Document:

EX-10.1

 Exhibit 10.1 

_____________, 2021 
 AltEnergy
Acquisition Corp. 
 600 Lexington Avenue, 9th Floor 

New York, NY 10022 
 Re: Initial Public Offering
 
 Ladies and Gentlemen: 
 This letter
(this “Letter Agreement”) is being delivered to you in accordance with the Underwriting Agreement (the “Underwriting Agreement”) to be entered into by and between AltEnergy Acquisition Corp., a
Delaware corporation (the “Company”), and B. Riley Securities, Inc. (“B. Riley”), as representative of the several underwriters named in Schedule A thereto (the “Underwriters”),
relating to an underwritten initial public offering (the “Public Offering”), of 20,000,000 of the Company’s units (plus up to an additional 3,000,000 units that may be purchased to cover over-allotments, if any) (each, a
“Unit”), each Unit comprised of one share of the Company’s Class A common stock, par value $0.0001 per share (the “Class A Common Stock”), and one-half of one redeemable warrant (each, a “Warrant”). Each whole Warrant entitles the holder thereof to purchase one share of Class A Common Stock at a price of $11.50 per share,
subject to adjustment. The Units shall be sold in the Public Offering pursuant to a registration statement on Form S-1 and prospectus (the “Prospectus”) filed by the Company with the
Securities and Exchange Commission (the “Commission”) and the Company shall apply to have the Units listed on the Nasdaq Capital Market. Certain capitalized terms used herein are defined in paragraph 10 hereof. 

In order to induce the Company and the Underwriters to enter into the Underwriting Agreement and to proceed with the Public Offering and for
other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, AltEnergy Acquisition Sponsor, LLC (the “Sponsor”), B. Riley Securities, Inc. and each of the other Initial Stockholders,
and each of the undersigned individuals, each of whom is a member of the Company’s board of directors and/or management team (each such other undersigned individual, an “Insider” and collectively, the
“Insiders”), hereby agrees with the Company as follows: 
 1. The Sponsor, each Insider and each of the other Initial
Stockholders agrees that (a) if the Company seeks stockholder approval of a proposed Business Combination, then in connection with such proposed Business Combination, it, he or she shall (i) vote any shares of Common Stock owned by it, him
or her in favor of any proposed Business Combination and (ii) not redeem any shares of Common Stock owned by it, him or her in connection with such stockholder approval; and (b) if the Company engages in a tender offer in connection with a
proposed Business Combination, it, he or she shall not sell any shares of Common Stock to the Company in connection therewith. 
 2. The
Sponsor, each Insider and each of the other Initial Stockholders hereby agrees that in the event that the Company fails to consummate a Business Combination within 18 months from the date of the closing of the Public Offering (the latest such date
being referred to as the “Termination Date”), or such longer period approved by the Company’s stockholders in accordance with the Company’s amended and restated certificate of incorporation (the
“Certificate of Incorporation”), the Sponsor, each Insider and each of the other Initial Stockholders shall take all reasonable steps to cause the Company to (i) cease all operations except for the purpose of winding up,
(ii) as promptly as reasonably possible but not more than 10 business days thereafter, subject to lawfully available funds therefor, redeem 100% of the Class A Common Stock sold as part of the Units in the Public Offering (the
“Offering 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 its taxes (which interest shall be net of taxes payable and less up to $100,000 of interest to pay dissolution expenses), divided by the number of then outstanding Offering Shares, which
redemption will completely extinguish all Public Stockholders’ rights as stockholders (including the right to receive further liquidation distributions, if any), subject to applicable law, and (iii) as promptly as reasonably possible
following such redemption, subject to the approval of the Company’s remaining stockholders and the Company’s board of directors, dissolve and liquidate, subject in each case to the Company’s obligations under Delaware law to provide
for claims of creditors and other requirements of applicable law. The Sponsor, each Insider and each of the other Initial Stockholders agrees not to propose any 

 
amendment to the Certificate of Incorporation (A) to modify the substance or timing of the Company’s obligation to redeem 100% of the Offering Shares if the Company does not complete a
Business Combination by the Termination Date or (B) with respect to any other provision relating to stockholders’ rights or pre-Business Combination activity, unless the Company provides its Public
Stockholders with the opportunity to redeem their Offering Shares upon approval of any such amendment at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account,
including interest (which interest shall be net of taxes payable) earned on the funds in the Trust Account divided by the number of then outstanding Offering Shares. 

The Sponsor, each Insider and each of the other Initial Stockholders acknowledges that it, he or she has no right, title, interest or claim of
any kind in or to any monies held in the Trust Account or any other asset of the Company as a result of any liquidation of the Company with respect to the Founder Shares held by it, him or her, provided, that the foregoing waiver shall not apply
with respect to liquidating distributions from the Trust Account made in connection with any Offering Shares purchased by the undersigned or its affiliates during the Public Offering or on the open market after the completion of the Public Offering
if the Company fails to complete a Business Combination by the Termination Date. The Sponsor, each Insider and each of the other Initial Stockholders hereby further waives, with respect to any shares of Common Stock held by it, him or her, if any,
any redemption rights it, he or she may have in connection with the consummation of a Business Combination, including, without limitation, any such rights available in the context of a stockholder vote to approve such Business Combination or in the
context of a tender offer made by the Company to purchase shares of Common Stock (although the Sponsor, the Insiders, the other Initial Stockholders and their respective affiliates shall be entitled to redemption and liquidation rights with respect
to any Offering Shares it or they hold if the Company fails to consummate a Business Combination by the Termination Date). 
 3.
Notwithstanding the provisions set forth in paragraphs 6(a) and (b) below, during the period commencing on the effective date of the Underwriting Agreement and ending 180 days after such date, the Sponsor, each Insider and each of the other
Initial Stockholders shall not, without the prior written consent of B. Riley, (i) offer, sell, contract to sell, hypothecate, pledge or grant any option to purchase or otherwise dispose of (or enter into any transaction that is designed to, or
might reasonably be expected to, result in the disposition (whether by actual disposition or effective economic disposition due to cash settlement or otherwise)), directly or indirectly, or establish or increase a put equivalent position or
liquidate or decrease a call equivalent position within the meaning of Section 16 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and the rules and regulations of the Commission promulgated
thereunder, with respect to, any Units, shares of Common Stock, Warrants or any securities convertible into, or exercisable, or exchangeable for, Common Stock, (ii) enter into any swap or other arrangement that transfers to another, in whole or
in part, any of the economic consequences of ownership of any Units, shares of Common Stock, Warrants or any securities convertible into, or exercisable, or exchangeable for, shares of Common Stock owned by it, him or her, whether any such
transaction is to be settled by delivery of such securities, in cash or otherwise, or (iii) publicly announce an intention to effect any such transaction. The provisions of this paragraph will not apply if (i) the release or waiver is
effected solely to permit a transfer of securities that is not for consideration and (ii) the transferee has agreed in writing to be bound by the same terms described in this Letter Agreement to the extent and for the duration that such terms
remain in effect at the time of the transfer. 
 4. In the event of the liquidation of the Trust Account, the Sponsor (which for purposes of
clarification shall not extend to any other members or managers of the Sponsor) agrees to indemnify and hold harmless the Company against any and all loss, liability, claim, damage and expense whatsoever (including, but not limited to, any and all
legal or other expenses reasonably incurred in investigating, preparing or defending against any litigation, whether pending or threatened, or any claim whatsoever) to which the Company may become subject as a result of any claim by (i) any
third party (other than the Company’s independent accountants) for services rendered or products sold to the Company or (ii) a prospective target business with which the Company has discussed entering into a transaction agreement (a
“Target”); provided, however, that such indemnification of the Company by the Sponsor shall apply only to the extent necessary to ensure that such claims by a third party for services rendered (other than the
Company’s independent public accountants) or products sold to the Company or a Target do not reduce the amount of funds in the Trust Account to below (i) $10.00 per share of the Offering Shares or (ii) such lesser amount per share of the
Offering Shares held in the Trust Account due to reductions in the value of the trust assets as of the date of the liquidation of the Trust Account, in each case, net of the amount of interest earned on the property in the Trust Account

  
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which may be withdrawn to pay taxes (less up to $100,000 of interest to pay dissolution expenses), except as to any claims by a third party (including a Target) who executed a waiver of any and
all rights to seek access to the Trust Account and except as to any claims under the Company’s indemnity of the Underwriters against certain liabilities, including liabilities under the Securities Act of 1933, as amended. In the event that any
such executed waiver is deemed to be unenforceable against such third party, the Sponsor shall not be responsible to the extent of any liability for such third party claims. The Sponsor shall have the right to defend against any such claim with
counsel of its choice reasonably satisfactory to the Company if, within 15 days following written receipt of notice of the claim to the Sponsor, the Sponsor notifies the Company in writing that it shall undertake such defense. 

5. The Sponsor, each Insider and each of the other Initial Stockholders hereby agrees and acknowledges that: (i) the Underwriters and the
Company would be irreparably injured in the event of a breach by such Sponsor, any Insider or any other Initial Stockholder of its, his or her obligations under paragraphs 1, 2, 3, 4, 6(a), 6(b), and 8 of this Letter Agreement (ii) monetary
damages may not be an adequate remedy for such breach and (iii) the non-breaching party shall be entitled to injunctive relief, in addition to any other remedy that such party may have in law or in
equity, in the event of such breach. 
 6. (a) The Sponsor, each Insider and each of the other Initial Stockholders agrees that it, he or she
shall not Transfer any Founder Shares (or any shares of Class A Common Stock issuable upon the conversion thereof) until the earlier of (A) one year after the completion of the Company’s initial Business Combination and
(B) subsequent to the Business Combination, (x) if the last reported sale price of the Common Stock equals or exceeds $12.00 per share (as adjusted for stock splits, stock dividends, reorganizations, recapitalizations and the like) for any
20 trading days within any 30-trading day period commencing at least 150 days after the Company’s initial Business Combination or (y) the date on which the Company completes a liquidation, merger,
capital stock exchange, reorganization or other similar transaction that results in all of the Company’s stockholders having the right to exchange their shares of Common Stock for cash, securities or other property (the “Founder
Shares Lock-Up Period”). 
 (b) Notwithstanding the provisions set forth in paragraph
6(a), Transfers of Founder Shares (or any shares of Class A Common Stock issuable upon the conversion thereof) that are held by the Sponsor, any Insider, any other Initial Stockholder or any of their permitted transferees (that have complied
with this paragraph 6(b)), are permitted (i) to the Company’s officers or directors, any affiliates or family members of any of the Company’s officers or directors, any members of the Sponsor, or any affiliates of the Sponsor, as well
as affiliates of such members and funds and accounts advised by such members; (ii) in the case of an individual, by gift to a member of the individual’s immediate family or to a trust, the beneficiary of which is a member of the
individual’s immediate family, an affiliate of such person or to a charitable organization; (iii) in the case of an individual, by virtue of laws of descent and distribution upon death of the individual; (iv) in the case of an
individual, pursuant to a qualified domestic relations order; (v) by private sales or transfers made in connection with any forward purchase agreement or similar arrangement or in connection with the consummation of an initial Business
Combination at prices no greater than the price at which the shares or warrants were originally purchased; (vi) in the event of the Company’s liquidation prior to the completion of the Company’s initial Business Combination;
(vii) by virtue of the laws of the State of Delaware or the Sponsor’s limited liability company agreement upon dissolution of the Sponsor or any other Initial Stockholder; (viii) in the event of the Company’s liquidation, merger
capital stock exchange, reorganization or other similar transaction which results in all of the Company’s stockholders having the right to exchange their shares of Common Stock for cash, securities or other property subsequent to the completion
of the Company’s initial Business Combination; or (ix) in the case of any Initial Stockholder that is, or is affiliated with, an Underwriter, to such Initial Stockholder’s affiliates or any entity controlled by such Initial
Stockholder, provided, however, that in the case of clauses (i) through (v), (vii) or (ix), these permitted transferees must enter into a written agreement agreeing to be bound by these transfer restrictions and the other
restrictions contained herein. 
 7. The Sponsor and each Insider represents and warrants that it, he or she has never been suspended or
expelled from membership in any securities or commodities exchange or association or had a securities or commodities license or registration denied, suspended or revoked. Each Insider’s biographical information furnished to the Company
(including any such information included in the Prospectus) is true and accurate in all respects and does not omit any material information with respect to the Insider’s background. The Sponsor and each Insider’s

  
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questionnaire furnished to the Company is true and accurate in all respects. The Sponsor and each Insider represents and warrants that: it, he or she is not subject to or a respondent in any
legal action for, any injunction, cease-and-desist order or order or stipulation to desist or refrain from any act or practice relating to the offering of securities in
any jurisdiction; it, he or she has never been convicted of, or pleaded guilty to, any crime (i) involving fraud, (ii) relating to any financial transaction or handling of funds of another person, or (iii) pertaining to any dealings
in any securities and it, he or she is not currently a defendant in any such criminal proceeding. 
 8. Except as disclosed in the
Prospectus, neither the Sponsor nor any Insider nor any affiliate of the Sponsor or any Insider, nor any director or officer of the Company, shall receive from the Company any finder’s fee, reimbursement, consulting fee, monies in respect of
any repayment of a loan or other compensation prior to, or in connection with any services rendered in order to effectuate the consummation of the Company’s initial Business Combination (regardless of the type of transaction that it is), other
than the amounts described in the Prospectus under the heading “Summary – The Offering – Limited Payments to Insiders”. 

9. The Sponsor, each Insider and each of the other Initial Stockholders has full right and power, without violating any agreement to which it
is bound (including, without limitation, any non-competition or non-solicitation agreement with any employer or former employer), to enter into this Letter Agreement
and, as applicable, to serve as an officer and/or a director on the board of directors of the Company and hereby consents to being named in the Prospectus as an officer and/or a director of the Company. 

10. As used herein, (i) “Business Combination” shall mean a merger, share exchange, asset acquisition, stock purchase,
reorganization, recapitalization or other similar business combination, involving the Company and one or more businesses; (ii) “Class B Common Stock” shall mean the Company’s Class B
common stock, par value $0.0001 per share; (iii) “Common Stock” shall mean the Class A Common Stock and the Class B Common Stock, collectively; (iv) “Founder Shares” shall mean the 5,750,000
shares (or 5,000,000 shares if the Underwriters’ option to purchase additional units is not exercised) of Class B Common Stock initially held by the Initial Stockholders; (v) “Initial Stockholders” shall mean the
Sponsor, B. Riley and any other holder of Founder Shares immediately prior to the Public Offering; (vi) “Private Placement Warrants” shall mean the warrants that the Sponsor and the Underwriters have agreed to purchase for an
aggregate purchase price of $10,800,000 (or $12,000,000 if the Underwriters’ option to purchase additional units is exercised in full), or $10.00 per warrant, in a private placement that shall occur simultaneously with the consummation of the
Public Offering; (vii) “Public Stockholders” shall mean the holders of securities issued in the Public Offering; (viii) “Trust Account” shall mean the trust fund into which a portion of the net
proceeds of the Public Offering shall be deposited; and (ix) “Transfer” shall mean the (a) sale or assignment of, offer to sell, contract or agreement to sell, hypothecate, pledge, grant of any option to purchase or
otherwise dispose of or agreement to dispose of, directly or indirectly, or establishment or increase of a put equivalent position or liquidation with respect to or decrease of a call equivalent position within the meaning of Section 16 of the
Exchange Act and the rules and regulations of the Commission promulgated thereunder with respect to, any security, (b) entry into any swap or other arrangement that transfers to another, in whole or in part, any of the economic consequences of
ownership of any security, whether any such transaction is to be settled by delivery of such securities, in cash or otherwise, or (c) public announcement of any intention to effect any transaction specified in clause (a) or (b). 

11. This Letter Agreement constitutes the entire agreement and understanding of the parties hereto in respect of the subject matter hereof and
supersedes all prior understandings, agreements, or representations by or among the parties hereto, written or oral, to the extent they relate in any way to the subject matter hereof or the transactions contemplated hereby. This Letter Agreement may
not be changed, amended, modified or waived (other than to correct a typographical error) as to any particular provision, except by a written instrument executed by the Company, the Sponsor, any Insider and each of the other Initial Stockholders
that is subject of any such change, amendment, modification or waiver. 
 12. No party hereto may assign either this Letter Agreement or any
of its rights, interests, or obligations hereunder without the prior written consent of the other parties. Any purported assignment in violation of this paragraph shall be void and ineffectual and shall not operate to transfer or assign any interest
or title to the purported assignee. This Letter Agreement shall be binding on the Sponsor, each Insider, each of the other Initial Stockholders and their respective successors, heirs and assigns and permitted transferees. 

  
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 13. Nothing in this Letter Agreement shall be construed to confer upon, or give to, any
person or corporation other than the parties hereto any right, remedy or claim under or by reason of this Letter Agreement or of any covenant, condition, stipulation, promise or agreement hereof. All covenants, conditions, stipulations, promises and
agreements contained in this Letter Agreement shall be for the sole and exclusive benefit of the parties hereto and their successors, heirs, personal representatives and assigns and permitted transferees; provided, however, that the
Underwriters shall benefit from the provisions set forth in paragraphs 3 and 6, which such paragraphs shall not be amended or modified without the written consent of B. Riley. 

14. This Letter Agreement may be executed in any number of original or facsimile counterparts and each of such counterparts shall for all
purposes be deemed to be an original, and all such counterparts shall together constitute but one and the same instrument. 
 15. This Letter
Agreement shall be deemed severable, and the invalidity or unenforceability of any term or provision hereof shall not affect the validity or enforceability of this Letter Agreement or of any other term or provision hereof. Furthermore, in lieu of
any such invalid or unenforceable term or provision, the parties hereto intend that there shall be added as a part of this Letter Agreement a provision as similar in terms to such invalid or unenforceable provision as may be possible and be valid
and enforceable. 
 16. This Letter Agreement shall be governed by and construed and enforced in accordance with the laws of the State of New
York, without giving effect to conflicts of law principles that would result in the application of the substantive laws of another jurisdiction. The parties hereto (i) all agree that any action, proceeding, claim or dispute arising out of, or
relating in any way to, this Letter Agreement shall be brought and enforced in the U.S. federal and New York state courts in the Borough of Manhattan in the City of New York, and irrevocably submit to such jurisdiction and venue, which jurisdiction
and venue shall be exclusive and (ii) waive any objection to such exclusive jurisdiction and venue or that such courts represent an inconvenient forum. 

17. Any notice, consent or request to be given in connection with any of the terms or provisions of this Letter Agreement shall be in writing
and shall be sent by express mail or similar private courier service, by certified mail (return receipt requested), by hand delivery or facsimile transmission. 

18. This Letter Agreement shall terminate on the earlier of (i) the expiration of the Founder Shares
Lock-Up Period or (ii) the liquidation of the Company; provided, however, that this Letter Agreement shall earlier terminate in the event that the Public Offering is not consummated and
closed by ______________, 2021; provided further that paragraph 4 of this Letter Agreement shall survive such liquidation. 

[Signature Page Follows] 

  
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	Sincerely,
	
	ALTENERGY ACQUISTION SPONSOR, LLC
		
	By:	 	  

	Name: 
	Title: 
	
	B. RILEY SECURITIES, INC.
		
	By:	 	  

	Name:
	Title:

 [Signature Page to Letter Agreement] 

			
	Acknowledged and Agreed:
	
	ALTENERGY ACQUISITION CORP.
		
	By:	 	  

	Name: 
	Title: 

 [Signature Page to Letter Agreement]EX-10.2

 Exhibit 10.2 

INVESTMENT MANAGEMENT TRUST AGREEMENT 

This Investment Management Trust Agreement (this “Agreement”) is made effective as of
                , 2021, by and between AltEnergy Acquisition Corp., a Delaware corporation (the “Company”), and Continental Stock
Transfer & Trust Company, a New York limited purpose trust company (the “Trustee”). 
 WHEREAS, the
Company’s registration statement on Form S-1, File No. 333-258594 (the “Registration Statement”) and prospectus (the
“Prospectus”) for the initial public offering of the Company’s units (the “Units”), each of which consists of one share of the Company’s Class A common stock, par value $0.0001 per share
(the “Common Stock”), and one-half of one redeemable warrant, each whole warrant entitling the holder thereof to purchase one share of Common Stock (such initial public offering
hereinafter referred to as the “Offering”), has been declared effective as of the date hereof (the “Effective Date”) by the U.S. Securities and Exchange Commission (capitalized terms used herein and
not otherwise defined shall have the meanings set forth in the Registration Statement); 
 WHEREAS, the Company has entered into an
Underwriting Agreement (the “Underwriting Agreement”) with B. Riley Securities, Inc., as representative (the “Representative”) of the several underwriters (the “Underwriters”)
named therein; 
 WHEREAS, as described in the Prospectus, and in accordance with the Company’s amended and restated certificate of
incorporation, as the same may be amended from time to time (the “Charter”), $204,000,000 of the proceeds of the Offering and sale of the Private Placement Units (as defined in the Underwriting Agreement) (or $234,600,000, if
the Underwriters’ over-allotment option is exercised in full) will be delivered to the Trustee to be deposited and held in a segregated trust account located at all times in the United States (the “Trust Account”) for
the benefit of the Company and the holders of the Common Stock included in the Units issued in the Offering as hereinafter provided (the amount to be delivered to the Trustee (and any interest subsequently earned thereon) is referred to herein as
the “Property,” the stockholders for whose benefit the Trustee shall hold the Property will be referred to as the “Public Stockholders,” and the Public Stockholders and the Company will be referred to
together as the “Beneficiaries”); 
 WHEREAS, pursuant to the Underwriting Agreement, a portion of the Property
equal to $7,000,000, or $8,050,000 if the Underwriters’ over-allotment option is exercised in full, is attributable to deferred underwriting discounts and commissions that will be payable by the Company to the Underwriters upon and concurrently
with the consummation of the Business Combination (as defined below) (the “Deferred Discount”); and 
 WHEREAS, the
Company and the Trustee desire to enter into this Agreement to set forth the terms and conditions pursuant to which the Trustee shall hold the Property. 

NOW THEREFORE, IT IS AGREED: 
 1.
Agreements and Covenants of Trustee. The Trustee hereby agrees and covenants to: 
 (a) Hold the Property in trust for the
Beneficiaries in accordance with the terms of this Agreement in the Trust Account established by the Trustee in the United States at Morgan Stanley (or at another U.S.-chartered commercial bank with consolidated assets of $100 billion or more)
in the United States, maintained by the Trustee and at a brokerage institution selected by the Trustee that is reasonably satisfactory to the Company; 

 (b) Manage, supervise and administer the Trust Account subject to the terms and conditions
set forth herein; 
 (c) In a timely manner, upon the written instruction of the Company, invest and reinvest the Property solely in United
States government securities within the meaning of Section 2(a)(16) of the Investment Company Act of 1940, as amended, having a maturity of 185 days or less, or in money market funds meeting the conditions of paragraphs (d)(1), (d)(2), (d)(3)
and (d)(4) of Rule 2a-7 promulgated under the Investment Company Act of 1940, as amended (or any successor rule), which invest only in direct U.S. government treasury obligations, as determined by the Company;
the trustee may not invest in any other securities or assets, it being understood that the Trust Account will earn no interest while account funds are uninvested awaiting the Company’s instructions hereunder and the Trustee may earn bank
credits or other consideration during such periods; 
 (d) Collect and receive, when due, all principal, interest or other income arising
from the Property, which shall become part of the “Property,” as such term is used herein; 
 (e) Promptly notify the
Company and the Representative of all communications received by the Trustee with respect to any Property requiring action by the Company; 

(f) Supply any necessary information or documents as may be requested by the Company (or its authorized agents) in connection with the
Company’s preparation of the tax returns relating to assets held in the Trust Account; 
 (g) Participate in any plan or proceeding for
protecting or enforcing any right or interest arising from the Property if, as and when instructed by the Company to do so; 
 (h) Render to
the Company monthly written statements of the activities of, and amounts in, the Trust Account reflecting all receipts and disbursements of the Trust Account; 

(i) Commence liquidation of the Trust Account only after and promptly after (x) receipt of, and only in accordance with, the terms of a
letter from the Company (“Termination Letter”) in a form substantially similar to that attached hereto as either Exhibit A or Exhibit B, as applicable, signed on behalf of the Company by its Chief Executive Officer, Chief
Financial Officer, President, Executive Vice President, Vice President, Secretary or Chairman of the board of directors of the Company (the “Board”) or other authorized officer of the Company, and, in the case of Exhibit A,
acknowledged and agreed to by the Representative, and complete the liquidation of the Trust Account and distribute the Property in the Trust Account, including interest not previously released to the Company to pay its tax obligations (less up to
$100,000 of interest that may be released to the Company to pay dissolution expenses), only as directed in the Termination Letter and the other documents referred to therein, or (y) upon the date which is, the later of (1) 18 months
after the closing of the Offering and (2) such later date as may be approved by the Company’s stockholders in accordance with the Charter if a Termination Letter has not been received by the Trustee prior to such date, in which case the
Trust Account shall be liquidated in accordance with the procedures set forth in the Termination Letter attached as Exhibit B and the Property in the Trust Account, including interest not previously released to the Company to pay its tax obligations
(less up to $100,000 of interest that may be released to the Company to pay dissolution expenses) shall be distributed to the Public Stockholders of record as of such date; provided, however, that the Trustee has no obligation to monitor or question
the Company’s position that an allocation has been made for taxes payable; 

  
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 (j) Upon written request from the Company, which may be given from time to time in a form
substantially similar to that attached hereto as Exhibit C, withdraw from the Trust Account and distribute to the Company the amount of interest earned on the Property requested by the Company to cover any tax obligation, including any franchise tax
obligations, owed by the Company as a result of assets of the Company or interest or other income earned on the Property, which amount shall be delivered directly to the Company by electronic funds transfer or other method of prompt payment, and the
Company shall forward such payment to the relevant taxing authority, as applicable; provided, however, that to the extent there is not sufficient cash in the Trust Account to pay such tax obligation, the Trustee shall liquidate such assets held in
the Trust Account as shall be designated by the Company in writing to make such distribution, so long as there is no reduction in the principal amount per share initially deposited in the Trust Account; provided, further, that if the tax to be paid
is a franchise tax, the written request by the Company to make such distribution shall be accompanied by a copy of the franchise tax bill from the State of Delaware for the Company and a written statement from the principal financial officer of the
Company setting forth the actual amount payable (it being acknowledged and agreed that any such amount in excess of interest income earned on the Property shall not be payable from the Trust Account). The written request of the Company referenced
above shall constitute presumptive evidence that the Company is entitled to said funds, and the Trustee shall have no responsibility to look beyond said request; 

(k) Upon written request from the Company, which may be given from time to time in a form substantially similar to that attached hereto as
Exhibit D, the Trustee shall distribute to the remitting brokers on behalf of Public Stockholders redeeming shares of Common Stock the amount required to pay redeemed shares of Common Stock from Public Stockholders; and 

(l) Not make any withdrawals or distributions from the Trust Account other than pursuant to Sections 1(i), 1(j) or 1(k) above. 

2. Agreements and Covenants of the Company. The Company hereby agrees and covenants to: 

(a) Give all instructions to the Trustee hereunder in writing, signed by the Company’s Chairman of the Board, Chief Executive Officer,
Chief Financial Officer, President, Executive Vice President, Vice President or Secretary. In addition, except with respect to its duties under Sections 1(i), 1(j) and 1(k) hereof, the Trustee shall be entitled to rely on, and shall be protected in
relying on, any verbal or telephonic advice or instruction which it, in good faith and with reasonable care, believes to be given by any one of the persons authorized above to give written instructions, provided that the Company shall promptly
confirm such instructions in writing; 
 (b) Subject to Section 4 hereof, hold the Trustee harmless and indemnify the Trustee from and
against any and all expenses, including reasonable counsel fees and disbursements, or losses suffered by the Trustee in connection with any action taken by it hereunder and in connection with any action, suit or other proceeding brought against the
Trustee involving any claim, or in connection with any claim or demand, which in any way arises out of or relates to this Agreement, the services of the Trustee hereunder, or the Property or any interest earned on the Property, except for expenses
and losses resulting from the Trustee’s gross negligence, fraud or willful misconduct. Promptly after the receipt by the Trustee of notice of demand or claim or the commencement of any action, suit or proceeding, pursuant to which the Trustee
intends to seek indemnification under this Section 2(b), it shall notify the Company in writing of such claim (hereinafter referred to as the “Indemnified Claim”). The Trustee shall have the right to conduct

  
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and manage the defense against such Indemnified Claim; provided that the Trustee shall obtain the consent of the Company with respect to the selection of counsel, which consent shall not be
unreasonably withheld. The Trustee may not agree to settle any Indemnified Claim without the prior written consent of the Company, which such consent shall not be unreasonably withheld. The Company may participate in such action with its own
counsel; 
 (c) Pay the Trustee the fees set forth on Schedule A hereto, including an initial acceptance fee, annual administration fee, and
transaction processing fee which fees shall be subject to modification by the parties from time to time. It is expressly understood that the Property shall not be used to pay such fees unless the disbursements are made to the Company pursuant to
Section 1(i) solely in connection with the completion of a Business Combination (defined below). The Company shall pay the Trustee the initial acceptance fee and the first annual administration fee at the consummation of the Offering and
thereafter on the anniversary of the Effective Date. The Trustee shall refund the Company the annual administration fee (on a pro rata basis) with respect to any period after the liquidation of the Trust Account. The Company shall not be responsible
for any other fees or charges of the Trustee except as set forth in this Section 2(c), Schedule A and as may be provided in Section 2(b) hereof; 

(d) In connection with any vote of the Company’s stockholders regarding a merger, capital stock exchange, asset acquisition, stock
purchase, reorganization or similar business combination involving the Company and one or more businesses (the “Business Combination”), provide to the Trustee an affidavit or certificate of the inspector of elections for the
stockholder meeting (which inspector of elections may be the Trustee) verifying the vote of such stockholders regarding such Business Combination; 

(e) Provide the Representative with a copy of any Termination Letter(s) and/or any other correspondence that is sent to the Trustee with
respect to any proposed withdrawal from the Trust Account promptly after it issues the same; 
 (f) Unless otherwise agreed between the
Company and the Representative, ensure that any Instruction Letter (as defined in Exhibit A) delivered in connection with a Termination Letter in the form of Exhibit A expressly provides that the Deferred Discount is paid directly to the account or
accounts directed by the Representative on behalf of the Underwriters prior to any transfer of the funds held in the Trust Account to the Company or any other person; 

(g) In connection with the Trustee acting as Paying/Disbursing Agent pursuant to Exhibit B, the Company will not give the Trustee
disbursement instructions which would be prohibited under this Agreement; 
 (h) In the event the Company is entitled to receive a tax refund
on its tax obligation, and promptly after the amount of such refund is determined on a final basis, provide the Trustee with notice in writing (with a copy to the Representative) of the amount of such tax refund; 

(i) If the Company seeks to amend any provisions of its Charter that would affect the substance or timing of the Company’s Public
Stockholders’ ability to convert or sell their shares to the Company in connection with a Business Combination or with respect to any other provisions relating to the rights of holders of the Common Stock, (in each case, an
“Amendment”), the Company will provide the Trustee with a letter (an “Amendment Notification Letter”) in the form of Exhibit D providing instructions for the distribution of funds to Public
Stockholders who exercise their conversion option in connection with such Amendment; and 

  
 4 

 (j) Within five (5) business days after the Representative, on behalf of the
Underwriters, exercise the over-allotment option (or any unexercised portion thereof) or such over-allotment option expires, provide the Trustee with a notice in writing (with a copy to the Representative) of the total amount of the Deferred
Discount. 
 3. Limitations of Liability. The Trustee shall have no responsibility or liability to: 

(a) Take any action with respect to the Property, other than as directed in Section 1 hereof, and the Trustee shall have no liability to
any third party except for liability arising out of the Trustee’s gross negligence, fraud or willful misconduct; 
 (b) Institute any
proceeding for the collection of any principal and income arising from, or institute, appear in or defend any proceeding of any kind with respect to, any of the Property unless and until it shall have received instructions from the Company given as
provided herein to do so and the Company shall have advanced or guaranteed to it funds sufficient to pay any expenses incident thereto; 

(c) Change the investment of any Property, other than in compliance with Section 1 hereof; 

(d) Refund any depreciation in principal of any Property; 

(e) Assume that the authority of any person designated by the Company to give instructions hereunder shall not be continuing unless provided
otherwise in such designation, or unless the Company shall have delivered a written revocation of such authority to the Trustee; 
 (f) The
other parties hereto or to anyone else for any action taken or omitted by it, or any action suffered by it to be taken or omitted, in good faith and in the Trustee’s best judgment, except for the Trustee’s gross negligence, fraud or
willful misconduct. The Trustee may rely conclusively and shall be protected in acting upon any order, notice, demand, certificate, opinion or advice of counsel (including counsel chosen by the Trustee, which counsel may be the Company’s
counsel), statement, instrument, report or other paper or document (not only as to its due execution and the validity and effectiveness of its provisions, but also as to the truth and acceptability of any information therein contained) which the
Trustee believes, in good faith and with reasonable care, to be genuine and to be signed or presented by the proper person or persons. The Trustee shall not be bound by any notice or demand, or any waiver, modification, termination or rescission of
this Agreement or any of the terms hereof, unless evidenced by a written instrument delivered to the Trustee, signed by the proper party or parties and, if the duties or rights of the Trustee are affected, unless it shall give its prior written
consent thereto; 
 (g) Verify the accuracy of the information contained in the Registration Statement; 

(h) File local, state and/or federal tax returns or information returns with any taxing authority on behalf of the Trust Account and payee
statements with the Company documenting the taxes, if any, payable by the Company or the Trust Account, relating to the income earned on the Property; 

(i) Pay any taxes on behalf of the Trust Account (it being expressly understood that the Property shall not be used to pay any such taxes and
that such taxes, if any, shall be paid by the Company from funds not held in the Trust Account, except in accordance with Section 1(j)); 

(j) Imply obligations, perform duties, inquire or otherwise be subject to the provisions of any agreement or document other than this agreement
and that which is expressly set forth herein; or 

  
 5 

 (k) Verify calculations, qualify or otherwise approve the Company’s written requests
for distributions pursuant to Sections 1(i), 1(j) or 1(k) hereof. 
 4. Trust Account Waiver. The Trustee has no right of set-off or any right, title, interest or claim of any kind (“Claim”) to, or to any monies in, the Trust Account, and hereby irrevocably waives any Claim to, or to any monies in, the Trust
Account that it may have now or in the future. In the event the Trustee has any Claim against the Company under this Agreement, including, without limitation, under Section 2(b) or Section 2(c) hereof, the Trustee shall pursue such Claim
solely against the Company and its assets outside the Trust Account and not against the Property or any monies in the Trust Account. 
 5.
Termination. This Agreement shall terminate as follows: 
 (a) If the Trustee gives written notice to the Company that it desires to
resign under this Agreement, the Company shall use its reasonable efforts to locate a successor trustee, pending which the Trustee shall continue to act in accordance with this Agreement. At such time that the Company notifies the Trustee that a
successor trustee has been appointed by the Company and has agreed to become subject to the terms of this Agreement, the Trustee shall transfer the management of the Trust Account to the successor trustee, including but not limited to the transfer
of copies of the reports and statements relating to the Trust Account, whereupon this Agreement shall terminate; provided, however, that in the event that the Company does not locate a successor trustee within ninety (90) days of receipt of the
resignation notice from the Trustee, the Trustee may submit an application to have the Property deposited with any court in the State of New York or with the United States District Court for the Southern District of New York and upon such deposit,
the Trustee shall be immune from any liability whatsoever; or 
 (b) At such time that the Trustee has completed the liquidation of the Trust
Account and its obligations in accordance with the provisions of Section 1(i) hereof (which section may not be amended under any circumstances) and distributed the Property in accordance with the provisions of the Termination Letter, this
Agreement shall terminate except with respect to Section 2(b) and Section 4. 
 6. Miscellaneous. 

(a) The Company and the Trustee each acknowledge that the Trustee will follow the security procedures set forth below with respect to funds
transferred from the Trust Account. The Company and the Trustee will each restrict access to confidential information relating to such security procedures to authorized persons. Each party must notify the other party immediately if it has reason to
believe unauthorized persons may have obtained access to such confidential information, or of any change in its authorized personnel. In executing funds transfers, the Trustee shall rely upon all information supplied to it by the Company, including,
account names, account numbers, and all other identifying information relating to a Beneficiary, Beneficiary’s bank or intermediary bank. Except for any liability arising out of the Trustee’s gross negligence, fraud or willful misconduct,
the Trustee shall not be liable for any loss, liability or expense resulting from any error in the information or transmission of the funds. 

(b) This Agreement shall be governed by and construed and enforced in accordance with the laws of the State of New York, without giving effect
to conflicts of law principles that would result in the application of the substantive laws of another jurisdiction. This Agreement may be executed in several original or facsimile counterparts, each one of which shall constitute an original, and
together shall constitute but one instrument. 
 (c) This Agreement contains the entire agreement and understanding of the parties hereto
with respect to the subject matter hereof. This Agreement or any provision hereof may only be changed, amended or modified (other than to correct a typographical error) by a writing signed by each of the parties hereto. 

  
 6 

 (d) This Agreement or any provision hereof may only be changed, amended or modified pursuant
to Section 6(c) hereof with the Consent of the Stockholders. For purposes of this Section 6(d), the “Consent of the Stockholders” means (i) receipt by the Trustee of a certificate from the inspector of
elections of the stockholder meeting certifying that the Company’s stockholders of record as of a record date established in accordance with Section 213(a) of the Delaware General Corporation Law, as amended (or any successor rule), who
hold sixty-five percent (65%) or more of all then outstanding shares of the Common Stock and Class B common stock, par value $0.0001 per share, of the Company voting together as a single class, have voted in favor of such change, amendment or
modification, or (ii) the Company’s stockholders of record as of the record date who hold sixty-five percent (65%) or more of all then outstanding shares of the Common Stock and Class B common stock, par value $0.0001 per share, of
the Company voting together as a single class, have delivered to the Trustee a signed writing approving such change, amendment or modification. No such amendment will affect any Public Stockholder who has otherwise indicated his, her or its election
to redeem his, her or its shares of Common Stock in connection with a stockholder vote sought to amend this Agreement, including a corresponding change to the Charter. Except for any liability arising out of the Trustee’s gross negligence,
fraud or willful misconduct, the Trustee may rely conclusively on the certification from the inspector or elections referenced above and shall be relieved of all liability to any party for executing the proposed amendment in reliance thereon. 

(e) The parties hereto consent to the jurisdiction and venue of any state or federal court located in the City of New York, State of New York,
for purposes of resolving any disputes hereunder. AS TO ANY CLAIM, CROSS-CLAIM OR COUNTERCLAIM IN ANY WAY RELATING TO THIS AGREEMENT, EACH PARTY WAIVES THE RIGHT TO TRIAL BY JURY. 

(f) Any notice, consent or request to be given in connection with any of the terms or provisions of this Agreement shall be in writing and
shall be sent by express mail or similar private courier service, by certified mail (return receipt requested), by hand delivery or by electronic mail: 

if to the Trustee, to: 

Continental Stock Transfer & Trust Company 

1 State Street, 30th Floor 

New York, NY 10004 

Attn: Francis Wolf 

Email: fwolf@continentalstock.com 

if to the Company, to: 

AltEnergy Acquisition Corp. 

600 Lexington Avenue, 9th Floor 

New York, NY 10022 

Attn: Russell Stidolph 

Email: rstidolph@altenergyllc.com 

  
 7 

 in each case, with copies to: 

Morrison Cohen, LLP 

909 Third Avenue 

New York, NY 10022 

Attn: Jack Levy, Esq. and Anthony M. Saur, Esq. 

Email: jacklevy@morrisoncohen.com and amsaur@morrisoncohen.com 

and: 
 B. Riley
Securities, Inc. 
 299 Park Avenue, 21st Floor 

New York, New York 10017 

Attn: [_] 

Email: [_] 
 and:

 Paul Hastings LLP 

515 South Flower Street, 25th Floor 

Los Angeles, CA 90071 

Attn: Jonathan Ko, Esq. 

Email: jonathanko@paulhastings.com 

(g) Each of the Company and the Trustee hereby represents that it has the full right and power and has been duly authorized to enter into this
Agreement and to perform its respective obligations as contemplated hereunder. The Trustee acknowledges and agrees that it shall not make any claims or proceed against the Trust Account, including by way of
set-off, and shall not be entitled to any funds in the Trust Account under any circumstance. 
 (h)
This Agreement is the joint product of the Trustee and the Company and each provision hereof has been subject to the mutual consultation, negotiation and agreement of such parties and shall not be construed for or against any party hereto. 

(i) This Agreement may be executed in any number of counterparts, each of which shall be deemed to be an original, but all such counterparts
shall together constitute one and the same instrument. Delivery of a signed counterpart of this Agreement by facsimile or electronic transmission shall constitute valid and sufficient delivery thereof. 

(j) Each of the Company and the Trustee hereby acknowledges and agrees that the Representative on behalf of the Underwriters are third party
beneficiaries of this Agreement. 
 (k) Except as specified herein, no party to this Agreement may assign its rights or delegate its
obligations hereunder to any other person or entity. 
 [Signature Page Follows] 

  
 8 

 IN WITNESS WHEREOF, the parties have duly executed this Investment Management Trust
Agreement as of the date first written above. 
  

			
	CONTINENTAL STOCK TRANSFER & TRUST COMPANY, as Trustee
		
	By:	 	              

	Name:
	Title:
	
	ALTENERGY ACQUISITION CORP.
		
	By:	 	
                 

	Name: 
	Title: 

 [Signature Page to Investment Management Trust Agreement] 

 SCHEDULE A 
  

							
	Fee Item	  	Time and method of payment	  	Amount	 
			
	Initial set-up fee	  	Initial closing of Offering by wire transfer	  	$	 3,500.00	 
			
	Trustee administration fee	  	First year, initial closing of Offering by wire transfer, thereafter on the anniversary of the effective date of the Offering by wire transfer or check	  	$ 	10,000.00	 
			
	Transaction processing fee for disbursements to Company under Sections 1(i), 1(j) and 1(k)	  	Billed to Company following disbursement made to Company under Sections 1(i), 1(j), and 1(k)	  	$	 250.00	 
			
	Paying Agent services as required pursuant to Sections 1(i) and 1(k)	  	Billed to Company upon delivery of service pursuant to Sections 1(i) and 1(k)	  	 	Prevailing rates	 

 EXHIBIT A 

[Letterhead of Company] 

[Insert date] 
 Continental Stock
Transfer & Trust Company 
 1 State Street, 30th Floor 

New York, New York 10004 
 Attn: [_] 

 

	 	Re:	 Trust Account - Termination Letter  

Dear [_]: 
 Pursuant to Section 1(i) of the
Investment Management Trust Agreement between AltEnergy Acquisition Corp. (the “Company”) and Continental Stock Transfer & Trust Company (the “Trustee”), dated as of [_], 2021 (the “Trust
Agreement”), this is to advise you that the Company has entered into an agreement with ____________ (the “Target Business”) to consummate a business combination with the Target Business (the
“Business Combination”) on or about [insert date]. The Company shall notify you at least seventy-two (72) hours in advance (or such shorter time as you may agree) of the actual
date of the consummation of the Business Combination (the “Consummation Date”). Capitalized terms used but not defined herein shall have the meanings set forth in the Trust Agreement. 

In accordance with the terms of the Trust Agreement, we hereby authorize you to commence to liquidate all of the assets of the Trust Account
and transfer the proceeds to a segregated account held by you on behalf of the Beneficiaries to the effect that, on the Consummation Date, all of the funds held in the Trust Account at Morgan Stanley will be immediately available for transfer to the
account or accounts that the Company shall direct on the Consummation Date (including as directed to it by the Representative on behalf of the Underwriters (with respect to the Deferred Discount)). It is acknowledged and agreed that while the funds
are on deposit in the Trust Account at Morgan Stanley awaiting distribution, the Company will not earn any interest or dividends. 
 On the
Consummation Date (i) counsel for the Company shall deliver to you written notification that the Business Combination has been consummated, or will be consummated substantially concurrently with your transfer of funds to the accounts as
directed by the Company (the “Notification”) and (ii) the Company shall deliver to you (a) a certificate of the Chief Executive Officer, which verifies that the Business Combination has been approved by a vote of
the Company’s stockholders, if a vote is held and (b) a joint written instruction signed by the Company and the Representative with respect to the transfer of the funds held in the Trust Account, including payment of amounts owed to public
stockholders who have properly exercised their redemption rights and payment of the Deferred Discount to account or accounts directed by the Representative from the Trust Account (the “Instruction Letter”). You are hereby
directed and authorized to transfer the funds held in the Trust Account immediately upon your receipt of the Notification and the Instruction Letter, in accordance with the terms of the Instruction Letter. In the event that certain deposits held in
the Trust Account may not be liquidated by the Consummation Date without penalty, you will notify the Company in writing of the same and the Company shall direct you as to whether such funds should remain in the Trust Account and be distributed
after the Consummation Date to the Company. Upon the distribution of all the funds, net of any payments necessary for reasonable unreimbursed expenses related to liquidating the Trust Account, your obligations under the Trust Agreement shall be
terminated. 

  
 A-1 

 In the event that the Business Combination is not consummated on the Consummation Date
described in the notice thereof and we have not notified you on or before the original Consummation Date of a new Consummation Date, then upon receipt by the Trustee of written instructions from the Company, the funds held in the Trust Account shall
be reinvested as provided in Section 1(c) of the Trust Agreement on the business day immediately following the Consummation Date as set forth in such notice as soon thereafter as possible. 

 

			
	Very truly yours,
	
	AltEnergy Acquisition Corp.
		
	By:	 	              

	Name:	 	
	Title:	 	

 Acknowledged and Agreed: 
  

			
	B. Riley Securities, Inc.
		
	By:	 	              

	Name:	 	
	Title:	 	

  
 A-2 

 EXHIBIT B 

[Letterhead of Company] 

[Insert date] 
 Continental Stock
Transfer & Trust Company 
 1 State Street, 30th Floor 

New York, New York 10004 
 Attn: [_] 

 

	 	Re:	 Trust Account - Termination Letter  

Dear [_]: 
 Pursuant to Section 1(i) of the
Investment Management Trust Agreement between AltEnergy Acquisition Corp. (the “Company”) and Continental Stock Transfer & Trust Company (the “Trustee”), dated as of [_], 2021 (the
“Trust Agreement”), this is to advise you that the Company did not effect a business combination with a Target Business (the “Business Combination”) within the time frame specified in the
Company’s Charter, as described in the Company’s Prospectus relating to the Offering. Capitalized terms used but not defined herein shall have the meanings set forth in the Trust Agreement. 

In accordance with the terms of the Trust Agreement, we hereby authorize you to liquidate all of the assets in the Trust Account and transfer
the total proceeds into a segregated account held by you on behalf of the Beneficiaries to await distribution to the 
 Public Stockholders.
The Company has selected [            , 20 ]1 as the effective date for the purpose of determining when the Public Stockholders
will be entitled to receive their share of the liquidation proceeds. You agree to be the Paying Agent of record and, in your separate capacity as Paying Agent, agree to distribute said funds directly to the Company’s Public Stockholders in
accordance with the terms of the Trust Agreement and the Company’s Charter. Upon the distribution of all the funds, net of any payments necessary for reasonable unreimbursed expenses related to liquidating the Trust Account, your obligations
under the Trust Agreement shall be terminated, except to the extent otherwise provided in Section 1(i) of the Trust Agreement. 
  

			
	Very truly yours,
	
	AltEnergy Acquisition Corp.
		
	By:	 	              

	Name: Russell Stidolph
	Title: Chief Executive Officer

  

	cc:	 B. Riley Securities, Inc. 

 

	1 	 1-18 months from the closing of the Offering, or at a later date, if
extended. 

  
 B-1 

 EXHIBIT C 

[Letterhead of Company] 

[Insert date] 
 Continental Stock
Transfer & Trust Company 
 1 State Street, 30th Floor 

New York, New York 10004 
 Attn: [_] 

 

	 	Re:	 Trust Account - Withdrawal Instruction  

Dear [_]: 
 Pursuant to Section 1(j) of the
Investment Management Trust Agreement between AltEnergy Acquisition Corp. (the “Company”) and Continental Stock Transfer & Trust Company (the “Trustee”), dated as of [_], 2021 (the
“Trust Agreement”), the Company hereby requests that you deliver to the Company $[ ] of the interest income earned on the Property as of the date hereof. Capitalized terms used but not defined herein shall have
the meanings set forth in the Trust Agreement. 
 The Company needs such funds [to pay for the tax obligations as set forth on the attached
tax return or tax statement]. In accordance with the terms of the Trust Agreement, you are hereby directed and authorized to transfer (via wire transfer) such funds promptly upon your receipt of this letter to the Company’s operating account
at: 
 [WIRE INSTRUCTION INFORMATION] 
  

			
	Very truly yours,
	
	AltEnergy Acquisition Corporation
		
	By:	 	              

	Name:	 	
	Title:	 	

  

	cc:	 B. Riley Securities, Inc. 

  
 C-1 

 EXHIBIT D 

[Letterhead of Company] 

[Insert date] 
 Continental Stock
Transfer & Trust Company 
 1 State Street, 30th Floor 

New York, New York 10004 
 Attn: [_] 

 

	 	Re:	 Trust Account - Stockholder Redemption Withdrawal Instruction  

Dear Mr. [_]: 
 Pursuant to
Section 1(k) of the Investment Management Trust Agreement between AltEnergy Acquisition Corp. (the “Company”) and Continental Stock Transfer & Trust Company (the “Trustee”), dated as of [_],
2021 (the “Trust Agreement”), the Company hereby requests that you deliver to the redeeming Public Stockholders of the Company $[        ] of the principal and interest
income earned on the Property as of the date hereof to a segregated account held by you on behalf of the Beneficiaries for distribution to the Public Stockholders who have requested redemption of their shares of Common Stock. Capitalized terms used
but not defined herein shall have the meanings set forth in the Trust Agreement. 
 The Company needs such funds to pay its Public
Stockholders who have properly elected to have their shares of Common Stock redeemed by the Company in connection with a stockholder vote to approve an amendment to the Company’s Charter to (i) modify the substance or timing of the
Company’s obligation to allow redemption in connection with a Business Combination or to redeem 100% of the shares of Common Stock included in the Units sold in the Offering if the Company does not complete a Business Combination within the
time period set forth in the Company’s Charter or (ii) with respect to any other provision relating to stockholders’ rights or pre-initial Business Combination activity. As such, you are hereby
directed and authorized to transfer (via wire transfer) such funds promptly upon your receipt of this letter. 
  

			
	Very truly yours,
	
	AltEnergy Acquisition Corp.
		
	By:	 	
                 

	Name:	 	
	Title:

  

	cc:	 Nomura Securities International, Inc. 

  
 D-1

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