trading_day		30
Class A Common Stock | Price Based Lockup Shares | Price Based Lockup Shares, Transfer Tranche One
Class of Stock [Line Items]
Share price (in usd per share) | $ / shares	$ 12	$ 12
Class A Common Stock | Price Based Lockup Shares | Price Based Lockup Shares, Transfer Tranche Two
Class of Stock [Line Items]
Share price (in usd per share) | $ / shares	14	14
Class A Common Stock | Price Based Lockup Shares | Price Based Lockup Shares, Transfer Tranche Three
Class of Stock [Line Items]
Share price (in usd per share) | $ / shares	$ 16	$ 16
Class A Common Stock | Time-Based Lockup Shares
Class of Stock [Line Items]
Common stock, lockup shares (in shares)	89,449,655	89,449,655
Lockup shares, threshold trading days | trading_day		20
Lockup shares, threshold consecutive trading days | trading_day		30
Share price (in usd per share) | $ / shares	$ 12	$ 12
Class A Common Stock | Earnout Shares Vesting, Tranche One
Class of Stock [Line Items]
Volume weighted average stock price trigger (in usd per share) | $ / shares	12	$ 12
Earnout shares vesting, threshold trading days | trading_day		20
Earnout shares vesting, threshold consecutive trading days | trading_day		30
Class A Common Stock | Earnout Shares Vesting, Tranche Two
Class of Stock [Line Items]
Volume weighted average stock price trigger (in usd per share) | $ / shares	$ 14	$ 14
Earnout shares vesting, threshold trading days | trading_day		20
Earnout shares vesting, threshold consecutive trading days | trading_day		30
Class A Common Stock | Earnout Shares Vesting, Tranche Three
Class of Stock [Line Items]
Volume weighted average stock price trigger (in usd per share) | $ / shares		$ 16
Earnout shares vesting, threshold trading days | trading_day		20
Earnout shares vesting, threshold consecutive trading days | trading_day		30
Earnout shares, term		3 years
Class A Common Stock | OpCo
Class of Stock [Line Items]
Common stock subject to vesting and transfer restrictions (in shares)	128,908,518	128,908,518
Common stock, remaining shares subject to vesting and transfer restrictions (in shares)	328,925	328,925
Class A Common Stock | NET Power, Inc.
Class of Stock [Line Items]
Common stock subject to vesting and transfer restrictions (in shares)	54,047,495	54,047,495
Class A Common Stock | OpCo
Class of Stock [Line Items]
Subsidiary, ownership percentage	33%	33%
Class A Common Stock | Common Stock
Class of Stock [Line Items]
Common stock (in shares)	71,277,906	71,277,906		0
Redeemable non-controlling interests in subsidiary	140,610,089	140,610,089
Class B ordinary shares
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	310,000,000	310,000,000			310,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.0001	$ 0.0001			$ 0.0001
Common stock (in shares)	141,787,429	141,787,429			0
Number of votes for each share of common stock | vote	1	1
Common stock subject to vesting and transfer restrictions (in shares)	6,072,463	6,072,463
Common stock, shares, issued (in shares)	141,787,429	141,787,429			0
Class B ordinary shares | Price Based Lockup Shares
Class of Stock [Line Items]
Common stock, lockup shares (in shares)	1,575,045	1,575,045
Class B ordinary shares | Time-Based Lockup Shares
Class of Stock [Line Items]
Common stock, lockup shares (in shares)	3,510,643	3,510,643
Class B ordinary shares | OpCo
Class of Stock [Line Items]
Common stock subject to vesting and transfer restrictions (in shares)	7,624,999	7,624,999
Class B ordinary shares | Common Stock
Class of Stock [Line Items]
Common stock (in shares)	141,787,429	141,787,429		0
Redeemable non-controlling interests in subsidiary	6,967,050	6,967,050

Shareholders' Equity and Non-_4

Shareholders' Equity and Non-Controlling Interest - Summary of Calculation of Non-Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 07, 2023	Dec. 31, 2023	Dec. 31, 2022
Class of Stock [Line Items]
Net loss before income tax	$ (34,176)	$ (147,523)	$ (54,778)
Class A Common Stock
Class of Stock [Line Items]
Redeemable non-controlling interest percentage of common units		67%
Comprehensive loss attributable to common units		$ (98,760)

Share-Based Payments - Narrativ

Share-Based Payments - Narrative (Details) $ in Thousands		12 Months Ended
	Jun. 08, 2023 USD ($) shares	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 USD ($)
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Remaining Compensation Cost | $	$ 6,178	$ 2,352	$ 9,312
Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition		3 years	1 year
Restricted Stock Units (RSUs)
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Remaining Compensation Cost | $		$ 5,188
Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition		3 years
OpCo
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Accelerated (in shares)	30,000
Share-based payment arrangement, accelerated cost | $	$ 1,624
Share-based compensation arrangement by share-based payment award, equity instruments other than options, forfeited in period (in shares)	30,000
BHES
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Gain (loss) on stock issued during period, value, issued for services | $	$ (17,500)
Gain (loss) on stock issued during period, value, issued for services, inception-to-date | $	$ (2,971)
Class A Common Stock | OpCo
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock issued during period, shares, acquisitions (in shares)	451,356
Shares issued, shares, share-based payment arrangement, forfeited (in shares)	324,568
Class A Common Stock | BHES
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock issued during period, shares, conversion of units (in shares)	1,500,265
Class B ordinary shares | OpCo
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock issued during period, shares, acquisitions (in shares)	451,356
Shares issued, shares, share-based payment arrangement, forfeited (in shares)	324,568
Class B ordinary shares | BHES
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock issued during period, shares, conversion of units (in shares)	1,500,265
Omnibus Incentive Plan | Restricted Stock Units (RSUs)
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based payment, number of shares authorized (in shares)		443,221
Share-based payments, award vesting period		3 years
Omnibus Incentive Plan | Class A Common Stock
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares reserved for future issuance, annual increase, percentage		20,468,545
Shares reserved for future issuance, percentage		0.05
Joint Development Agreement | BHES
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock issued during period, shares, acquisitions (in shares)	47,000

Share-Based Payments - Schedule

Share-Based Payments - Schedule of Equity Awards Activity (Details) - $ / shares	5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 07, 2023	Dec. 31, 2023	Dec. 31, 2023
Common Stock
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward]
Unvested equity awards at the beginning of the period (in shares)		1,895,122
Granted (in shares)		0
Forfeited (in shares)		(324,568)
Redeemed (in shares)		(30,069)
Accelerated (in shares)		(692,070)
Unvested equity awards at the end of the period (in shares)	1,895,122	848,415	848,415
Unvested equity awards at the beginning of the period (in dollars per share)		$ 4.95
Granted (in dollars per share)		0
Forfeited (in dollars per share)		5.66
Redeemed (in dollars per share)		4.32
Accelerated (in dollars per share)		4.32
Unvested equity awards at the end of the period (in dollars per share)	$ 4.95	$ 4.62	$ 4.62
Membership Interests
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward]
Unvested equity awards at the beginning of the period (in shares)	226,494	119,076	226,494
Granted (in shares)	0
Forfeited (in shares)	0
Redeemed (in shares)	(107,418)
Accelerated (in shares)	0
Unvested equity awards at the end of the period (in shares)	119,076
Unvested equity awards at the beginning of the period (in dollars per share)	$ 63.25	$ 63.32	$ 63.25
Granted (in dollars per share)	0
Forfeited (in dollars per share)	0
Redeemed (in dollars per share)	63.18
Accelerated (in dollars per share)	0
Unvested equity awards at the end of the period (in dollars per share)	$ 63.32

Share-Based Payments - Schedu_2

Share-Based Payments - Schedule of Restricted Stock Unit Activity (Details) - $ / shares	5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 07, 2023	Dec. 31, 2023	Dec. 31, 2023
Common Stock
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward]
Unvested equity awards at the beginning of the period (in shares)		1,895,122
Granted (in shares)		0
Forfeited (in shares)		(324,568)
Redeemed (in shares)		(30,069)
Accelerated (in shares)		(692,070)
Unvested equity awards at the end of the period (in shares)	1,895,122	848,415	848,415
Unvested equity awards at the beginning of the period (in dollars per share)		$ 4.95
Granted (in dollars per share)		0
Forfeited (in dollars per share)		5.66
Redeemed (in dollars per share)		4.32
Accelerated (in dollars per share)		4.32
Unvested equity awards at the end of the period (in dollars per share)	$ 4.95	$ 4.62	$ 4.62
Membership Interests
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward]
Unvested equity awards at the beginning of the period (in shares)	226,494	119,076	226,494
Granted (in shares)	0
Forfeited (in shares)	0
Redeemed (in shares)	(107,418)
Accelerated (in shares)	0
Unvested equity awards at the end of the period (in shares)	119,076
Unvested equity awards at the beginning of the period (in dollars per share)	$ 63.25	$ 63.32	$ 63.25
Granted (in dollars per share)	0
Forfeited (in dollars per share)	0
Redeemed (in dollars per share)	63.18
Accelerated (in dollars per share)	0
Unvested equity awards at the end of the period (in dollars per share)	$ 63.32
Restricted Stock Units (RSUs) | Common Stock
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward]
Unvested equity awards at the beginning of the period (in shares)		0
Granted (in shares)		443,221
Forfeited (in shares)		0
Redeemed (in shares)		0
Accelerated (in shares)		0
Unvested equity awards at the end of the period (in shares)	0	443,221	443,221
Unvested equity awards at the beginning of the period (in dollars per share)		$ 0
Granted (in dollars per share)		13.43
Forfeited (in dollars per share)		0
Redeemed (in dollars per share)		0
Accelerated (in dollars per share)		0
Unvested equity awards at the end of the period (in dollars per share)	$ 0	$ 13.43	$ 13.43

Share-Based Payments - Schedu_3

Share-Based Payments - Schedule of Share-Based Payments Issued to BHES (Details) - BHES - BHES JDA - USD ($) $ / shares in Units, $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 07, 2023	Dec. 31, 2023	Dec. 31, 2023
Quantity
Membership Interests (in shares)	9,210	0
Total Fair Value
Membership Interests	$ 1,943	$ 0
Stock issued during period, value, issued for services	$ 3,901	$ 8,172
Membership interests, fair value or equivalent value per unit (in dollars per share)			$ 168.75
Class A Common Stock
Quantity
Stock issued during period, shares, issued for services (in shares)	296,160	1,236,265
Total Fair Value
Stock issued during period, value, issued for services	$ 1,958	$ 8,172
Share-based compensation, common stock, fair value or equivalent value per unit (in dollars per share)			5.29
Class B ordinary shares
Quantity
Stock issued during period, shares, issued for services (in shares)	296,160	1,236,265
Total Fair Value
Stock issued during period, value, issued for services	$ 0	$ 0
Share-based compensation, common stock, fair value or equivalent value per unit (in dollars per share)			$ 0

Share-Based Payments - Schedu_4

Share-Based Payments - Schedule of Compensation Payable to BHES (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Jun. 08, 2023	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Compensation Cost Incurred To Date		$ 21,167
Remaining Compensation Cost	$ 2,352	6,178	$ 9,312
Total Compensation Cost		$ 27,345

Leases - Narrative (Details)

Leases - Narrative (Details)	5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 07, 2023 USD ($)	Dec. 31, 2023 USD ($) lease	Dec. 31, 2023 USD ($) lease	Dec. 31, 2022 USD ($)	Oct. 06, 2023	Jun. 06, 2022
Lessee, Lease, Description [Line Items]
Number of operating leases | lease		2	2
Operating lease, cost	$ 260,000	$ 85,000		$ 95,000
Lessee, operating lease, discount rate						8%
Lease right-of-use asset		2,212,000	$ 2,212,000	$ 784,000
Measurement Building Lease
Lessee, Lease, Description [Line Items]
Lessee, operating lease, term of contract						60 months
Roney St. Lease
Lessee, Lease, Description [Line Items]
Lessee, operating lease, term of contract					62 months
Operating lease, liability		2,155,000	2,155,000
Lease right-of-use asset		$ 2,059,000	$ 2,059,000
Operating lease, early termination, term		50 months	50 months
Land
Lessee, Lease, Description [Line Items]
Lease right-of-use asset		$ 153,000	$ 153,000
Operating lease, annual lease payment			$ 1

Leases - Schedule of Future Min

Leases - Schedule of Future Minimum Lease Payments (Details) - Roney St. Lease $ in Thousands	Dec. 31, 2023 USD ($)
Lessee, Lease, Description [Line Items]
2024	$ 504
2025	517
2026	531
2027	545
2028	512
2029 and thereafter	0
Total	$ 2,608

Commitments and Contingencies -

Commitments and Contingencies - Reconciliation of Asset Retirement Obligations (Details) - USD ($) $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 07, 2023	Dec. 31, 2023	Dec. 31, 2022
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset retirement obligation, beginning of period	$ 2,416	$ 2,518
Obligation incurred	0	0	$ 2,201
Periodic accretion expense	102	93	215
Asset retirement obligation, end of period	$ 2,518	$ 2,060	$ 2,416

Commitment and Contingencies -

Commitment and Contingencies - Schedule of Unconditional Purchase Obligations (Details) - USD ($) $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 07, 2023	Dec. 31, 2023	Dec. 31, 2022
Unrecorded Unconditional Purchase Obligation [Line Items]
Gross Commitment		$ 166,009
Unrecorded unconditional purchase obligation, recognized in current period	$ 7,410	17,095	$ 4,422
Remaining Commitment		137,082
Asset purchase commitments | Cash
Unrecorded Unconditional Purchase Obligation [Line Items]
Gross Commitment		26,009
Unrecorded unconditional purchase obligation, recognized in current period	1,168	4,023	0
Remaining Commitment		20,818
Joint Development Agreements, Paid In Cash
Unrecorded Unconditional Purchase Obligation [Line Items]
Gross Commitment		70,000
Unrecorded unconditional purchase obligation, recognized in current period	3,121	6,536	2,211
Remaining Commitment		58,132
Joint Development Agreements, Paid In Share-Based Payments
Unrecorded Unconditional Purchase Obligation [Line Items]
Gross Commitment		70,000
Unrecorded unconditional purchase obligation, recognized in current period	$ 3,121	6,536	$ 2,211
Remaining Commitment		$ 58,132

Commitments and Contingencies_2

Commitments and Contingencies - Schedule of Unrecognized Purchase Commitments (Details) - USD ($) $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 07, 2023	Dec. 31, 2023	Dec. 31, 2022
Other Commitments [Line Items]
Gross Commitment		$ 166,009
Unrecorded unconditional purchase obligation, recognized in current period	$ 7,410	17,095	$ 4,422
Remaining Commitment		137,082
Joint Development Agreements, Paid In Cash
Other Commitments [Line Items]
Gross Commitment		70,000
Unrecorded unconditional purchase obligation, recognized in current period	3,121	6,536	2,211
Remaining Commitment		58,132
Joint Development Agreements, Paid In Share-Based Payments
Other Commitments [Line Items]
Gross Commitment		70,000
Unrecorded unconditional purchase obligation, recognized in current period	3,121	6,536	2,211
Remaining Commitment		58,132
Cash | Asset purchase commitments
Other Commitments [Line Items]
Gross Commitment		26,009
Unrecorded unconditional purchase obligation, recognized in current period	$ 1,168	4,023	$ 0
Remaining Commitment		$ 20,818

Commitments and Contingencies_3

Commitments and Contingencies - Schedule of Costs Associated with JDA (Details) - BHES - USD ($) $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 07, 2023	Dec. 31, 2023	Dec. 31, 2022
Other Commitments [Line Items]
Cash expense	$ 3,121	$ 6,536	$ 2,211
Class A OpCo Units issued			30,000
BHES Bonus Share expense	4,690	6,620	9,857
Research and development	11,713	21,328	14,833
Membership Interests
Other Commitments [Line Items]
Class A OpCo Units issued	3,902	0	2,765
Common Stock
Other Commitments [Line Items]
Class A OpCo Units issued	$ 0	$ 8,172	$ 0

Income Taxes - Schedule of Curr

Income Taxes - Schedule of Current and Deferred Income Taxes (Details) - USD ($) $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 07, 2023	Dec. 31, 2023	Dec. 31, 2022
Federal
Current tax expense (benefit)		$ 0
Deferred tax expense (benefit)		(5,542)
Total federal		(5,542)
State and local
Current tax expense (benefit)		0
Deferred tax expense (benefit)		(165)
Total state and local		(165)
Total	$ 0	$ (5,707)	$ 0

Income Taxes - Schedule of Effe

Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details)	7 Months Ended
	Dec. 31, 2023
Income Tax Disclosure [Abstract]
U.S. federal statutory rate	21%
Increase (decrease) due to:
State income taxes, net of federal income tax benefit	0.10%
Non-controlling interests	(14.10%)
Equity transactions	(3.80%)
Other permanent adjustments	(0.50%)
Change in investment in OpCo	(2.50%)
Valuation allowance	3.70%
Effective tax rate	3.90%

Income Taxes - Schedule of Temp

Income Taxes - Schedule of Temporary Differences (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Jun. 08, 2023
Deferred tax assets
Federal net operating losses	$ 1,976
State net operating losses	186
Investment in OpCo	62,972
Deferred tax assets, gross	65,134
Valuation allowance	(62,972)
Deferred tax assets, net	2,162	$ 77,700
Deferred tax liabilities
Property, plant and equipment and developed technology	(59,881)
Deferred tax liabilities, gross	(59,881)
Deferred tax liabilities, net	$ (57,719)

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($)	7 Months Ended
	Dec. 31, 2023	Jun. 08, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Deferred tax assets, net	$ 2,162,000	$ 77,700,000
Valuation allowance, deferred tax asset, increase (decrease), amount	(14,728,000)
Unrecognized tax benefits	0
Tax Receivable Agreement liability	$ 8,937,000		$ 0

Uncategorized Items - npwr-2023

Label	Element	Value
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents	us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	$ 357,019,000
Asset Retirement Obligation	us-gaap_AssetRetirementObligation	2,416,000
Asset Retirement Obligation	us-gaap_AssetRetirementObligation	$ 1,967,000