Document:

EX-10.1

 Exhibit 10.1 
  

SPONSOR SUPPORT AGREEMENT 

THIS SPONSOR SUPPORT AGREEMENT (this “Sponsor Agreement”) is dated as of July 12, 2021, by and among CBRE
Acquisition Sponsor, LLC, a Delaware limited liability company (the “Sponsor”), the other Persons set forth on Schedule I hereto (together with the Sponsor, each, a “Sponsor Party” and, together, the
“Sponsor Parties”), CBRE Acquisition Holdings, Inc., a Delaware corporation (“CBAH”), and Altus Power, Inc., a Delaware corporation (the “Company”). Capitalized terms used but not defined herein
shall have the respective meanings ascribed to such terms in the Business Combination Agreement (as defined below). 
 RECITALS 

WHEREAS, as of the date hereof, the Sponsor Parties collectively are the holders of record and the “beneficial
owners” (within the meaning of Rule 13d-3 under the Exchange Act) of 1,932,000 shares of CBAH Class B Common Stock (such shares, the “Subject Shares”) and 7,292,999 Private Placement
Warrants (such warrants, the “Subject Warrants”) in the aggregate as set forth on Schedule I attached hereto; 

WHEREAS, concurrently with the execution and delivery of this Sponsor Agreement, the Company, CBAH, CBAH Merger Sub I,
Inc., a Delaware corporation and a direct, wholly-owned Subsidiary of CBAH (“First Merger Sub”), CBAH Merger Sub II, LLC, a Delaware limited liability company and a direct, wholly-owned Subsidiary of CBAH (“Second Merger
Sub”), Altus Power America Holdings, LLC, a Delaware limited liability company (“Holdings”) and APAM Holdings LLC, a Delaware limited liability company (“APAM”) have entered into that certain Business
Combination Agreement (as amended, restated, amended and restated, supplemented or otherwise modified from time to time, the “Business Combination Agreement”), dated as of the date hereof, pursuant to which, on the terms and
conditions set forth therein, among other transactions, (i) First Merger Sub is to merge with and into the Company, with the Company continuing on as the surviving entity and a wholly-owned Subsidiary of CBAH, and (ii) the Company is to
merge with and into Second Merger Sub, with Second Merger Sub continuing on as the surviving entity and a wholly-owned Subsidiary of CBAH; 

WHEREAS, as a condition and inducement to the Company’s willingness to enter into the Business Combination
Agreement and to consummate the transactions contemplated therein, CBAH and the Sponsor have agreed to enter into the Sponsor Subscription Agreement and to consummate the transactions contemplated therein, pursuant to which, on the terms and
conditions set forth therein, the Sponsor shall subscribe for and purchase from CBAH, and CBAH shall issue and sell to the Sponsor, a number of shares of CBAH Class A Common Stock equal to $70,000,000 plus the Backstop Amount (as defined in the
Sponsor Subscription Agreement), if any, divided by $10.00, in each case after giving effect to rounding to eliminate the purchase or issuance of partial shares of CBAH Class A Common Stock; and 

WHEREAS, as an inducement to CBAH and the Company to enter into the Business Combination Agreement and to consummate
the transactions contemplated therein, the parties hereto desire to agree to certain matters as set forth herein. 

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 

SPONSOR SUPPORT AGREEMENT; COVENANTS 

1.1 Binding Effect of Business Combination Agreement. Each Sponsor Party hereby acknowledges that it has read the
Business Combination Agreement and this Sponsor Agreement and has had the opportunity to consult with its tax and legal advisors. Each Sponsor Party shall be bound by and comply with Section 7.08 (Exclusivity) and Section 8.05
(Confidentiality; Publicity) of the Business Combination Agreement (and any relevant definitions contained in any such Sections) as if (a) such Sponsor Party was an original signatory to the Business Combination Agreement with
respect to such provisions and (b) each reference to “CBAH” contained in Section 7.08 (Exclusivity) and Section 8.05 (Confidentiality; Publicity) of the Business Combination Agreement also referred to
each such Sponsor Party. 
 1.2 No Transfer. 

(a) During the period commencing on the date hereof and ending on the earlier of (i) the Second Effective Time and
(ii) such date and time as the Business Combination Agreement shall be terminated in accordance with Section 10.01 thereof (the earlier of (i) and (ii), the “Expiration Time”), each Sponsor Party shall not Transfer
(as defined below) any CBAH Common Stock or CBAH Warrants, in each case except pursuant to a Permitted Transfer (as defined below). 

(b) “Permitted Transfer” means any Transfer of shares of CBAH Common Stock, CBAH Warrants or other equity
securities of CBAH Common Stock to (i) for any Sponsor Party, (A) any Affiliate of such Sponsor Party or (B) any other Sponsor Party or any Person to which such other Sponsor Party may make a Permitted Transfer or (ii) for a
Sponsor Party who is an individual (A) by gift to (x) a spouse, child, grandchild, parent, grandparent or sibling, including by adoption or in-law (each, a “Family Member”) of such
individual, (y) a trust, family foundation or other estate planning vehicle, the beneficiary or beneficiaries of which are such individual or one or more of such individual’s Family Members or (z) a charitable organization or
(B) by virtue of laws of descent and distribution upon death of such individual; provided, however, that, in the case of (i) and (ii), any such transferee must enter into a written agreement with the Company agreeing to be
bound by this Sponsor Agreement as a Sponsor Party hereunder prior to the effectiveness of such Transfer. 
 (c)
“Transfer” shall mean, with respect to any Person, (A) the sale or assignment of, offer to sell, contract or agreement to sell, hypothecate, pledge, grant of any option to purchase or otherwise dispose of or agreement to
dispose of, directly or indirectly, or establishment or increase of a put equivalent position or liquidation with respect to or decrease of a call equivalent position within the meaning of Section 16 of the Exchange Act, in each case with
respect to any security owned, including ownership of record or the power to vote (including, without limitation, by proxy or power of attorney), by such Person, (B) the entry into any swap or other arrangement that transfers to another Person,
in whole or in part, any of the economic consequences of ownership of any security owned by such Person, whether any such transaction is to be settled by delivery of such securities, in cash or otherwise, or (C) the public announcement of any
intention to effect any transaction specified in clause (A) or (B). 
 1.3 New Shares. In the event that
(a) any CBAH Common Stock, CBAH Warrants or other equity securities of CBAH are issued to a Sponsor Party after the date of this Sponsor Agreement pursuant to any stock dividend or distribution, stock split, recapitalization, reclassification,
combination, conversion, exercise or exchange of CBAH Common Stock or CBAH Warrants of, on or affecting the CBAH Common Stock or CBAH Warrants owned by such Sponsor Party or (b) a Sponsor Party purchases or otherwise acquires beneficial
ownership of any CBAH Common Stock, CBAH Warrants or other equity securities of CBAH after the date of this Sponsor Agreement and prior to the Closing (such CBAH Common Stock, 

  
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CBAH Warrants or other equity securities of CBAH, collectively the “New Securities”), then such New Securities acquired or purchased by such Sponsor Party shall be subject to the
terms of this Sponsor Agreement to the same extent as if they constituted the CBAH Common Stock or CBAH Warrants owned by such Sponsor Party as of the date hereof. 

1.4 Sponsor Agreements. 

(a) During the period commencing on the date hereof and ending at the Expiration Time, at any meeting of the stockholders of
CBAH, however called, or at any adjournment thereof, and in any action by written consent of the stockholders of CBAH, or in any other circumstance in which the vote, consent or other approval of the stockholders of CBAH is sought, each Sponsor
Party shall (i) appear at each such meeting or otherwise cause all of its CBAH Common Stock to be counted as present thereat for purposes of calculating a quorum and (ii) vote (or cause to be voted), or execute and deliver a written
consent (or cause a written consent to be executed and delivered) covering, all of its CBAH Common Stock (including all of such Sponsor Party’s Subject Shares, to the extent applicable): 

(i) in favor of, and to approve and adopt, the Proposals; 

(ii) against any Business Combination Proposal or any proposal relating to a Business Combination Proposal, in each case,
other than the Transaction Proposal; 
 (iii) against any merger agreement, merger, consolidation, combination, sale of
substantial assets, reorganization, recapitalization, dissolution, liquidation or winding up of or by CBAH (other than the Business Combination Agreement or the Ancillary Agreements and the transactions contemplated thereby); 

(iv) against any change in the business, management or board of directors of CBAH (other than in connection with the
Proposals or pursuant to the Business Combination Agreement or the Ancillary Agreements or the transactions contemplated thereby); and 

(v) against any proposal, action or agreement that would reasonably be expected to (a) impede, frustrate, prevent or
nullify any provision of this Sponsor Agreement, the Business Combination Agreement or the Mergers, (b) result in a breach of any covenant, representation, warranty or any other obligation or agreement of CBAH under the Business Combination
Agreement, (c) result in a breach of any covenant, representation, warranty or any other obligation or agreement of any Sponsor Party under this Sponsor Agreement, (d) result in any of the conditions set forth in Article IX of the
Business Combination Agreement not being fulfilled or (e) change in any manner the dividend policy or capitalization of, including the voting rights of, any class of capital stock or other securities of CBAH (other than, in the case of this
clause (e), pursuant to the Business Combination Agreement or the Ancillary Agreements and the transactions contemplated thereby). 
 During
the period commencing on the date hereof and ending upon the termination of this Sponsor Agreement in accordance with Section 3.1, each Sponsor Party hereby agrees that it shall not commit, agree, or publicly propose any
intention to take any action inconsistent with the foregoing. 
 (b) The obligations of each Sponsor Party hereunder shall
apply whether or not the CBAH Board or the CBAH Special Committee recommends any of the Proposals and whether or not the CBAH Board or the CBAH Special Committee changes, withdraws, withholds, qualifies or modifies, or publicly proposes to change,
withdraw, withhold, qualify or modify, any such recommendation. 

  
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 (c) Each Sponsor Party irrevocably and unconditionally hereby agrees that
such Sponsor Party shall not elect to redeem or otherwise tender or submit for redemption any CBAH Class A Common Stock it may hold or hereafter acquire prior to the Second Effective Time pursuant to or in connection with the Offer or otherwise
in connection with the Transactions. 
 (d) Each of CBAH and the Sponsor acknowledges and agrees that (i) the Sponsor
Subscription Agreement, dated on or around the date hereof, is being entered into in order to induce the Company to execute and deliver the Business Combination Agreement and without the representations, warranties, covenants and agreements of CBAH
and the Sponsor thereunder, the Company would not enter into the Business Combination Agreement, (ii) each representation, warranty, covenant and agreement of CBAH and the Sponsor thereunder is being made also for the benefit of the Company,
and (iii) the Company may seek to directly enforce (including by an action for specific performance, injunctive relief or other equitable relief, including to cause the Backstop Amount (as defined in the Sponsor Subscription Agreement) to be
paid and the Closing to occur) each of the covenants and agreements of each of CBAH and the Sponsor under the Sponsor Subscription Agreement. 

(e) During the period commencing on the date hereof and ending upon the termination of this Sponsor Agreement in accordance
with Section 3.1, each Sponsor Party shall not modify or amend any Contract between or among such Sponsor Party, anyone related by blood, marriage or adoption to such Sponsor Party or any Affiliate of such Sponsor Party
(other than CBAH), on the one hand, and CBAH, on the other hand without the prior written consent of the Company. 
 1.5
No Challenges. During the period commencing on the date hereof and ending upon the termination of this Sponsor Agreement in accordance with Section 3.1, each Sponsor Party agrees not to commence, join in, facilitate,
assist or encourage, and agrees to take all actions within its power necessary to opt out of any class in any class action with respect to, any claim, derivative or otherwise, against CBAH, First Merger Sub, Second Merger Sub, the Company, the
Company’s Affiliates or any of their respective successors, assigns or directors (except in any case arising out of the fraud of any such parties) (a) challenging the validity of, or seeking to enjoin the operation of, any provision of
this Sponsor Agreement or the Business Combination Agreement or (b) alleging a breach of any fiduciary duty of any Person in connection with the evaluation, negotiation or entry into the Business Combination Agreement. Notwithstanding the
foregoing, nothing herein shall be deemed to prohibit such Sponsor Party from enforcing such Sponsor Party’s rights under this Sponsor Agreement and the other agreements entered into by such Sponsor Party in connection herewith, or otherwise in
connection with the Mergers or the other transactions contemplated by the Business Combination Agreement. 
 1.6 Further
Assurances. Each Sponsor Party shall execute and deliver, or cause to be executed and delivered, such additional documents, and shall use commercially reasonable efforts to take, or cause to be taken, all such further actions and do, or cause to
be done, all things reasonably necessary or reasonably requested (including under applicable Laws) to effect the actions required to consummate the Mergers and the other transactions contemplated by this Sponsor Agreement and the Business
Combination Agreement, in each case, on the terms and subject to the conditions set forth therein and herein, as applicable. 

1.7 No Inconsistent Agreement. Each Sponsor Party hereby covenants and agrees that such Sponsor Party shall not
(a) enter into any voting agreement or voting trust with respect to any of the Subject Shares or Subject Warrants that is inconsistent with such Sponsor Party’s obligations pursuant to this Sponsor Agreement, (b) grant a proxy or
power of attorney with respect to any of such Sponsor Party’s Subject Shares or Subject Warrants that is inconsistent with such Sponsor Party’s obligations pursuant to this Sponsor Agreement, and (c) enter into any agreement or
undertaking that is otherwise inconsistent 

  
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with, or would restrict, limit or interfere with, the performance of such Sponsor Party’s obligations hereunder. 

1.8 Consent to Disclosure. Each Sponsor Party hereby consents to the publication and disclosure in any announcement or
disclosure required by applicable securities Laws, the SEC or any other securities authorities of such Sponsor Party’s identity and ownership of the Subject Shares and Subject Warrants and the nature of such Sponsor Party’s obligations
under this Sponsor Agreement; provided that, prior to any such publication or disclosure the Company and CBAH have provided such Sponsor Party with an opportunity to review and comment upon such announcement or disclosure, which comments the
Company and CBAH will consider in good faith; provided, further, that the foregoing proviso shall not apply to any such publication or disclosure the content of which concerning the foregoing does not substantially differ from any
prior such publication or disclosure. Each Sponsor Party shall promptly provide any information reasonably requested by CBAH or the Company for any regulatory application or filing made or approval sought in connection with the transactions
contemplated by the Business Combination Agreement, which approval or filing is specifically set forth in the Business Combination Agreement (including filings with the SEC), except for any information that is subject to attorney-client privilege or
confidentiality obligations (provided, that with respect to any confidentiality obligations, (a) such Sponsor Party shall use its commercially reasonable efforts to obtain a waiver of any such confidentiality obligations and
(b) such Sponsor Party, CBAH and the Company shall cooperate in good faith to enable disclosure of such information to the maximum extent possible in a manner that complies with such confidentiality obligation). 

1.9 No Agreement as Director or Officer. Notwithstanding any provision of this Sponsor Agreement to the contrary, each
Sponsor Party is signing this Sponsor Agreement solely in its capacity as a stockholder of CBAH. No Sponsor Party makes any agreement or understanding in this Sponsor Agreement in such Sponsor Party’s capacity (or in the capacity of any
Affiliate, partner, manager, director, officer, member, equityholder or employee of such Sponsor Party) as a director, officer or employee of CBAH (if applicable) or in any Sponsor Party’s capacity (or in the capacity of any Affiliate, partner,
manager, director, officer, member, equityholder or employee of such Sponsor Party) as a trustee or fiduciary of any employee benefit plan or trust. Nothing in this Sponsor Agreement will be construed to prohibit, limit or restrict a Sponsor Party
from exercising his or her fiduciary duties as an officer or director to CBAH or its equityholders. 
 ARTICLE II 

REPRESENTATIONS AND WARRANTIES 

2.1 Representations and Warranties of the Sponsor Parties. Each Sponsor Party represents and warrants as of the date
hereof to CBAH and the Company (solely with respect to itself, himself or herself and not with respect to any other Sponsor Party) as follows: 

(a) Organization; Due Authorization. 

(i) If such Sponsor Party is not an individual, it is duly organized, validly existing and in good standing under the Laws of
the jurisdiction in which it is incorporated, formed, organized or constituted, and the execution, delivery and performance of this Sponsor Agreement and the consummation of the transactions contemplated hereby are within such Sponsor Party’s
corporate, limited liability company or organizational powers and have been duly authorized by all necessary corporate, limited liability company or organizational actions on the part of such Sponsor Party. If such Sponsor Party is an individual,
such Sponsor Party has full legal capacity, right and authority to execute and deliver this Sponsor Agreement and to perform his or her obligations hereunder. This Sponsor Agreement has been duly executed and delivered by such Sponsor Party and,
assuming due authorization, execution and delivery 

  
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by the other parties to this Sponsor Agreement, this Sponsor Agreement constitutes a legally valid and binding obligation of such Sponsor Party, enforceable against such Sponsor Party in
accordance with the terms hereof, subject to applicable bankruptcy, insolvency, fraudulent conveyance, reorganization, moratorium and other similar Laws affecting creditors’ rights generally and subject, as to enforceability, to general
principles of equity. If this Sponsor Agreement is being executed in a representative or fiduciary capacity, the Person signing this Sponsor Agreement has full power and authority to enter into this Sponsor Agreement on behalf of the applicable
Sponsor Party; and 
 (ii) Other than the filings, notices and reports pursuant to, in compliance with or required to be
made under the Exchange Act or in connection with the Business Combination Agreement, no filings, notices, reports, consents, registrations, approvals, permits, waivers, expirations of waiting periods or authorizations are required to be obtained by
such Sponsor Party from, or to be given by such Sponsor Party to, or be made by such Sponsor Party with, any Governmental Authority in connection with the execution, delivery and performance by such Sponsor Party of this Sponsor Agreement, the
consummation of the transactions contemplated hereby or the Mergers and the other transactions contemplated by the Business Combination Agreement, as applicable. 

(b) Ownership. Such Sponsor Party is the record and “beneficial owner” (within the meaning of Rule 13d-3 of the Exchange Act) of, and has good, valid and marketable title to, all of such Sponsor Party’s Subject Shares and Subject Warrants, and there exist no Liens or any other limitation or
restriction (including any restriction on the right to vote, sell or otherwise dispose of such Subject Shares or Subject Warrants (other than transfer restrictions under the Securities Act)) affecting any such Subject Shares or Subject Warrants,
other than Liens pursuant to (i) this Sponsor Agreement, (ii) the CBAH Organizational Documents, (iii) the Business Combination Agreement or (iv) any applicable securities Laws. Such Sponsor Party’s Subject Shares and
Subject Warrants are the only equity securities of CBAH owned of record or beneficially by such Sponsor Party as of the date hereof, and none of such Sponsor Party’s Subject Shares or Subject Warrants are subject to any proxy, voting trust or
other agreement, arrangement or undertaking that is inconsistent with, or would restrict, limit or interfere with, the performance of such Sponsor Party’s obligations hereunder. Other than the Subject Warrants, such Sponsor Party does not hold
or own any rights to acquire (directly or indirectly) any equity securities of CBAH or any securities convertible into, or which can be exchanged for, equity securities of CBAH. 

(c) No Conflicts. The execution and delivery of this Sponsor Agreement by such Sponsor Party does not, the performance
by such Sponsor Party of his, her or its obligations hereunder will not, and the consummation of the transactions contemplated hereby or the Mergers and the other transactions contemplated by the Business Combination Agreement will not, (i) if
such Sponsor Party is not an individual, conflict with or result in a breach or violation of the organizational documents of such Sponsor Party, (ii) constitute or result in, with or without notice, lapse of time or both, a breach or violation
of, a termination (or right of termination) of or a default under, the loss of any benefit under, the creation, modification or acceleration of any obligations under or the creation of a Lien on any of the properties, rights or assets of such
Sponsor Party pursuant to any Contract binding upon such Sponsor Party or, assuming (solely with respect to performance of this Sponsor Agreement and the transactions contemplated hereby), compliance with the matters referred to in
Section 2.1(a)(ii), under any applicable Law to which the Sponsor Party is subject, (iii) result in any change in the rights or obligations of any party under any Contract legally binding upon such Sponsor Party; or
(iv) require any consent or approval that has not been given or other action that has not been taken by any Person (including under any Contract binding upon such Sponsor Party or such Sponsor Party’s Subject Shares or Subject Warrants),
in each case, to the extent such consent, approval or other action would prevent, enjoin or materially delay the performance by such Sponsor Party of its, his or her obligations under this Sponsor Agreement, except, in the case of clauses
(ii) and (iii) directly above, for any such breach, violation, termination, default, creation, acceleration, lien or change that would not, individually or in the aggregate, reasonably be expected to prevent, enjoin or

  
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materially delay or impair such Sponsor Party’s ability to perform its obligations hereunder or to consummate the transactions contemplated hereby, the consummation of the Mergers or the
other transactions contemplated by the Business Combination Agreement. 
 (d) Litigation. There are no Actions or
investigations pending against such Sponsor Party or, to the knowledge of such Sponsor Party, threatened against such Sponsor Party, before (or, in the case of threatened Actions, that would be before) any Governmental Authority, which in any manner
challenges or seeks to prevent, enjoin or materially delay the performance by such Sponsor Party of its, his or her obligations under this Sponsor Agreement. 

(e) Brokerage Fees. Except as described on Section 5.10 of the CBAH Schedules, no broker, finder, investment
banker or other Person is entitled to any brokerage fee, finders’ fee or other commission (including any deferred underwriting commission) in connection with the transactions contemplated by the Business Combination Agreement (including the
Equity Financing) or as a result of the Closing, in each case, including based upon arrangements made by such Sponsor Party, for which CBAH or any of its Affiliates may become liable. 

(f) Affiliate Arrangements. Except as set forth on Schedule II attached hereto, neither such Sponsor Party nor,
if such Sponsor Party is an individual, anyone related by blood, marriage or adoption to such Sponsor Party or, to the knowledge of such Sponsor Party, any Person in which such Sponsor Party has a direct or indirect legal, contractual or beneficial
ownership of 5% or greater, or any Affiliate, director, officer or manager (or equivalents), or other employee of such Sponsor Party, is party to, or has any rights with respect to or arising from, any Contract with CBAH or its Subsidiaries. 

(g) Acknowledgment. Such Sponsor Party understands and acknowledges that each of CBAH and the Company is entering into
the Business Combination Agreement in reliance upon such Sponsor Party’s execution and delivery of this Sponsor Agreement and the representations, warranties, covenants and other agreements of such Sponsor Party contained herein. 

(h) No Other Representations or Warranties. Except for the representations and warranties made by each Sponsor Party
(solely with respect to itself, himself or herself and not with respect to any other Sponsor Party) in this Article II and in other Ancillary Agreements, no Sponsor Party nor any other Person makes any express or implied representation or
warranty to CBAH or the Company in connection with this Sponsor Agreement or the transactions contemplated by this Sponsor Agreement, and each Sponsor Party expressly disclaims any such other representations or warranties. 

ARTICLE III 

MISCELLANEOUS 

3.1 Termination. This Sponsor Agreement and all of its provisions shall terminate and be of no further force or effect
upon the earlier of (a) the Expiration Time and (b) the written agreement of the Sponsor, CBAH, and the Company to terminate this Sponsor Agreement; provided that if the Closing occurs, Section 1.5 (and this
Article III) shall survive the Closing in accordance with its terms. Upon such termination of this Sponsor Agreement, all obligations of the parties under this Sponsor Agreement will terminate, without any liability or other obligation on the part
of any party hereto to any Person in respect hereof or the transactions contemplated hereby, and no party hereto shall have any claim against another (and no Person shall have any rights against such party), whether under contract, tort or
otherwise, pursuant to this Sponsor Agreement; provided, however, that the termination of this Sponsor Agreement shall not relieve any party hereto from liability arising in respect of such party’s Willful Breach of this Sponsor
Agreement prior to such termination, provided, further, if the Closing occurs, Section 1.5 (and this Article III) shall survive the Closing in accordance with its terms. 

  
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 3.2 Governing Law; Jurisdiction. This Sponsor Agreement and
all claims or causes of action based upon, arising out of, or related to this Sponsor Agreement or the transactions contemplated hereby, shall be governed by, and construed in accordance with, the Laws of the State of Delaware without giving effect
to principles or rules of conflict of laws to the extent such principles or rules would require or permit the application of Laws of another jurisdiction. Any Action based upon, arising out of or related to this Sponsor Agreement, or the
transactions contemplated hereby, shall only be brought in the Delaware Court of Chancery (or, only if the Delaware Court of Chancery declines to accept jurisdiction over a particular matter, the Delaware Supreme Court or the United States District
Court for the District of Delaware), and any appellate court from any thereof, and each of the parties irrevocably submits to the exclusive jurisdiction of each such court in any such Action, waives any objection it may now or hereafter have to
personal jurisdiction, venue or to convenience of forum, agrees that all claims in respect of the Action shall be heard and determined only in any such court, and agrees not to bring any Action arising out of or relating to this Sponsor Agreement or
the transactions contemplated hereby in any other court. Nothing herein contained shall be deemed to affect the right of any party to serve process in any manner permitted by Law, or to commence legal proceedings or otherwise proceed against any
other party in any other jurisdiction, in each case, to enforce judgments obtained in any Action brought pursuant to this Section 3.2. EACH OF THE PARTIES HERETO HEREBY IRREVOCABLY WAIVES ANY AND ALL RIGHT TO TRIAL BY JURY
IN ANY ACTION BASED UPON, ARISING OUT OF OR RELATED TO THIS SPONSOR AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY. 

3.3 Assignment. This Sponsor Agreement and all of the provisions hereof will be binding upon, inure to the benefit of
and be enforceable by the parties hereto and their respective heirs, successors and permitted assigns. Neither this Sponsor Agreement nor any of the rights, interests or obligations hereunder shall be assigned by any of the parties hereto in whole
or in part (whether by operation of Law or otherwise) without the prior written consent of each of the other parties hereto, and any such assignment without such consent shall be null and void. 

3.4 Specific Performance. The parties hereto agree that irreparable damage for which monetary damages, even if
available, would not be an adequate remedy, would occur in the event that the parties hereto do not perform their obligations under the provisions of this Sponsor Agreement in accordance with its specified terms or otherwise breach or threaten to
breach such provisions. The parties hereto acknowledge and agree that (i) the parties hereto shall be entitled to an injunction, specific performance, or other equitable relief, to prevent breaches or threatened breaches of this Sponsor
Agreement and to enforce specifically the terms and provisions hereof, without proof of damages, prior to the valid termination of this Sponsor Agreement in accordance with Section 3.1, this being, in addition to any other
remedy to which they are entitled under this Sponsor Agreement, and (ii) the right of specific enforcement is an integral part of the transactions contemplated by this Sponsor Agreement and without that right, none of the parties hereto would
have entered into this Sponsor Agreement. Each of the parties hereto agrees that it shall not oppose the granting of an injunction, specific performance and other equitable relief on the basis that the other parties hereto have an adequate remedy at
law or that an award of specific performance is not an appropriate remedy for any reason at law or in equity. Any party hereto seeking an order or injunction to prevent breaches or threatened breaches of this Sponsor Agreement and to enforce
specifically the terms and provisions of this Sponsor Agreement in accordance with this Section 3.4 shall not be required to provide any bond or other security in connection with any such order or injunction. 

3.5 Amendment; Waiver. This Sponsor Agreement may not be amended, supplemented or otherwise modified, and no
provision of this Sponsor Agreement may be waived, except upon the execution and delivery of a written agreement executed by CBAH, the Company and the Sponsor and, if such amendment, supplement, modification or waiver adversely affects any other
Sponsor Party, such Sponsor Party. No single or partial exercise of any right, power or privilege hereunder will preclude any other or further exercise thereof or the exercise of any other right, power or privilege. The rights and remedies of

  
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the parties hereto hereunder are cumulative and are not exclusive of any rights or remedies which they would otherwise have hereunder. 

3.6 Severability. If any provision of this Sponsor Agreement is held invalid or unenforceable by any court of competent
jurisdiction, the other provisions of this Sponsor Agreement will remain in full force and effect. Any provision of this Sponsor Agreement held invalid or unenforceable only in part or degree will remain in full force and effect to the extent not
held invalid or unenforceable. 
 3.7 Notices. All notices and other communications under this Sponsor Agreement
shall be in writing and shall be deemed given (a) when delivered personally by hand (with written confirmation of receipt by other than automatic means, whether electronic or otherwise), (b) when sent by email (with no automated reply, such as
an out-of-office notification, no mail undeliverable notification or other rejection notice) or (c) one (1) Business Day following the day sent by an
internationally recognized overnight courier (with written confirmation of receipt), in each case, at the following addresses or e-mail addresses (or to such other address or
e-mail address as a party may have specified by notice given to the other party pursuant to this provision): 

If to CBAH: 

CBRE Acquisition Holdings, Inc. 

2100 McKinney Avenue, Suite 1250 

Dallas, TX 75201 
  

	 	Attention:	   Cash Smith 

 

	 	Email:	   Cash.Smith@cbre.com 

with a copy (which will not constitute actual or constructive notice) to: 

Simpson Thacher & Bartlett LLP 

425 Lexington Avenue 

New York, NY 10017 
  

	 	Attention:	   Mark Pflug 

 

	 	    	   William Brentani 

 

	 	Email:	   mpflug@stblaw.com 

 

	 	    	   wbrentani@stblaw.com 

If to the Company: 

Altus Power, Inc. 

102 Greenwich Ave 

Greenwich, CT 06830 
  

	 	Attention:	   Gregg Felton 

 

	 	    	   Lars Norell 

 

	 	Email:	   gregg.felton@altuspower.com 

 

	 	    	   lars.norell@altuspower.com 

with a copy (which shall not constitute actual or constructive notice) to: 

Ropes & Gray LLP 

1211 Avenue of the Americas 

New York, NY 10036 
  

	 	Attention:	   Carl P. Marcellino 

  
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	 	Email:	   carl.marcellino@ropesgray.com 

If to a Sponsor Party: 

To such Sponsor Party’s address set forth in Schedule I 

with a copy (which will not constitute actual or constructive notice) to: 

Simpson Thacher & Bartlett LLP 

425 Lexington Avenue 

New York, NY 10017 
  

	 	Attention:	   Mark Pflug 

 

	 	    	   William Brentani 

 

	 	Email:	   mpflug@stblaw.com 

 

	 	    	   wbrentani@stblaw.com 

3.8 Counterparts. This Sponsor Agreement may be executed in two or more counterparts (any of which may be delivered by
electronic transmission), each of which shall constitute an original, and all of which taken together shall constitute one and the same instrument. 

3.9 Entire Agreement. This Sponsor Agreement, the Business Combination Agreement, the Ancillary Agreements and the
other agreements referenced herein constitute the entire agreement and understanding of the parties hereto in respect of the subject matter hereof and supersede all prior understandings, agreements or representations by or among the parties hereto
to the extent they relate in any way to the subject matter hereof. 
 3.10 Interpretation and Construction. The words
“hereof,” “herein” and “hereunder” and words of like import used in this Sponsor Agreement shall refer to this Sponsor Agreement as a whole and not to any particular provision of this Sponsor Agreement. The descriptive
headings used herein are inserted for convenience of reference only and are not intended to be part of or to affect the meaning or interpretation of this Sponsor Agreement. References to Sections are to Sections of this Sponsor Agreement unless
otherwise specified. Any singular term in this Sponsor Agreement shall be deemed to include the plural, and any plural term the singular. The definitions contained in this Sponsor Agreement are applicable to the masculine as well as to the feminine
and neuter genders of such term. Whenever the words “include,” “includes” or “including” are used in this Sponsor Agreement, they shall be deemed to be followed by the words “without limitation,” whether or
not they are in fact followed by those words or words of like import. “Writing,” “written” and comparable terms refer to printing, typing and other means of reproducing words (including electronic media) in a visible form.
References to any statute shall be deemed to refer to such statute and to any rules or regulations promulgated thereunder. References to any Person include the successors and permitted assigns of such Person. References from or through any date
mean, unless otherwise specified, from and including such date or through and including such date, respectively. In the event an ambiguity or question of intent or interpretation arises, this Sponsor Agreement will be construed as if drafted jointly
by the parties, and no presumption or burden of proof will arise favoring or disfavoring any party by virtue of the authorship of any of the provisions of this Sponsor Agreement. 

[Remainder of page intentionally left blank] 

  
 -10- 

 IN WITNESS WHEREOF, the Sponsor Parties, CBAH, and the Company have each
caused this Sponsor Agreement to be duly executed as of the date first written above. 
  

			
	SPONSOR PARTIES:
	
	 CBRE ACQUISITION SPONSOR, LLC

 

 
			
	 By:
	 	 /s/ Emma E.
Giamartino

 
			
	 Name:
	 	 Emma E. Giamartino

	 Title:
	 	Executive Vice President, Corporate Development
	
	 /s/ William F. Concannon

	 Name: William F. Concannon

	
	 /s/ Cash J. Smith

	 Name: Cash J. Smith

 [Signature Page to Sponsor Support Agreement] 

 
			
	CBAH:
	
	 CBRE ACQUISITION HOLDINGS, INC.

		
	 By:
	 	 /s/ Cash J. Smith

		 	Name: Cash J. Smith
		 	Title: President, Chief Financial Officer and Secretary

 [Signature Page to Sponsor Support Agreement] 

 
			
	COMPANY:
	
	 ALTUS POWER, INC.

		
	 By:
	 	 /s/ Gregg Felton

		 	 Name: Gregg Felton

		 	Title: Co-Founder and Co-Chief Executive Officer

 [Signature Page to Sponsor Support Agreement] 

 Schedule I 

Sponsor Party CBAH Common Stock and CBAH Warrants 
  

													
	 Sponsor Party
	  	CBAH Class A Common
Stock	 	  	CBAH Class B
Common Stock	 	  	CBAH Warrants	 
	 CBRE Acquisition Sponsor, LLC

c/o CBRE Acquisition Holdings, Inc.

2100 McKinney Avenue, 12th Floor

Dallas, TX 75201
	  	 	None	 	  	 	1,811,250	 	  	 	7,237,749	 
	 William F. Concannon

c/o CBRE Acquisition Holdings, Inc.

2100 McKinney Avenue, 12th Floor

Dallas, TX 75201
	  	 	None	 	  	 	20,125	 	  	 	18,417	 
	 Cash J. Smith

c/o CBRE Acquisition Holdings, Inc.

2100 McKinney Avenue, 12th Floor

Dallas, TX 75201
	  	 	None	 	  	 	100,625	 	  	 	36,833	 
		  	  
	  
	 	  	  
	  
	 	  	  
	  
	 
	 Total
	  	 	None	 	  	 	1,932,000	 	  	 	7,292,999	 
		  	  
	  
	 	  	  
	  
	 	  	  
	  
	 

 [Schedule I to Sponsor Support Agreement] 

 Schedule II 

Affiliate Agreements 

None, other than as set forth in Schedule 5.17 of the CBAH Schedules. 

[Schedule II to Sponsor Support Agreement]EX-10.2

 Exhibit 10.2 

SUPPORT AGREEMENT 

This Support Agreement (this “Agreement”), dated as of July 12, 2021, is entered into by and among CBRE
Acquisition Holdings, Inc., a Delaware corporation (“CBAH”), CBAH Merger Sub I, Inc., a Delaware corporation and wholly-owned subsidiary of CBAH (“First Merger Sub”), CBAH Merger Sub II, LLC, a Delaware limited
liability company and wholly-owned subsidiary of CBAH (“Second Merger Sub”) and each direct or indirect stockholder of the Company (as defined below) set forth on the signature pages hereto (each, a “Stockholder”).

 RECITALS 

WHEREAS, concurrently herewith, Altus Power, Inc., a Delaware corporation (the “Company”), Altus Power
America Holdings, LLC, a Delaware limited liability company (“Holdings”), APAM Holdings, LLC, a Delaware limited liability company (“APAM”), CBAH, First Merger Sub and Second Merger Sub are entering into a Business
Combination Agreement (as amended, restated, amended and restated, supplemented or otherwise modified from time to time, the “Business Combination Agreement”; capitalized terms used but not defined in this Agreement shall have the
meanings ascribed to them in the Business Combination Agreement), pursuant to which (and subject to the terms and conditions set forth therein), among other things, (i) prior to the Closing, the Company and its Affiliates will effect, or cause
to be effected, the Reorganization, (ii) First Merger Sub will merge with and into the Company, with the Company surviving such merger as a wholly-owned subsidiary of CBAH and (iii) the Company will merge with and into Second Merger Sub,
with Second Merger Sub surviving such merger as a wholly-owned subsidiary of CBAH (the mergers in (ii) and (iii), collectively, the “Mergers”); 

WHEREAS, as of the date hereof, each Stockholder is a record and “beneficial owner” (within the meaning of Rule 13d-3 under the Securities Exchange Act of 1934, as amended (together with the rules and regulations promulgated thereunder, the “Exchange Act”)) of and is entitled to dispose of the equity
interests set forth on such Stockholder’s signature page to this Agreement (collectively, the “Owned Shares”; the Owned Shares and any additional shares of Company Capital Stock (or any securities convertible into or
exercisable or exchangeable for Company Capital Stock) in which such Stockholder acquires record or beneficial ownership after the date hereof, including by purchase, as a result of the Reorganization, a stock dividend, stock split,
recapitalization, combination, reclassification, exchange or change of such shares, or upon exercise or conversion of any securities, the “Covered Shares”); 

WHEREAS, as a condition and inducement to the willingness of the CBAH, First Merger Sub and Second Merger Sub to enter into
the Business Combination Agreement, each Stockholder is entering into this Agreement. 
 AGREEMENT 

NOW, THEREFORE, in consideration of the foregoing and the mutual covenants and agreements herein contained, and
intending to be legally bound hereby, CBAH, First Merger Sub, Second Merger Sub and each Stockholder hereby agree as follows: 

1. Agreement to Vote. Subject to the terms and conditions hereof, prior to the Termination Date (as defined below), each
Stockholder, solely in his, her or its capacity as a direct or indirect stockholder of the Company, irrevocably and unconditionally agrees, and agrees to cause any other holder of record of any of such Stockholder’s Covered Shares, to validly
execute and deliver to the Company in respect of all of such Stockholder’s Covered Shares, on (or effective as of) the fifth (5th) Business Day following the date that the Registration Statement becomes effective, the written consent that will
be solicited by the Company from such Stockholder pursuant to the Business Combination Agreement to obtain the Company Requisite Approval. In addition, prior to the Termination Date, each Stockholder, in his, her or its capacity

 
as a direct or indirect stockholder of the Company, irrevocably and unconditionally agrees (subject to the last paragraph of this Section 1 with respect to the Preferred Stockholder (as
defined below)) that, at any other meeting of the stockholders of the Company (whether annual or special and whether or not an adjourned or postponed meeting, however called and including any adjournment or postponement thereof) and in connection
with any written consent of stockholders of the Company, such Stockholder shall, and shall cause any other holder of record of any of such Stockholder’s Covered Shares to: 

(a) when such meeting is held, appear at such meeting or otherwise cause such Stockholder’s Covered Shares to be counted
as present thereat for the purpose of establishing a quorum; 
 (b) vote (or execute and return an action by written
consent), or cause to be voted at such meeting (or validly execute and return and cause such consent to be granted with respect to), all of such Stockholder’s Covered Shares owned as of the record date for such meeting (or the date that any
written consent is executed by such Stockholder or such other holder of record of such Covered Shares) in favor of the Mergers and the adoption of the Business Combination Agreement and any other matters necessary or reasonably requested by the
Company for consummation of the Mergers and the other transactions contemplated by the Business Combination Agreement; and 

(c) vote (or execute and return an action by written consent), or cause to be voted at such meeting, or validly execute and
return and cause such consent to be granted with respect to, all of such Stockholder’s Covered Shares against any Acquisition Proposal or any proposal relating to a Acquisition Proposal and any other action that would reasonably be expected to
impede, interfere with, delay, postpone or adversely affect the Mergers or any of the other transactions contemplated by the Business Combination Agreement or result in a breach of any covenant, representation or warranty or other obligation or
agreement of the Company under the Business Combination Agreement or result in a breach of any covenant, representation or warranty or other obligation or agreement of such Stockholder contained in this Agreement. 

The obligations of each Stockholder specified in this Section 1 shall apply whether or not the Mergers or any action
described above is recommended by the Company Board or the Company Board has previously recommended the Mergers but withdrew or otherwise changed such recommendation. Furthermore, the Stockholders, in their capacity as direct or indirect
equityholders of Altus Power America Holdings, LLC and APAM Holdings, LLC, shall consent to the completion of the Reorganization and use commercially reasonable efforts to assist in facilitation of the same. 

Notwithstanding the foregoing or anything to the contrary herein, nothing in this Agreement shall obligate GSO Altus Holdings LP (the
“Preferred Stockholder”), in its capacity as a holder of Company Preferred Stock or as the Holder Representative (as defined in the Series A Redeemable Preferred Stock Certificate of Designations of the Company), to vote in favor
of, consent to or otherwise approve the Mergers, any other Transaction or the adoption of the Business Combination Agreement to the extent that, at the Closing, all of the outstanding Company Preferred Stock will not be redeemed in cash in full for
an amount equal to the Company Preferred Stock Redemption Price for such Company Preferred Stock as of the Closing Date pursuant to and in accordance with Section 2.02 of the Business Combination Agreement, and any such vote, consent or
approval provided by the Preferred Stockholder following the date hereof in favor of the Mergers and the adoption of the Business Combination Agreement may be conditioned upon all Company Preferred Stock being redeemed at the Closing in cash in full
for an amount equal to the Company Preferred Stock Redemption Price for such Company Preferred Stock as of the Closing Date. 

2. No Inconsistent Agreements. Each Stockholder hereby covenants and agrees that such Stockholder shall not (and shall
cause any other holder of record of such Stockholder’s Covered Shares not to), at any time prior to the Termination Date, (a) enter into any voting agreement or voting trust with respect to any of such Stockholder’s Covered Shares
that is inconsistent with such Stockholder’s obligations 

 
pursuant to this Agreement, (b) grant a proxy or power of attorney with respect to any of such Stockholder’s Covered Shares that is inconsistent with such Stockholder’s obligations
pursuant to this Agreement, or (c) enter into any agreement or undertaking that is otherwise inconsistent with, or would interfere with, or prohibit or prevent it from satisfying, its obligations pursuant to this Agreement. 

3. Termination. This Agreement shall terminate upon the earliest of (a) the Second Effective Time, (b) the
termination of the Business Combination Agreement in accordance with its terms, and (c) the time this Agreement is terminated upon the mutual written agreement of CBAH, First Merger Sub, Second Merger Sub and each Stockholder (the earliest such
date under clauses (a), (b) and (c) being referred to herein as the “Termination Date”); provided, that the provisions set forth in Sections 10 through 21 shall survive the termination of
this Agreement; provided, further, that the termination of this Agreement shall not relieve any party hereto from liability arising in respect of such party’s Willful Breach of this Agreement prior to such termination. 

4. Representations and Warranties of Each Stockholder. Each Stockholder hereby represents and warrants to CBAH as to
itself as follows: 
 (a) Such Stockholder is the only record and beneficial owner (within the meaning of Rule 13d-3 under the Exchange Act) of, and has good, valid and marketable title to, the Covered Shares, free and clear of Liens other than as created by this Agreement or the organizational documents of the Company
(including, for the purposes hereof, any agreements between or among stockholders of the Company). As of the date hereof, other than the Covered Shares, such Stockholder does not own beneficially or of record any shares of capital stock of the
Company (or any securities convertible into shares of capital stock of the Company) or any interest therein. 
 (b) Such
Stockholder (i) except as provided in this Agreement, has full voting power, full power of disposition and full power to issue instructions with respect to the matters set forth herein, in each case, with respect to such Stockholder’s
Covered Shares, (ii) has not entered into any voting agreement or voting trust with respect to any of such Stockholder’s Covered Shares that is inconsistent with such Stockholder’s obligations pursuant to this Agreement,
(iii) has not granted a proxy or power of attorney with respect to any of such Stockholder’s Covered Shares that is inconsistent with such Stockholder’s obligations pursuant to this Agreement and (iv) has not entered into any
agreement or undertaking that is otherwise inconsistent with, or would interfere with, or prohibit or prevent it from performing and satisfying, its obligations pursuant to this Agreement. 

(c) Such Stockholder affirms that (i) if such Stockholder is a natural person, he or she has all the requisite power and
authority and has taken all action necessary in order to execute and deliver this Agreement, to perform his or her obligations hereunder and to consummate the transactions contemplated hereby, and (ii) if such Stockholder is not a natural
person, (A) it is a legal entity duly organized, validly existing and, to the extent such concept is applicable, in good standing under the Laws of the jurisdiction of its organization and (B) has all requisite corporate or other power and
authority and has taken all corporate or other action necessary in order to execute, deliver and perform its obligations under this Agreement and to consummate the transactions contemplated hereby. This Agreement has been duly executed and delivered
by such Stockholder and constitutes a valid and binding agreement of such Stockholder enforceable against such Stockholder in accordance with its terms, subject to applicable bankruptcy, insolvency, fraudulent conveyance, reorganization, moratorium
and similar Laws affecting creditors’ rights generally and subject, as to enforceability, to general principles of equity. 

(d) Other than the filings, notices and reports pursuant to, in compliance with or required to be made under the Exchange Act,
no filings, notices, reports, consents, registrations, approvals, permits, waivers, expirations of waiting periods or authorizations are required to be obtained by such 

 
Stockholder from, or to be given by such Stockholder to, or be made by such Stockholder with, any Governmental Authority in connection with the execution, delivery and performance by such
Stockholder of this Agreement, the consummation of the transactions contemplated hereby or the Mergers and the other transactions contemplated by the Business Combination Agreement. 

(e) The execution, delivery and performance of this Agreement by such Stockholder do not, and the consummation of the
transactions contemplated hereby or the Mergers and the other transactions contemplated by the Business Combination Agreement will not, constitute or result in (i) a breach or violation of, or a default under, the limited partnership agreement
or similar governing documents of such Stockholder (if such Stockholder is not a natural person), (ii) with or without notice, lapse of time or both, a breach or violation of, a termination (or right of termination) of or a default under, the
loss of any benefit under, the creation, modification or acceleration of any obligations under or the creation of a Lien on any of the properties, rights or assets of such Stockholder pursuant to any Contract binding upon such Stockholder or,
assuming (solely with respect to performance of this Agreement and the transactions contemplated hereby), compliance with the matters referred to in Section 4(d), under any applicable Law to which such Stockholder is
subject or (iii) any change in the rights or obligations of any party under any Contract legally binding upon such Stockholder, except, in the case of clause (ii) or (iii) directly above, for any such breach, violation, termination,
default, creation, acceleration or change that would not, individually or in the aggregate, reasonably be expected to prevent or materially delay or impair such Stockholder’s ability to perform its obligations hereunder or to consummate the
transactions contemplated hereby, the consummation of the Mergers or the other transactions contemplated by the Business Combination Agreement. 

(f) As of the date of this Agreement, there is no action, proceeding or investigation pending against such Stockholder or, to
the knowledge of such Stockholder, threatened against such Stockholder that questions the beneficial or record ownership of such Stockholder’s Owned Shares, the validity of this Agreement or the performance by such Stockholder of its
obligations under this Agreement. 
 (g) Such Stockholder understands and acknowledges that CBAH is entering into the
Business Combination Agreement in reliance upon such Stockholder’s execution and delivery of this Agreement and the representations, warranties, covenants and other agreements of such Stockholder contained herein. 

(h) No investment banker, broker, finder or other intermediary is entitled to any broker’s, finder’s, financial
advisor’s or other similar fee or commission for which CBAH or the Company or any of their respective Subsidiaries is or will be liable in connection with the transactions contemplated hereby based upon arrangements made by such Stockholder in
his, her or its capacity as a stockholder or, to the knowledge of such Stockholder, on behalf of such Stockholder in his, her or its capacity as a stockholder. 

5. Certain Covenants of Each Stockholder. Except in accordance with the terms of this Agreement, each Stockholder hereby
covenants and agrees as follows: 
 (a) No Solicitation. Subject to Section 6 hereof, prior
to the Termination Date, each Stockholder agrees not to, directly or indirectly, (i) initiate, solicit or knowingly encourage or knowingly facilitate any inquiries or requests for information with respect to, or the making of, any inquiry
regarding, or any proposal or offer that constitutes, or could reasonably be expected to result in or lead to, any Acquisition Proposal, (ii) engage in, continue or otherwise participate in any negotiations or discussions concerning, or provide
access to its properties, books and records or any confidential information or data to, any Person relating to any proposal, offer, inquiry or request for information that constitutes, or could reasonably be expected to result in or lead to, any
Acquisition Proposal, (iii) approve, endorse or recommend, or propose publicly to approve, endorse or recommend, any Acquisition Proposal, (iv) execute 

 
or enter into, any letter of intent, memorandum of understanding, agreement in principle, confidentiality agreement, merger agreement, acquisition agreement, exchange agreement, joint venture
agreement, partnership agreement, option agreement or other similar agreement for or relating to any Acquisition Proposal or (v) resolve or agree to do any of the foregoing. Each Stockholder also agrees that, immediately following the execution
of this Agreement, such Stockholder shall, and shall use commercially reasonable efforts to cause its Representatives to, cease any solicitations, discussions or negotiations with any Person (other than the Parties and their respective
Representatives) conducted heretofore in connection with an Acquisition Proposal or any inquiry or request for information that could reasonably be expected to lead to, or result in, an Acquisition Proposal. Each Stockholder shall promptly (and in
any event within one Business Day) notify, in writing, the Company of the receipt of any inquiry, proposal, offer or request for information received after the date hereof that constitutes, or could reasonably be expected to result in or lead to,
any Acquisition Proposal. 
 Each Stockholder shall promptly (and in any event within one Business Day) keep the Company reasonably informed
of any material developments with respect to any such inquiry, proposal, offer, request for information or Acquisition Proposal (including any material changes thereto). 

Notwithstanding anything in this Agreement to the contrary, (i) no Stockholder shall be responsible for the actions of the Company or the
Company Board (or any committee thereof), any Subsidiary of the Company, or any officers, directors or employees of any of the foregoing (in their respective capacities as such) or any professional advisors of any of the foregoing (collectively, the
“Company Related Parties”), including with respect to any of the matters contemplated by this Section 5(a), (ii) no Stockholder makes any representations or warranties with respect to the actions of
any of the Company Related Parties, and (iii) any breach by the Company of its obligations under Section 6.06 of the Business Combination Agreement shall not be considered a breach of this Section 5(a) (it being
understood for the avoidance of doubt that each Stockholder shall remain responsible for any breach by such Stockholder or his, her or its Representatives (other than any such Representative that is a Company Related Party) of this
Section 5(a)). 
 (b) Each Stockholder hereby agrees not to, directly or indirectly, other than in
connection with the Reorganization, (i) sell, transfer, pledge, encumber, assign, hedge, swap, convert or otherwise dispose of (including by merger (including by conversion into securities or other consideration), by tendering into any tender
or exchange offer, by testamentary disposition, by operation of Law or otherwise), either voluntarily or involuntarily (collectively, “Transfer”), or enter into any Contract or option with respect to the Transfer of, any of such
Stockholder’s Covered Shares, or (ii) take any action that would make any representation or warranty of such Stockholder contained herein untrue or incorrect or have the effect of preventing or disabling such Stockholder from performing
its obligations under this Agreement; provided, however, that nothing herein shall prohibit a Transfer to an Affiliate of such Stockholder (a “Permitted Transfer”); provided, further, that any Permitted
Transfer shall be permitted only if, as a precondition to such Transfer, the transferee agrees in a writing, reasonably satisfactory in form and substance to CBAH, to assume all of the obligations of such Stockholder under, and be bound by all of
the terms of, this Agreement; provided, further, that any Transfer permitted under this Section 5(b) shall not relieve such Stockholder of its obligations under this Agreement. Any Transfer in violation of
this Section 5(b) with respect to such Stockholder’s Covered Shares shall be null and void. 

(c) Each Stockholder hereby authorizes the Company to maintain a copy of this Agreement at either the executive office or the
registered office of the Company. 
 6. Further Assurances. From time to time, at CBAH’s request and without
further consideration, each Stockholder shall execute and deliver such additional documents and take all such further action as may be reasonably necessary or reasonably requested to effect the actions and consummate the transactions contemplated by
this Agreement (including the Reorganization and the Mergers). Each 

 
Stockholder further agrees not to commence or participate in, and to take all actions necessary to opt out of any class in any class action with respect to, any action or claim, derivative or
otherwise, against CBAH, CBAH’s Affiliates, the Sponsor, the Company, the Company’s Affiliates or any of their respective successors and assigns (a) challenging the validity of, or seeking to enjoin the operation of, any provision of
this Agreement or the Business Combination Agreement (including the allocation of the consideration payable as part of the Mergers and the Reorganization pursuant to the terms of the Business Combination Agreement) or (b) alleging a breach of
any fiduciary duty of any Person in connection with the evaluation, negotiation or entry into the Business Combination Agreement relating to the negotiation, execution or delivery of this Agreement or the Business Combination Agreement or the
consummation of the transactions contemplated by this Agreement or the Business Combination Agreement. 
 7.
Disclosure. Each Stockholder hereby authorizes the Company and CBAH to publish and disclose in any announcement or disclosure required by the SEC such Stockholder’s identity and ownership of the Covered Shares and the nature of such
Stockholder’s obligations under this Agreement; provided, that prior to any such publication or disclosure the Company and CBAH have provided such Stockholder with an opportunity to review and comment upon such announcement or
disclosure, which comments the Company and CBAH will consider in good faith; provided, further, that the foregoing proviso shall not apply to any such publication or disclosure the content of which concerning the foregoing does not substantially
differ from any prior such publication or disclosure. 
 8. Changes in Capital Stock. In the event of a stock split,
stock dividend or distribution, or any change in the Company’s capital stock by reason of any split-up, reverse stock split, recapitalization, combination, reclassification, exchange of shares or the like
(including the Reorganization), the terms “Owned Shares” and “Covered Shares” shall be deemed to refer to and include such shares as well as all such stock dividends and distributions and any securities into which or for which
any or all of such shares may be changed or exchanged or which are received in such transaction. 
 9. Amendment and
Modification. This Agreement may not be amended, modified or supplemented in any manner, whether by course of conduct or otherwise, except by an instrument in writing signed by CBAH, First Merger Sub, Second Merger Sub and each Stockholder. 

10. Waiver. No failure or delay by any party hereto exercising any right, power or privilege hereunder shall operate as
a waiver thereof nor shall any single or partial exercise thereof preclude any other or further exercise thereof or the exercise of any other right, power or privilege. The rights and remedies of the parties hereto hereunder are cumulative and are
not exclusive of any rights or remedies which they would otherwise have hereunder. Any agreement on the part of a party hereto to any such waiver shall be valid only if set forth in a written instrument executed and delivered by such party. 

11. Notices. All notices and other communications hereunder shall be in writing and shall be deemed given if delivered
personally, by email (with confirmation of receipt) or sent by a nationally recognized overnight courier service, such as Federal Express, to the parties hereto at the following addresses (or at such other address for a party as shall be specified
by like notice made pursuant to this Section 11): 
 if to a Stockholder, to it at: 

the address (including email) set forth in the Company’s books and records, or to such other address or to the attention
of such other person as such Stockholder has specified by prior written notice to the sending party 
 with a copy (which
shall not constitute notice) to: 

 Ropes & Gray LLP 

1211 Avenue of the Americas 

New York, NY 10036 

Attention: Carl P. Marcellino 

Facsimile: (646) 728-1523 

Email:       carl.marcellino@ropesgray.com 

if to CBAH, First Merger Sub or Second Merger Sub, to it at: 

CBRE Acquisition Holdings, Inc. 

2100 McKinney Avenue, Suite 1250 

Dallas, TX 75201 

Attention: Cash Smith 

Email:      Cash.Smith@cbre.com 

with a copy (which shall not constitute notice) to: 

Simpson Thacher & Bartlett LLP 

425 Lexington Avenue 

New York, NY 10017 

Attention: Mark Pflug 

     William Brentani 

Email:       mpflug@stblaw.com 

   wbrentani@stblaw.com 

12. No Ownership Interest. Nothing contained in this Agreement shall be deemed to vest in CBAH any direct or indirect
ownership or incidence of ownership of or with respect to the Covered Shares of any Stockholder. All rights, ownership and economic benefits of and relating to the Covered Shares of each Stockholder shall remain vested in and belong to such
Stockholder, and CBAH shall have no authority to direct such Stockholder in the voting or disposition of any of such Stockholder’s Covered Shares, except as otherwise provided herein. 

13. Entire Agreement. This Agreement and the Business Combination Agreement constitute the entire agreement and
supersede all prior agreements and understandings, both written and oral, between the parties hereto with respect to the subject matter hereof and thereof. 

14. No Third-Party Beneficiaries. Each Stockholder hereby agrees that its representations, warranties and covenants set
forth herein are solely for the benefit of the CBAH in accordance with and subject to the terms of this Agreement, and this Agreement is not intended to, and does not, confer upon any Person other than the parties hereto any rights or remedies
hereunder, including the right to rely upon the representations and warranties set forth herein, and the parties hereto hereby further agree that this Agreement may only be enforced against, and any Action that may be based upon, arise out of or
relate to this Agreement, or the negotiation, execution or performance of this Agreement may only be made against, the Persons expressly named as parties hereto; provided, that the Company shall be an express third party beneficiary with
respect to Section 4 and Section 5(b) hereof. 
 15. Governing Law and
Venue; Service of Process; Waiver of Jury Trial. 
 (a) This Agreement shall be governed by, and construed in accordance
with, the Laws of the State of Delaware, without giving effect to conflicts of laws principles or rules to the extent such principles or rules are not mandatorily applicable and would require or permit the application of the Law of any jurisdiction
other than the State of Delaware. 

 (b) In addition, each of the parties (i) consents to submit itself, and
hereby submits itself, to the personal jurisdiction of the Court of Chancery of the State of Delaware or, if such court does not have subject matter jurisdiction, any state or federal court located in the State of Delaware having subject matter
jurisdiction, in the event any dispute arises out of this Agreement or any of the transactions contemplated by this Agreement, (ii) agrees that it will not attempt to deny or defeat such personal jurisdiction by motion or other request for
leave from any such court, and agrees not to plead or claim any objection to the laying of venue in any such court or that any judicial proceeding in any such court has been brought in an inconvenient forum, (iii) agrees that it will not bring
any action relating to this Agreement or any of the transactions contemplated by this Agreement in any court other than the Court of Chancery of the State of Delaware or, if such court does not have subject matter jurisdiction, any state or federal
court located in the State of Delaware having subject matter jurisdiction, and (iv) consents to service of process being made through the notice procedures set forth in Section 11. 

(c) EACH OF THE PARTIES HEREBY KNOWINGLY, INTENTIONALLY AND VOLUNTARILY IRREVOCABLY WAIVES ANY AND ALL RIGHTS TO TRIAL BY JURY
IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATED TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY. 
 16.
Assignment; Successors. Neither this Agreement nor any of the rights, interests or obligations hereunder shall be assigned by any of the parties hereto in whole or in part (whether by operation of Law or otherwise) without the prior written
consent of each other party, and any such assignment without such consent shall be null and void. This Agreement shall be binding upon, inure to the benefit of and be enforceable by the parties hereto and their respective successors and permitted
assigns. 
 17. Enforcement. The rights and remedies of the parties shall be cumulative with and not exclusive of any
other remedy conferred hereby. The parties agree that irreparable damage would occur and that the parties would not have any adequate remedy at law in the event that any of the provisions of this Agreement were not performed in accordance with their
specific terms or were otherwise breached. It is accordingly agreed that the parties shall be entitled to an injunction or injunctions to prevent breaches or threatened breaches of this Agreement and to enforce specifically the terms and provisions
of this Agreement, including each Stockholder’s obligations to vote its Covered Shares as provided in this Agreement, in the Court of Chancery of the State of Delaware or, if under applicable Law exclusive jurisdiction over such matter is
vested in the federal courts, any state or federal court located in the State of Delaware, without proof of actual damages or otherwise (and each party hereby waives any requirement for the securing or posting of any bond in connection with such
remedy), this being in addition to any other remedy to which they are entitled at law or in equity. 
 18.
Severability. If any term or other provision of this Agreement is held by a court of competent jurisdiction or other authority to be invalid, void, unenforceable or against its regulatory policy, the remainder of the terms and provisions of
this Agreement shall remain in full force and effect and shall in no way be affected, impaired or invalidated, so long as the economic and legal substance of the transactions contemplated hereby, taken as a whole, are not affected in a manner
materially adverse to any party hereto. Upon such a determination, the parties hereto shall negotiate in good faith to modify this Agreement so as to effect the original intent of the parties hereto as closely as possible in an acceptable manner in
order that the transactions contemplated hereby be consummated as originally contemplated to the fullest extent possible. 

19. Counterparts. This Agreement may be executed in two or more counterparts, each of which shall be deemed an original,
but all of which together shall constitute one and the same agreement; it being understood that each party need not sign the same counterpart. This Agreement shall become effective when 

 
each party shall have received a counterpart hereof signed by all of the other parties. Signatures delivered electronically or by facsimile shall be deemed to be original signatures. 

20. Interpretation and Construction. The words “hereof,” “herein” and “hereunder” and
words of like import used in this Agreement shall refer to this Agreement as a whole and not to any particular provision of this Agreement. The descriptive headings used herein are inserted for convenience of reference only and are not intended to
be part of or to affect the meaning or interpretation of this Agreement. References to Sections are to Sections of this Agreement unless otherwise specified. Any singular term in this Agreement shall be deemed to include the plural, and any plural
term the singular. The definitions contained in this Agreement are applicable to the masculine as well as to the feminine and neuter genders of such term. Whenever the words “include,” “includes” or “including” are used
in this Agreement, they shall be deemed to be followed by the words “without limitation,” whether or not they are in fact followed by those words or words of like import. “Writing,” “written” and comparable terms refer
to printing, typing and other means of reproducing words (including electronic media) in a visible form. References to any statute shall be deemed to refer to such statute and to any rules or regulations promulgated thereunder. References to any
person include the successors and permitted assigns of that person. References from or through any date mean, unless otherwise specified, from and including such date or through and including such date, respectively. In the event an ambiguity or
question of intent or interpretation arises, this Agreement will be construed as if drafted jointly by the parties, and no presumption or burden of proof will arise favoring or disfavoring any party by virtue of the authorship of any of the
provisions of this Agreement. 
 21. Capacity as a Stockholder. Notwithstanding anything herein to the contrary, each
Stockholder signs this Agreement solely in such Stockholder’s capacity as a direct or indirect stockholder of the Company, and not in any other capacity and this Agreement shall not limit or otherwise affect the actions of such Stockholder or
any Affiliate, employee or designee of such Stockholder or any of their respective Affiliates in his or her capacity, if applicable, as an officer or director of the Company or any other Person. 

[The remainder of this page is intentionally left blank.] 

 IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed (where applicable, by their respective officers or other authorized Persons thereunto duly authorized) as of the date first written above. 
  

					
	STOCKHOLDER
	
	ALTUS POWER AMERICA HOLDINGS, LLC
		
	 By:
	 	 /s/ Gregg Felton

		 	 Name:
	 	 Gregg Felton

		 	 Title:
	 	 President

	
	 Owned Shares:

		
	 1,029         
	 	Shares of Common Stock of the Company
		
	
0                
	 	Shares of Series A Redeemable Preferred Stock of the Company
		
	
0                
	 	Common Units of Holdings
		
	
0                
	 	Vested Common Units of APAM
		
	
0                
	 	Unvested Common Units of APAM

 [Signature Page to Support Agreement] 

 IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed (where applicable, by their respective officers or other authorized Persons thereunto duly authorized) as of the date first written above. 
  

					
	STOCKHOLDER
	
	 APAM HOLDINGS LLC

 

 
					
	 By:
	 	 /s/ Gregg Felton

		 	 Name:
	 	 Gregg Felton

		 	 Title:
	 	 Manager

 
					
	  
 Owned Shares:

		
	 0                
	 	Shares of Common Stock of the Company
		
	 0                
	 	Shares of Series A Redeemable Preferred Stock of the Company
		
	 57,169,339
	 	Common Units of Holdings
		
	 0                
	 	Vested Common Units of APAM
		
	 0                
	 	Unvested Common Units of APAM

 [Signature Page to Support Agreement] 

 IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed (where applicable, by their respective officers or other authorized Persons thereunto duly authorized) as of the date first written above. 
  

					
	STOCKHOLDER
	
	 START CAPITAL LLC

 

 
					
	 By:
	 	 /s/ Lars Norell

		 	 Name:
	 	 Lars Norell

		 	 Title:
	 	 Managing Member

 
					
	  
 Owned Shares:

		
	 0                
	 	Shares of Common Stock of the Company
		
	 0                
	 	Shares of Series A Redeemable Preferred Stock of the Company
		
	 0                
	 	Common Units of Holdings
		
	 11,465,611
	 	Vested Common Units of APAM
		
	 0                
	 	Unvested Common Units of APAM

 [Signature Page to Support Agreement] 

 IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed (where applicable, by their respective officers or other authorized Persons thereunto duly authorized) as of the date first written above. 
  

					
	STOCKHOLDER
	
	 FELTON ASSET MANAGEMENT LLC

 

 
					
	 By:
	 	 /s/ Gregg Felton

		 	 Name:
	 	 Gregg Felton

		 	 Title:
	 	 Managing Member

 
					
	  
 Owned Shares:

		
	 0                
	 	Shares of Common Stock of the Company
		
	 0                
	 	Shares of Series A Redeemable Preferred Stock of the Company
		
	 0                
	 	Common Units of Holdings
		
	 6,889,766
	 	Vested Common Units of APAM
		
	 0                
	 	Unvested Common Units of APAM

 [Signature Page to Support Agreement] 

 IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed (where applicable, by their respective officers or other authorized Persons thereunto duly authorized) as of the date first written above. 
  

					
	STOCKHOLDER
	
	 /s/ Tony Savino

	 Name:
	 	 Anthony Savino

	
	 Owned Shares:

		
	 0                
	 	 Shares of Common Stock of the Company

		
	 0                
	 	 Shares of Series A Redeemable Preferred Stock of the Company

		
	 0                
	 	 Common Units of Holdings

		
	 1,890,062
	 	 Vested Common Units of APAM

		
	 50,000    
	 	 Unvested Common Units of APAM

 [Signature Page to Support Agreement] 

 IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed (where applicable, by their respective officers or other authorized Persons thereunto duly authorized) as of the date first written above. 
  

					
	STOCKHOLDER
	
	 GSO ALTUS HOLDINGS LP

 

 
					
	 By:
	 	GSO Altus Holdings Associates LLC, its general partner
		
	 By:
	 	 /s/ Marisa Beeney

		 	 Name:
	 	 Marisa Beeney

		 	 Title:
	 	 Authorized Signatory

 
					
	  
 Owned Shares:

		
	 0                
	 	Shares of Common Stock of the Company
		
	 208,000    
	 	Shares of Series A Redeemable Preferred Stock of the Company
		
	 24,501,145
	 	Common Units of Holdings
		
	 0                
	 	Vested Common Units of APAM
		
	 0                
	 	Unvested Common Units of APAM

 [Signature Page to Support Agreement] 

 IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed (where applicable, by their respective officers or other authorized Persons thereunto duly authorized) as of the date first written above. 
  

					
	 CBRE ACQUISITION HOLDINGS, INC.

		
	 By:
	 	 /s/ Cash J. Smith

		 	 Name:
	 	 Cash J. Smith

		 	 Title:
	 	President, Chief Financial Officer and Secretary
	
	 CBAH MERGER SUB I, INC.

		
	 By:
	 	 /s/ Cash J. Smith

		 	 Name:
	 	 Cash J. Smith

		 	 Title:
	 	 President and Secretary

	
	 CBAH MERGER SUB II, LLC

		
	 By:
	 	 /s/ Cash J. Smith

		 	 Name:
	 	 Cash J. Smith

		 	 Title:
	 	 President and Secretary

 [Signature Page to Support Agreement]

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