NET Power and Rice Acquisition Corp. II Secure $50 Million PIPE Commitment from SK Group and Announce Intent to Form Joint Venture to Accelerate Deployment of NET Power Plants in Asia

• NET Power adds another strategic investor in SK and increases total committed capital to $560 million for the proposed business combination with RONI
• NET Power-SK proposed Joint Venture expected to leverage SK's regional expertise to catalyze development of NET Power plants in Asia

NET Power, LLC ("NET Power") and Rice Acquisition Corp. II (NYSE:RONI) ("RONI") today announced a $50 million PIPE commitment from SK Group ("SK") in connection with NET Power's and RONI's proposed business combination. The groups also announced their intent to establish a NET Power-SK Joint Venture to pursue the origination and development of utility-scale NET Power plants across Asia.

The proposed NET Power-SK Joint Venture is expected to utilize NET Power's patented oxy-combustion supercritical CO₂ power cycle with SK's regional footprint and project development expertise to deploy clean, reliable and low-cost power across key Asian markets. Project origination and development work are expected to include activities such as site selection, supply and offtake contracting, financing and permitting.

Danny Rice, the incoming CEO of NET Power, emphasized the importance of decarbonizing Asian power generation to achieve global emissions goals. "Asian power generation, which is primarily fueled by coal, accounts for nearly 25% of global emissions," he said. "We believe that NET Power possesses the most cost-effective technology for decarbonizing fossil fuel-based power generation, and we are thrilled to partner with SK to deploy our NET Power plants on a large scale throughout Asia. SK is one of the largest and most respected conglomerates globally, and combining our expertise with their resources could accelerate our deployment in one of the largest markets for NET Power, and undoubtedly the most critical market for the planet."

"NET Power's technology is expected to help SK accomplish our pledge to achieve carbon net-zero across all businesses by 2050. Deploying NET Power plants throughout Asia is an important step forward in decarbonizing the region and ending a prevailing dependence on high-carbon intensity baseload power generation," said SK Inc. Materials President Young-wook Lee.

The new investment from SK brings the expected investment in NET Power to $895 million, consisting of approximately $345 million from RONI's trust account (assuming no redemptions), approximately $540 million from the PIPE raised entirely at $10.00 per share of common stock and $10 million from interim financing from an existing owner of NET Power to support its operations through the closing of the business combination. Assuming no RONI shareholders exercise their redemption rights, the combined company is expected to have a market capitalization in excess of $2.0 billion.

NET Power and SK expect to each own a 50% stake in the common equity of the NET Power-SK Joint Venture, which is subject to negotiation and execution of definitive documentation.

As previously disclosed, NET Power expects to need only $200 million of net proceeds from the business combination and the PIPE to fully fund corporate operations through commercialization of SN1, which is expected to be operational in 2026. The anticipated net proceeds above $200 million are expected to support SN1 capital needs and future commercial origination efforts.

Expected Sources & Uses

Illustrative Pro Forma Valuation

Illustrative Pro Forma Ownership

About NET Power

NET Power is a clean energy technology company whose mission is to globally deploy affordable and reliable zero-emissions energy. The Company invents, develops, and licenses clean power generation technology. Founded in 2010 and headquartered in Durham, North Carolina, NET Power has received strategic investments from key industry partners including 8 Rivers, Constellation, Occidental, and Baker Hughes. For more information, please visit https://netpower.com/.

About Rice Acquisition Corp. II

RONI is led by Daniel Rice IV and Kyle Derham, former executives of Rice Energy, Inc. ("RICE") and Rice Midstream Partners ("RMP"). In 2018 and 2019, RICE and RMP merged with EQT Corporation (NYSE:EQT) and EQT's midstream affiliates for over $10 billion to become the largest U.S. natural gas producer. Rice Acquisition Corp. led a 2021 business combination with Archaea Energy LLC and Aria Energy LLC to create Archaea Energy, Inc. (NYSE:LFG), an industry-leading renewable natural gas platform that BP p.l.c. (NYSE:BP) acquired for a cash consideration of $4.1 billion in December 2022, generating a 2.6x return on investment for LFG PIPE investors in approximately one year. Daniel Rice currently serves on the board of EQT. The RONI website is https://ricespac.com/rac-ii/.

About SK

SK Group, South Korea's second-largest conglomerate, is a collection of global industry-leading companies driving innovations in semiconductors, sustainable energy, telecommunications and life sciences. Based in Seoul, SK invests in building businesses around the world with a shared commitment to reducing global greenhouse gas emissions and increasing the use of renewable energy.

SK companies combined have $139 billion in global annual revenue and employ more than 100,000 people worldwide. SK companies are investing billions of dollars in expanding their U.S. presence with business operations or partnerships in hydrogen energy and fuel cells, EV battery manufacturing and technology, energy storage solutions, pharmaceutical manufacturing and development, semiconductors, and advanced materials. For more information, visit sk.com.

Important Information about the Transaction and Where to Find It

This press release relates to, among other matters, a proposed business combination transaction involving NET Power and RONI. In connection with the transaction, RONI has filed with the U.S. Securities and Exchange Commission ("SEC") a registration statement on Form S-4 (File No. 333-268975), including a proxy statement and prospectus (the "Proxy Statement/Prospectus"). This document is not a substitute for the Proxy Statement/Prospectus. The definitive Proxy Statement/Prospectus was filed with the SEC on May 10, 2023 and has been or will be sent to all RONI shareholders as of April 18, 2023 (the record date for voting on the proposed transaction). RONI may also file other relevant documents regarding the proposed transaction with the SEC. BEFORE MAKING ANY VOTING OR INVESTMENT DECISION, SECURITY HOLDERS OF RONI AND OTHER INTERESTED PARTIES ARE URGED TO READ THE REGISTRATION STATEMENT, PROXY STATEMENT/PROSPECTUS AND ALL OTHER RELEVANT DOCUMENTS THAT ARE FILED OR WILL BE FILED WITH THE SEC IN CONNECTION WITH THE TRANSACTION, INCLUDING ANY AMENDMENTS OR SUPPLEMENTS TO THESE DOCUMENTS, CAREFULLY AND IN THEIR ENTIRETY WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT RONI, NET POWER, THE TRANSACTION AND RELATED MATTERS.

Investors and security holders of RONI may obtain free copies of the Proxy Statement/Prospectus and other documents that are filed or will be filed with the SEC by RONI through the website maintained by the SEC at www.sec.gov or at RONI's website at www.ricespac.com/rac-ii.

Participants in the Solicitation

RONI and NET Power and their respective directors and executive officers may be deemed to be participants in the solicitation of proxies from RONI's shareholders in connection with the transaction. A list of the names of such directors and executive officers and information regarding their interests in the proposed transaction between RONI and NET Power are contained in the Proxy Statement/Prospectus. You may obtain free copies of these documents as described in the preceding paragraph.

No Offer or Solicitation

This press release shall not constitute a solicitation of a proxy, consent or authorization with respect to any securities or in respect of the business combination. This press release shall also not constitute an offer to sell or the solicitation of an offer to buy any securities, nor shall there be any sale of securities in any states or jurisdictions in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. No offering of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act of 1933, as amended, or an exemption therefrom.

Forward-Looking Statements

This communication may contain certain forward-looking statements within the meaning of the federal securities laws with respect to (i) the PIPE, including commitments to the PIPE, and (ii) the proposed transaction between NET Power and RONI and the combined company. These forward-looking statements generally are identified by the words "believe," "project," "expect," "seek," "anticipate," "estimate," "intend," "strategy," "future," "opportunity," "plan," "may," "should," "could," "will," "would," "will be," "will continue," "will likely result" and similar expressions. Forward-looking statements are predictions, projections and other statements about future events that are based on current expectations and assumptions and, as a result, are subject to risks and uncertainties. Many factors could cause actual future events to differ materially from the forward-looking statements in this communication, including but not limited to: (i) conditions to the completion of the proposed business combination and PIPE investment, including shareholder approval of the business combination, may not be satisfied or the regulatory approvals required for the proposed business combination may not be obtained on the terms expected or on the anticipated schedule; (ii) the occurrence of any event, change or other circumstance that could give rise to the termination of the business combination agreement between the parties or the termination of any PIPE investor's subscription agreement; (iii) the effect of the announcement or pendency of the proposed business combination on NET Power's business relationships, operating results, and business generally; (iv) risks that the proposed business combination disrupts NET Power's current plans and operations; (v) risks related to diverting management's attention from NET Power's ongoing business operations; (vi) potential litigation that may be instituted against RONI or NET Power or their respective directors or officers related to the proposed transaction or the business combination agreement or in relation to NET Power's business; (vii) the amount of the costs, fees, expenses and other charges related to the proposed business combination and PIPE investment; (viii) risks relating to the uncertainty of the projected financial information with respect to NET Power or the combined company; (ix) NET Power's history of significant losses; (x) the combined company's ability to manage future growth effectively; (xi) the combined company's ability to utilize its net operating loss and tax credit carryforwards effectively; (xii) NET Power's ability to continue as a going concern if the transactions contemplated herein are not completed; (xiii) the capital-intensive nature of NET Power's business model, which may require the combined company to raise additional capital in the future; (xiv) barriers the combined company may face in its attempts to deploy and commercialize its technology; (xv) the complexity of the machinery NET Power relies on for its operations and development; (xvi) the combined company's ability to establish and maintain supply relationships; (xvii) risks related to NET Power's arrangements with third parties for the development, commercialization and deployment of technology associated with NET Power's technology; (xviii) risks related to NET Power's other strategic investors and partners; (xix) the combined company's ability to successfully commercialize its operations; (xx) the availability and cost of raw materials; (xxi) the ability of NET Power's supply base to scale to meet the combined company's anticipated growth; (xxii) risks related to NET Power's or the combined company's ability to meet its projections; (xxiii) the combined company's ability to expand internationally; (xxiv) the combined company's ability to update the design, construction and operations of the NET Power technology; (xxv) the impact of potential delays in discovering manufacturing and construction issues; (xxvi) the possibility of damage to NET Power's Texas facilities as a result of natural disasters; (xxvii) the ability of commercial plants using NET Power's technology to efficiently provide net power output; (xxviii) the combined company's ability to obtain and retain licenses; (xxix) the combined company's ability to establish an initial commercial scale plant; (xxx) the combined company's ability to license to large customers; (xxxi) the combined company's or NET Power's ability to accurately estimate future commercial demand; (xxxii) the combined company's ability to adapt to the rapidly evolving and competitive natural and renewable power industry; (xxxiii) the combined company's ability to comply with all applicable laws and regulations; (xxxiv) the impact of public perception of fossil fuel derived energy on the combined company's business; (xxxv) any political or other disruptions in gas producing nations; (xxxvi) the combined company's ability to protect its intellectual property and the intellectual property it licenses; (xxxvii) the ability to meet stock exchange listing standards following the consummation of the proposed business combination; (xxxviii) changes to the proposed structure of the proposed business combination that may be required or appropriate as a result of applicable laws or regulations, including recent proposals by the SEC or as a condition to obtaining regulatory approval of the proposed business combination; (xxxix) the impact of the global COVID-19 pandemic on any of the foregoing risks; and (xl) such other factors as are set forth in RONI's filings with the SEC, including but not limited to those described under the headings "Risk Factors" and "Cautionary Note Regarding Forward-Looking Statements" in the definitive Proxy Statement/Prospectus filed on May 10, 2023, and in its other filings made with the SEC from time to time, which are available via the SEC's website at www.sec.gov. These filings identify and address other important risks and uncertainties that could cause actual events and results to differ materially from those contained in the forward-looking statements. Forward-looking statements speak only as of the date they are made. Readers are cautioned not to put undue reliance on forward-looking statements, and NET Power and RONI assume no obligation and do not intend to update or revise these forward-looking statements, whether as a result of new information, future events, or otherwise. Neither NET Power nor RONI gives any assurance that either NET Power or RONI, or the combined company, will achieve its expectations.

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