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Cover
Mar. 11, 2024
Aug. 14, 2023
Document Information [Line Items]    
Document Type   8-K
Document Period End Date Jun. 04, 2024  
Entity Registrant Name   NET POWER INC.
Entity Incorporation, State or Country Code   DE
Entity File Number   001-40503
Entity Tax Identification Number   98-1580612
Entity Address, Postal Zip Code   27701
City Area Code   (919)
Local Phone Number   287-4750
Written Communications   false
Soliciting Material   false
Pre-commencement Tender Offer   false
Pre-commencement Issuer Tender Offer   false
Title of 12(b) Security   Class A Common Stock, par value $0.0001 per share
Trading Symbol   NPWR
Security Exchange Name   NYSE
Entity Emerging Growth Company   true
Entity Ex Transition Period   false
Entity Central Index Key   0001845437
Amendment Flag   false
Entity Address, City or Town   Durham
Entity Address, State or Province   NC
Warrant    
Document Information [Line Items]    
Title of 12(b) Security   Warrants, each exercisable for one share of Class A Common Stock at a price of $11.50
Trading Symbol   NPWR WS
Security Exchange Name   NYSE