Document:

Exhibit 10.2

 

Execution Version

 

SPONSOR SUPPORT AGREEMENT

 

This SPONSOR SUPPORT AGREEMENT (this “Agreement”),
dated as of January 11, 2021, is made by and among ArcLight Clean Transition Corp., a Cayman Islands exempted company (“ACTC”),
and Proterra Inc, a Delaware corporation (the “Company”), ArcLight CTC Holdings, L.P., a Delaware limited partnership
(the “Sponsor”), and the undersigned holders of Class B ordinary shares of ACTC (such shares, “ACTC
Class B Shares” and the holders thereof, including the Sponsor, collectively, the “Class B Holders”).
ACTC, the Company and the Class B Holders shall be referred to herein from time to time collectively as the “Parties”.
Capitalized terms used but not otherwise defined herein shall have the meanings ascribed to such terms in the Merger Agreement
(as defined below).

 

WHEREAS, ACTC, the Company and Phoenix Merger
Sub, Inc., a Delaware corporation entered into that certain Merger Agreement, dated as of the date hereof (as it may be amended,
restated or otherwise modified from time to time in accordance with its terms, the “Merger Agreement”);

 

WHEREAS, the Class B Holders are the record
and beneficial owners of all of the issued and outstanding ACTC Class B Shares; and

 

WHEREAS, the Merger Agreement contemplates
that the Parties will enter into this Agreement concurrently with the execution and delivery of the Merger Agreement by the parties
thereto, pursuant to which, among other things, (a) each Class B Holder will vote in favor of approval of the Proposals and (b)
each Class B Holder will agree to waive any adjustment to the conversion ratio set forth in the organizational documents of ACTC
or any other anti-dilution or similar protection with respect to all of the ACTC Class B Shares related to the transactions contemplated
by the Merger Agreement.

 

NOW, THEREFORE, in consideration of the
premises and the mutual promises contained herein and for other good and valuable consideration, the receipt and sufficiency of
which are hereby acknowledged, the Parties, each intending to be legally bound, hereby agree as follows:

 

1. Agreement to
Vote. Each Class B Holder hereby irrevocably and unconditionally agrees (a) to vote at any meeting of the shareholders of ACTC,
and in any action by written resolution of the shareholders of ACTC, all of such Class B Holder’s ACTC Class B Shares (together
with any other equity securities of ACTC that such Class B Holder holds of record or beneficially, as of the date of this Agreement,
or acquires record or beneficial ownership after the date hereof, collectively, the “Subject ACTC Equity Securities”)
(i) in favor of the Proposals and (ii) against, and withhold consent with respect to, any other matter, action or proposal that
would reasonably be expected to result in (x) a breach of any of the Acquiror’s or Merger Sub’s covenants, agreements
or obligations under the Merger Agreement or (y) any of the conditions to the Closing set forth in Sections 9.01 or 9.03 of the
Merger Agreement not being satisfied, (b) if a meeting is held in respect of the matters set forth in clause (a), to appear at
the meeting, in person or by proxy, or otherwise cause all of such Class B Holder’s Subject ACTC Equity Securities to be
counted as present thereat for purposes of establishing a quorum and (c) not to redeem, elect to redeem or tender or submit any
of its Subject ACTC Equity Securities for redemption in connection with such stockholder approval, the Merger or any other transactions
contemplated by the Merger Agreement. Prior to any valid termination of the Merger Agreement, each Class B Holder shall take, or
cause to be taken, all actions and to do, or cause to be done, all things reasonably necessary under applicable Laws to consummate
the Merger and the other transactions contemplated by the Merger Agreement and on the terms and subject to the conditions set forth
therein. The obligations of each Class B Holder specified in this Section 1 shall apply whether or not the Merger, any of the transactions
contemplated by the Merger Agreement or any action described above is recommend by Acquiror’s board of directors.

 

     

     

    

 

2. Waiver of Anti-dilution
Protection. Each Class B Holder hereby irrevocably (a) waives, subject to, and conditioned upon, the occurrence of the Closing,
to the fullest extent permitted by law and the Amended and Restated Memorandum and Articles of Association of ACTC, and (b) agrees
not to assert or perfect, any rights to adjustment or other anti-dilution protections with respect to the rate that the ACTC Class
B Shares convert into ACTC Class A Shares in connection with the transactions contemplated by the Merger Agreement.

 

3. Transfer of Shares.

 

a. Each Class B Holder
hereby agrees that it shall not (i) sell, assign, transfer (including by operation of law), place a lien on, pledge, hypothecate,
grant an option to purchase, distribute, dispose of or otherwise encumber any of its Subject ACTC Equity Securities or otherwise
enter into any contract, option or other arrangement or undertaking to do any of the foregoing (each, a “Transfer”),
(ii) deposit any of its Subject ACTC Equity Securities into a voting trust or enter into a voting agreement or arrangement or grant
any proxy or power of attorney with respect to any of its Subject ACTC Equity Securities that conflicts with any of the covenants
or agreements set forth in this Agreement or (iii) (iv) take any action that would have the effect of preventing or materially
delaying the performance of its obligations hereunder; provided, however, that the foregoing shall not apply to any
Transfer (A) to ACTC’s officers or directors or affiliates; (B) by private sales or transfers made in connection with
the transactions contemplated by the Merger Agreement; and (C) by virtue of the Sponsor’s organizational documents upon liquidation
or dissolution of the Sponsor; provided, that any transferee of any Transfer of the types set forth in clauses (A) through
(C) must enter into a written agreement agreeing to be bound by this Agreement.

 

b. In furtherance of
the foregoing, ACTC hereby agrees to (i) place a revocable stop order on all Subject ACTC Equity Securities subject to Section
3(a), including those which may be covered by a registration statement, and (ii) notify ACTC’s transfer agent in writing
of such stop order and the restrictions on such Subject ACTC Equity Securities under Section 3(a) and direct ACTC’s
transfer agent not to process any attempts by any Class B Holder to Transfer any Subject ACTC Equity Securities except in compliance
with Section 3(a); for the avoidance of doubt, the obligations of ACTC under this Section 3(b) shall be deemed to
be satisfied by the existence of any similar stop order and restrictions currently existing on the Subject ACTC Equity Securities.

 

4. Other Covenants.

 

a. Each Class B Holder
hereby agrees to be bound by and subject to (i) Section 8.04 (Confidentiality; Publicity) of the Merger Agreement to the same extent
as such provisions apply to the parties to the Merger Agreement, as if such Class B Holder is directly a party thereto, and (ii)
Section 7.12 (Exclusivity) and Section 8.01(c) (Support of Transaction) of the Merger Agreement to the same extent as such provisions
apply to ACTC, as if such Class B Holder is directly party thereto.

 

b. To the fullest extent
permitted by applicable law, ACTC, which will file a name change and appoint directors pursuant to the Merger Agreement in connection
with the Closing (as of the Closing, the “Corporation”), on behalf of itself and its subsidiaries, renounces
any interest or expectancy of the Corporation and its subsidiaries in, or in being offered an opportunity to participate in, any
business opportunities that are from time to time presented to ArcLight Capital Partners (“ArcLight”) or any
of its affiliates or any of its or their agents, shareholders, members, partners, directors, officers, employees, affiliates or
subsidiaries (other than the Corporation and its subsidiaries), including any director or officer of the Corporation who is also
an agent, shareholder, member, partner, director, officer, employee, affiliate or subsidiary of ArcLight (each, a “Business
Opportunities Exempt Party”), even if the business opportunity is one that the Corporation or its subsidiaries might
reasonably be deemed to have pursued or had the ability or desire to pursue if granted the opportunity to do so, and no Business
Opportunities Exempt Party shall have any duty to communicate or offer any such business opportunity to the Corporation or be liable
to the Corporation or any of its subsidiaries or any stockholder, including for breach of any fiduciary or other duty, as a director
or officer or controlling stockholder or otherwise, and the Corporation shall indemnify each Business Opportunities Exempt Party
against any claim that such person is liable to the Corporation or its stockholders for breach of any fiduciary duty, by reason
of the fact that such person (i) participates in, pursues or acquires any such business opportunity, (ii) directs any such business
opportunity to another person or (iii) fails to present any such business opportunity, or information regarding any such business
opportunity, to the Corporation or its subsidiaries, unless, in the case of a person who is a director or officer of the Corporation,
such business opportunity is expressly offered to such director or officer in writing solely in his capacity as a director or officer
of the Corporation.

 

    2

     

    

 

c. Each Class B Holder
acknowledges and agrees that the Company is entering into the Merger Agreement in reliance upon such Class B Holder entering into
this Agreement and agreeing to be bound by, and perform, or otherwise comply with, as applicable, the agreements, covenants and
obligations contained in this Agreement and but for such Class B Holder entering into this Agreement and agreeing to be bound by,
and perform, or otherwise comply with, as applicable, the agreements, covenants and obligations contained in this Agreement the
Company would not have entered into, or agreed to consummate the transactions contemplated by, the Merger Agreement.

 

5. Termination of
ACTC Class B Shares Lock-up Period. Each Class B Holder and ACTC hereby agree that effective as of the consummation of the
Closing (and not before), Section 5 of that certain Letter Agreement, dated September 25, 2020, by and among ACTC, the Class B
Holders and certain other parties thereto (the “Class B Holder Agreement”), shall be amended and restated in
its entirety as follows:

 

“5.
Reserved.”

 

The amendment and restatement
set forth in this Section 5 shall be void and of no force and effect with respect to the Class B Holder Agreement if the
Merger Agreement shall be terminated for any reason in accordance with its terms.

 

6. Representations
and Warranties.

 

a. Sponsor represents
and warrants to the Company as follows: (i) it is duly organized, validly existing and in good standing under the laws of Delaware,
and the execution, delivery and performance of this Agreement and the consummation of the transactions contemplated hereby are
within Sponsor’s, corporate, limited liability company or organizational powers and have been duly authorized by all necessary
actions on the part of Sponsor; (ii) the execution and delivery of this Agreement by Sponsor does not, and the performance by Sponsor
of its obligations hereunder will not, (A) conflict with or result in a violation of the organizational documents of Sponsor, or
(B) require any consent or approval that has not been given or other action that has not been taken by any third party (including
under any Contract binding upon Sponsor or Sponsor’s Subject ACTC Equity Securities), in each case, to the extent such consent,
approval or other action would prevent, enjoin or materially delay the performance by Sponsor of its obligations under this Agreement;
(iii) there are no Actions pending against Sponsor or, to the knowledge of Sponsor, threatened against Sponsor, before (or, in
the case of threatened Actions, that would be before) any arbitrator or any Governmental Authority, which in any manner challenges
or seeks to prevent, enjoin or materially delay the performance by Sponsor of its obligations under this Agreement.

 

    3

     

    

 

b. Each Class B Holder
represents and warrants to the Company as follows: (i) this Agreement has been duly executed and delivered by such Class B Holder
and, assuming due authorization, execution and delivery by the other parties to this Agreement, this Agreement constitutes a legally
valid and binding obligation of such Class B Holder, enforceable against such Class B Holder in accordance with the terms hereof
(except as enforceability may be limited by bankruptcy Laws, other similar Laws affecting creditors’ rights and general principles
of equity affecting the availability of specific performance and other equitable remedies); (ii) such Class B Holder has not entered
into, and shall not enter into, any agreement that would restrict, limit or interfere with the performance of such Class B Holder’s
obligations hereunder and (iii) such Class B Holder is the record and beneficial owner of all of its Subject ACTC Equity Securities,
and there exist no Liens or any other limitation or restriction (including, without limitation, any restriction on the right to
vote, sell or otherwise dispose of such securities), other than pursuant to (A) this Agreement, (B) the Acquiror Organizational
Documents, (C) the Merger Agreement, (D) the Class B Holder Agreement or (E) any applicable securities Laws.

 

7. Termination.
This Agreement shall automatically terminate, without any notice or other action by any Party, and be void ab initio upon
the earlier of (a) the Effective Time and (b) the termination of the Merger Agreement in accordance with its terms. Upon termination
of this Agreement as provided in the immediately preceding sentence, none of the Parties shall have any further obligations or
liabilities under, or with respect to, this Agreement. Notwithstanding the foregoing or anything to the contrary in this Agreement,
(i) the termination of this Agreement pursuant to Section 7(b) shall not affect any liability on the part of any Party for
a Willful Breach of any covenant or agreement set forth in this Agreement prior to such termination or Fraud, (ii) Sections
2, 5 and 11 (solely to the extent related to the foregoing Sections 2 or 5) shall each survive
the termination of this Agreement pursuant to Section 7(a), (iii) Sections 4(b) and 11 (solely to the extent
related to the foregoing Section 4(b)) shall each survive the termination of this Agreement pursuant to Section 7(a)
and (iv) Sections 8, 9, 10 and 11 (solely to the extent related to the following Sections 8
or 10) shall survive any termination of this Agreement. For purposes of this Section 7, (x) “Willful Breach”
means a material breach that is a consequence of an act undertaken or a failure to act by the breaching Party with the knowledge
that the taking of such act or such failure to act would, or would reasonably be expected to, constitute or result in a breach
of this Agreement and (y) “Fraud” means an act or omission by a Party, and requires: (i) a false or incorrect representation
or warranty expressly set forth in this Agreement, (ii) with actual knowledge (as opposed to constructive, imputed or implied knowledge)
by the Party making such representation or warranty that such representation or warranty expressly set forth in this Agreement
is false or incorrect, (iii) an intention to deceive another Party, to induce him, her or it to enter into this Agreement, (iv)
another Party, in justifiable or reasonable reliance upon such false or incorrect representation or warranty expressly set forth
in this Agreement, causing such Party to enter into this Agreement, and (v) causing such Party to suffer damage by reason of such
reliance.

 

8. No Recourse.
Except for claims pursuant to the Merger Agreement or any other Ancillary Agreement by any party(ies) thereto against any other
party(ies) thereto, each Party agrees that (a) this Agreement may only be enforced against, and any action for breach of this Agreement
may only be made against, the Parties, and no claims of any nature whatsoever (whether in tort, contract or otherwise) arising
under or relating to this Agreement, the negotiation hereof or its subject matter, or the transactions contemplated hereby shall
be asserted against any Affiliate of the Company or any Affiliate of ACTC (other than the Class B Holders, on the terms and subject
to the conditions set forth herein), and (b) none of the Affiliates of the Company or the Affiliates of ACTC (other than the Class
B Holders, on the terms and subject to the conditions set forth herein) shall have any liability arising out of or relating to
this Agreement, the negotiation hereof or its subject matter, or the transactions contemplated hereby, including with respect to
any claim (whether in tort, contract or otherwise) for breach of this Agreement or in respect of any written or oral representations
made or alleged to be made in connection herewith, as expressly provided herein, or for any actual or alleged inaccuracies, misstatements
or omissions with respect to any information or materials of any kind furnished in connection with this Agreement, the negotiation
hereof or the transactions contemplated hereby.

 

    4

     

    

 

9. Fiduciary Duties.
Notwithstanding anything in this Agreement to the contrary, (a) each Class B Holder makes no agreement or understanding herein
in any capacity other than in its capacity as a record holder and beneficial owner of the Subject ACTC Equity Securities and (b)
nothing herein will be construed to limit or affect any action or inaction by any representative of the Sponsor in its capacity
as a member of the board of directors (or other similar governing body) of ACTC or any of its Affiliates or as an officer, employee
or fiduciary of ACTC or any of its Affiliates, in each case, acting in such person’s capacity as a director, officer, employee
or fiduciary of ACTC or such Affiliate.

 

10. No Third Party
Beneficiaries. This Agreement shall be for the sole benefit of the Parties and their respective successors and permitted assigns
and is not intended, nor shall be construed, to give any Person, other than the Parties and their respective successors and assigns,
any legal or equitable right, benefit or remedy of any nature whatsoever by reason this Agreement. Nothing in this Agreement, expressed
or implied, is intended to or shall constitute the Parties, partners or participants in a joint venture.

 

11. Incorporation
by Reference. Sections 1.02 (Construction) 11.03 (Assignment), 11.06 (Governing Law), 11.07 (Captions; Counterparts), 11.09
(Entire Agreement), 11.10 (Amendments), 11.11 (Severability), 11.12 (Jurisdiction; Waiver of Jury Trial), 11.13 (Enforcement) and
11.15 (Non-Survival of Representations, Warranties and Covenants) of the Merger Agreement are incorporated herein by reference
and shall apply to this Agreement mutatis mutandis.

 

[signature page follows]

 

    5

     

    

 

IN WITNESS WHEREOF, each of the Parties
has caused this Agreement to be duly executed on its behalf as of the day and year first above written.

 

	 	ArcLight CTC Holdings, L.P.
	 	 
	 	By:	/s/ Daniel R. Revers
	 	 	Name: Daniel R. Revers
	 	 	Title: President

 

	 	ARCLIGHT CLEAN TRANSITION CORP.
	 	 
	 	By:	/s/ John F. Erhard
	 	 	Name: John F. Erhard
	 	 	Title: Chief Executive Officer

 

[Signature
Page to Sponsor Support Agreement]

 

     

     

    

 

	 	PROTERRA INC
	 	 
	 	By:	/s/ Jack Allen
	 	 	Name: Jack Allen
	 	 	Title: Chief Executive Officer

 

[Signature
Page to Sponsor Support Agreement]

 

     

     

    

 

	 	OTHER CLASS B HOLDERS:
	 	 
	 	 
	 	Daniel R. Revers
	 	 
	 	 
	 	Arno Harris
	 	 
	 	 
	 	Audrey Lee
	 	 
	 	 
	 	Brian Goncher
	 	 
	 	 
	 	Steven Berkenfeld

 

[Signature
Page to Sponsor Support Agreement]Exhibit 10.3

 

SPONSOR LETTER AGREEMENT

 

This SPONSOR LETTER
AGREEMENT (this “Agreement”), dated as of January 11, 2021, is made
by and among ArcLight CTC Holdings, L.P., a Delaware limited partnership (the “Sponsor”), ArcLight Clean Transition
Corp., a Cayman Islands exempted company (“ACTC”), and Proterra Inc, a Delaware corporation (the “Company”).
The Sponsor, ACTC and the Company are sometimes referred to herein individually as a “Party” and collectively
as the “Parties”. Capitalized terms used but not otherwise defined herein shall have the meanings ascribed to
such terms in the Merger Agreement (as defined below).

 

WHEREAS, Sponsor holds
6,797,500 Class B ordinary shares of ACTC (“ACTC Class B Shares”);

 

WHEREAS, ACTC, the
Company and Phoenix Merger Sub, Inc., a Delaware corporation, entered into that certain Merger Agreement, dated as of the date
hereof (as it may be amended, restated or otherwise modified from time to time in accordance with its terms, the “Merger
Agreement”);

 

WHEREAS, pursuant to
their terms, all of the ACTC Class B Shares shall be converted into Acquiror Common Stock at the time of consummation of the Merger
(the “Conversion”); and

 

WHEREAS, the Merger
Agreement contemplates that the Parties will enter into this Agreement contemporaneously with the execution and delivery of the
Merger Agreement by the parties thereto.

 

NOW, THEREFORE, in
consideration of the premises and the mutual promises contained herein and for other good and valuable consideration, the receipt
and sufficiency of which are hereby acknowledged, the Parties, each intending to be legally bound, hereby agree as follows:

 

1. Vesting and Forfeiture. The Sponsor agrees that, as of immediately following the Closing and the Conversion, 10%
of the Acquiror Common Stock beneficially owned by the Sponsor immediately following the Closing and the Conversion shall be subject
to the vesting and forfeiture provisions set forth in this Section 1. For the avoidance of doubt, any Acquiror Common Stock
beneficially owned by any individual other than the Sponsor and any Acquiror Common Stock beneficially owned by the Sponsor, other
than the Acquiror Common Stock described in the foregoing sentence, shall not be subject to vesting or forfeiture. The Sponsor
agrees that it shall not, and shall cause its Affiliates not to, Transfer (other than to an Affiliate) any unvested Acquiror Common
Stock held by the Sponsor prior to the date such Acquiror Common Stock becomes vested pursuant to Section 1(a).

 

a. 
Vesting of Acquiror Common Stock.

 

(i) 
10% of the Acquiror Common Stock beneficially owned by the Sponsor immediately following the
Closing and the Conversion shall vest if, (A) over any twenty (20) Trading Days within any thirty (30) Trading Day period during
the sixty (60) months following the Closing (the “Measurement Period”) the VWAP of the Acquiror Common Stock
is greater than or equal to $15.00 per share (in which case, such Acquiror Common Stock shall vest upon the close of market on
the twentieth (20th) such Trading Day) or (B) there occurs any transaction resulting in a Change in Control with a valuation
of the Acquiror Common Stock that is greater than or equal to $15.00 per share of Acquiror Common Stock (in which case, such Acquiror
Common Stock shall vest immediately prior to the closing of such Change in Control). 

 

(ii) 
The per share stock prices referenced in Section 1(a)(ii) above will be equitably adjusted
on account of any changes in the equity securities of ACTC by way of stock split, stock dividend, combination or reclassification,
or through merger, consolidation, reorganization, recapitalization or business combination, or by any other means.

 

     

     

    

 

2. 
Tax Treatment. The Parties intend that the Conversion will be treated as a tax-free recapitalization under Section
368(a)(1)(E) of the Internal Revenue Code of 1986, as amended (the “Code”), and the Sponsor intends to make
a protective election under Section 83(b) of the Code with respect to the receipt of the portion of the Acquiror Common Stock subject
to vesting under Section 1(a)(ii) of this Agreement.

 

3. 
Forfeiture of Unvested Acquiror Common Stock. Any Acquiror Common Stock that remains unvested pursuant to Section
1(a)(ii) as of the expiration of the Measurement Period shall be forfeited and shall be transferred by the Sponsor to ACTC
for cancellation, without any consideration for such transfer.

 

4. 
Lock-Up.

 

a. 
Subject to Section 4(b), the Sponsor hereby agrees that it shall not, and shall cause any of its Permitted Transferees
not to, Transfer any Lock-up Shares until the end of the Lock-up Period (the “Lock-up”).

 

b. 
Notwithstanding the provisions set forth in Section 4(a), the Sponsor or its Permitted Transferees may Transfer the
Lock-up Shares during the Lock-up Period (i) to (A) ACTC’s officers or directors or (B) any Affiliates of the Sponsor; (ii)
in the case of an individual, by gift to a member of such individual’s immediate family or to a trust, the beneficiary of
which is a member of such individual’s immediate family, an Affiliate of such individual or to a charitable organization;
(iii) in the case of an individual, by virtue of laws of descent and distribution upon death of such individual; or (iv) by virtue
of the laws of the State of Delaware or the Sponsor limited partnership agreement upon dissolution of the Sponsor.

 

c. 
For purposes of this Agreement:

 

(i) 
the term “Lock-up Period” means the period beginning on the Closing Date
and ending on the date that is 180 days after the Closing Date; provided, that the Parties may mutually agree to shorten the duration
of or otherwise waive the Lock-up Period;

 

(ii) 
the term “Lock-up Shares” means the shares of Acquiror Common Stock and
Acquiror Warrants (including the shares of Acquiror Common Stock issuable upon exercise thereof) held by the Sponsor immediately
following the Closing (other than shares of Acquiror Common Stock acquired in the public market or pursuant to a transaction exempt
from registration under the Securities Act, pursuant to a subscription agreement where the issuance of Acquiror Common Stock occurs
on or after the Closing); provided, that, for clarity, shares of Acquiror Common Stock issued in connection with the PIPE investment
described in Section 5.21 of the Merger Agreement shall not constitute Lock-up Shares;

 

(iii) 
the term “Permitted Transferees” means, prior to the expiration of the
Lock-up Period, any Person to whom the Sponsor is permitted to transfer such Lock-up Shares prior to the expiration of the Lock-up
Period pursuant to Section 4(b); and

 

(iv) 
the term “Transfer” means the (A) sale 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 or establishment
or increase of a put equivalent position or liquidation with respect to or decrease of a call equivalent position within the meaning
of Section 16 of the Exchange Act, and the rules and regulations promulgated thereunder, with respect to, any security, (B) entry
into any swap or other arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership
of any security, whether any such transaction is to be settled by delivery of such securities, in cash or otherwise, or (C) public
announcement of any intention to effect any transaction specified in clause (A) or (B). 

 

    2

     

    

 

d. 
Notwithstanding anything to the contrary in this Agreement, any waiver, termination, shortening or other amendment or modification
to any lock-up agreement applicable to the Acquiror Common Stock held by any Company Stockholder which improves the terms of any
such lock-up for such Company Stockholder shall apply pro rata and on the same terms to the Lock-Up of the Sponsor hereunder and
the provisions of this Section 4 shall be deemed immediately and automatically waived, terminated, shortened or amended
or modified, as the case may be, without further action of the Parties.

 

e. 
From and after the Closing, prior to waiving, terminating, shortening or otherwise amending or modifying the terms of any
lock-up agreement applicable to the Acquiror Common Stock held by any Company Stockholder, ACTC will provide reasonable advance
written notice (in no case less than five (5) Trading Days) to the Sponsor, indicating that ACTC plans to take a specified action
with respect to such lock-up agreement and setting forth the terms of any such waiver, termination, shortening or other amendment
or modification.

 

5. 
New Shares. In the event that (a) any Acquiror Common Stock, Acquiror Warrants or other equity securities
of ACTC are issued to the Sponsor after the date of this Agreement pursuant to any stock dividend, stock split, recapitalization,
reclassification, combination or exchange of Acquiror Common Stock or Acquiror Warrants of, on or affecting the Acquiror Common
Stock or Acquiror Warrants owned by the Sponsor or otherwise, (b) the Sponsor purchases or otherwise acquires beneficial ownership
of any Acquiror Common Stock, Acquiror Warrants or other equity securities of ACTC after the date of this Agreement, or (c) the
Sponsor acquires the right to vote or share in the voting of any Acquiror Common Stock or other equity securities of ACTC after
the date of this Agreement (such Acquiror Common Stock, Acquiror Warrants or other equity securities of ACTC, collectively the
“New Securities”), then such New Securities acquired or purchased by the Sponsor
shall become Lock-Up Shares, to the extent such New Securities are not otherwise expressly excluded from the definition of “Lock-Up
Shares”, subject to the terms of this Agreement to the same extent as if they constituted the Acquiror Common Stock or Acquiror
Warrants owned by such Sponsor as of the date hereof.

 

6. 
Sponsor Director. Pursuant to the Merger Agreement, the Acquiror Director Designee shall be appointed to the
Acquiror Board, effective as of immediately following the Effective Time, and shall serve until his or her earlier resignation,
removal or death; provided that, the Sponsor agrees to cause the Acquiror Director Designee to tender his or her immediate irrevocable
resignation in writing to the Acquiror Board in the event the Sponsor sells, disposes of, transfers or assigns (other than to an
Affiliate of Sponsor) fifty percent (50%) or more of the Acquiror Common Stock held beneficially by Sponsor as of the Closing.

 

7. 
Termination. This Agreement shall automatically terminate, without any notice or other action by any Party, and be
void ab initio upon the termination of the Merger Agreement in accordance with its terms. Upon termination of this Agreement
as provided in the immediately preceding sentence, none of the Parties shall have any further obligations or Liabilities under,
or with respect to, this Agreement.

 

8. 
No Third Party Beneficiaries. This Agreement shall be for the sole benefit of the Parties and their respective successors
and permitted assigns and is not intended, nor shall be construed, to give any Person, other than the Parties and their respective
successors and assigns, any legal or equitable right, benefit or remedy of any nature whatsoever by reason this Agreement. Nothing
in this Agreement, expressed or implied, is intended to or shall constitute the Parties, partners or participants in a joint venture.

 

9. 
Incorporation by Reference. Section 1.2 (Construction) 11.03 (Assignment), 11.06 (Governing Law), 11.07 (Captions;
Counterparts), 11.09 (Entire Agreement), 11.10 (Amendments), 11.11 (Severability), 11.12 (Jurisdiction; Waiver of Jury Trial),
11.13 (Enforcement), 11.14 (Non-Recourse) and 11.15 (Non-Survival) of the Merger Agreement are incorporated herein and shall apply
to this Agreement mutatis mutandis.

 

[signature page follows]

 

    3

     

    

 

IN WITNESS WHEREOF, each of the Parties
has caused this Agreement to be duly executed on its behalf as of the day and year first above written.

 

	 	ArcLight CTC Holdings, L.P.
	 	 
	 	By: ACTC Holdings GP, LLC, its General Partner
	 	 
	 	By:	/s/ Daniel R. Revers
	 	 	Name: Daniel R. Revers
	 	 	Title: President
	 	 
	 	ARCLIGHT CLEAN TRANSITION CORP.
	 	 
	 	By:	/s/ John F. Erhard
	 	 	Name: John F. Erhard
	 	 	Title: President and Chief Executive Officer

 

 

[Signature
Page to Sponsor Letter Agreement]

 

     

     

    

 

	 	PROTERRA INC
	 	 
	 	By:	/s/ Jack Allen
	 	 	Name: Jack Allen
	 	 	Title: Chief Executive Officer

 

 

[Signature
Page to Sponsor Letter Agreement]

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00319-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00319-of-00352.parquet"}]]