| Description of Organization and Business Operations | Note 1. Description of Organization and Business
Operations Organization and General Rice Acquisition Corp. II is a blank check company
incorporated as a Cayman Islands exempted company on February 2, 2021. As used herein, the “Company” refers to Rice Acquisition
Corp. II and its majority-owned and controlled operating subsidiary, Rice Acquisition Holdings II LLC (“OpCo”), unless the
context indicates otherwise. The Company was formed for the purpose of effecting a merger, capital stock exchange, asset acquisition,
stock purchase, reorganization, or similar business combination with one or more businesses (the “Business Combination”).
The Company is an early stage and emerging growth company and, as such, the Company is subject to all of the risks associated with early
stage and emerging growth companies. As of March 31, 2023, the Company had not commenced
any operations. All activity to date relates to the Company’s formation and the preparation for initial public offering (the “Initial
Public Offering”), described below, and, subsequent to the Initial Public Offering, identifying a target company for a Business
Combination. The Company will not generate any operating revenues until after the completion of its initial Business Combination, at the
earliest. The Company generates non-operating income in the form of interest income on investments from the proceeds derived from the
Initial Public Offering (as defined below). The Company has selected December 31 as its fiscal year end. The Company’s sponsor is Rice Acquisition
Sponsor II LLC, a Delaware limited liability company (the “Sponsor”). The registration statement for the Company’s Initial
Public Offering was declared effective on June 15, 2021. On June 18, 2021, the Company consummated its Initial Public Offering of 34,500,000
units (the “Units” and, with respect to the Class A ordinary shares included in the Units being offered, the “Public
Shares”), which included the full exercise of the underwriters’ option to purchase an additional 4,500,000 Units to cover
over-allotments, at $10.00 per Unit, generating gross proceeds of $345.0 million, and incurring offering costs of approximately $19.1
million, of which approximately $11.7 million and approximately $593,000 were for deferred underwriting commissions (see Note 5) and offering
costs allocated to the derivative warrant liabilities, respectively. Simultaneously with the closing of the Initial
Public Offering, the Company consummated the private placement (“Private Placement”) of 10,900,000 warrants (each, a “Private
Placement Warrant” and collectively, the “Private Placement Warrants”) at a price of $1.00 per Private Placement Warrant
to the Sponsor, generating proceeds of $10.9 million (see Note 4). Each Private Placement Warrant is exercisable to purchase one of the
Company’s Class A ordinary shares or one Class A Unit of OpCo together with a corresponding non-economic Class B ordinary share
of the Company. Following the Initial Public Offering, the Public
Shareholders (as defined below) hold a direct economic equity ownership interest in the Company in the form of Class A ordinary shares,
and an indirect ownership interest in Opco through the Company’s ownership of Class A Units of Opco. By contrast, the holders of
the Company’s Founder Shares and Sponsor Shares (each as defined below in Note 4), including officers and directors to the extent
they hold such shares (the “Initial Shareholders”), will own direct economic interests in Opco in the form of Class B Units
and a corresponding non-economic voting equity interest in the Company in the form of Class B ordinary shares, as well as a small direct
interest through the Sponsor Shares (see Note 4). Upon the closing of the Initial Public Offering
and the Private Placement, $345,026,000 of the net proceeds of the sale of the Units in the Initial Public Offering and of the Private
Placement Warrants in the Private Placement were placed in a trust account (“Trust Account”) located in the United States
with Continental Stock Transfer & Trust Company acting as trustee, and is invested only in U.S. “government securities”
within the meaning of Section 2(a)(16) of the Investment Company Act having a maturity of 185 days or less or in money market funds meeting
certain conditions under Rule 2a-7 promulgated under the Investment Company Act of 1940, as amended (the “Investment Company Act”),
which invest only in direct U.S. government treasury obligations, as determined by the Company, until the earlier of (i) the completion
of a Business Combination and (ii) the distribution of the Trust Account as described below. The Company’s management has broad discretion
with respect to the specific application of the net proceeds of the Initial Public Offering and the sale of the Private Placement Warrants,
although substantially all of the net proceeds are intended to be applied generally toward consummating a Business Combination. There
is no assurance that the Company will be able to complete a Business Combination successfully. The Company must complete one or more initial
Business Combinations having an aggregate fair market value of at least 80% of the net assets held in the Trust Account (net of amounts
disbursed to management for working capital purposes, if permitted, and excluding the amount of any deferred underwriting discount held
in the Trust Account) at the time of the agreement to enter into the initial Business Combination. However, the Company will only complete
a Business Combination if the post-business combination company owns or acquires 50% or more of the voting securities of the target or
otherwise acquires a controlling interest in the target sufficient for it not to be required to register as an investment company under
the Investment Company Act. The Company will provide the holders of the Company’s
outstanding Class A ordinary shares, par value $0.0001 per share (the “Public Shareholders”) with the opportunity to redeem
all or a portion of their Public Shares upon the completion of a Business Combination either (i) in connection with a shareholder meeting
called to approve the Business Combination or (ii) by means of a tender offer. The decision as to whether the Company will seek shareholder
approval of a Business Combination or conduct a tender offer will be made by the Company, solely in its discretion. The Public Shareholders
will be entitled to redeem their Public Shares for a pro rata portion of the amount then held in the Trust Account (initially at $10.00
per Public Share, plus any pro rata interest earned on the funds held in the Trust Account and not previously released to the Company
to pay its tax obligations). The per-share amount to be distributed to Public Shareholders who redeem their Public Shares will not be
reduced by the deferred underwriting commissions the Company will pay to the underwriters (as discussed in Note 5). These Public Shares
were recorded at a redemption value and classified as temporary equity upon the completion of the Initial Public Offering in accordance
with the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 480, “Distinguishing
Liabilities from Equity.” The Company will proceed with a Business Combination if a majority of the shares voted are voted in favor
of the Business Combination. The Company will not redeem the Public Shares
in an amount that would cause its net tangible assets to be less than $5,000,001. If a shareholder vote is not required by law and the
Company does not decide to hold a shareholder vote for business or other reasons, the Company will, pursuant to its amended and restated
memorandum and articles of association, conduct the redemptions pursuant to the tender offer rules of the U.S. Securities and Exchange
Commission (“SEC”) and file tender offer documents with the SEC prior to completing a Business Combination. If, however, shareholder
approval of the transaction is required by law, or the Company decides to obtain shareholder approval for business or legal reasons, the
Company will offer to redeem shares in conjunction with a proxy solicitation pursuant to the proxy rules and not pursuant to the tender
offer rules. Additionally, each Public Shareholder may elect to redeem their Public Shares irrespective of whether they vote for or against
the proposed transaction. If the Company seeks shareholder approval in connection with a Business Combination, the Initial Shareholders
agreed to vote their Founder Units and any Public Shares purchased during or after the Initial Public Offering in favor of a Business
Combination. In addition, the Initial Shareholders agreed to waive their redemption rights with respect to their Founder Units and Public
Shares in connection with the completion of a Business Combination. If the Company is unable to complete a Business
Combination within 24 months from the closing of the Initial Public Offering, or June 18, 2023 (the “Combination Period”),
the Company will (i) cease all operations except for the purpose of winding up; (ii) as promptly as reasonably possible but not more than
ten business days thereafter, redeem the Public Shares, at a per-share price, payable in cash, equal to the aggregate amount then on deposit
in the Trust Account, including interest earned on the funds held in the Trust Account and not previously released to the Company to pay
taxes of the Company or Opco, if any (less up to $100,000 of interest to pay dissolution expenses), divided by the number of the then-outstanding
Public Shares and Class A Units of Opco (other than those held by the Company), which redemption will completely extinguish Public Shareholders’
rights as shareholders (including the right to receive further liquidating distributions, if any); and (iii) as promptly as reasonably
possible following such redemption, subject to the approval of the Company’s remaining shareholders and the Company’s board
of directors, liquidate and dissolve, subject in each case, to the Company’s obligations under Cayman Islands law to provide for
claims of creditors and the requirements of other applicable law. There will be no redemption rights or liquidating distributions with
respect to the warrants, which will expire worthless if the Company fails to consummate an initial Business Combination within 24 months
from the closing of the Initial Public Offering. Pursuant to the Opco LLC Agreement and a letter
agreement that the Sponsor, and the Company’s officers and directors have entered into with the Company, the Sponsor, and the Company’s
officers and directors agreed to waive their rights to liquidating distributions from the Trust Account with respect to any Founder Units
they hold if the Company fails to consummate an initial Business Combination within 24 months from the closing of the Initial Public Offering
(although they will be entitled to liquidating distributions from the Trust Account with respect to any Public Shares they hold if the
Company fails to complete an initial Business Combination within the prescribed time frame). Risks and Uncertainties In February 2022, the Russian Federation and Belarus
commenced a military action with the country of Ukraine. As a result of this action, various nations, including the United States, have
instituted economic sanctions against the Russian Federation and Belarus. The impact of this action and related sanctions on the world
economy is not determinable as of the date of these unaudited condensed consolidated financial statements. Proposed Business Combination On December 13, 2022, Rice Acquisition Corp. II, a
Cayman Islands exempted company (“RONI”), entered into a Business Combination Agreement (the “Original Business Combination
Agreement”), by and among RONI, Rice Acquisition Holdings II LLC, a Cayman Islands exempted company and majority-owned and
controlled operating subsidiary of RONI (“RONI Opco”), Topo Buyer Co, LLC, a Delaware limited liability company and a
direct, wholly owned subsidiary of RONI Opco (“RONI Buyer”), Topo Merger Sub, LLC, a Delaware limited liability company and
a direct, wholly owned subsidiary of RONI Buyer (“Merger Sub”), and NET Power, LLC, a Delaware limited liability company (“NET
Power”), on April 23, 2023, RONI Buyer and NET Power entered into the First Amendment to the Business Combination Agreement (the
“BCA Amendment” and, together with the Original Business Combination Agreement, as may be amended, supplemented or otherwise
modified from time to time, the “Proposed Business Combination Agreement” and the transactions contemplated thereby, collectively,
the “Proposed Business Combination”). Pursuant to the Proposed Business Combination Agreement, among other things:
(i) RONI
will change its jurisdiction of incorporation by deregistering as a Cayman Islands exempted company and continuing and domesticating
as a corporation incorporated under the laws of the State of Delaware, upon which (a) RONI will change its name to “NET Power Inc.”
(the “combined company”), (b) each then issued and outstanding Class A ordinary share of a par value $0.0001 each in
the capital of RONI will convert automatically, on a one-for-one basis, to a share of Class A common stock, par value $0.0001 per share,
of RONI (“Class A Common Stock”), (c) each then issued and outstanding Class B ordinary share of a par value $0.0001 each
in the capital of RONI will convert automatically, on a one-for-one basis, to a share of Class B common stock, par value $0.0001 per
share, of RONI (“Class B Common Stock”), and (d) each issued and outstanding warrant to purchase one Class A ordinary
share in the capital of RONI at a price of $11.50 per share will convert automatically, on a one-for-one basis, into a
whole warrant exercisable for one share of Class A Common Stock;
(ii) Following
RONI’s domestication, RONI Opco will change its jurisdiction of formation by deregistering as a Cayman Islands limited liability
company and continuing and domesticating as a limited liability company formed under the laws of the State of Delaware (together with
RONI’s domestication, the “Domestications”), upon which, (a) RONI Opco will change its name to “NET Power Holdings
LLC”, (b) each then issued and outstanding Class A Unit of RONI Opco will convert automatically, on a one-for-one basis, to a Class
A Unit of RONI Opco as issued and outstanding pursuant to the terms of A&R LLC Agreement (as defined below), and (c) each then issued
and outstanding Class B Unit of RONI Opco will convert automatically, on a one-for-one basis, to either (i) a Class A Unit of RONI Opco
as issued and outstanding pursuant to the A&R LLC Agreement or (ii) a Class B Unit of RONI Opco as issued and outstanding pursuant
to the terms of the A&R LLC Agreement; and (iii) Following the Domestications, Merger Sub will merge with and into NET Power, with NET Power surviving the merger as a direct, wholly owned subsidiary of RONI Buyer, on the terms and subject to the conditions of the certificate of merger, pursuant to which (a) all of the equity interests of NET Power that are issued and outstanding immediately prior to the Proposed Business Combination will, in connection with the Proposed Business Combination, be cancelled, cease to exist and be converted into the right to receive an aggregate of 137,192,563 Class A Units of RONI Opco and an equivalent number of shares of Class B Common Stock (one share of Class B Common Stock together with one Class A Unit or Class B Unit of RONI Opco, a “RONI Interest”), subject to adjustment for (i) NET Power shares issued pursuant to the Amended and Restated Joint Development Agreement, dated December 13, 2022, by and among NET Power; RONI; Opco; Nuovo Pignone International, S.r.l., an Italian limited liability company; and Nuovo Pignone Tecnologie S.r.l., an Italian limited liability company, as of the Closing Date and (ii) cash funding raised by NET Power following entry into the Proposed Business Combination Agreement and retained on its books as of the Closing Date, as allocated pursuant to the Proposed Business Combination Agreement, and (b) any equity interests of NET Power that are held in the treasury of NET Power or owned by any subsidiary of NET Power immediately prior to the Proposed Business Combination will be cancelled and cease to exist. Following the Proposed Business Combination, holders
of Class A Units of RONI Opco (other than RONI) will have the right (an “exchange right”), subject to certain limitations,
to exchange RONI Interests for, at RONI’s option, (i) shares of Class A Common Stock on a one-for-one basis, subject to adjustment
for stock splits, stock dividends, reorganizations, recapitalizations and the like (collectively, “adjustments”), or (ii)
a corresponding amount of cash. RONI’s decision to make a cash payment or issue shares upon an exercise of an exchange right will
be made by RONI’s independent directors, and such decision will be based on facts in existence at the time of the decision, which
RONI expects would include the relative value of the Class A Common Stock (including trading prices for the Class A Common Stock at the
time), the cash purchase price, the availability of other sources of liquidity (such as an issuance of preferred stock) to acquire the
Class A Units of RONI Opco and alternative uses for such cash, among other considerations. Holders of Class A Units of RONI Opco (other than
RONI) will generally be permitted to exercise the exchange right on a quarterly basis, subject to certain de minimis allowances. In addition,
additional exchanges may occur in connection with certain specified events, and any exchanges involving more than a specified number of
Class A Units of RONI Opco (subject to RONI’s discretion to permit exchanges of a lower number of units) may occur at any time upon
ten business days’ advanced notice. The exchange rights will be subject to certain limitations and restrictions intended to reduce
the administrative burden of exchanges upon RONI and ensure that RONI Opco will continue to be treated as a partnership for U.S. federal
income tax purposes. Consummation of the Proposed Business Combination
is generally subject to customary conditions of the respective parties and conditions customary to special purpose acquisition companies,
including (i) expiration or termination of all applicable waiting periods under the Hart-Scott-Rodino Antitrust Improvements Act of 1976
(“HSR”), (ii) the absence of any law or governmental order, threatened or pending, preventing the consummation of the Proposed
Business Combination, (iii) receipt of requisite approval for consummation of the Proposed Business Combination from RONI’s and
NET Power’s shareholders, (iv) RONI’s possession of at least $5,000,001 of net tangible assets, as determined in accordance
with Rule 3a51-1(g)(1) of the Securities Exchange Act of 1934, as amended, immediately after giving effect to the Proposed Business Combination
and (v) approval of the RONI shares being issued in connection with the Proposed Business Combination (including the PIPE Financing (as
defined below)) for listing on the New York Stock Exchange. The statutory HSR waiting period expired on February 6, 2023. Additionally, the obligation of NET Power to consummate
the Proposed Business Combination is further conditioned upon the sum of (i) the aggregate cash proceeds available for release from
RONI’s trust account (after giving effect to the exercise of redemption rights by RONI stockholders), plus (ii) the amount received
in respect of the PIPE Financing (whether funded by a current NET Power shareholder or by a third-party investor, and inclusive of funds
raised by NET Power during the period between signing and Closing), minus (iii) transaction expenses (for RONI and for NET Power), plus
(iv) all cash on the consolidated balance sheet of RONI and its subsidiaries, in the aggregate, exceeding $200,000,000 as of immediately
prior to the Closing. The Company filed a Current Reports on Form 8-K with
the U.S. Securities and Exchange Commission (the “SEC”) on December 13, 2022 including additional details, the Original Business
Combination Agreement, and related supporting agreements and filed a Current Report on Form 8-K with the SEC on April 24, 2023 including
the BCA Amendment and related details. For additional information regarding NET Power, the Proposed Business Combination and the transactions
contemplated thereby, see the registration statement on Form S-4 containing a proxy statement and a prospectus of RONI initially filed
with the SEC on December 22, 2022 and declared effective on May 10, 2023. Liquidity and Going Concern As of March 31, 2023, the Company had approximately
$0.8 million in its operating bank account and working capital deficit of approximately $4.8 million. The Company’s liquidity needs through March
31, 2023 have been satisfied through a payment of $25,000 from Sponsor to cover for certain expenses in exchange for the issuance of the
Founder Shares (as defined in Note 4), the loan of approximately $126,000 from the Sponsor pursuant to the Note (see Note 4), and the
proceeds from the consummation of the Private Placement not held in the Trust Account. The Company fully repaid the Note balance upon
closing of the Initial Public Offering. In addition, in order to finance transaction costs in connection with a Business Combination,
the Sponsor or an affiliate of the Sponsor, or certain of the Company’s officers and directors may, but are not obligated to, provide
the Company Working Capital Loans (see Note 4). As of March 31, 2023 and December 31, 2022, there were no amounts outstanding under any
Working Capital Loan. In connection with the Company’s
assessment of going concern considerations in accordance with FASB Accounting Standards Update (“ASU”) 2014-15,
“Disclosures of Uncertainties about an Entity’s Ability to Continue as a Going Concern,” management has determined
that the liquidity needs, mandatory liquidation and subsequent dissolution raises substantial doubt about the Company’s
ability to continue as a going concern. No adjustments have been made to the carrying amounts of assets or liabilities should the
Company be required to liquidate after June 18, 2023. The unaudited condensed consolidated financial statements do not include any
adjustment that might be necessary if the Company is unable to continue as a going concern. The Company intends to complete a
Business Combination before the mandatory liquidation date. Over this time period, the Company will be using these funds for paying
existing accounts payable, identifying and evaluating prospective initial Business Combination candidates, performing due diligence
on prospective target businesses, paying for travel expenditures, selecting the target business to merge with or acquire, and
structuring, negotiating and consummating the Business Combination. |
