Document:

Exhibit 10.7

   

  FORM OF

  INDEMNITY AGREEMENT

   

  THIS INDEMNITY AGREEMENT (this “Agreement”) is made as of [●], 2021, by and between FORTISTAR SUSTAINABLE SOLUTIONS CORP., a Delaware corporation
    (the “Company”), and [●] (“Indemnitee”).

   

  RECITALS

   

  WHEREAS, highly competent persons have become more reluctant to serve publicly-held corporations as directors, officers or in other capacities unless they are
    provided with adequate protection through insurance or adequate indemnification against inordinate risks of claims and actions against them arising out of their service to and activities on behalf of such corporations;

   

  WHEREAS, the Board of Directors of the Company (the “Board”) has determined that, in order to attract and retain qualified individuals, the
    Company will attempt to maintain on an ongoing basis, at its sole expense, liability insurance to protect persons serving the Company and its subsidiaries from certain liabilities. Although the furnishing of such insurance has been a customary and
    widespread practice among publicly traded corporations and other business enterprises, the Company believes that, given current market conditions and trends, such insurance may be available to it in the future only at higher premiums and with more
    exclusions. At the same time, directors, officers and other persons in service to corporations or business enterprises are being increasingly subjected to expensive and time-consuming litigation relating to, among other things, matters that
    traditionally would have been brought only against the Company or business enterprise itself. The Amended and Restated Certificate of Incorporation (the “Charter”) and the Bylaws of the Company require indemnification of the officers and
    directors of the Company. Indemnitee may also be entitled to indemnification pursuant to applicable provisions of the Delaware General Corporation Law (“DGCL”). The Charter, Bylaws and the DGCL expressly provide that the indemnification
    provisions set forth therein are not exclusive, and thereby contemplate that contracts may be entered into between the Company and members of the Board, officers and other persons with respect to indemnification, hold harmless, exoneration, advancement
    and reimbursement rights;

   

  WHEREAS, the uncertainties relating to such insurance and to indemnification have increased the difficulty of attracting and retaining such persons;

   

  WHEREAS, the Board has determined that the increased difficulty in attracting and retaining such persons is detrimental to the best interests of the Company’s
    stockholders and that the Company should act to assure such persons that there will be increased certainty of such protection in the future;

   

  WHEREAS, it is reasonable, prudent and necessary for the Company contractually to obligate itself to indemnify, hold harmless, exonerate and to advance expenses
    on behalf of, such persons to the fullest extent permitted by applicable law so that they will serve or continue to serve the Company free from undue concern that they will not be so protected against liabilities;

   

  WHEREAS, this Agreement is a supplement to and in furtherance of the Charter and Bylaws of the Company and any resolutions adopted pursuant thereto, and shall
    not be deemed a substitute therefor, nor to diminish or abrogate any rights of Indemnitee thereunder; and

   

  WHEREAS, Indemnitee may not be willing to serve as an officer or director, advisor or in another capacity without adequate protection, and the Company desires
    Indemnitee to serve in such capacity. Indemnitee is willing to serve, continue to serve and to take on additional service for or on behalf of the Company on the condition that he or she be so indemnified;

   

  

  
     

    
      
 

  

  
   

  NOW, THEREFORE, in consideration of the premises and the covenants contained herein and subject to the provisions of the letter agreement dated as of [●], 2021
    between the Company and Indemnitee pursuant to the Underwriting Agreement among the Company and the representatives of the underwriters named therein in connection with the Company’s initial public offering, the Company and Indemnitee do hereby
    covenant and agree as follows:

   

  TERMS AND CONDITIONS

   

  1.            SERVICES TO THE
      COMPANY. In consideration of the Company’s covenants and obligations hereunder, Indemnitee will serve or continue to serve as an officer, director, advisor, key employee or in any other capacity of the Company, as applicable, for so long as
    Indemnitee is duly elected, appointed or retained or until Indemnitee tenders his or her resignation or until Indemnitee is removed.

   

  2.            DEFINITIONS.
    As used in this Agreement:

   

  2.1.          References to “agent” shall mean any person who is or was
    a director, officer or employee of the Company or a subsidiary of the Company or other person authorized by the Company to act for the Company, to include such person serving in such capacity as a director, officer, employee, advisor, fiduciary or
    other official of another corporation, partnership, limited liability company, joint venture, trust or other enterprise at the request of, for the convenience of, or to represent the interests of the Company or a subsidiary of the Company.

   

  2.2.          The terms “Beneficial Owner” and “Beneficial
        Ownership” shall have the meanings set forth in Rule 13d-3 promulgated under the Exchange Act (as defined below) as in effect on the date hereof.

   

  2.3.          A “Change in Control” shall be deemed to occur upon the
    earliest to occur after the date of this Agreement of any of the following events:

   

  2.3.1.           Acquisition of Stock by Third Party. Other than an affiliate of
    FSSC Sponsor LLC (the “Sponsor”), any Person (as defined below) is or becomes the Beneficial Owner, directly or indirectly, of securities of the Company representing fifteen percent (15%) or more of the combined voting power of the
    Company’s then outstanding securities entitled to vote generally in the election of directors, unless (1) the change in the relative Beneficial Ownership of the Company’s securities by any Person results solely from a reduction in the aggregate number
    of outstanding shares of securities entitled to vote generally in the election of directors, or (2) such acquisition was approved in advance by the Continuing Directors (as defined below) and such acquisition would not constitute a Change in Control
    under part 2.3.3 of this definition;

   

  2.3.2.           Change in Board of Directors. Individuals who, as of the date
    hereof, constitute the Board, and any new director whose election by the Board or nomination for election by the Company’s stockholders was approved by a vote of at least two thirds of the directors then still in office who were directors on the date
    hereof or whose election or nomination for election was previously so approved (collectively, the “Continuing Directors”), cease for any reason to constitute at least a majority of the members of the Board;

   

  2.3.3.           Corporate Transactions. The effective date of a merger, capital
    stock exchange, asset acquisition, stock purchase, reorganization or similar business combination, involving the Company and one or more businesses (a “Business Combination”), in each case, unless, following such Business Combination: (1)
    all or substantially all of the individuals and entities who were the Beneficial Owners of securities entitled to vote generally in the election of directors immediately prior to such Business Combination beneficially own, directly or indirectly, more
    than 51% of the combined voting power of the then outstanding securities of the Company entitled to vote generally in the election of directors resulting from such Business Combination (including, without limitation, a corporation which as a result of
    such transaction owns the Company or all or substantially all of the Company’s assets either directly or through one or more Subsidiaries (as defined below)) in substantially the same proportions as their ownership immediately prior to such Business
    Combination, of the securities entitled to vote generally in the election of directors; (2) other than an affiliate of the Sponsor, no Person (excluding any corporation resulting from such Business Combination) is the Beneficial Owner, directly or
    indirectly, of fifteen percent (15%) or more of the combined voting power of the then outstanding securities entitled to vote generally in the election of directors of the surviving corporation except to the extent that such ownership existed prior to
    the Business Combination; and (3) at least a majority of the Board of Directors of the corporation resulting from such Business Combination were Continuing Directors at the time of the execution of the initial agreement, or of the action of the Board
    of Directors, providing for such Business Combination;

   

  

  
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  2.3.4.           Liquidation. The approval by the stockholders of the Company of
    a complete liquidation of the Company or an agreement or series of agreements for the sale or disposition by the Company of all or substantially all of the Company’s assets, other than factoring the Company’s current receivables or escrows due (or, if
    such stockholder approval is not required, the decision by the Board to proceed with such a liquidation, sale, or disposition in one transaction or a series of related transactions); or

   

  2.3.5.           Other Events. There occurs any other event of a nature that
    would be required to be reported in response to Item 6(e) of Schedule 14A of Regulation 14A (or any successor thereof) (or a response to any similar item on any similar schedule or form) promulgated under the Exchange Act (as defined below), whether or
    not the Company is then subject to such reporting requirement.

   

  2.4.         “Corporate Status” describes the status of a person who is
    or was a director, officer, trustee, general partner, manager, managing member, fiduciary, employee or agent of the Company or of any other Enterprise (as defined below) which such person is or was serving at the request of the Company.

   

  2.5.         “Delaware Court” shall mean the Court of Chancery of the
    State of Delaware.

   

  2.6.         “Disinterested Director” shall mean a director of the
    Company who is not and was not a party to the Proceeding (as defined below) in respect of which indemnification is sought by Indemnitee.

   

  2.7.         “Enterprise” shall mean the Company and any other
    corporation, constituent corporation (including any constituent of a constituent) absorbed in a consolidation or merger to which the Company (or any of its wholly owned subsidiaries) is a party, limited liability company, partnership, joint venture,
    trust, employee benefit plan or other enterprise of which Indemnitee is or was serving at the request of the Company as a director, officer, trustee, general partner, manager, managing member, fiduciary, employee or agent.

   

  2.8.         “Exchange Act” shall mean the Securities Exchange Act of
    1934, as amended.

   

  2.9.         “Expenses” shall include all direct and indirect costs,
    fees and expenses of any type or nature whatsoever, including, without limitation, all attorneys’ fees and costs, retainers, court costs, transcript costs, fees of experts, witness fees, travel expenses, fees of private investigators and professional
    advisors, duplicating costs, printing and binding costs, telephone charges, postage, delivery service fees, fax transmission charges, secretarial services and all other disbursements, obligations or expenses in connection with prosecuting, defending,
    preparing to prosecute or defend, investigating, being or preparing to be a witness in, settlement or appeal of, or otherwise participating in, a Proceeding (as defined below), including reasonable compensation for time spent by Indemnitee for which he
    or she is not otherwise compensated by the Company or any third party. Expenses also shall include Expenses incurred in connection with any appeal resulting from any Proceeding (as defined below), including without limitation the principal, premium,
    security for, and other costs relating to any cost bond, supersede as bond, or other appeal bond or its equivalent. Expenses, however, shall not include amounts paid in settlement by Indemnitee or the amount of judgments or fines against Indemnitee.

   

  2.10.       References to “fines” shall include any excise tax assessed
    on Indemnitee with respect to any employee benefit plan; references to “serving at the request of the Company” shall include any service as a director, officer, employee, agent or fiduciary of the Company which imposes duties on, or involves services
    by, such director, officer, employee, agent or fiduciary with respect to an employee benefit plan, its participants or beneficiaries; and if Indemnitee acted in good faith and in a manner Indemnitee reasonably believed to be in the best interests of
    the participants and beneficiaries of an employee benefit plan, Indemnitee shall be deemed to have acted in a manner “not opposed to the best interests of the Company” as referred to in this Agreement.

   

  2.11.        “Independent Counsel” shall mean a law firm or a member of
    a law firm with significant experience in matters of corporate law and that neither presently is, nor in the past five years has been, retained to represent: (i) the Company or Indemnitee in any matter material to either such party (other than with
    respect to matters concerning Indemnitee under this Agreement, or of other indemnitees under similar indemnification agreements); or (ii) any other party to the Proceeding (as defined below) giving rise to a claim for indemnification hereunder.
    Notwithstanding the foregoing, the term “Independent Counsel” shall not include any person who, under the applicable standards of professional conduct then prevailing, would have a conflict of interest in representing either the Company
    or Indemnitee in an action to determine Indemnitee’s rights under this Agreement.

   

  

  
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  2.12.       The term “Person” shall have the meaning as set forth in
    Sections 13(d) and 14(d) of the Exchange Act as in effect on the date hereof; provided, however, that “Person” shall exclude: (i) the Company; (ii) any Subsidiaries (as defined below) of the Company; (iii) any employment benefit plan of the Company or
    of a Subsidiary (as defined below) of the Company or of any corporation owned, directly or indirectly, by the stockholders of the Company in substantially the same proportions as their ownership of stock of the Company; and (iv) any trustee or other
    fiduciary holding securities under an employee benefit plan of the Company or of a Subsidiary (as defined below) of the Company or of a corporation owned directly or indirectly by the stockholders of the Company in substantially the same proportions as
    their ownership of stock of the Company.

   

  2.13.       The term “Proceeding” shall include any threatened, pending
    or completed action, suit, arbitration, mediation, alternate dispute resolution mechanism, investigation, inquiry, administrative hearing or any other actual, threatened or completed proceeding, whether brought in the right of the Company or otherwise
    and whether of a civil (including intentional or unintentional tort claims), criminal, administrative, or investigative or related nature, in which Indemnitee was, is, will or might be involved as a party or otherwise by reason of the fact that
    Indemnitee is or was a director or officer of the Company, by reason of any action (or failure to act) taken by him or her or of any action (or failure to act) on his or her part while acting as a director or officer of the Company, or by reason of the
    fact that he or she is or was serving at the request of the Company as a director, officer, trustee, general partner, manager, managing member, fiduciary, employee or agent of any other Enterprise, in each case whether or not serving in such capacity
    at the time any liability or expense is incurred for which indemnification, reimbursement, or advancement of expenses can be provided under this Agreement.

   

  2.14.       The term “Subsidiary,” with respect to any Person, shall
    mean any corporation, limited liability company, partnership, joint venture, trust or other entity of which a majority of the voting power of the voting equity securities or equity interest is owned, directly or indirectly, by that Person.

   

  3.           INDEMNITY IN
      THIRD-PARTY PROCEEDINGS.

   

  To the fullest extent permitted by applicable law, the Company shall indemnify, hold harmless and exonerate Indemnitee in accordance with the provisions of this Section 3 if
    Indemnitee was, is, or is threatened to be made, a party to or a participant (as a witness or otherwise) in any Proceeding, other than a Proceeding by or in the right of the Company to procure a judgment in its favor. Pursuant to this Section 3,
    Indemnitee shall be indemnified, held harmless and exonerated against all Expenses, judgments, liabilities, fines, penalties and amounts paid in settlement (including all interest, assessments and other charges paid or payable in connection with or in
    respect of such Expenses, judgments, fines, penalties and amounts paid in settlement) actually and reasonably incurred by Indemnitee or on his or her behalf in connection with such Proceeding or any claim, issue or matter therein, if Indemnitee acted
    in good faith and in a manner he or she reasonably believed to be in or not opposed to the best interests of the Company and, in the case of a criminal Proceeding, had no reasonable cause to believe that his or her conduct was unlawful.

   

  4.           INDEMNITY IN
      PROCEEDINGS BY OR IN THE RIGHT OF THE COMPANY.

   

  To the fullest extent permitted by applicable law, the Company shall indemnify, hold harmless and exonerate Indemnitee in accordance with the provisions of this Section 4 if
    Indemnitee was, is, or is threatened to be made, a party to or a participant (as a witness or otherwise) in any Proceeding by or in the right of the Company to procure a judgment in its favor. Pursuant to this Section 4, Indemnitee shall be
    indemnified, held harmless and exonerated against all Expenses actually and reasonably incurred by him or her or on his or her behalf in connection with such Proceeding or any claim, issue or matter therein, if Indemnitee acted in good faith and in a
    manner he or she reasonably believed to be in or not opposed to the best interests of the Company. No indemnification, hold harmless or exoneration for Expenses shall be made under this Section 4 in respect of any claim, issue or matter as to
    which Indemnitee shall have been finally adjudged by a court to be liable to the Company, unless and only to the extent that any court in which the Proceeding was brought or the Delaware Court shall determine upon application that, despite the
    adjudication of liability but in view of all the circumstances of the case, Indemnitee is fairly and reasonably entitled to indemnification, to be held harmless or to exoneration.

   

  

  
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  5.           INDEMNIFICATION
      FOR EXPENSES OF A PARTY WHO IS WHOLLY OR PARTLY SUCCESSFUL.

   

  Notwithstanding any other provisions of this Agreement except for Section 27, to the extent that Indemnitee was or is a party to (or a participant in) and is successful, on the
    merits or otherwise, in any Proceeding or in defense of any claim, issue or matter therein, in whole or in part, the Company shall, to the fullest extent permitted by applicable law, indemnify, hold harmless and exonerate Indemnitee against all
    Expenses actually and reasonably incurred by him or her in connection therewith. If Indemnitee is not wholly successful in such Proceeding but is successful, on the merits or otherwise, as to one or more but less than all claims, issues or matters in
    such Proceeding, the Company shall, to the fullest extent permitted by applicable law, indemnify, hold harmless and exonerate Indemnitee against all Expenses actually and reasonably incurred by him or her or on his or her behalf in connection with each
    successfully resolved claim, issue or matter. If Indemnitee is not wholly successful in such Proceeding, the Company also shall, to the fullest extent permitted by applicable law, indemnify, hold harmless and exonerate Indemnitee against all Expenses
    reasonably incurred in connection with a claim, issue or matter related to any claim, issue, or matter on which Indemnitee was successful. For purposes of this Section 5 and without limitation, the termination of any claim, issue or matter in
    such a Proceeding by dismissal, with or without prejudice, shall be deemed to be a successful result as to such claim, issue or matter.

   

  6.           INDEMNIFICATION
      FOR EXPENSES OF A WITNESS.

   

  Notwithstanding any other provision of this Agreement except for Section 27, to the extent that Indemnitee is, by reason of his or her Corporate Status, a witness in any
    Proceeding to which Indemnitee is not a party, he or she shall, to the fullest extent permitted by applicable law, be indemnified, held harmless and exonerated against all Expenses actually and reasonably incurred by him or her or on his or her behalf
    in connection therewith.

   

  7.           ADDITIONAL
      INDEMNIFICATION, HOLD HARMLESS AND EXONERATION RIGHTS.

   

  7.1.           Notwithstanding any limitation in Sections 3, 4, or 5,
    except for Section 27, the Company shall, to the fullest extent permitted by applicable law, indemnify, hold harmless and exonerate Indemnitee if Indemnitee is a party to or threatened to be made a party to any Proceeding (including a
    Proceeding by or in the right of the Company to procure a judgment in its favor) against all Expenses, judgments, fines, penalties and amounts paid in settlement (including all interest, assessments and other charges paid or payable in connection with
    or in respect of such Expenses, judgments, fines, penalties and amounts paid in settlement) actually and reasonably incurred by Indemnitee in connection with the Proceeding. No indemnification, hold harmless or exoneration rights shall be available
    under this Section 7.1 on account of Indemnitee’s conduct which constitutes a breach of Indemnitee’s duty of loyalty to the Company or its stockholders or is an act or omission not in good faith or which involves intentional misconduct or a
    knowing violation of the law.

   

  7.2.           Notwithstanding any limitation in Sections 3, 4, 5
    or 7.1, except for Section 27, the Company shall, to the fullest extent permitted by applicable law, indemnify, hold harmless and exonerate Indemnitee if Indemnitee is a party to or threatened to be made a party to any Proceeding
    (including a Proceeding by or in the right of the Company to procure a judgment in its favor) against all Expenses, judgments, fines, penalties and amounts paid in settlement (including all interest, assessments and other charges paid or payable in
    connection with or in respect of such Expenses, judgments, fines, penalties and amounts paid in settlement) actually and reasonably incurred by Indemnitee in connection with the Proceeding.

   

  8.           CONTRIBUTION IN
      THE EVENT OF JOINT LIABILITY.

   

  8.1.           To the fullest extent permissible under applicable law, if the
    indemnification, hold harmless and/or exoneration rights provided for in this Agreement are unavailable to Indemnitee in whole or in part for any reason whatsoever, the Company, in lieu of indemnifying, holding harmless or exonerating Indemnitee, shall
    pay, in the first instance, the entire amount incurred by Indemnitee, whether for judgments, liabilities, fines, penalties, amounts paid or to be paid in settlement and/or for Expenses, in connection with any Proceeding without requiring Indemnitee to
    contribute to such payment, and the Company hereby waives and relinquishes any right of contribution it may have at any time against Indemnitee.

   

  

  
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  8.2.           The Company shall not enter into any settlement of any Proceeding in
    which the Company is jointly liable with Indemnitee (or would be if joined in such Proceeding) unless such settlement provides for a full and final release of all claims asserted against Indemnitee.

   

  8.3.           The Company hereby agrees to fully indemnify, hold harmless and
    exonerate Indemnitee from any claims for contribution which may be brought by officers, directors or employees of the Company other than Indemnitee who may be jointly liable with Indemnitee.

   

  9.           EXCLUSIONS.

   

  Notwithstanding any provision in this Agreement, the Company shall not be obligated under this Agreement to make any indemnification, advance expenses, hold harmless or exoneration
    payment in connection with any claim made against Indemnitee:

   

  (a)             for which payment has actually been received by or on behalf of
    Indemnitee under any insurance policy or other indemnity or advancement provision and which payment has not subsequently been returned, except with respect to any excess beyond the amount actually received under any insurance policy, contract,
    agreement, other indemnity or advancement provision or otherwise;

   

  (b)             for an accounting of profits made from the purchase and sale (or sale
    and purchase) by Indemnitee of securities of the Company within the meaning of Section 16(b) of the Exchange Act (or any successor thereof) or similar provisions of state statutory law or common law; or

   

  (c)             except as otherwise provided in Sections 14.5 and 14.6
    hereof, prior to a Change in Control, in connection with any Proceeding (or any part of any Proceeding) initiated by Indemnitee, including any Proceeding (or any part of any Proceeding) initiated by Indemnitee against the Company or its directors,
    officers, employees or other indemnitees, unless (i) the Board authorized the Proceeding (or any part of any Proceeding) prior to its initiation or (ii) the Company provides the indemnification, hold harmless or exoneration payment, in its sole
    discretion, pursuant to the powers vested in the Company under applicable law.

   

  10.          ADVANCES OF
      EXPENSES; DEFENSE OF CLAIM.

   

  10.1.            Notwithstanding any provision of this Agreement to the contrary
    except for Section 27, and to the fullest extent not prohibited by applicable law, the Company shall pay the Expenses incurred by Indemnitee (or reasonably expected by Indemnitee to be incurred by Indemnitee within three months) in connection
    with any Proceeding within ten (10) days after the receipt by the Company of a statement or statements requesting such advances from time to time, prior to the final disposition of any Proceeding. Advances shall be unsecured and interest free. Advances
    shall be made without regard to Indemnitee’s ability to repay the Expenses and without regard to Indemnitee’s ultimate entitlement to be indemnified, held harmless or exonerated under the other provisions of this Agreement. Advances shall include any
    and all reasonable Expenses incurred pursuing a Proceeding to enforce this right of advancement, including Expenses incurred preparing and forwarding statements to the Company to support the advances claimed. To the fullest extent required by
    applicable law, such payments of Expenses in advance of the final disposition of the Proceeding shall be made only upon the Company’s receipt of an undertaking, by or on behalf of Indemnitee, to repay the advance to the extent that it is ultimately
    determined that Indemnitee is not entitled to be indemnified by the Company under the provisions of this Agreement, the Charter, the Bylaws of the Company, applicable law or otherwise. This Section 10.1 shall not apply to any claim made by
    Indemnitee for which an indemnification, hold harmless or exoneration payment is excluded pursuant to Section 9.

   

  10.2.            The Company will be entitled to participate in the Proceeding at its
    own expense.

   

  

  
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  10.3.            The Company shall not settle any action, claim or Proceeding (in
    whole or in part) which would impose any Expense, judgment, fine, penalty or limitation on Indemnitee without Indemnitee’s prior written consent.

   

  11.          PROCEDURE FOR
      NOTIFICATION AND APPLICATION FOR INDEMNIFICATION.

   

  11.1.            Indemnitee agrees to notify promptly the Company in writing upon
    being served with any summons, citation, subpoena, complaint, indictment, information or other document relating to any Proceeding or matter which may be subject to indemnification, hold harmless or exoneration rights, or advancement of Expenses
    covered hereunder. The failure of Indemnitee to so notify the Company shall not relieve the Company of any obligation which it may have to Indemnitee under this Agreement, or otherwise.

   

  11.2.            Indemnitee may deliver to the Company a written application to
    indemnify, hold harmless or exonerate Indemnitee in accordance with this Agreement. Such application(s) may be delivered from time to time and at such time(s) as Indemnitee deems appropriate in his or her sole discretion. Following such a written
    application for indemnification by Indemnitee, Indemnitee’s entitlement to indemnification shall be determined according to Section 12.1 of this Agreement.

   

  12.          PROCEDURE UPON
      APPLICATION FOR INDEMNIFICATION.

   

  12.1.            A determination, if required by applicable law, with respect to
    Indemnitee’s entitlement to indemnification shall be made in the specific case by one of the following methods, which shall be at the election of Indemnitee: (i) by a majority vote of the Disinterested Directors, even if less than a quorum of the Board
    (ii) by Independent Counsel in a written opinion to the Board, a copy of which shall be delivered to Indemnitee; or (iii) by vote of the stockholders. The Company promptly will advise Indemnitee in writing with respect to any determination that
    Indemnitee is or is not entitled to indemnification, including a description of any reason or basis for which indemnification has been denied. If it is so determined that Indemnitee is entitled to indemnification, payment to Indemnitee shall be made
    within ten (10) days after such determination. Indemnitee shall reasonably cooperate with the person, persons or entity making such determination with respect to Indemnitee’s entitlement to indemnification, including providing to such person, persons
    or entity upon reasonable advance request any documentation or information which is not privileged or otherwise protected from disclosure and which is reasonably available to Indemnitee and reasonably necessary to such determination. Any costs or
    Expenses (including attorneys’ fees and disbursements) incurred by Indemnitee in so cooperating with the person, persons or entity making such determination shall be borne by the Company (irrespective of the determination as to Indemnitee’s entitlement
    to indemnification) and the Company hereby agrees to indemnify and to hold Indemnitee harmless therefrom.

   

  12.2.            In the event the determination of entitlement to indemnification is
    to be made by Independent Counsel pursuant to Section 12.1 hereof, the Independent Counsel shall be selected as provided in this Section 12.2. The Independent Counsel shall be selected by Indemnitee (unless Indemnitee shall request that
    such selection be made by the Board), and Indemnitee shall give written notice to the Company advising it of the identity of the Independent Counsel so selected and certifying that the Independent Counsel so selected meets the requirements of “Independent

        Counsel” as defined in Section 2 of this Agreement. If the Independent Counsel is selected by the Board, the Company shall give written notice to Indemnitee advising him or her of the identity of the Independent Counsel so selected
    and certifying that the Independent Counsel so selected meets the requirements of “Independent Counsel” as defined in Section 2 of this Agreement. In either event, Indemnitee or the Company, as the case may be, may, within ten
    (10) days after such written notice of selection shall have been received, deliver to the Company or to Indemnitee, as the case may be, a written objection to such selection; provided, however, that such objection may be asserted only on the ground
    that the Independent Counsel so selected does not meet the requirements of “Independent Counsel” as defined in Section 2 of this Agreement, and the objection shall set forth with particularity the factual basis of such assertion.
    Absent a proper and timely objection, the person so selected shall act as Independent Counsel. If such written objection is so made and substantiated, the Independent Counsel so selected may not serve as Independent Counsel unless and until such
    objection is withdrawn or a court of competent jurisdiction has determined that such objection is without merit. If, within twenty (20) days after submission by Indemnitee of a written request for indemnification pursuant to Section 11.2
    hereof, no Independent Counsel shall have been selected and not objected to, either the Company or Indemnitee may petition the Delaware Court for resolution of any objection which shall have been made by the Company or Indemnitee to the other’s
    selection of Independent Counsel and/or for the appointment as Independent Counsel of a person selected by the Delaware Court, and the person with respect to whom all objections are so resolved or the person so appointed shall act as Independent
    Counsel under Section 12.1 hereof. Upon the due commencement of any judicial proceeding or arbitration pursuant to Section 14.1 of this Agreement, Independent Counsel shall be discharged and relieved of any further responsibility in
    such capacity (subject to the applicable standards of professional conduct then prevailing).

   

  

  
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  12.3.            The Company agrees to pay the reasonable fees and expenses of
    Independent Counsel and to fully indemnify and hold harmless such Independent Counsel against any and all Expenses, claims, liabilities and damages arising out of or relating to this Agreement or its engagement pursuant hereto.

   

  13.          PRESUMPTIONS AND
      EFFECT OF CERTAIN PROCEEDINGS.

   

  13.1.            In making a determination with respect to entitlement to
    indemnification hereunder, the person, persons or entity making such determination shall presume that Indemnitee is entitled to indemnification under this Agreement if Indemnitee has submitted a request for indemnification in accordance with Section

      11.2 of this Agreement, and the Company shall have the burden of proof to overcome that presumption in connection with the making by any person, persons or entity of any determination contrary to that presumption. Neither the failure of the
    Company (including by its directors or Independent Counsel) to have made a determination prior to the commencement of any action pursuant to this Agreement that indemnification is proper in the circumstances because Indemnitee has met the applicable
    standard of conduct, nor an actual determination by the Company (including by its directors or Independent Counsel) that Indemnitee has not met such applicable standard of conduct, shall be a defense to the action or create a presumption that
    Indemnitee has not met the applicable standard of conduct.

   

  13.2.            If the person, persons or entity empowered or selected under Section

      12 of this Agreement to determine whether Indemnitee is entitled to indemnification shall not have made a determination within thirty (30) days after receipt by the Company of the request therefor, the requisite determination of entitlement to
    indemnification shall be deemed to have been made and Indemnitee shall be entitled to such indemnification, absent (i) a misstatement by Indemnitee of a material fact, or an omission of a material fact necessary to make Indemnitee’s statement not
    materially misleading, in connection with the request for indemnification, or (ii) a final judicial determination that any or all such indemnification is expressly prohibited under applicable law; provided, however, that such 30-day period may be
    extended for a reasonable time, not to exceed an additional fifteen (15) days, if the person, persons or entity making the determination with respect to entitlement to indemnification in good faith requires such additional time for the obtaining or
    evaluating of documentation and/or information relating thereto.

   

  13.3.            The termination of any Proceeding or of any claim, issue or matter
    therein, by judgment, order, settlement or conviction, or upon a plea of nolo contendere or its equivalent, shall not (except as otherwise expressly provided in this Agreement) of itself adversely affect the right of Indemnitee to indemnification or
    create a presumption that Indemnitee did not act in good faith and in a manner which he or she reasonably believed to be in or not opposed to the best interests of the Company or, with respect to any criminal Proceeding, that Indemnitee had reasonable
    cause to believe that his or her conduct was unlawful.

   

  13.4.            For purposes of any determination of good faith, Indemnitee shall be
    deemed to have acted in good faith if Indemnitee’s action is based on the records or books of account of the Enterprise, including financial statements, or on information supplied to Indemnitee by the directors, manager or officers of the Enterprise in
    the course of their duties, or on the advice of legal counsel for the Enterprise, its Board, any committee of the Board or any director, trustee, general partner, manager or managing member, or on information or records given or reports made to the
    Enterprise, its Board, any committee of the Board or any director, trustee, general partner, manager or managing member, by an independent certified public accountant or by an appraiser or other expert selected by the Enterprise, its Board, any
    committee of the Board or any director, trustee, general partner, manager or managing member. The provisions of this Section 13.4 shall not be deemed to be exclusive or to limit in any way the other circumstances in which Indemnitee may be
    deemed or found to have met the applicable standard of conduct set forth in this Agreement.

   

  

  
    8 

    
      
 

  

   

  13.5.            The knowledge and/or actions, or failure to act, of any other
    director, officer, trustee, general partner, manager, managing member, fiduciary, agent or employee of the Enterprise shall not be imputed to Indemnitee for purposes of determining the right to indemnification under this Agreement.

   

  14.          REMEDIES OF
      INDEMNITEE.

   

  14.1.            In the event that (i) a determination is made pursuant to Section

      12 of this Agreement that Indemnitee is not entitled to indemnification under this Agreement, (ii) advancement of Expenses, to the fullest extent permitted by applicable law, is not timely made pursuant to Section 10 of this Agreement,
    (iii) no determination of entitlement to indemnification shall have been made pursuant to Section 12.1 of this Agreement within thirty (30) days after receipt by the Company of the request for indemnification, (iv) payment of indemnification is
    not made pursuant to Sections 5, 6, 7 or the last sentence of Section 12.1 of this Agreement within ten (10) days after receipt by the Company of a written request therefor, (v) a contribution payment is not made in a
    timely manner pursuant to Section 8 of this Agreement, (vi) payment of indemnification pursuant to Section 3 or 4 of this Agreement is not made within ten (10) days after a determination has been made that Indemnitee is entitled
    to indemnification, or (vii) payment to Indemnitee pursuant to any hold harmless or exoneration rights under this Agreement or otherwise is not made in accordance with this Agreement within ten (10) days after receipt by the Company of a written
    request therefor, Indemnitee shall be entitled to an adjudication by the Delaware Court to such indemnification, hold harmless, exoneration, contribution or advancement rights. Alternatively, Indemnitee, at his or her option, may seek an award in
    arbitration to be conducted by a single arbitrator pursuant to the Commercial Arbitration Rules and Mediation Procedures of the American Arbitration Association. Except as set forth herein, the provisions of Delaware law (without regard to its conflict
    of laws rules) shall apply to any such arbitration. The Company shall not oppose Indemnitee’s right to seek any such adjudication or award in arbitration.

   

  14.2.            In the event that a determination shall have been made pursuant to Section

      12.1 of this Agreement that Indemnitee is not entitled to indemnification, any judicial proceeding or arbitration commenced pursuant to this Section 14 shall be conducted in all respects as a de novo trial, or arbitration, on the merits
    and Indemnitee shall not be prejudiced by reason of that adverse determination. In any judicial proceeding or arbitration commenced pursuant to this Section 14, Indemnitee shall be presumed to be entitled to be indemnified, held harmless,
    exonerated to receive advances of Expenses under this Agreement and the Company shall have the burden of proving Indemnitee is not entitled to be indemnified, held harmless, exonerated and to receive advances of Expenses, as the case may be, and the
    Company may not refer to or introduce into evidence any determination pursuant to Section 12.1 of this Agreement adverse to Indemnitee for any purpose. If Indemnitee commences a judicial proceeding or arbitration pursuant to this Section 14,
    Indemnitee shall not be required to reimburse the Company for any advances pursuant to Section 10 until a final determination is made with respect to Indemnitee’s entitlement to indemnification (as to which all rights of appeal have been
    exhausted or lapsed).

   

  14.3.            If a determination shall have been made pursuant to Section 12.1
    of this Agreement that Indemnitee is entitled to indemnification, the Company shall be bound by such determination in any judicial proceeding or arbitration commenced pursuant to this Section 14, absent (i) a misstatement by Indemnitee of a
    material fact, or an omission of a material fact necessary to make Indemnitee’s statement not materially misleading, in connection with the request for indemnification, or (ii) a prohibition of such indemnification under applicable law.

   

  14.4.            The Company shall be precluded from asserting in any judicial
    proceeding or arbitration commenced pursuant to this Section 14 that the procedures and presumptions of this Agreement are not valid, binding and enforceable and shall stipulate in any such court or before any such arbitrator that the Company
    is bound by all the provisions of this Agreement.

   

  14.5.            The Company shall indemnify and hold harmless Indemnitee to the
    fullest extent permitted by law against all Expenses and, if requested by Indemnitee, shall (within ten (10) days after the Company’s receipt of such written request) pay to Indemnitee, to the fullest extent permitted by applicable law, such Expenses
    which are incurred by Indemnitee in connection with any judicial proceeding or arbitration brought by Indemnitee (i) to enforce his or her rights under, or to recover damages for breach of, this Agreement or any other indemnification, hold harmless,
    exoneration, advancement or contribution agreement or provision of the Charter, or the Company’s Bylaws now or hereafter in effect; or (ii) for recovery or advances under any insurance policy maintained by any person for the benefit of Indemnitee,
    regardless of the outcome and whether Indemnitee ultimately is determined to be entitled to such indemnification, hold harmless or exoneration right, advancement, contribution or insurance recovery, as the case may be (unless such judicial proceeding
    or arbitration was not brought by Indemnitee in good faith).

   

  

  
    9 

    
      
 

  

   

  14.6.            Interest shall be paid by the Company to Indemnitee at the legal
    rate under Delaware law for amounts which the Company indemnifies, holds harmless or exonerates, or advances, or is obliged to indemnify, hold harmless or exonerate or advance for the period commencing with the date on which Indemnitee requests
    indemnification, to be held harmless, exonerated, contribution, reimbursement or advancement of any Expenses and ending with the date on which such payment is made to Indemnitee by the Company.

   

  15.          SECURITY.

   

  Notwithstanding anything herein to the contrary except for Section 27, to the extent requested by Indemnitee and approved by the Board, the Company may at any time and from time
    to time provide security to Indemnitee for the Company’s obligations hereunder through an irrevocable bank line of credit, funded trust or other collateral. Any such security, once provided to Indemnitee, may not be revoked or released without the
    prior written consent of Indemnitee.

   

  16.          NON-EXCLUSIVITY;
      SURVIVAL OF RIGHTS; INSURANCE; SUBROGATION.

   

  16.1.            The rights of Indemnitee as provided by this Agreement shall not be
    deemed exclusive of any other rights to which Indemnitee may at any time be entitled under applicable law, the Charter, the Bylaws, any agreement, a vote of stockholders or a resolution of directors, or otherwise. No amendment, alteration or repeal of
    this Agreement or of any provision hereof shall limit or restrict any right of Indemnitee under this Agreement in respect of any Proceeding (regardless of when such Proceeding is first threatened, commenced or completed) arising out of, or related to,
    any action taken or omitted by such Indemnitee in his or her Corporate Status prior to such amendment, alteration or repeal. To the extent that a change in applicable law, whether by statute or judicial decision, permits greater indemnification, hold
    harmless or exoneration rights or advancement of Expenses than would be afforded currently under the Charter, the Bylaws or this Agreement, then this Agreement (without any further action by the parties hereto) shall automatically be deemed to be
    amended to require that the Company indemnify Indemnitee to the fullest extent permitted by law. No right or remedy herein conferred is intended to be exclusive of any other right or remedy, and every other right and remedy shall be cumulative and in
    addition to every other right and remedy given hereunder or now or hereafter existing at law or in equity or otherwise. The assertion or employment of any right or remedy hereunder, or otherwise, shall not prevent the concurrent assertion or employment
    of any other right or remedy.

   

  16.2.            The DGCL, the Charter and the Bylaws permit the Company to purchase
    and maintain insurance or furnish similar protection or make other arrangements including, but not limited to, providing a trust fund, letter of credit, or surety bond (“Indemnification Arrangements”) on behalf of Indemnitee against any
    liability asserted against him or her or incurred by or on behalf of him or her or in such capacity as a director, officer, employee or agent of the Company, or arising out of his or her status as such, whether or not the Company would have the power
    to indemnify him or her against such liability under the provisions of this Agreement or under the DGCL, as it may then be in effect. The purchase, establishment, and maintenance of any such Indemnification Arrangement shall not in any way limit or
    affect the rights and obligations of the Company or of Indemnitee under this Agreement except as expressly provided herein, and the execution and delivery of this Agreement by the Company and Indemnitee shall not in any way limit or affect the rights
    and obligations of the Company or the other party or parties thereto under any such Indemnification Arrangement.

   

  16.3.            To the extent that the Company maintains an insurance policy or
    policies providing liability insurance for directors, officers, trustees, partners, managers, managing members, fiduciaries, employees, or agents of the Company or of any other Enterprise which such person serves at the request of the Company,
    Indemnitee shall be covered by such policy or policies in accordance with its or their terms to the maximum extent of the coverage available for any such director, officer, trustee, partner, managers, managing member, fiduciary, employee or agent under
    such policy or policies. If, at the time the Company receives notice from any source of a Proceeding as to which Indemnitee is a party or a participant (as a witness or otherwise), the Company has director and officer liability insurance in effect, the
    Company shall give prompt notice of such Proceeding to the insurers in accordance with the procedures set forth in the respective policies. The Company shall thereafter take all necessary or desirable action to cause such insurers to pay, on behalf of
    Indemnitee, all amounts payable as a result of such Proceeding in accordance with the terms of such policies.

   

  

  
    10 

    
      
 

  

   

  16.4.            In the event of any payment under this Agreement, the Company shall
    be subrogated to the extent of such payment to all of the rights of recovery of Indemnitee, who shall execute all papers required and take all action necessary to secure such rights, including execution of such documents as are necessary to enable the
    Company to bring suit to enforce such rights.

   

  16.5.            The Company’s obligation to indemnify, hold harmless, exonerate or
    advance expenses hereunder to Indemnitee who is or was serving at the request of the Company as a director, officer, trustee, partner, manager, managing member, fiduciary, employee or agent of any other Enterprise shall be reduced by any amount
    Indemnitee has actually received as indemnification, hold harmless or exoneration payments or advancement of expenses from such Enterprise. Notwithstanding any other provision of this Agreement to the contrary except for Section 27, (i)
    Indemnitee shall have no obligation to reduce, offset, allocate, pursue or apportion any indemnification, hold harmless, exoneration, advancement, contribution or insurance coverage among multiple parties possessing such duties to Indemnitee prior to
    the Company’s satisfaction and performance of all its obligations under this Agreement, and (ii) the Company shall perform fully its obligations under this Agreement without regard to whether Indemnitee holds, may pursue or has pursued any
    indemnification, advancement, hold harmless, exoneration, contribution or insurance coverage rights against any person or entity other than the Company.

   

  17.          DURATION OF
      AGREEMENT.

   

  All agreements and obligations of the Company contained herein shall continue during the period Indemnitee serves as a director or officer of the Company or as a director, officer,
    trustee, partner, manager, managing member, fiduciary, employee or agent of any other corporation, partnership, joint venture, trust, employee benefit plan or other Enterprise which Indemnitee serves at the request of the Company and shall continue
    thereafter so long as Indemnitee shall be subject to any possible Proceeding (including any rights of appeal thereto and any Proceeding commenced by Indemnitee pursuant to Section 14 of this Agreement) by reason of his or her Corporate Status,
    whether or not he or she is acting in any such capacity at the time any liability or expense is incurred for which indemnification or advancement can be provided under this Agreement.

   

  18.          SEVERABILITY.

   

  If any provision or provisions of this Agreement shall be held to be invalid, illegal or unenforceable for any reason whatsoever: (a) the validity, legality and enforceability of the
    remaining provisions of this Agreement (including, without limitation, each portion of any Section, paragraph or sentence of this Agreement containing any such provision held to be invalid, illegal or unenforceable, that is not itself invalid, illegal
    or unenforceable) shall not in any way be affected or impaired thereby and shall remain enforceable to the fullest extent permitted by law; (b) such provision or provisions shall be deemed reformed to the extent necessary to conform to applicable law
    and to give the maximum effect to the intent of the parties hereto; and (c) to the fullest extent possible, the provisions of this Agreement (including, without limitation, each portion of any Section, paragraph or sentence of this Agreement containing
    any such provision held to be invalid, illegal or unenforceable, that is not itself invalid, illegal or unenforceable) shall be construed so as to give effect to the intent manifested thereby.

   

  19.          ENFORCEMENT AND
      BINDING EFFECT.

   

  19.1.            The Company expressly confirms and agrees that it has entered into
    this Agreement and assumed the obligations imposed on it hereby in order to induce Indemnitee to serve as a director, officer or key employee of the Company, and the Company acknowledges that Indemnitee is relying upon this Agreement in serving as a
    director, officer or key employee of the Company.

   

  19.2.            Without limiting any of the rights of Indemnitee under the Charter
    or Bylaws of the Company as they may be amended from time to time, this Agreement constitutes the entire agreement between the parties hereto with respect to the subject matter hereof and supersedes all prior agreements and understandings, oral,
    written and implied, between the parties hereto with respect to the subject matter hereof.

   

  

  
    11 

    
      
 

  

   

  19.3.            The indemnification, hold harmless, exoneration and advancement of
    expenses rights provided by or granted pursuant to this Agreement shall be binding upon and be enforceable by the parties hereto and their respective successors and assigns (including any direct or indirect successor by purchase, merger, consolidation
    or otherwise to all or substantially all of the business or assets of the Company), shall continue as to an Indemnitee who has ceased to be a director, officer, employee or agent of the Company or a director, officer, trustee, general partner, manager,
    managing member, fiduciary, employee or agent of any other Enterprise at the Company’s request, and shall inure to the benefit of Indemnitee and his or her spouse, assigns, heirs, devisees, executors and administrators and other legal representatives.

   

  19.4.            The Company shall require and cause any successor (whether direct or
    indirect by purchase, merger, consolidation or otherwise) to all, substantially all or a substantial part, of the business and/or assets of the Company, by written agreement in form and substance satisfactory to Indemnitee, expressly to assume and
    agree to perform this Agreement in the same manner and to the same extent that the Company would be required to perform if no such succession had taken place.

   

  19.5.            The Company and Indemnitee agree herein that a monetary remedy for
    breach of this Agreement, at some later date, may be inadequate, impracticable and difficult of proof, and further agree that such breach may cause Indemnitee irreparable harm. Accordingly, the parties hereto agree that Indemnitee may enforce this
    Agreement by seeking, among other things, injunctive relief and/or specific performance hereof, without any necessity of showing actual damage or irreparable harm and that by seeking injunctive relief and/or specific performance, Indemnitee shall not
    be precluded from seeking or obtaining any other relief to which he or she may be entitled. The Company and Indemnitee further agree that Indemnitee shall be entitled to such specific performance and injunctive relief, including temporary restraining
    orders, preliminary injunctions and permanent injunctions, without the necessity of posting bonds or other undertaking in connection therewith. The Company acknowledges that in the absence of a waiver, a bond or undertaking may be required of
    Indemnitee by a Court of competent jurisdiction and the Company hereby waives any such requirement of such a bond or undertaking.

   

  20.          MODIFICATION AND
      WAIVER.

   

  No supplement, modification or amendment of this Agreement shall be binding unless executed in writing by the parties hereto. No waiver of any of the provisions of this Agreement shall be
    deemed or shall constitute a waiver of any other provisions of this Agreement nor shall any waiver constitute a continuing waiver.

   

  21.          NOTICES.

   

  All notices, requests, demands and other communications under this Agreement shall be in writing and shall be deemed to have been duly given (i) if delivered by hand and receipted for by
    the party to whom said notice or other communication shall have been directed, on such delivery, or (ii) if mailed by certified or registered mail with postage prepaid, on the third (3rd) business day after the date on which it is so mailed:

   

  (a)           If to Indemnitee, at the address indicated on the signature page of this
    Agreement, or such other address as Indemnitee shall provide in writing to the Company.

   

  (b)           If to the Company, to:

   

  Fortistar Sustainable Solutions Corp. 

  One North Lexington Avenue 

  White Plains, New York 10601

    Attn: Thomas J. Kelly

   

  

  
    12 

    
      
 

  

   

  With a copy, which shall not constitute notice, to:

   

  Weil, Gotshal & Manges LLP

    767 Fifth Avenue

    New York, NY 10153

    Attn: Alexander D. Lynch, Esq.

   

  or to any other address as may have been furnished to Indemnitee in writing by the Company.

   

  22.          APPLICABLE LAW AND
      CONSENT TO JURISDICTION.

   

  This Agreement and the legal relations among the parties shall be governed by, and construed and enforced in accordance with, the laws of the State of Delaware, without regard to its
    conflict of laws rules. Except with respect to any arbitration commenced by Indemnitee pursuant to Section 14.1 of this Agreement, the Company and Indemnitee hereby irrevocably and unconditionally: (a) agree that any action or proceeding
    arising out of or in connection with this Agreement shall be brought only in the Delaware Court and not in any other state or federal court in the United States of America or any court in any other country; (b) consent to submit to the exclusive
    jurisdiction of the Delaware Court for purposes of any action or proceeding arising out of or in connection with this Agreement; (c) waive any objection to the laying of venue of any such action or proceeding in the Delaware Court; and (d) waive, and
    agree not to plead or to make, any claim that any such action or proceeding brought in the Delaware Court has been brought in an improper or inconvenient forum, or is subject (in whole or in part) to a jury trial.

   

  23.          IDENTICAL
      COUNTERPARTS.

   

  This Agreement may be executed in one or more counterparts, each of which shall for all purposes be deemed to be an original but all of which together shall constitute one and the same
    Agreement. Only one such counterpart signed by the party against whom enforceability is sought needs to be produced to evidence the existence of this Agreement.

   

  24.          MISCELLANEOUS.

   

  The headings of the paragraphs of this Agreement are inserted for convenience only and shall not be deemed to constitute part of this Agreement or to affect the construction thereof.

   

  25.          PERIOD OF
      LIMITATIONS.

   

  No legal action shall be brought and no cause of action shall be asserted by or in the right of the Company against Indemnitee, Indemnitee’s spouse, heirs, executors or personal or legal
    representatives after the expiration of two years from the date of accrual of such cause of action, and any claim or cause of action of the Company shall be extinguished and deemed released unless asserted by the timely filing of a legal action within
    such two-year period; provided, however, that if any shorter period of limitations is otherwise applicable to any such cause of action such shorter period shall govern.

   

  26.          ADDITIONAL ACTS.

   

  If for the validation of any of the provisions in this Agreement any act, resolution, approval or other procedure is required, the Company undertakes to cause such act, resolution,
    approval or other procedure to be affected or adopted in a manner that will enable the Company to fulfill its obligations under this Agreement.

   

  27.          WAIVER OF CLAIMS
      TO TRUST ACCOUNT.

   

  Indemnitee hereby agrees that it does not have any right, title, interest or claim of any kind (each, a “Claim”) in or to any monies in the trust account
    established in connection with the Company’s initial public offering for the benefit of the Company and holders of shares issued in such offering, and hereby waives any Claim it may have in the future as a result of, or arising out of, any services
    provided to the Company and will not seek recourse against such trust account for any reason whatsoever.

   

  

  
    13 

    
      
 

  

   

  [SIGNATURE PAGE FOLLOWS]

   

  
    14 

    
      
 

  

   

  IN WITNESS WHEREOF, the parties hereto have caused this Indemnity Agreement to be signed as of the day and year first above written.

   

  

  	 	FORTISTAR SUSTAINABLE SOLUTIONS CORP.
	 	 	 
	 	By:	 
	 	 	Name:
	 	 	Title:
	 	 	 
	 	INDEMNITEE:
	 	 	 
	 	By:	 
	 	 	Name:
	 	 	Title:

   

  15Exhibit 10.8

    

    

      

      

      Fortistar Sustainable Solutions Corp.

      One North Lexington Avenue

      White Plains, NY 10601

       

      

       [●], 2021

       

      

      FSSC Sponsor LLC

      One North Lexington Avenue

      White Plains, New York 10601

       

      

      Re: Administrative Services Agreement

       

      

      Ladies and Gentlemen:

       

      

      This letter agreement by and between Fortistar Sustainable Solutions Corp. (the “Company”) and our sponsor, FSSC Sponsor LLC (“FSSC”), dated as of the date hereof,
        will confirm our agreement that, commencing on the date the securities of the Company are first listed on the Nasdaq Capital Market (the “Listing Date”), pursuant to a Registration Statement on Form S-1 and prospectus filed with the Securities and
        Exchange Commission (the “Registration Statement”) and continuing until the earlier of the consummation by the Company of an initial business combination or the Company’s liquidation (in each case as described in the Registration Statement)
        (such earlier date hereinafter referred to as the “Termination Date”):

       

      

      (i) FSSC shall make available to the Company, at One North Lexington Avenue, White Plains, New York 10601 (or any successor location), certain office space, utilities and
        secretarial and administrative support as may be reasonably required by the Company. In exchange therefor, the Company shall pay FSSC the sum of $10,000 per month on the Listing Date and continuing monthly thereafter until the Termination Date; and

       

      

      (ii) FSSC hereby irrevocably waives any and all right, title, interest, causes of action and claims of any kind as a result of, or arising out of, this letter agreement
        (each, a “Claim”) in or to, and any and all right to seek payment of any amounts due to it out of, the trust account established for the benefit of the public stockholders of the Company and into which substantially all of the proceeds of the
        Company’s initial public offering will be deposited (the “Trust Account”), and hereby irrevocably waives any Claim it may have in the future, which Claim would reduce, encumber or otherwise adversely affect the Trust Account or any monies or other
        assets in the Trust Account, and further agrees not to seek recourse, reimbursement, payment or satisfaction of any Claim against the Trust Account or any monies or other assets in the Trust Account for any reason whatsoever.

       

      

      This letter agreement constitutes the entire agreement and understanding of the parties hereto in respect of its subject matter 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 amended, modified or waived as to any particular provision, except by a written instrument executed by the parties hereto.

       

      

      No party hereto may assign either this letter agreement or any of its rights, interests, or obligations hereunder without the prior written approval of the other party. 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 constitutes the entire relationship of the parties hereto, and any litigation between the parties (whether grounded in contract, tort, statute, law or
        equity) shall be governed by, construed in accordance with, and interpreted pursuant to the laws of the State of New York, without giving effect to its choice of laws principles.

       

      

      [Signature Page Follows]

      
        
          

      

      	
              

              

            	
              Very truly yours,

            
	 	 
	
              

              

            	
              FORTISTAR SUSTAINABLE SOLUTIONS CORP.

            
	 	 
	

            	By

            	

            
	

            	Name:

            	
              Nadeem Nisar

            
	

            	
              Title:

              

            	
              Chief Executive Officer and Director

            
	
               

            	 
	 	 
	 	 
	
              AGREED TO AND ACCEPTED BY:

            	 
	 	 
	
              FSSC SPONSOR LLC

            	 
	 	 
	
              By:

            	

            	 	 
	
              Name:

            	 
	
              Title:

            	 

      

      

      
        [Signature Page to Administrative Services Agreement]

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