Exhibit 4.3


 


Form of Warrant Certificate


 


[FACE]


 


Number


 


Warrants


 


THIS WARRANT SHALL BE VOID IF NOT EXERCISED
PRIOR TO

THE EXPIRATION OF THE EXERCISE PERIOD PROVIDED FOR

IN THE WARRANT AGREEMENT DESCRIBED BELOW


 


POWER & DIGITAL INFRASTRUCTURE
ACQUISITION CORP.


 


Incorporated Under the Laws of the State
of Delaware


 


CUSIP


 


Warrant Certificate


 


This Warrant Certificate certifies that           ,
or registered assigns, is the registered holder of                     warrant(s) evidenced hereby (the “Warrants” and
each, a “Warrant”) to purchase shares of Class A common stock, $0.0001 par value per share (the “Common
Stock”), of Power & Digital Infrastructure Acquisition Corp., a Delaware corporation (the “Company”).
Each Warrant entitles the holder, upon exercise during the period set forth in the Warrant Agreement referred to below, to receive
from the Company that number of fully paid and non-assessable shares of Common Stock as set forth below, at the exercise price
(the “Exercise Price”) as determined pursuant to the Warrant Agreement, payable in lawful money (or through
“cashless exercise” as provided for in the Warrant Agreement) of the United States of America upon surrender of this
Warrant Certificate and payment of the Exercise Price at the office or agency of the Warrant Agent referred to below, subject to
the conditions set forth herein and in the Warrant Agreement. Defined terms used in this Warrant Certificate but not defined herein
shall have the meanings given to them in the Warrant Agreement.


 


Each whole Warrant is initially exercisable for one fully paid
and non-assessable share of Common Stock. No fractional shares will be issued upon exercise of any Warrant. If, upon the exercise
of Warrants, a holder would be entitled to receive a fractional interest in a share of Common Stock, the Company will, upon exercise,
round down to the nearest whole number the number of shares of Common Stock to be issued to the Warrant holder. The number of shares
of Common Stock issuable upon exercise of the Warrants is subject to adjustment upon the occurrence of certain events as set forth
in the Warrant Agreement.


 


The initial Exercise Price per share of Common Stock for any
Warrant is equal to $11.50 per share. The Exercise Price is subject to adjustment upon the occurrence of certain events set forth
in the Warrant Agreement.


 


Subject to the conditions set forth in the Warrant Agreement,
the Warrants may be exercised only during the Exercise Period and to the extent not exercised by the end of such Exercise Period,
such Warrants shall become void. The Warrants may be redeemed, subject to certain conditions, as set forth in the Warrant Agreement.


 






     


     


    

 


Reference is hereby made to the further provisions of this Warrant
Certificate set forth on the reverse hereof and such further provisions shall for all purposes have the same effect as though fully
set forth at this place.


 


This Warrant Certificate shall not be valid unless countersigned
by the Warrant Agent, as such term is used in the Warrant Agreement.


 


This Warrant Certificate shall be governed by and construed
in accordance with the internal laws of the State of New York, without regard to conflicts of laws principles thereof.


 


		POWER & DIGITAL INFRASTRUCTURE ACQUISITION CORP.
	 	 	 
	 	By:	                   
		Name:	 
	 	Title:	 
	 	 	 
	 	CONTINENTAL STOCK TRANSFER & TRUST COMPANY, as Warrant Agent
	 	 	 
	 	By:	 
		Name:	 
	 	Title:	 



 




    2


     


    

 


Form of Warrant Certificate


 


[Reverse]


 


The Warrants evidenced by this Warrant Certificate are part
of a duly authorized issue of Warrants entitling the holder on exercise to receive shares of Common Stock and are issued or to
be issued pursuant to a Warrant Agreement dated as of                  ,
2021 (the “Warrant Agreement”), duly executed and delivered by the Company to Continental Stock Transfer
& Trust Company, a New York corporation, as warrant agent (the “Warrant Agent”), which Warrant Agreement
is hereby incorporated by reference in and made a part of this instrument and is hereby referred to for a description of the rights,
limitation of rights, obligations, duties and immunities thereunder of the Warrant Agent, the Company and the holders (the words
“holders” or “holder” meaning the Registered Holders or Registered Holder,
respectively) of the Warrants. A copy of the Warrant Agreement may be obtained by the holder hereof upon written request to the
Company. Defined terms used in this Warrant Certificate but not defined herein shall have the meanings given to them in the Warrant
Agreement.


 


Warrants may be exercised at any time during the Exercise Period
set forth in the Warrant Agreement. The holder of Warrants evidenced by this Warrant Certificate may exercise them by surrendering
this Warrant Certificate, with the form of election to purchase set forth hereon properly completed and executed, together with
payment of the Exercise Price as specified in the Warrant Agreement (or through “cashless exercise” as provided for
in the Warrant Agreement) at the principal corporate trust office of the Warrant Agent. In the event that upon any exercise of
Warrants evidenced hereby the number of Warrants exercised shall be less than the total number of Warrants evidenced hereby, there
shall be issued to the holder hereof or his, her or its assignee, a new Warrant Certificate evidencing the number of Warrants not
exercised.


 


Notwithstanding anything else in this Warrant Certificate or
the Warrant Agreement, no Warrant may be exercised unless at the time of exercise (i) a registration statement covering the shares
of Common Stock to be issued upon exercise is effective under the Securities Act and (ii) a prospectus thereunder relating to the
shares of Common Stock is current, except through “cashless exercise” as provided for in the Warrant Agreement.


 


The Warrant Agreement provides that upon the occurrence of certain
events the number of shares of Common Stock issuable upon exercise of the Warrants set forth on the face hereof may, subject to
certain conditions, be adjusted. If, upon exercise of a Warrant, the holder thereof would be entitled to receive a fractional interest
in a share of Common Stock, the Company shall, upon exercise, round down to the nearest whole number of shares of Common Stock
to be issued to the holder of the Warrant.


 


Warrant Certificates, when surrendered at the principal corporate
trust office of the Warrant Agent by the Registered Holder thereof in person or by legal representative or attorney duly authorized
in writing, may be exchanged, in the manner and subject to the limitations provided in the Warrant Agreement, but without payment
of any service charge, for another Warrant Certificate or Warrant Certificates of like tenor evidencing in the aggregate a like
number of Warrants.


 


Upon due presentation for registration of transfer of this Warrant
Certificate at the office of the Warrant Agent a new Warrant Certificate or Warrant Certificates of like tenor and evidencing in
the aggregate a like number of Warrants shall be issued to the transferee(s) in exchange for this Warrant Certificate, subject
to the limitations provided in the Warrant Agreement, without charge except for any tax or other governmental charge imposed in
connection therewith.


 


The Company and the Warrant Agent may deem and treat the Registered
Holder(s) hereof as the absolute owner(s) of this Warrant Certificate (notwithstanding any notation of ownership or other writing
hereon made by anyone), for the purpose of any exercise hereof, of any distribution to the holder(s) hereof, and for all other
purposes, and neither the Company nor the Warrant Agent shall be affected by any notice to the contrary. Neither the Warrants nor
this Warrant Certificate entitles any holder hereof to any rights of a stockholder of the Company.


 







    3


     


    

 


Election to Purchase


 


(To Be Executed Upon Exercise
of Warrant)


 


The undersigned hereby irrevocably elects to exercise the right,
represented by this Warrant Certificate, to receive shares of Common Stock and herewith tenders payment for such shares of Common
Stock to the order of Power & Digital Infrastructure Acquisition Corp. (the “Company”) in the amount
of $              in accordance with the terms hereof. The undersigned requests that a certificate for such shares of Common Stock be registered
in the name of                 , whose address is                         and that such shares of Common Stock be delivered to                  whose address is                 . If
said number of shares of Common Stock is less than all of the shares of Common Stock purchasable hereunder, the undersigned requests
that a new Warrant Certificate representing the remaining balance of such shares of Common Stock be registered in the name of        ,
                whose address is                 and that such Warrant Certificate be delivered to                 , whose address is                         .


 


In the event that the Warrant has been called for redemption
by the Company pursuant to Section 6.2 of the Warrant Agreement and a holder thereof elects to exercise its Warrant pursuant
to a Make-Whole Exercise, the number of shares of Common Stock that this Warrant is exercisable for shall be determined in accordance
with subsection 3.3.1(c) or Section 6.2 of the Warrant Agreement, as applicable.


 


In the event that the Warrant is a Private Placement Warrant
that is to be exercised on a “cashless” basis pursuant to subsection 3.3.1(c) of the Warrant Agreement, the number
of shares of Common Stock that this Warrant is exercisable for shall be determined in accordance with subsection 3.3.1(c) of the
Warrant Agreement, as applicable.


 


In the event that the Warrant is to be exercised on a “cashless”
basis pursuant to Section 7.4 of the Warrant Agreement, the number of shares of Common Stock that this Warrant is exercisable for
shall be determined in accordance with Section 7.4 of the Warrant Agreement.


 


In the event that the Warrant may be exercised, to the extent
allowed by the Warrant Agreement, through cashless exercise (i) the number of shares of Common Stock that this Warrant is exercisable
for would be determined in accordance with the relevant section of the Warrant Agreement which allows for such cashless exercise
and (ii) the holder hereof shall complete the following: The undersigned hereby irrevocably elects to exercise the right, represented
by this Warrant Certificate, through the cashless exercise provisions of the Warrant Agreement, to receive shares of Common Stock.
If said number of shares is less than all of the shares of Common Stock purchasable hereunder (after giving effect to the cashless
exercise), the undersigned requests that a new Warrant Certificate representing the remaining balance of such shares of Common
Stock be registered in the name of                , whose address is and that such Warrant Certificate be delivered to        , whose address is                .


 


[Signature Page Follows]


 




     


     


    

 


Date:      , 20


 





	 	(Signature)
	 	 
	 	(Address)
	 	 
	 	(Tax Identification Number)



 


Signature Guaranteed:


 


THE SIGNATURE(S) SHOULD 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 (UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED).


 


[Signature Page to Election
to Purchase]