UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 13, 2024 NET POWER INC. (Exact name of registrant as specified in its charter) Delaware 001-40503 98-1580612 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.) 320 Roney St., Suite 200 Durham, North Carolina 27701 (Address of principal ...