EX-10.4





 Exhibit 10.4 

REGISTRATION RIGHTS AGREEMENT 

THIS REGISTRATION RIGHTS AGREEMENT (this “Agreement”), dated as of October 13, 2021, is made and entered into by
and among Black Mountain Acquisition Corp., a Delaware corporation (the “Company”), Black Mountain Sponsor LLC, a Delaware limited liability company (the “Sponsor”), and the undersigned parties listed
under Holders on the signature page hereto (each such party, together with the Sponsor and any person or entity who hereafter becomes a party to this Agreement pursuant to Section 5.2 of this Agreement, a
“Holder” and collectively the “Holders”). 
 RECITALS 

WHEREAS, the Sponsor, Mel G. Riggs, Charles W. Yates and Stephen Straty own an aggregate of 90,000 shares of the Company’s
Class B common stock, par value $0.0001 per share (the “Founder Shares”); 
 WHEREAS, the Founder Shares
will automatically convert into shares of the Company’s Class A common stock, par value $0.0001 per share (the “Common Stock”), at the time of the Company’s initial Business Combination (as defined below) on a one-for-one basis, subject to adjustment, on the terms and conditions provided in the Company’s amended and restated certificate of incorporation; 

WHEREAS, on October 13, 2021, the Company and the Sponsor entered into that certain Private Placement Warrants Purchase Agreement,
pursuant to which the Sponsor agreed to purchase 11,600,000 warrants (or 13,040,000 warrants if the over-allotment option in connection with the Company’s initial public offering is exercised in full)
(the “Private Placement Warrants”) in a private placement transaction occurring simultaneously with the closing of the Company’s initial public offering; and 

WHEREAS, the Company and the Holders desire to enter into this Agreement, pursuant to which the Company shall grant the Holders certain
registration rights with respect to certain securities of the Company, as set forth in this Agreement. 
 NOW, THEREFORE, in
consideration of the representations, covenants and agreements contained herein, and certain other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto, intending to be legally bound,
hereby agree as follows: 
 ARTICLE I 

DEFINITIONS 
 1.1
Definitions. The terms defined in this Article I shall, for all purposes of this Agreement, have the respective meanings set forth below: 

“Agreement” shall have the meaning given in the Preamble. 

“Board” shall mean the board of directors of the Company. 












 “Business Combination” shall mean any merger, capital stock
exchange, asset acquisition, stock purchase, reorganization or other similar business combination with one (1) or more businesses, involving the Company. 

“Commission” shall mean the U.S. Securities and Exchange Commission. 

“Common Stock” shall have the meaning given in the Recitals hereto. 

“Company” shall have the meaning given in the Preamble. 

“Demanding Holder” shall mean any Initial Holder or group of Initial Holders that together elects to dispose of
Registrable Securities having an aggregate value of at least $25 million, at the time of the Underwritten Demand, under a Registration Statement pursuant to an Underwritten Offering. 

“Effectiveness Period” shall have the meaning given in subsection 3.1.1 of this Agreement.

 “Exchange Act” shall mean the Securities Exchange Act of 1934, as it may be amended from time to time. 

“Form S-3” shall mean a registration statement on Form S-3 or any similar short-form registration statement that may be available at such time. 

“Founder Shares” shall have the meaning given in the Recitals hereto. 

“Holder Indemnified Persons” shall have the meaning given in subsection 4.1.1 of this
Agreement. 
 “Holders” shall have the meaning given in the Preamble. 

“Initial Holders” shall mean the Sponsor and each of the undersigned officers, directors and director nominees of the
Company listed under Holder on the signature pages hereto. 
 “Maximum Number of Securities” shall have the meaning
given in subsection 2.1.4 of this Agreement. 
 “Misstatement” shall mean an untrue
statement of a material fact or an omission to state a material fact required to be stated in a Registration Statement or necessary to make the statements therein not misleading, or an untrue statement of a material fact or an omission to state a
material fact necessary to make the statements in a Prospectus, in the light of the circumstances under which they were made, not misleading. 

“Piggyback Registration” shall have the meaning given in subsection 2.2.1 of this Agreement.

 “Private Placement Warrants” shall have the meaning given in the Recitals hereto. 

“Pro Rata” shall have the meaning given in subsection 2.1.4 of this Agreement. 

  
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 “Prospectus” shall mean the prospectus included in any Registration
Statement, as supplemented by any and all prospectus supplements and as amended by any and all post-effective amendments and including all material incorporated by reference in such prospectus. 

“Registrable Security” shall mean (i) the shares of Common Stock issued or issuable upon the conversion of any
Founder Shares, (ii) the Private Placement Warrants (including any shares of Common Stock issued or issuable upon the exercise of any such Private Placement Warrants), (iii) any equity securities (including the shares of Common Stock issued or
issuable upon the exercise of any such equity security) of the Company issuable upon conversion of any working capital loans in an amount up to $1,500,000 made to the Company by a Holder, (iv) any outstanding share of Common Stock or any other
equity security (including the shares of Common Stock issued or issuable upon the exercise of any other equity security) of the Company held by a Holder as of the date of this Agreement and (v) any other equity security of the Company issued or
issuable with respect to any such share of Common Stock by way of a stock dividend or stock split or in connection with a combination of shares, recapitalization, merger, consolidation or reorganization; provided, however, that, as to any particular
Registrable Security, such securities shall cease to be Registrable Securities when: (a) a Registration Statement with respect to the sale of such securities shall have become effective under the Securities Act and such securities shall have
been sold, transferred, disposed of or exchanged in accordance with such Registration Statement; (b) such securities shall have been otherwise transferred, new certificates for such securities not bearing a legend restricting further transfer
shall have been delivered by the Company and subsequent public distribution of such securities shall not require registration under the Securities Act; (c) such securities shall have ceased to be outstanding or (d) such securities may be
sold without registration pursuant to Rule 144 promulgated under the Securities Act (or any successor rule promulgated thereafter by the Commission) (but with no volume or other restrictions or limitations). 

“Registration” shall mean a registration effected by preparing and filing a registration statement or similar document
in compliance with the requirements of the Securities Act, and the applicable rules and regulations promulgated thereunder, and any such registration statement having been declared effective by, or become effective pursuant to rules promulgated by,
the Commission. 
 “Registration Expenses” shall mean the out-of-pocket expenses of a Registration, including, without limitation, the following: 
  

	 	(A)	 all registration and filing fees (including fees with respect to filings required to be made with the Financial
Industry Regulatory Authority and any securities exchange on which the Common Stock is then listed); 


  

	 	(B)	 fees and expenses of compliance with securities or blue sky laws (including reasonable fees and disbursements
of counsel for the Underwriters in connection with blue sky qualifications of Registrable Securities); 


  

	 	(C)	 printing, messenger, telephone and delivery expenses; 



 

	 	(D)	 reasonable fees and disbursements of counsel for the Company; 



  
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	 	(E)	 reasonable fees and disbursements of all independent registered public accountants of the Company incurred
specifically in connection with such Registration; and 


  

	 	(F)	 reasonable fees and expenses of one (1) legal counsel selected by the Demanding Holders initiating an
Underwritten Demand, the Requesting Holders participating in an Underwritten Offering and the Holders participating in a Piggyback Registration, as applicable. 



“Registration Statement” shall mean any registration statement under the Securities Act that covers the Registrable
Securities pursuant to the provisions of this Agreement, including the Prospectus included in such registration statement, amendments (including post-effective amendments) and supplements to such registration statement, and all exhibits to and all
material incorporated by reference in such registration statement. 
 “Requesting Holder” shall have the meaning
given in subsection 2.1.3 of this Agreement. 
 “Securities Act” shall mean the Securities
Act of 1933, as amended from time to time. 
 “Shelf Registration” shall have the meaning given in subsection
2.1.1. 
 “Sponsor” shall have the meaning given in the Preamble. 

“Suspension Event” shall have the meaning given in Section 3.4 of this Agreement. 

“Underwriter” shall mean a securities dealer who purchases any Registrable Securities as principal in an Underwritten
Offering and not as part of such dealer’s market-making activities. 
 “Underwritten Demand” shall have the
meaning given in subsection 2.1.3 of this Agreement. 
 “Underwritten Offering” shall mean
a Registration in which securities of the Company are sold to an Underwriter in a firm commitment underwriting for distribution to the public. 

ARTICLE II 

REGISTRATIONS 
 2.1
Registration. 
 2.1.1 Shelf Registration. The Company agrees that, within thirty (30) days after the consummation of the
Business Combination, the Company will file with the Commission (at the Company’s sole cost and expense) a Registration Statement registering the resale or other disposition of the Registrable Securities (a “Shelf
Registration”). 
 2.1.2 Effective Registration. The Company shall use its reasonable best efforts to cause such
Registration Statement to become effective by the Commission as soon as practicable after the initial filing of the Registration Statement. Subject to the limitations contained in this Agreement, the Company shall effect any Shelf Registration on
such appropriate registration form of the Commission (x) as shall be selected by the Company and (y) as shall permit the sale or other 

  
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disposition of the Registrable Securities by the Holders. If at any time a Registration Statement on Form S-3 filed with the Commission pursuant to
Section 2.1.1 of this Agreement is effective and a Holder provides written notice to the Company that it intends to effect an offering of all or part of the Registrable Securities included on such Registration Statement,
the Company will use its best efforts to amend or supplement such Registration Statement as may be necessary in order to enable such offering to take place in accordance with the terms of this Agreement. 

2.1.3 Underwritten Offering. Subject to the provisions of subsection 2.1.4 and
Section 2.3 of this Agreement, any Demanding Holder may make a written demand for an Underwritten Offering pursuant to a Registration Statement filed with the Commission in accordance with
Section 2.1.1 of this Agreement (an “Underwritten Demand”). The Company shall, within ten (10) days of the Company’s receipt of the Underwritten Demand, notify, in writing, all other
Holders of such demand, and each Holder who thereafter requests to include all or a portion of such Holder’s Registrable Securities in such Underwritten Offering pursuant to an Underwritten Demand (each such Holder that requests to include all
or a portion of such Holder’s Registrable Securities in such Underwritten Offering, a “Requesting Holder”) shall so notify the Company, in writing, within two (2) days (one (1) day if such offering is an
overnight or bought Underwritten Offering) after the receipt by the Holder of the notice from the Company. Upon receipt by the Company of any such written notification from a Requesting Holder(s), such Requesting Holder(s) shall be entitled to have
their Registrable Securities included in the Underwritten Offering pursuant to an Underwritten Demand. All such Holders proposing to distribute their Registrable Securities through an Underwritten Offering under this
subsection 2.1.3 shall enter into an underwriting agreement in customary form with the Underwriter(s) selected for such Underwritten Offering by the Demanding Holders initiating the Underwritten Offering. Notwithstanding
the foregoing, the Company is not obligated to effect more than an aggregate of three (3) Underwritten Offerings pursuant to this subsection 2.1.3 and is not obligated to effect an Underwritten Offering pursuant to
this subsection 2.1.3 within ninety (90) days after the closing of an Underwritten Offering. 
 2.1.4
Reduction of Underwritten Offering. If the managing Underwriter or Underwriters in an Underwritten Offering pursuant to an Underwritten Demand, in good faith, advises or advise the Company, the Demanding Holders, the Requesting Holders and
other persons or entities holding Common Stock or other equity securities of the Company that the Company is obligated to include pursuant to separate written contractual arrangements with such persons or entities (if any) in writing that the dollar
amount or number of Registrable Securities or other equity securities of the Company requested to be included in such Underwritten Offering exceeds the maximum dollar amount or maximum number of equity securities of the Company that can be sold in
the Underwritten Offering without adversely affecting the proposed offering price, the timing, the distribution method or the probability of success of such offering (such maximum dollar amount or maximum number of such securities, as applicable,
the “Maximum Number of Securities”), then the Company shall include in such Underwritten Offering, as follows: (i) first, the Registrable Securities of the Demanding Holders and the Requesting Holders (if any) (pro rata
based on the respective number of Registrable Securities that each Demanding Holder and Requesting Holder (if any) has requested be included in such Underwritten Offering and the aggregate number of Registrable Securities that the Demanding Holders
and Requesting Holders have requested be included in such Underwritten Offering (such proportion is referred to herein as “Pro Rata”)) that can be sold without exceeding the Maximum Number of Securities; (ii) second,


  
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to the extent that the Maximum Number of Securities has not been reached under the foregoing clause (i), Common Stock or other equity securities of the Company that the Company desires to sell
and that can be sold without exceeding the Maximum Number of Securities and (iii) third, to the extent that the Maximum Number of Securities has not been reached under the foregoing clauses (i) and (ii), Common Stock or other equity
securities of the Company held by other persons or entities that the Company is obligated to include pursuant to separate written contractual arrangements with such persons or entities and that can be sold without exceeding the Maximum Number of
Securities. 
 2.2 Piggyback Registration. 

2.2.1 Piggyback Rights. Subject to the provisions of subsection 2.2.2 and Section 2.3, if, at any time on or after the date the
Company consummates a Business Combination, the Company proposes to (i) file a Registration Statement under the Securities Act with respect to an offering of equity securities of the Company, or securities or other obligations exercisable or
exchangeable for, or convertible into equity securities of the Company, for its own account or for the account of stockholders of the Company, other than a Registration Statement (a) filed in connection with any employee stock option or other
benefit plan, (b) for an exchange offer or offering of securities solely to the Company’s existing stockholders, (c) for an offering of debt that is convertible into equity securities of the Company or (d) for a dividend
reinvestment plan or (ii) consummate an Underwritten Offering for its own account or for the account of stockholders of the Company, then the Company shall give written notice of such proposed action to all of the Holders of Registrable
Securities as soon as practicable (but in the case of filing a Registration Statement, not less than ten (10) days before the anticipated filing date of such Registration Statement), which notice shall (x) describe the amount and type of
securities to be included, the intended method(s) of distribution and the name of the proposed managing Underwriter or Underwriters, if any, and (y) offer to all of the Holders of Registrable Securities the opportunity to register the sale of
such number of Registrable Securities as such Holders may request in writing within (A) five (5) days in the case of filing a Registration Statement and (B) two (2) days in the case of an Underwritten Offering (unless such offering is an
overnight or bought Underwritten Offering, then one (1) day), in each case after receipt of such written notice (such Registration a “Piggyback Registration”). The Company shall, in good faith, cause such Registrable
Securities to be included in such Piggyback Registration and shall use its best efforts to cause the managing Underwriter or Underwriters of a proposed Underwritten Offering to permit the Registrable Securities requested by the Holders pursuant to
this subsection 2.2.1 to be included in a Piggyback Registration on the same terms and conditions as any similar securities of the Company included in such Piggyback Registration and to permit the sale or other disposition
of such Registrable Securities in accordance with the intended method(s) of distribution thereof. All such Holders proposing to include Registrable Securities in an Underwritten Offering under this subsection 2.2.1 shall
enter into an underwriting agreement in customary form with the Underwriter(s) selected for such Underwritten Offering by the Company. 

2.2.2 Reduction of Piggyback Registration. If the managing Underwriter or Underwriters in an Underwritten Offering that is to be a
Piggyback Registration, in good faith, advises the Company and the Holders of Registrable Securities participating in the Piggyback Registration in writing that the dollar amount or number of shares of the equity securities of the Company that the
Company desires to sell, taken together with (i) the shares of equity securities 

  
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of the Company, if any, as to which Registration or Underwritten Offering has been demanded pursuant to separate written contractual arrangements with persons or entities other than the Holders
of Registrable Securities hereunder, (ii) the Registrable Securities as to which Registration or Underwritten Offering has been requested pursuant to this Section 2.2 and (iii) the shares of equity securities of
the Company, if any, as to which Registration or Underwritten Offering has been requested pursuant to separate written contractual piggyback registration rights of other stockholders of the Company, exceeds the Maximum Number of Securities, then:

 (a) If the Registration or Underwritten Offering is undertaken for the Company’s account, the Company shall include in any such
Registration or Underwritten Offering (A) first, the Common Stock or other equity securities of the Company that the Company desires to sell, which can be sold without exceeding the Maximum Number of Securities; (B) second, to the extent
that the Maximum Number of Securities has not been reached under the foregoing clause (A), the Registrable Securities of Holders exercising their rights to register their Registrable Securities pursuant to subsection 2.2.1
of this Agreement, Pro Rata, which can be sold without exceeding the Maximum Number of Securities and (C) third, to the extent that the Maximum Number of Securities has not been reached under the foregoing clauses (A) and (B), Common Stock
or other equity securities of the Company, if any, as to which Registration or Underwritten Offering has been requested pursuant to written contractual piggyback registration rights of other stockholders of the Company, which can be sold without
exceeding the Maximum Number of Securities; or 
 (b) If the Registration or Underwritten Offering is pursuant to a request by persons or
entities other than the Holders of Registrable Securities, then the Company shall include in any such Registration or Underwritten Offering (A) first, Common Stock or other equity securities of the Company, if any, of such requesting persons or
entities, other than the Holders of Registrable Securities, which can be sold without exceeding the Maximum Number of Securities; (B) second, to the extent that the Maximum Number of Securities has not been reached under the foregoing clause
(A), the Registrable Securities of Holders exercising their rights to register their Registrable Securities pursuant to subsection 2.2.1 of this Agreement, Pro Rata, which can be sold without exceeding the Maximum Number of
Securities; (C) third, to the extent that the Maximum Number of Securities has not been reached under the foregoing clauses (A) and (B), Common Stock or other equity securities of the Company that the Company desires to sell, which can be
sold without exceeding the Maximum Number of Securities and (D) fourth, to the extent that the Maximum Number of Securities has not been reached under the foregoing clauses (A), (B) and (C), Common Stock or other equity securities of the
Company for the account of other persons or entities that the Company is obligated to register pursuant to separate written contractual arrangements with such persons or entities, which can be sold without exceeding the Maximum Number of Securities.

 2.2.3 Piggyback Registration Withdrawal. Any Holder of Registrable Securities shall have the right to withdraw from a Piggyback
Registration for any or no reason whatsoever upon written notification to the Company and the Underwriter or Underwriters (if any) of his, her or its intention to withdraw from such Piggyback Registration prior to the effectiveness of the
Registration Statement filed with the Commission with respect to such Piggyback Registration. The Company (whether on its own good faith determination or as the result of a request for withdrawal by persons pursuant to separate written contractual
obligations) may withdraw a Registration Statement filed with the Commission in connection with a Piggyback Registration at any time prior to the effectiveness of such Registration Statement. Notwithstanding anything to the contrary in this
Agreement, the Company shall be responsible for the Registration Expenses incurred in connection with the Piggyback Registration prior to its withdrawal under this subsection 2.2.3. 

  
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 2.2.4 Unlimited Piggyback Registration Rights. For purposes of clarity, any
Registration or Underwritten Offering effected pursuant to this Section 2.2 shall not be counted as an Underwritten Offering pursuant to an Underwritten Demand effected under Section 2.1 of this
Agreement. 
 2.3 Restrictions on Registration Rights. If (i) the Holders have requested an Underwritten Offering pursuant to an
Underwritten Demand and the Company and the Holders are unable to obtain the commitment of underwriters to firmly underwrite the offer or (ii) the Holders have requested an Underwritten Offering pursuant to an Underwritten Demand and in the
good faith judgment of the Board such Underwritten Offering would be seriously detrimental to the Company and the Board concludes as a result that it is essential to defer the undertaking of such Underwritten Offering at such time, then in each case
the Company shall furnish to such Holders a certificate signed by the Chairman of the Board stating that in the good faith judgment of the Board it would be seriously detrimental to the Company to undertake such Underwritten Offering in the near
future and that it is therefore essential to defer undertaking of such Underwritten Offering. In such event, the Company shall have the right to defer such offering for a period of not more than thirty (30) days; provided, however, that the
Company shall not defer its obligation in this manner more than once in any twelve (12)-month period. 
 ARTICLE III 

COMPANY PROCEDURES 
 3.1
General Procedures. If at any time on or after the date the Company consummates a Business Combination the Company is required to effect the Registration of Registrable Securities pursuant to this Agreement, the Company shall use its best
efforts to effect such Registration to permit the sale or other disposition of such Registrable Securities in accordance with the intended plan of distribution thereof, and pursuant thereto the Company shall, as expeditiously as possible and to the
extent applicable: 
 3.1.1 prepare and file with the Commission as soon as practicable a Registration Statement with respect to such
Registrable Securities and use its reasonable best efforts to cause such Registration Statement to become effective and remain effective until all Registrable Securities covered by such Registration Statement have been sold or are no longer
outstanding (such period, the “Effectiveness Period”); 
 3.1.2 prepare and file with the Commission such amendments
and post-effective amendments to the Registration Statement, and such supplements to the Prospectus, as may be reasonably requested by the Demanding Holders or any Underwriter or as may be required by the rules, regulations or instructions
applicable to the registration form used by the Company or by the Securities Act or rules and regulations thereunder to keep the Registration Statement effective until all Registrable Securities covered by such Registration Statement are sold in
accordance with the intended plan of distribution set forth in such Registration Statement or supplement to the Prospectus or are no longer outstanding; 

  
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 3.1.3 prior to filing a Registration Statement or Prospectus, or any amendment or supplement
thereto, furnish without charge to the Underwriters, if any, and the Holders of Registrable Securities included in such Registration or Underwritten Offering, and such Holders’ legal counsel, copies of such Registration Statement as proposed to
be filed, each amendment and supplement to such Registration Statement (in each case including all exhibits thereto and documents incorporated by reference therein), the Prospectus (including each preliminary Prospectus) and such other documents as
the Underwriters and the Holders of Registrable Securities included in such Registration or the legal counsel for any such Holders may reasonably request in order to facilitate the disposition of the Registrable Securities owned by such Holders;
provided that the Company will not have any obligation to provide any document pursuant to this clause that is available on the Commission’s EDGAR system; 

3.1.4 prior to any public offering of Registrable Securities, use its best efforts to (i) register or qualify the Registrable Securities
covered by the Registration Statement under such securities or “blue sky” laws of such jurisdictions in the United States as the Holders of Registrable Securities included in such Registration Statement (in light of their intended plan of
distribution) may request and (ii) take such action necessary to cause such Registrable Securities covered by the Registration Statement to be registered with or approved by such other governmental authorities as may be necessary by virtue of
the business and operations of the Company and do any and all other acts and things that may be necessary or advisable to enable the Holders of Registrable Securities included in such Registration Statement to consummate the disposition of such
Registrable Securities in such jurisdictions; provided, however, that the Company shall not be required to qualify generally to do business in any jurisdiction where it would not otherwise be required to qualify or take any action to which it would
be subject to general service of process or taxation in any such jurisdiction where it is not then otherwise so subject; 
 3.1.5 cause all
such Registrable Securities to be listed on each securities exchange or automated quotation system on which similar securities issued by the Company are then listed; 

3.1.6 provide a transfer agent or warrant agent, as applicable, and registrar for all such Registrable Securities no later than the effective
date of such Registration Statement; 
 3.1.7 advise each seller of such Registrable Securities, promptly after it shall receive notice or
obtain knowledge thereof, of the issuance of any stop order by the Commission suspending the effectiveness of such Registration Statement or the initiation or threatening of any proceeding for such purpose and promptly use its reasonable best
efforts to prevent the issuance of any stop order or to obtain its withdrawal if such stop order should be issued; 
 3.1.8 during the
Effectiveness Period, furnish a conformed copy of each filing of any Registration Statement or Prospectus or any amendment or supplement to such Registration Statement or Prospectus or any document that is to be incorporated by reference into such
Registration Statement or Prospectus, promptly after such filing of such documents with the Commission to each seller of such Registrable Securities or its counsel; provided that the Company will not have any obligation to provide any document
pursuant to this clause that is available on the Commission’s EDGAR system; 

  
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 3.1.9 notify the Holders at any time when a Prospectus relating to such Registration
Statement is required to be delivered under the Securities Act; 
 3.1.10 subject to the provisions of this Agreement, notify the Holders of
the happening of any event as a result of which a Misstatement exists, and then to correct such Misstatement as set forth in Section 3.4 of this Agreement; 

3.1.11 permit a representative of the Holders, the Underwriters, if any, and any attorney or accountant retained by such Holders or
Underwriter to participate, at each such person’s own expense, in the preparation of the Registration Statement or the Prospectus, and cause the Company’s officers, directors and employees to supply all information reasonably requested by
any such representative, Underwriter, attorney or accountant in connection with the Registration; provided, however, that such representatives or Underwriters enter into a confidentiality agreement, in form and substance reasonably satisfactory to
the Company, prior to the release or disclosure of any such information; 
 3.1.12 obtain a comfort letter from the Company’s
independent registered public accountants in the event of an Underwritten Offering, in customary form and covering such matters of the type customarily covered by comfort letters as the managing Underwriter may reasonably request, and reasonably
satisfactory to a majority-in-interest of the participating Holders; 

3.1.13 on the date the Registrable Securities are delivered for sale pursuant to such Registration, obtain an opinion, dated such date, of
counsel representing the Company for the purposes of such Registration, addressed to the placement agent or sales agent, if any, and the Underwriters, if any, covering such legal matters with respect to the Registration in respect of which such
opinion is being given as the placement agent, sales agent or Underwriter may reasonably request and as are customarily included in such opinions and negative assurance letters, and reasonably satisfactory to such placement agent, sales agent or
Underwriter; 
 3.1.14 in the event of any Underwritten Offering, enter into and perform its obligations under an underwriting agreement, in
usual and customary form, with the managing Underwriter of such offering; 
 3.1.15 make available to its security holders, as soon as
reasonably practicable, an earnings statement covering the period of at least twelve (12) months beginning with the first (1st) day of the Company’s first (1st) full calendar quarter after the effective date of the Registration Statement
which satisfies the provisions of Section 11(a) of the Securities Act and Rule 158 thereunder (or any successor rule promulgated thereafter by the Commission); 

3.1.16 use its reasonable efforts to make available senior executives of the Company to participate in customary “road show”
presentations that may be reasonably requested by the Underwriter in any Underwritten Offering; and 
 3.1.17 otherwise, in good faith,
cooperate reasonably with, and take such customary actions as may reasonably be requested by the Holders, in connection with such Registration. 

  
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 3.2 Registration Expenses. The Registration Expenses in respect of all Registrations
shall be borne by the Company. It is acknowledged by the Holders that the Holders shall bear all incremental selling expenses relating to the sale of Registrable Securities, such as Underwriters’ commissions and discounts, brokerage fees,
Underwriter marketing costs and, other than as set forth in the definition of “Registration Expenses,” all reasonable fees and expenses of any legal counsel representing the Holders. 

3.3 Requirements for Participation in Underwritten Offerings. No person may participate in any Underwritten Offering for equity
securities of the Company pursuant to a Registration initiated by the Company hereunder unless such person (i) agrees to sell such person’s securities on the basis provided in any underwriting arrangements approved by the Company and
(ii) completes and executes all customary questionnaires, powers of attorney, indemnities, lock-up agreements, underwriting agreements and other customary documents as may be reasonably required under the
terms of such underwriting arrangements. 
 3.4 Suspension of Sales. Notwithstanding anything to the contrary in this Agreement, the
Company shall be entitled to (A) delay or postpone the (i) initial effectiveness of any Registration Statement or (ii) launch of any Underwritten Offering, in each case, filed or requested pursuant to this Agreement, and (B) from
time to time to require the Holders not to sell under any Registration Statement or Prospectus or to suspend the effectiveness thereof, if the negotiation or consummation of a transaction by the Company or its subsidiaries is pending or an event has
occurred, which negotiation, consummation or event, the Board reasonably believes, upon the advice of legal counsel, would require additional disclosure by the Company in the applicable Registration Statement or Prospectus of material information
that the Company has a bona fide business purpose for keeping confidential and the non-disclosure of which in the Registration Statement or Prospectus would be expected, in the reasonable determination of the
Board, upon the advice of legal counsel, to cause the Registration Statement or Prospectus to fail to comply with applicable disclosure requirements (each such circumstance, a “Suspension Event”); provided, however, that the
Company may not delay or suspend a Registration Statement, Prospectus or Underwritten Offering on more than two (2) occasions, for more than sixty (60) consecutive calendar days, or more than ninety (90) total calendar days, in each
case during any twelve (12)-month period. Upon receipt of any written notice from the Company of a Suspension Event while a Registration Statement filed pursuant to this Agreement is effective or if as a result of a Suspension Event a Misstatement
exists, each Holder agrees that (i) it will immediately discontinue offers and sales of Registered Securities under each Registration Statement filed pursuant to this Agreement until the Holder receives copies of a supplemental or amended
Prospectus (which the Company agrees to promptly prepare) that corrects the relevant misstatements or omissions and receives notice that any post-effective amendment has become effective or unless otherwise notified by the Company that it may resume
such offers and sales and (ii) it will maintain the confidentiality of information included in such written notice delivered by the Company unless otherwise required by law or subpoena. If so directed by the Company, the Holders will deliver to
the Company or, in Holders’ sole discretion destroy, all copies of each Prospectus covering Registrable Securities in Holders’ possession; provided, however, that this obligation to deliver or destroy shall not apply (A) to the extent
the Holders are required to retain a copy of such Prospectus (x) to comply with applicable legal, regulatory, self-regulatory or professional requirements or (y) in accordance with a bona fide
pre-existing document retention policy or (B) to copies stored electronically on archival servers as a result of automatic data back-up. 

  
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 3.5 Reporting Obligations. As long as any Holder shall own Registrable Securities,
the Company, at all times while it shall be a reporting company under the Exchange Act, covenants to file timely (or obtain extensions in respect thereof and file within the applicable grace period) all reports required to be filed by the Company
after the date hereof pursuant to Sections 13(a) or 15(d) of the Exchange Act. The Company further covenants that it shall take such further action as any Holder may reasonably request, all to the extent required from time to time to enable such
Holder to sell shares of Registrable Securities held by such Holder without registration under the Securities Act within the limitation of the exemptions provided by Rule 144 promulgated under the Securities Act (or any successor rule promulgated
thereafter by the Commission), including providing any legal opinions. Upon the request of any Holder, the Company shall deliver to such Holder a written certification of a duly authorized officer as to whether it has complied with such
requirements. 
 ARTICLE IV

INDEMNIFICATION AND CONTRIBUTION 

4.1 Indemnification. 

4.1.1 The Company agrees to indemnify, to the extent permitted by law, each Holder of Registrable Securities, its officers and directors and
each person who controls such Holder (within the meaning of the Securities Act) (collectively, the “Holder Indemnified Persons”) against all losses, claims, damages, liabilities and expenses (including reasonable
attorneys’ fees and inclusive of all reasonable attorneys’ fees arising out of the enforcement of each such persons’ rights under this Section 4.1) resulting from any untrue or alleged untrue statement of
material fact contained in any Registration Statement, Prospectus or preliminary Prospectus or any amendment thereof or supplement thereto or any omission or alleged omission of a material fact required to be stated therein or necessary to make the
statements therein, in the light of the circumstances under which they were made, not misleading, except insofar as the same are caused by or contained in any information furnished in writing to the Company by or on behalf of such Holder Indemnified
Person specifically for use therein. 
 4.1.2 In connection with any Registration Statement in which a Holder of Registrable Securities is
participating, such Holder shall furnish to the Company in writing such information and affidavits as the Company reasonably requests for use in connection with any such Registration Statement or Prospectus and, to the extent permitted by law,
shall, severally and not jointly, indemnify the Company, its directors and officers and agents and each person who controls the Company (within the meaning of the Securities Act) against any losses, claims, damages, liabilities and expenses
(including reasonable attorneys’ fees and inclusive of all reasonable attorneys’ fees arising out of the enforcement of each such persons’ rights under this Section 4.1) resulting from any untrue or alleged
untrue statement of material fact contained in any Registration Statement, Prospectus or preliminary Prospectus or any amendment thereof or supplement thereto or any omission or alleged omission of a material fact required to be stated therein or
necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading, but only to the extent that the same are made in reliance on and in conformity with information relating to the Holder so
furnished in writing to the Company by or on behalf of such Holder specifically for use therein. In no event shall the liability of any selling Holder hereunder be greater in amount than the net proceeds received by such Holder from the sale of
Registrable Securities pursuant to such Registration Statement giving rise to such indemnification obligation. 

  
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 4.1.3 Any person entitled to indemnification herein shall (i) give prompt written
notice to the indemnifying party of any claim with respect to which it seeks indemnification (provided that the failure to give prompt notice shall not impair any person’s right to indemnification hereunder to the extent such failure has not
materially prejudiced the indemnifying party) and (ii) unless in such indemnified party’s reasonable judgment a conflict of interest between such indemnified and indemnifying parties may exist with respect to such claim or there may be
reasonable defenses available to the indemnified party that are different from or additional to those available to the indemnifying party, permit such indemnifying party to assume the defense of such claim with counsel reasonably satisfactory to the
indemnified party. If such defense is assumed, the indemnifying party shall not be subject to any liability for any settlement made by the indemnified party without its consent (but such consent shall not be unreasonably withheld). An indemnifying
party who is not entitled to, or elects not to, assume the defense of a claim shall not be obligated to pay the fees and expenses of more than one counsel for all parties indemnified by such indemnifying party with respect to such claim, unless in
the reasonable judgment of any indemnified party a conflict of interest may exist between such indemnified party and any other of such indemnified parties with respect to such claim. No indemnifying party shall, without the consent of the
indemnified party, consent to the entry of any judgment or enter into any settlement which cannot be settled in all respects by the payment of money (and such money is so paid by the indemnifying party pursuant to the terms of such settlement) or
which settlement does not include as an unconditional term thereof the giving by the claimant or plaintiff to such indemnified party of a release from all liability in respect to such claim or litigation. 

4.1.4 The indemnification provided for under this Agreement shall remain in full force and effect regardless of any investigation made by or
on behalf of the indemnified party or any officer, director or controlling person of such indemnified party and shall survive the transfer of securities. 

4.1.5 If the indemnification provided under this Section 4.1 is held by a court of competent jurisdiction to be
unavailable to an indemnified party in respect of any losses, claims, damages, liabilities and expenses referred to herein, then the indemnifying party, in lieu of indemnifying the indemnified party, shall to the extent permitted by law contribute
to the amount paid or payable by the indemnified party as a result of such losses, claims, damages, liabilities and expenses in such proportion as is appropriate to reflect the relative fault of the indemnifying party and the indemnified party, as
well as any other relevant equitable considerations. The relative fault of the indemnifying party and indemnified party shall be determined by a court of law by reference to, among other things, whether the untrue or alleged untrue statement of a
material fact or the omission or alleged omission to state a material fact relates to information supplied by such indemnifying party or such indemnified party and the indemnifying party’s and indemnified party’s relative intent,
knowledge, access to information and opportunity to correct or prevent such action; provided, however, that the liability of any Holder under this subsection 4.1.5 shall be limited to the amount of the net proceeds received
by such Holder in such offering giving rise to such liability. The amount paid or payable by a party as a result of the losses or other liabilities referred to above shall be deemed to include, subject to the limitations set forth in
subsections 4.1.1, 4.1.2 and 4.1.3 of this Agreement, any legal or other fees, charges or expenses reasonably incurred by such party in connection with any investigation or proceeding. The parties hereto agree
that it would not be just and equitable if contribution pursuant to this subsection 4.1.5 were determined by pro rata allocation or by any other method of allocation, which does not take account of the equitable
considerations referred to in this subsection 4.1.5. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be entitled to contribution pursuant to this
subsection 4.1.5 from any person who was not guilty of such fraudulent misrepresentation. 

  
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 ARTICLE V 

MISCELLANEOUS 
 5.1
Notices. Any notice or communication under this Agreement must be in writing and given by (i) deposit in the United States mail, addressed to the party to be notified, postage prepaid and registered or certified with return receipt
requested; (ii) delivery in person or by courier service providing evidence of delivery or (iii) transmission by hand delivery, telecopy, telegram, facsimile or email. Each notice or communication that is mailed, delivered or transmitted
in the manner described above shall be deemed sufficiently given, served, sent and received, in the case of mailed notices, on the third (3rd) business day following the date on which it is mailed, in the case of notices delivered by courier
service, hand delivery, telecopy or telegram, at such time as it is delivered to the addressee (with the delivery receipt or the affidavit of messenger) or at such time as delivery is refused by the addressee upon presentation, and in the case of
notices delivered by facsimile or email, at such time as it is successfully transmitted to the addressee. Any notice or communication under this Agreement must be addressed, if to the Company or the Sponsor, to: 425 Houston Street, Suite 400, Fort
Worth, Texas 76102, or by email at: communications@blackmtn.com, and, if to any Holder, to the address of such Holder as it appears in the applicable register for the Registrable Securities or such other address as may be designated in writing by
such Holder (including on the signature pages hereto). Any party may change its address for notice at any time and from time to time by written notice to the other parties hereto, and such change of address shall become effective thirty
(30) days after delivery of such notice as provided in this Section 5.1.  
 5.2 Assignment; No Third-Party
Beneficiaries. 
 5.2.1 This Agreement and the rights, duties and obligations of the Company hereunder may not be assigned or delegated
by the Company in whole or in part. 
 5.2.2 This Agreement and the provisions hereof shall be binding upon and shall inure to the benefit
of each of the parties and its successors. 
 5.2.3 This Agreement shall not confer any rights or benefits on any persons that are not
parties hereto, other than as expressly set forth in this Agreement and this Section 5.2. 
 5.2.4 No assignment
by any party hereto of such party’s rights, duties and obligations hereunder shall be binding upon or obligate the Company unless and until the Company shall have received (i) written notice of such assignment as provided in
Section 5.1 of this Agreement and (ii) the written agreement of the assignee, in a form reasonably satisfactory to the Company, to be bound by the terms and provisions of this Agreement (which may be accomplished by an
addendum or certificate of joinder to this Agreement). Any transfer or assignment made other than as provided in this Section 5.2 shall be null and void. 

  
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 5.3 Counterparts. This Agreement may be executed in multiple counterparts (including
facsimile or PDF counterparts), each of which shall be deemed an original, and all of which together shall constitute the same instrument, but only one of which need be produced. 

5.4 Governing Law; Venue. NOTWITHSTANDING THE PLACE WHERE THIS AGREEMENT MAY BE EXECUTED BY ANY OF THE PARTIES HERETO, THE PARTIES
EXPRESSLY AGREE THAT THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED UNDER THE LAWS OF THE STATE OF NEW YORK AS APPLIED TO AGREEMENTS AMONG NEW YORK RESIDENTS ENTERED INTO AND TO BE PERFORMED ENTIRELY WITHIN NEW YORK, WITHOUT REGARD TO THE
CONFLICT OF LAW PROVISIONS OF SUCH JURISDICTION. 
 5.5 Amendments and Modifications. Upon the written consent of the Company and the
Holders of at least a majority in interest of the Registrable Securities at the time in question, compliance with any of the provisions, covenants and conditions set forth in this Agreement may be waived, or any of such provisions, covenants or
conditions may be amended or modified; provided, however, that notwithstanding the foregoing, any amendment hereto or waiver hereof that adversely affects one Holder, solely in his, her or its capacity as a holder of the shares of capital stock of
the Company, in a manner that is materially different from the other Holders (in such capacity) shall require the consent of the Holder so affected. No course of dealing between any Holder or the Company and any other party hereto or any failure or
delay on the part of a Holder or the Company in exercising any rights or remedies under this Agreement shall operate as a waiver of any rights or remedies of any Holder or the Company. No single or partial exercise of any rights or remedies under
this Agreement by a party shall operate as a waiver or preclude the exercise of any other rights or remedies hereunder or thereunder by such party. 

5.6 Other Registration Rights. The Company represents and warrants that no person, other than (a) a Holder of Registrable
Securities and (b) the holders of the Company’s warrants pursuant to that certain Warrant Agreement, dated as of October 13, 2021, by and between the Company and Continental Stock Transfer & Trust Company, has any right to
require the Company to register any securities of the Company for sale or to include such securities of the Company in any Registration Statement filed by the Company for the sale of securities for its own account or for the account of any other
person. Further, the Company represents and warrants that this Agreement supersedes any other registration rights agreement or agreement with similar terms and conditions and in the event of a conflict between any such agreement or agreements and
this Agreement, the terms of this Agreement shall prevail. 
 5.7 Term. This Agreement shall terminate upon the earlier of
(i) the tenth (10th) anniversary of the date of this Agreement and (ii) with respect to any Holder, the date as of which such Holder ceases to hold any Registrable Securities. The provisions of Article IV of this
Agreement shall survive any termination. 
 [Signature Page Follows] 

  
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 IN WITNESS WHEREOF, the undersigned have caused this Agreement to be executed as of
the date first written above. 
  

			
	COMPANY:
	
	BLACK MOUNTAIN ACQUISITION CORP.,
	a Delaware corporation
		
	By:	 	 /s/ Rhett Bennett

	Name:	 	Rhett Bennett
	Title:	 	Chief Executive Officer
	
	HOLDERS:
	
	BLACK MOUNTAIN SPONSOR LLC,
	a Delaware limited liability company
		
	By:	 	 /s/ Rhett Bennett

	Name:	 	Rhett Bennett
	Title:	 	Chief Executive Officer
	
	 /s/ Mel G. Riggs

	Mel G. Riggs
	
	 /s/ Charles W. Yates

	Charles W. Yates
	
	 /s/ Stephen Straty

	Stephen Straty


 [Signature Page to Registration Rights Agreement]