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Cover
Jun. 29, 2023
Document Type 8-K
Amendment Flag false
Document Period End Date Jun. 29, 2023
Entity File Number 001-40503
Entity Registrant Name NET POWER INC.
Entity Central Index Key 0001845437
Entity Tax Identification Number 98-1580612
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 404 Hunt Street
Entity Address, Address Line Two Suite 410
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
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company true
Elected Not To Use the Extended Transition Period false
Class A Common Stock, par value $0.0001 per share  
Title of 12(b) Security Class A Common Stock, par value $0.0001 per share
Trading Symbol NPWR
Security Exchange Name NYSE
Warrants, each exercisable for one share of Class A Common Stock at a price of $11.50  
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