Document:

Exhibit 4.1

 

	NUMBER	UNITS

U-

 

SPECIMEN UNIT CERTIFICATE

 

SEE REVERSE FOR CERTAIN DEFINITIONS

 

CUSIP [●]

 

STAR PEAK ENERGY TRANSITION CORP.

 

UNITS CONSISTING OF ONE SHARE OF CLASS A
COMMON STOCK AND ONE-THIRD OF ONE 

WARRANT TO PURCHASE ONE SHARE OF CLASS A COMMON STOCK

 

THIS CERTIFIES THAT____________________is
the owner of___________Units.

 

Each Unit (“Unit”)
consists of one (1) share of Class A common stock, par value $0.0001 per share (“Common Stock”),
of Star Peak Energy Transition Corp., a Delaware corporation (the “Company”), and one-third (1/3) of
one warrant (each whole warrant, a “Warrant”).  Each Warrant entitles the holder to purchase one
(1) share (subject to adjustment) of Common Stock for $11.50 per share (subject to adjustment).  Each Warrant will become
exercisable on the later of (i) thirty (30) days after the Company’s completion of a merger, capital stock exchange,
asset acquisition, stock purchase, reorganization or other similar business combination with one or more businesses (each a “Business
Combination”), and (ii) twelve (12) months from the closing of the Company’s initial public offering,
and will expire unless exercised before 5:00 p.m., New York City Time, on the date that is five (5) years after the date on
which the Company completes its initial Business Combination, or earlier upon redemption or liquidation (the “Expiration
Date”).  The Common Stock and Warrants comprising the Units represented by this certificate are not transferable
separately prior to               , 2020, unless Credit Suisse
Securities (USA) LLC elects to allow earlier separate trading, subject to the Company’s filing with the Securities and Exchange
Commission of a Current Report on Form 8-K containing an audited balance sheet reflecting the Company’s receipt of the
gross proceeds of the Company’s initial public offering and issuing a press release announcing when separate trading will
begin. No fractional warrants will be issued upon separation of the Units and only whole warrants are exercisable.  The terms
of the Warrants are governed by a Warrant Agreement, dated as of               ,
2020, between the Company and Continental Stock Transfer & Trust Company, as Warrant Agent, and are subject to the terms
and provisions contained therein, all of which terms and provisions the holder of this certificate consents to by acceptance hereof. 
Copies of the Warrant Agreement are on file at the office of the Warrant Agent at 1 State Street, 30th Floor, New York, New York
10004, and are available to any Warrant holder on written request and without cost.

 

Upon the consummation of the Business Combination,
the Units represented by this certificate will automatically separate into the Class A Common Stock and Warrants comprising such
Units.

 

This certificate is not valid unless countersigned
by the Transfer Agent and Registrar of the Company.

 

This certificate shall be governed by and
construed in accordance with the internal laws of the State of New York.

 

     

     

    

 

Witness the facsimile signatures of its
duly authorized officers.

 

	 	 	 
	Secretary	 	Chief Financial Officer

 

     

     

    

 

Star Peak Energy Transition Corp.

 

The Company will furnish without charge
to each unitholder who so requests, a statement of the powers, designations, preferences and relative, participating, optional
or other special rights of each class of stock or series thereof of the Company and the qualifications, limitations, or restrictions
of such preferences and/or rights.

 

The following abbreviations, when used in
the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable
laws or regulations: 

 

	TEN COM	—	as tenants in common	UNIF GIFT MIN

 ACT	—	 	Custodian	 
	TEN ENT	—	as tenants by the entireties	 	 	(Cust)	 	(Minor)
	JT TEN	—	as joint tenants with right of survivorship and not as tenants in common	 	 	under Uniform Gifts to Minors Act
	 	 	 	 	 	(State)

Additional abbreviations may also be used
though not in the above list.

 

     

     

    

 

For value received,________________hereby sells, assigns
and transfers unto                    

 

 

PLEASE INSERT
SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER OF ASSIGNEE

 

 

(PLEASE PRINT
OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)

 

________________________________________Units
represented by the within Certificate, and does hereby irrevocably constitute and appoint__________________________Attorney
to transfer the said Units on the books of the within named Company with full power of substitution in the premises.

  

	Dated____________
	 
	 	Notice: The signature to this assignment must correspond with the name as written upon the face of the certificate in every particular, without alteration or enlargement or any change whatever.

 

	Signature(s) Guaranteed:	 	 
	 	 	 
	 	 	 
	THE SIGNATURE(S) MUST BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM, PURSUANT TO S.E.C. RULE 17Ad-15 OR ANY SUCCESSOR RULES).

 

In each case, as more fully described
in the Company’s final prospectus
dated                    ,
2020, the holder(s) of this certificate shall be entitled to receive a pro-rata portion of certain funds held in the
trust account established in connection with the Company’s initial public offering only in the event that (i) the
Company redeems the shares of Common Stock sold in its initial public offering and liquidates because it does not consummate
an initial business combination within the period of time set forth in the Company’s amended and restated certificate
of incorporation, as the same may be amended from time to time, (ii) the Company redeems the shares of Common Stock sold
in its initial public offering in connection with a stockholder vote to amend the Company’s amended and restated
certificate of incorporation (A) that would modify the substance or timing of the Company’s obligation to provide
holders of the Common Stock the right to have their shares redeemed in connection with the Company’s initial business
combination or to redeem 100% of the Common Stock if the Company does not complete its initial business combination within
the time period set forth therein or (B) with respect to any other provision relating to the rights of holders of Common
Stock, or (iii) if the holder(s) seek(s) to redeem for cash his, her or its respective shares of Common Stock
in connection with a tender offer (or proxy solicitation, solely in the event the Company seeks stockholder approval of the
proposed initial business combination) setting forth the details of a proposed initial business combination.  In no
other circumstances shall the holder(s) have any right or interest of any kind in or to the trust account.Exhibit 4.2

 

	NUMBER	SHARES

C-

 

SEE REVERSE FOR

CERTAIN DEFINITIONS

 

CUSIP [●]

 

SPECIMEN CLASS A COMMON STOCK CERTIFICATE

 

STAR PEAK ENERGY TRANSITION
CORP.

 

INCORPORATED UNDER THE
LAWS OF THE STATE OF DELAWARE CLASS A COMMON STOCK

 

This Certifies that ___________________________is the owner
of _______________

 

FULLY PAID AND NON-ASSESSABLE SHARES
OF THE PAR VALUE OF $0.0001 EACH OF THE CLASS A COMMON STOCK OF STAR PEAK ENERGY TRANSITION CORP. (THE
“COMPANY”)

 

subject to the Company’s amended and
restated certificate of incorporation, as the same may be amended from time to time, and transferable on the books of the Company
in person or by duly authorized attorney upon surrender of this certificate properly endorsed.

 

The Company will be forced to redeem all
of its shares of Class A common stock if it is unable to complete a business combination within the period set forth in the Company’s
amended and restated certificate of incorporation, as the same may be amended from time to time, all as more fully described in
the Company’s final prospectus dated               , 2020.

 

This certificate is not valid unless countersigned
by the Transfer Agent and registered by the Registrar.

 

Witness the seal of the Company and the
facsimile signatures of its duly authorized officers.

 

Dated:                      

 

	Chief Executive Officer	[Corporate Seal]	Chief Financial Officer
	 	Delaware	 

 

     

     

    

 

STAR PEAK ENERGY TRANSITION CORP.

 

The Company will furnish without charge to each stockholder
who so requests the powers, designations, preferences and relative, participating, optional or other special rights of each class
of stock or series thereof of the Company and the qualifications, limitations, or restrictions of such preferences and/or rights.
This certificate and the shares represented thereby are issued and shall be held subject to all the provisions of the Company’s
amended and restated certificate of incorporation, as the same may be amended from time to time and resolutions of the Board of
Directors providing for the issue of securities (copies of which may be obtained from the secretary of the Company), to all of
which the holder of this certificate by acceptance hereof assents.

 

The following abbreviations, when used in the inscription on
the face of this certificate, shall be construed as though they were written out in full according to applicable laws or regulations:

 

	TEN COM	—	as tenants in common	UNIF GIFT 

MIN ACT	—	 	Custodian	 
	TEN ENT	—	as tenants by the entireties	 	 	(Cust)	 	(Minor)
	JT TEN	—	as joint tenants with right of survivorship and not as tenants in common	 	 	
        under Uniform Gifts to Minors
        Act

         

	 	 	 	 	 	(State)

 

Additional abbreviations may also be
used though not in the above list.

 

     

     

    

 

For value received,                                       
  hereby sells, assigns and transfers unto

 

 

(PLEASE
INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER(S) OF ASSIGNEE(S))

 

 

(PLEASE
PRINT OR TYPEWRITE NAME(S) AND ADDRESS(ES), INCLUDING ZIP CODE, OF ASSIGNEE(S))

 

 

Shares of
the capital stock represented by the within Certificate, and does hereby irrevocably constitute and appoint

 

 

Attorney
to transfer the said stock on the books of the within named Company with full power of substitution in the premises.

 

Dated:__________

 

 

Shareholder

 

NOTICE: THE SIGNATURE(S) TO THIS
ASSIGNMENT MUST CORRESPOND WITH THE NAME AS WRITTEN UPON THE FACE OF THE CERTIFICATE IN EVERY PARTICULAR, WITHOUT ALTERATION OR
ENLARGEMENT OR ANY CHANGE WHATEVER.

 

Signature(s) Guaranteed:

By

 

 

 

 

 

 

THE SIGNATURE(S) MUST BE GUARANTEED BY AN ELIGIBLE GUARANTOR
INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE
MEDALLION PROGRAM, PURSUANT TO S.E.C. RULE 17Ad-15 (OR ANY SUCCESSOR RULE).

 

     

     

    

 

In each case, as more fully described in
the Company’s final prospectus
dated                  , 2020, the
holder(s) of this certificate shall be entitled to receive a pro-rata portion of certain funds held in the trust account
established in connection with its initial public offering only in the event that (i) the Company redeems the shares of Class
A common stock sold in its initial public offering and liquidates because it does not consummate an initial business
combination within the period of time set forth in the Company’s amended and restated certificate of incorporation, as
the same may be amended from time to time, (ii) the Company redeems the shares of Class A common stock sold in its initial
public offering in connection with a stockholder vote to amend the Company’s amended and restated certificate of
incorporation to modify the substance or timing of the Company’s obligation to provide holders of the Class A common
stock the right to have their shares redeemed in connection with the Company’s initial business combination or to
redeem 100% of the Class A common stock if the Company does not complete its initial business combination within the time
period set forth therein or with respect to any other provision relating to the rights of holders of the Class A common stock
or (iii) if the holder(s) seek(s) to redeem for cash his, her or its respective shares of Class A common stock in connection
with a tender offer (or proxy solicitation, solely in the event the Company seeks stockholder approval of the proposed
initial business combination) setting forth the details of a proposed initial business combination. In no other circumstances
shall the holder(s) have any right or interest of any kind in or to the trust account.

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