NET Power Inc.

Shares that are properly voted via the Internet, mobile device, or by telephone or for which proxy cards are properly executed and returned will be voted at the Annual Meeting in accordance with the directions given or, in the absence of directions, will be voted in accordance with the Board’s recommendations as follows: “FOR” the election of each of the nominees to the Board named herein and “FOR” the ratification of the appointment of our independent auditor. It is not expected that any additional matters will be brought before the Annual Meeting, but if other matters are properly presented, the persons named as proxies in the proxy card or their substitutes will vote in their discretion on such matters.

Voting via the Internet, mobile device, or by telephone helps save money by reducing postage and proxy tabulation costs. To vote by any of these methods, read this Proxy Statement, have your Notice of Internet Availability of Proxy Materials, proxy card, or voting instruction form in hand, and follow the instructions below for your preferred method of voting. Each of these voting methods is available 24 hours per day, seven days per week.

We encourage you to cast your vote by one of the following methods:

The manner in which your shares may be voted depends on how your shares are held. If you own shares of record, meaning that your shares are book entries in your name so that you appear as a stockholder on the records of Continental Stock Transfer & Trust Company, our stock transfer agent, you may vote by proxy, meaning you authorize individuals named in the proxy card to vote your shares. You may provide this authorization by voting via the Internet, mobile device, by telephone, or (if you have received paper copies of our proxy materials) by returning a proxy card. You also may participate in and vote during the Annual Meeting. If you own Common Stock of record and you do not vote by proxy or at the Annual Meeting, your shares will not be voted.

If you own shares in street name, meaning that your shares are held by a bank, brokerage firm, or other nominee, you may instruct that institution on how to vote your shares. You may provide these instructions by voting via the Internet, mobile device, by telephone, or (if you have received paper copies of proxy materials through your bank, brokerage firm, or other nominee) by returning a voting instruction form received from that institution. You also may participate in and vote during the Annual Meeting. If you own Common Stock in street name and do not either provide voting instructions or vote during the Annual Meeting, the institution that holds your shares may nevertheless vote your shares on your behalf with respect to the ratification of the appointment of KPMG LLP as our independent auditor for the fiscal year ending December 31, 2026 but cannot vote your shares on any other matters being considered at the meeting.