As filed with the Securities and Exchange Commission on September 15, 2023 No. 333-273183 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 _________________________________________ AMENDMENT NO. 1 TO FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 _________________________________________ NET POWER INC. (Exact name of registrant as specified in its charter) _________________________________________ | | | --- | Delaware 3620 98-1580612 (Primary Standard Industrial Clas ...

As filed with the Securities and Exchange Commission on July 7, 2023 No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 _________________________________________ FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 _________________________________________ NET POWER INC. (Exact name of registrant as specified in its charter) _________________________________________ | | | (State or other jurisdiction of incorporation or organization) (Primary Standard Industrial Cla ...