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Exhibit 4.3    
    

AMENDMENT NO. 1 TO

REGISTRATION RIGHTS AGREEMENT  

        THIS AMENDMENT NO. 1 TO REGISTRATION RIGHTS AGREEMENT (this "Amendment"), entered into as of August 8, 2006, among CLEAN
ENERGY FUELS CORP., formerly ENRG, Inc., a Delaware corporation (the "Company"), and the undersigned equity holders of capital stock of the Company. 

RECITALS:  

        A.    The
undersigned hold shares of the Company's common stock (the "Common Stock"). Certain of the undersigned (the "Existing
Registration Rights Holders") possess registration rights pursuant to the Registration Rights Agreement, dated as of December 31, 2002, among the Company, such holders and
certain other stockholders of the Company (the "Rights Agreement"). 

        B.    In
connection an initial public offering of the Company's Common Stock (the "IPO"), the Existing Registration Rights Holders have agreed to
grant registration rights to (i) certain stockholders who are employees or directors of the Company (the "Company Designees"), and (ii) certain stockholders
who purchased or otherwise received shares of the Company's Common Stock from Boone Pickens listed on Exhibit B (the "Pickens
Transferees"). 

        C.    The
Existing Registration Rights Holders desire to amend the Rights Agreement to (i) allow the Company Designees collectively to sell up to 650,000 shares of
Common Stock to be sold by selling stockholders in the initial closing of an IPO (the "Initial Offering") and (ii) allow such Pickens Transferees who sign the
Adoption Agreement attached hereto as Exhibit A to collectively sell in the over-allotment closing of the IPO (the
"Over-Allotment") a portion of the shares of Common Stock Boone Pickens transferred to them. 

        D.    The
number of shares stockholders may sell in the IPO as a result of this Amendment is set forth on Exhibit C. 

        E.    The
Existing Registration Rights Holders executing this Amendment hold sixty-six percent (66%) or more of the Registrable Shares (as defined in the Rights
Agreement) held by all Existing Registration Rights Holders and, therefore, have the power under Section 9 of the Rights Agreement to amend the Rights Agreement. 

        NOW,
THEREFORE, in consideration of the mutual promises and covenants set forth herein, the parties to the Rights Agreement hereby agree that the Rights Agreement will be amended as
follows: 

        1.     Adding
Parties to Rights Agreement.    The undersigned Existing Registration Rights Holders hereby agree that each of the Company
Designees who have signed this Amendment and such Pickens Transferees who sign the Adoption Agreement will be added as a "Holder" under the Rights Agreement and will be subject to such terms,
conditions, restrictions and obligations as set forth in the Rights Agreement; provided, however, that the Company Designees' and Pickens Transferees' rights will be limited as follows: 

        (a)   The
Company Designees and Pickens Transferees will have such rights, restrictions and obligations under the Rights Agreement only in connection with the Company's IPO
and the shares of Common Stock they may sell in the IPO. 

        (b)   The
Company Designees as a group will have the right to register and sell in the aggregate 650,000 shares of Common Stock being sold by all selling stockholders in the
Initial Offering with each Company Designee having the right to sell up to that number of shares set forth opposite his or her name on the Exhibit C, and such
shares will be deemed "Registrable 

1

 

Shares"
under the Rights Agreement. The Company Designees will have no right to sell any shares of Common Stock in the Over-Allotment. 

        (c)   Boone
Pickens (including family trusts and other entities controlled by him) will forgo the right to sell any shares in the Over-Allotment, and instead the
Pickens Transferees will have the right to sell in the Over-Allotment up to the number of shares set forth opposite their names on Exhibit C. Such
shares will be deemed "Registrable Shares" under the Rights Agreement. 

        (d)   The
Company Designees and Pickens Transferees will have no right to transfer or assign any rights under the Rights Agreement. 

        (e)   Upon
consummation of the IPO, the rights of the Company Designees and Pickens Transferees under the Rights Agreement, including the right to require the Company to
register Registrable Shares held by them, will automatically terminate and the Company Designees and Pickens Transferees will have no further rights under the Rights Agreement; provided, however, that
each Company Designee and Pickens Transferee will continue to be bound by such obligations and liabilities under the Rights Agreement in connection with their participation in the Company's IPO,
including, but not limited, to such Company Designee's and Pickens Transferee's indemnification obligations under Section 8 of the Rights Agreement. 

        (f)    If
the IPO is not consummated for any reason by December 31, 2006, then the Company Designees and Pickens Transferees rights and obligations under the Rights
Agreement will automatically terminate on that date, they will no longer be parties to the Rights Agreement and they will not have the right to sell any of their shares in a Company offering. 

        2.     Assumption
of Obligations    Each undersigned Company Designee by his or her signature to this Amendment, and each Other
Stockholder by such stockholder's signature to the Adoption Agreement, agrees to be bound by the terms, conditions, restrictions and obligations as a Holder under the Rights Agreement with the same
force and effect as if such Company Designee and Pickens Transferee were originally a party thereto, including, but not limited to the underwriting requirements set forth in Section 5 of the
Rights Agreement and the indemnification obligations set forth in Section 8 of the Rights Agreement. Each Company Designee and Pickens Transferee acknowledges, however, that their rights under
the Rights Agreement are subject to the restrictions and limitations set forth in Section 1 hereof. 

        3.     Resulting
Participation Rights in IPO.    Each Holder's rights to sell shares in the Initial Offering and the
Over-Allotment as a result of this Amendment are set forth on Exhibit C. If the number of shares the Holders may sell overall is cut back, each Holder
will be cut back pro rata, which means that of the total shares available to the Holders to sell in the Initial Offering or the Over-Allotment, each Holder will be able to sell a portion
equal to the Holder's relative percentage shown on Exhibit C. 

        4.     Termination
of Voting Proxy.    Boone Pickens agrees that the voting proxy he has under the Stock Purchase and Buy-Sell
Agreement, dated February 1, 2006, terminates with respect to all shares of Common Stock sold by the Company Designees and Pickens Transferees in the Offering, such that the shares sold by the
Company Designees and Pickens Transferees in the Offering will thereafter be free from any voting restrictions. 

        5.     Remainder
of Rights Agreement Unchanged.    Except as amended by this Amendment, the Rights Agreement will otherwise remain in full
force and effect. Any further amendment to the Rights Agreement or this Amendment will require the consent of the Existing Registration Rights Holders holding sixty-six percent (66%) or
more of the Registrable Shares per Section 9 of the Rights Agreement, and any such amendment will be binding on the Company Designees and Pickens Transferees. 

2

 

        6.     Governing
Law.    This Amendment will be governed by and construed under the laws of the State of Delaware, without regard to its
conflicts of laws provisions. 

        7.     Counterparts.    This
Amendment may be executed in two or more counterparts, each of which will be deemed an original, but all of
which together will constitute one and the same instrument. 

        IN
WITNESS WHEREOF, the undersigned Holders and the Company have executed this Amendment as of the day and year first above written. 

	 	 	CLEAN ENERGY FUELS CORP.,

a Delaware corporation
	

 	
 	

By	

/s/  ANDREW J. LITTLEFAIR      
 Andrew J. Littlefair

President and Chief Executive Officer

EXISTING REGISTRATION RIGHTS HOLDERS:  

	PERSEUS ENRG INVESTMENT, L.L.C	 	WESTPORT INNOVATIONS, INC.
	

By:	

/s/  KENNETH M. SOCHA      
	
 	

By:	

/s/  DAVID DEMERS      

	

Name:	

Kenneth M. Socha
	
 	

Name:	

David Demers

	

Title:	

Senior Managing Director
	
 	

Title:	

CEO

	

/s/  BOONE PICKENS      
Boone Pickens	
 	

/s/  ALAN P. BASHAM      
Alan P. Basham

3

 

COMPANY DESIGNEES:  

	 	 	/s/  PETER J. GRACE      
	
Andrew J. Littlefair	 	
Peter J. Grace
	

/s/  JAMES N. HARGER      
James N. Harger	
 	

/s/  DENNIS DING      
Dennis Ding
	

/s/  RICHARD R. WHEELER      
Richard R. Wheeler	
 	

/s/  BARBARA JOHNSON      
Barbara Johnson
	

/s/  MITCHELL W. PRATT      
Mitchell W. Pratt	
 	

/s/  CATHERINE WEAVER      
Catherine Weaver
	

/s/  WARREN MITCHELL      
Warren Mitchell	
 	

/s/  JOHN HERRINGTON      
John Herrington
	

/s/  JOSEPH B. POWERS      
Joseph B. Powers	
 	

 

4

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the Company, and the Amendment No. 1 to the agreement dated
August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights Agreement and Amendment No. 1, and agrees to be bound by
them in accordance with their terms. 

        EXECUTED
AND DATED August 7, 2006. 

	 	 	Boone Pickens

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  BOONE PICKENS      
 Authorized Signature
	

 	
 	

 
	 	 	
 Title, if applicable
	

 	
 	

Address:	

8117 Preston Road, Suite 260
	

 	
 	

 	

Dallas, TX 75225
	

 	
 	

Telephone	

214-265-4165
	

 	
 	

Facsimile	

214-750-9773
	

 	
 	

E-mail	

sgeymuller@bpcap.net

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the Company, and the Amendment No. 1 to the agreement dated
August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights Agreement and Amendment No. 1, and agrees to be bound by
them in accordance with their terms. 

        EXECUTED
AND DATED August 8, 2006. 

	 	 	James N. Harger

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  JAMES N. HARGER      
 Authorized Signature
	

 	
 	

Senior Vice President

Title, if applicable
	

 	
 	

Address:	

1420 6th Street
	

 	
 	

 	

Manhattan Beach, CA 90266
	

 	
 	

Telephone	

562-546-0306
	

 	
 	

Facsimile	

562-493-4532
	

 	
 	

E-mail	

jharger@cleanenergyfuels.com

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the
Company, and the Amendment No. 1 to the agreement dated August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights
Agreement and Amendment No. 1, and agrees to be bound by them in accordance with their terms. 

        EXECUTED
AND DATED August    , 2006. 

	 	 	Mitchell W. Pratt

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  MITCHELL W. PRATT      
 Authorized Signature
	

 	
 	

SVP

Title, if applicable
	

 	
 	

Address:	

2585 N. Fountain Arbor Dr.
	

 	
 	

 	

Orange, CA 92867
	

 	
 	

Telephone	

562-493-2804
	

 	
 	

Facsimile	

562-546-0097
	

 	
 	

E-mail	

mpratt@cleanenergyfuels.com

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the Company, and the Amendment No. 1 to the agreement dated
August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights Agreement and Amendment No. 1, and agrees to be bound by
them in accordance with their terms. 

        EXECUTED
AND DATED August 7, 2006. 

	 	 	Warren I. Mitchell

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  WARREN I. MITCHELL      
 Authorized Signature
	

 	
 	

Chairman of the Board

Title, if applicable
	

 	
 	

Address:	

16921 Bolero Lane
	

 	
 	

 	

Huntington Beach, CA 92649
	

 	
 	

Telephone	

714-846-8769
	

 	
 	

Facsimile	

714-846-9217
	

 	
 	

E-mail	

wmitchellrunner@socal.rr.com

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the Company, and the Amendment No. 1 to the agreement dated
August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights Agreement and Amendment No. 1, and agrees to be bound by
them in accordance with their terms. 

        EXECUTED
AND DATED August    , 2006. 

	 	 	J&L Herrington 2002 Family Trust

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  JOHN S. HERRINGTON      
 Authorized Signature
	

 	
 	

Trustee

Title, if applicable
	

 	
 	

Address:	

160 Alderwood Road
	

 	
 	

 	

Walnut Creek, CA 94598
	

 	
 	

Telephone	

925-939-8080
	

 	
 	

Facsimile	

925-933-6668
	

 	
 	

E-mail	

herr400@comcast.net

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the
Company, and the Amendment No. 1 to the agreement dated August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights
Agreement and Amendment No. 1, and agrees to be bound by them in accordance with their terms. 

        EXECUTED
AND DATED August 10, 2006. 

	 	 	Glen David Aasheim

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  GLEN DAVID AASHEIM      
 Authorized Signature
	

 	
 	

General Manager, Southwest Region

Title, if applicable
	

 	
 	

Address:	

3201 Amherst Ave.
	

 	
 	

 	

Dallas, TX 75225
	

 	
 	

Telephone	

214-890-1960
	

 	
 	

Facsimile	

214-572-6581
	

 	
 	

E-mail	

daasheim@cleanenergyfuels.com

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the Company, and the Amendment No. 1 to the agreement dated
August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights Agreement and Amendment No. 1, and agrees to be bound by
them in accordance with their terms. 

        EXECUTED
AND DATED August 7, 2006. 

	 	 	Ronald D. Bassett

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  RONALD D. BASSETT      
 Authorized Signature
	

 	
 	

 
	 	 	
 Title, if applicable
	

 	
 	

Address:	

P.O. Box 5355
	

 	
 	

 	

Granbury, TX 76049
	

 	
 	

Telephone	

817-326-4281
	

 	
 	

Facsimile	

214-750-9773
	

 	
 	

E-mail	

ronb@bpcap.net

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the Company, and the Amendment No. 1 to the agreement dated
August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights Agreement and Amendment No. 1, and agrees to be bound by
them in accordance with their terms. 

        EXECUTED
AND DATED August 7, 2006. 

	 	 	G. Michael Boswell, IRA Custodian

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  G. MICHAEL BOSWELL      
 Authorized Signature
	

 	
 	

 
	 	 	
 Title, if applicable
	

 	
 	

Address:	

8117 Preston Road, Suite 260 W
	

 	
 	

 	

Dallas, TX 75225
	

 	
 	

Telephone	

214-265-4161
	

 	
 	

Facsimile	

214-750-0216
	

 	
 	

E-mail	

mboswell@bpcap.net

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the Company, and the Amendment No. 1 to the agreement dated
August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights Agreement and Amendment No. 1, and agrees to be bound by
them in accordance with their terms. 

        EXECUTED
AND DATED August 7, 2006. 

	 	 	Brian Bradshaw

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  BRIAN BRADSHAW      
 Authorized Signature
	

 	
 	

 
	 	 	
 Title, if applicable
	

 	
 	

Address:	

8117 Preston Road, Suite 260
	

 	
 	

 	

Dallas, TX 75225
	

 	
 	

Telephone	

214-265-4172
	

 	
 	

Facsimile	

214-750-0216
	

 	
 	

E-mail	

bbradshaw@bpcap.net

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the
Company, and the Amendment No. 1 to the agreement dated August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights
Agreement and Amendment No. 1, and agrees to be bound by them in accordance with their terms. 

        EXECUTED
AND DATED August 7, 2006. 

	 	 	Drew A. Campbell

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  DREW A. CAMPBELL      
 Authorized Signature
	

 	
 	

 
	 	 	
 Title, if applicable
	

 	
 	

Address:	

8117 Preston Road, Suite 260
	

 	
 	

 	

Dallas, TX 75225
	

 	
 	

Telephone	

214-265-4165
	

 	
 	

Facsimile	

214-750-0216
	

 	
 	

E-mail	

scampbell@bpcap.net

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the Company, and the Amendment No. 1 to the agreement dated
August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights Agreement and Amendment No. 1, and agrees to be bound by
them in accordance with their terms. 

        EXECUTED
AND DATED August    , 2006. 

	 	 	Marti J. Carlin

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  MARTI J. CARLIN      
 Authorized Signature
	

 	
 	

 
	 	 	
 Title, if applicable
	

 	
 	

Address:	

8117 Preston Road, Suite 260
	

 	
 	

 	

Dallas, TX 75225
	

 	
 	

Telephone	

214-265-4165
	

 	
 	

Facsimile	

214-750-9773
	

 	
 	

E-mail	

scarlin@bpcap.net

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the Company, and the Amendment No. 1 to the agreement dated
August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights Agreement and Amendment No. 1, and agrees to be bound by
them in accordance with their terms. 

        EXECUTED
AND DATED August 7, 2006. 

	 	 	Denise Delile

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  DENISE DELILE      
 Authorized Signature
	

 	
 	

 
	 	 	
 Title, if applicable
	

 	
 	

Address:	

8117 Preston Road, Suite 260
	

 	
 	

 	

Dallas, TX 75225
	

 	
 	

Telephone	

214-265-4163
	

 	
 	

Facsimile	

214-750-0216
	

 	
 	

E-mail	

denised@bpcap.net

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the Company, and the Amendment No. 1 to the agreement dated
August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights Agreement and Amendment No. 1, and agrees to be bound by
them in accordance with their terms. 

        EXECUTED
AND DATED August 7, 2006. 

	 	 	Denis Ding

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  DENIS DING      
 Authorized Signature
	

 	
 	

Director of Engineering

Title, if applicable
	

 	
 	

Address:	

17885 Peach Dr.
	

 	
 	

 	

Riverside, CA 92503
	

 	
 	

Telephone	

951-359-3278
	

 	
 	

Facsimile	

951-359-5004
	

 	
 	

E-mail	

denisding@aol.com

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the
Company, and the Amendment No. 1 to the agreement dated August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights
Agreement and Amendment No. 1, and agrees to be bound by them in accordance with their terms. 

        EXECUTED
AND DATED August 7, 2006. 

	 	 	Sally Geymuller

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  SALLY GEYMULLER      
 Authorized Signature
	

 	
 	

 
	 	 	
 Title, if applicable
	

 	
 	

Address:	

8117 Preston Road, Suite 260
	

 	
 	

 	

Dallas, TX 75225
	

 	
 	

Telephone	

214-265-4165
	

 	
 	

Facsimile	

214-750-9773
	

 	
 	

E-mail	

sallyg@bpcap.net

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the Company, and the Amendment No. 1 to the agreement dated
August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights Agreement and Amendment No. 1, and agrees to be bound by
them in accordance with their terms. 

        EXECUTED
AND DATED August 8, 2006. 

	 	 	Garnet D. Glover

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  GARNET D. GLOVER      
 Authorized Signature
	

 	
 	

 
	 	 	
 Title, if applicable
	

 	
 	

Address:	

51 Whittmore St.
	

 	
 	

 	

Concord, MA 01742
	

 	
 	

Telephone	

978-371-9131
	

 	
 	

Facsimile	

978-318-9220
	

 	
 	

E-mail	

gglover@cleanenergyfuels.com

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the Company, and the Amendment No. 1 to the agreement dated
August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights Agreement and Amendment No. 1, and agrees to be bound by
them in accordance with their terms. 

        EXECUTED
AND DATED August 8, 2006. 

	 	 	Dick Grant

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  DICK GRANT      
 Authorized Signature
	

 	
 	

 
	 	 	
 Title, if applicable
	

 	
 	

Address:	

8117 Preston Road, Suite 260
	

 	
 	

 	

Dallas, TX 75225
	

 	
 	

Telephone	

214-265-4165
	

 	
 	

Facsimile	

214-750-0216
	

 	
 	

E-mail	

dickg@bpcap.net

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the Company, and the Amendment No. 1 to the agreement dated
August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights Agreement and Amendment No. 1, and agrees to be bound by
them in accordance with their terms. 

        EXECUTED
AND DATED August 8, 2006. 

	 	 	M&R Ventures LLC

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  J. MIKE HOLDER      
 Authorized Signature
	

 	
 	

 
	 	 	
 Title, if applicable
	

 	
 	

Address:	

1 Champions Place
	

 	
 	

 	

Stillwater
	

 	
 	

Telephone	

405-377-4289
	

 	
 	

Facsimile	

405-377-2443
	

 	
 	

E-mail	

mike.holder@okstate.edu

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the
Company, and the Amendment No. 1 to the agreement dated August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights
Agreement and Amendment No. 1, and agrees to be bound by them in accordance with their terms. 

        EXECUTED
AND DATED August 8, 2006. 

	 	 	Chad M. Lindholm

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  CHAD M. LINDHOLM      
 Authorized Signature
	

 	
 	

Regional Manager

Title, if applicable
	

 	
 	

Address:	

269 Campo Dr.
	

 	
 	

 	

Long Beach, Ca 90803
	

 	
 	

Telephone	

562-822-0923
	

 	
 	

Facsimile	

562-493-4532
	

 	
 	

E-mail	

clindholm@cleanenergyfuels.com

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the Company, and the Amendment No. 1 to the agreement dated
August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights Agreement and Amendment No. 1, and agrees to be bound by
them in accordance with their terms. 

        EXECUTED
AND DATED August 7, 2006. 

	 	 	Daivd W. Meaney

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  DAVID W. MEANEY      
 Authorized Signature
	

 	
 	

 
	 	 	
 Title, if applicable
	

 	
 	

Address:	

8117 Preston Road, Suite 260
	

 	
 	

 	

Dallas, TX 75225
	

 	
 	

Telephone	

214-615-3816
	

 	
 	

Facsimile	

 
	

 	
 	

E-mail	

dmeaney@bpcap.net

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the Company, and the Amendment No. 1 to the agreement dated
August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights Agreement and Amendment No. 1, and agrees to be bound by
them in accordance with their terms. 

        EXECUTED
AND DATED August 7, 2006. 

	 	 	Eric Oberg

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  ERIC OBERG      
 Authorized Signature
	

 	
 	

 
	 	 	
 Title, if applicable
	

 	
 	

Address:	

4427N. Hall
	

 	
 	

 	

Dallas, TX 75219
	

 	
 	

Telephone	

214-520-1507
	

 	
 	

Facsimile	

 
	

 	
 	

E-mail	

ericoberg@sbcglobal.net

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the Company, and the Amendment No. 1 to the agreement dated
August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights Agreement and Amendment No. 1, and agrees to be bound by
them in accordance with their terms. 

        EXECUTED
AND DATED August 7, 2006. 

	 	 	Stephen R. Perkins

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  STEPHEN R. PERKINS      
 Authorized Signature
	

 	
 	

 
	 	 	
 Title, if applicable
	

 	
 	

Address:	

8117 Preston Road, Suite 260
	

 	
 	

 	

Dallas, TX 75225
	

 	
 	

Telephone	

214-615-3821
	

 	
 	

Facsimile	

214-750-9773
	

 	
 	

E-mail	

sperkins@bpcap.net

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the Company, and the Amendment No. 1 to the agreement dated
August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights Agreement and Amendment No. 1, and agrees to be bound by
them in accordance with their terms. 

        EXECUTED
AND DATED August 7, 2006. 

	 	 	Madeleine Pickens

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  MADELEINE PICKENS      
 Authorized Signature
	

 	
 	

 
	 	 	
 Title, if applicable
	

 	
 	

Address:	

8117 Preston Road, Suite 260
	

 	
 	

 	

Dallas, TX 75225
	

 	
 	

Telephone	

214-265-4165
	

 	
 	

Facsimile	

214-750-9773
	

 	
 	

E-mail	

sgeymuller@bpcap.net

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the Company, and the Amendment No. 1 to the agreement dated
August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights Agreement and Amendment No. 1, and agrees to be bound by
them in accordance with their terms. 

        EXECUTED
AND DATED August 7, 2006. 

	 	 	Joseph B. Powers

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  JOSEPH B. POWERS      
 Authorized Signature
	

 	
 	

Assistant VP Operations

Title, if applicable
	

 	
 	

Address:	

9 Seville
	

 	
 	

 	

Irvine, CA 92620
	

 	
 	

Telephone	

562-546-0308
	

 	
 	

Facsimile	

 
	

 	
 	

E-mail	

bpowers@cleanenergyfuels.com

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the Company, and the Amendment No. 1 to the agreement dated
August 8, 2006 and attached to this
Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights Agreement and Amendment No. 1, and agrees to be bound by them in accordance with their terms. 

        EXECUTED
AND DATED August 7, 2006. 

	 	 	Bretta Price

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  BRETTA PRICE      
 Authorized Signature
	

 	
 	

 
	 	 	
 Title, if applicable
	

 	
 	

Address:	

8117 Preston Road, Suite 260
	

 	
 	

 	

Dallas, TX 75225
	

 	
 	

Telephone	

214-265-4165
	

 	
 	

Facsimile	

214-750-9773
	

 	
 	

E-mail	

bprice@bpcap.net

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the Company, and the Amendment No. 1 to the agreement dated
August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights Agreement and Amendment No. 1, and agrees to be bound by
them in accordance with their terms. 

        EXECUTED
AND DATED August    , 2006. 

	 	 	Mark J. Riley

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  MARK J. RILEY      
 Authorized Signature
	

 	
 	

 
	 	 	
 Title, if applicable
	

 	
 	

Address:	

114 School St.
	

 	
 	

 	

Concord, NH 03301
	

 	
 	

Telephone	

603-715-2963
	

 	
 	

Facsimile	

603-715-2796
	

 	
 	

E-mail	

markriley98@comcast.net

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the Company, and the Amendment No. 1 to the agreement dated
August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights Agreement and Amendment No. 1, and agrees to be bound by
them in accordance with their terms. 

        EXECUTED
AND DATED August 7, 2006. 

	 	 	Michael Ross

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  MICHAEL ROSS      
 Authorized Signature
	

 	
 	

 
	 	 	
 Title, if applicable
	

 	
 	

Address:	

8117 Preston Road, Suite 260
	

 	
 	

 	

Dallas, TX 75225
	

 	
 	

Telephone	

214-265-4171
	

 	
 	

Facsimile	

214-750-9773
	

 	
 	

E-mail	

mross@bpcap.net

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the Company, and the Amendment No. 1 to the agreement dated
August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights Agreement and Amendment No. 1, and agrees to be bound by
them in accordance with their terms. 

        EXECUTED
AND DATED August    , 2006. 

	 	 	Jack E. Rosser

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  JACK ROSSER      
 Authorized Signature
	

 	
 	

 
	 	 	
 Title, if applicable
	

 	
 	

Address:	

645 N. Brookfield
	

 	
 	

 	

Wichita, KS 67206
	

 	
 	

Telephone	

Telephone 316-687-0352
	

 	
 	

Facsimile	

 
	

 	
 	

E-mail	

jayrossere@cox.net

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the Company, and the Amendment No. 1 to the agreement dated
August 8, 2006 and attached to this
Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights Agreement and Amendment No. 1, and agrees to be bound by them in accordance with their terms. 

        EXECUTED
AND DATED August 7, 2006. 

	 	 	Robert L. Stillwell

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  ROBERT L. STILLWELL      
 Authorized Signature
	

 	
 	

 
	 	 	
 Title, if applicable
	

 	
 	

Address:	

8117 Preston Road, Suite 260
	

 	
 	

 	

Dallas, TX 75225
	

 	
 	

Telephone	

214-265-4165
	

 	
 	

Facsimile	

214-750-9773
	

 	
 	

E-mail	

roberts@bpcap.net

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the Company, and the Amendment No. 1 to the agreement dated
August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights Agreement and Amendment No. 1, and agrees to be bound by
them in accordance with their terms. 

        EXECUTED
AND DATED August 7, 2006. 

	 	 	Alekander Szewczyk

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  ALEKSANDER SZEWCZYK      
 Authorized Signature
	

 	
 	

 
	 	 	
 Title, if applicable
	

 	
 	

Address:	

8117 Preston Road, Suite 260
	

 	
 	

 	

Dallas, TX 75225
	

 	
 	

Telephone	

214-265-4165
	

 	
 	

Facsimile	

 
	

 	
 	

E-mail	

alex@bpcap.net

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the Company, and the Amendment No. 1 to the agreement dated
August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights Agreement and Amendment No. 1, and agrees to be bound by
them in accordance with their terms. 

        EXECUTED
AND DATED August 7, 2006. 

	 	 	Danny Tillett

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  DANNY TILLETT      
 Authorized Signature
	

 	
 	

 
	 	 	
 Title, if applicable
	

 	
 	

Address:	

8117 Preston Road, Suite 260
	

 	
 	

 	

Dallas, TX 75225
	

 	
 	

Telephone	

214-265-4165
	

 	
 	

Facsimile	

 
	

 	
 	

E-mail	

dtillett@bpcap.net

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the Company, and the Amendment No. 1 to the agreement dated
August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights Agreement and Amendment No. 1, and agrees to be bound by
them in accordance with their terms. 

        EXECUTED
AND DATED August 8, 2006. 

	 	 	Jon N. Whisler

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  JON N. WHISLER      
 Authorized Signature
	

 	
 	

 
	 	 	
 Title, if applicable
	

 	
 	

Address:	

32243 Skylakes Dr.
	

 	
 	

 	

Waller, TX 77484
	

 	
 	

Telephone	

214-908-9429
	

 	
 	

Facsimile	

 
	

 	
 	

E-mail	

jwhisler@bpcap.net

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the Company, and the Amendment No. 1 to the agreement dated
August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights Agreement and Amendment No. 1, and agrees to be bound by
them in accordance with their terms. 

        EXECUTED
AND DATED August 8, 2006. 

	 	 	John Plewes

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  JOHN PLEWES      
 Authorized Signature
	

 	
 	

 
	 	 	
 Title, if applicable
	

 	
 	

Address:	

P.O. Box 675751
	

 	
 	

 	

Rancho Santa Fe, CA 92067
	

 	
 	

Telephone	

858-735-8300
	

 	
 	

Facsimile	

 
	

 	
 	

E-mail	

john@plewesgroup.com

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the Company, and the Amendment No. 1 to the agreement dated
August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights Agreement and Amendment No. 1, and agrees to be bound by
them in accordance with their terms. 

        EXECUTED
AND DATED August 8, 2006. 

	 	 	Dominique Plewes

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  DOMINIQUE PLEWES      
 Authorized Signature
	

 	
 	

 
	 	 	
 Title, if applicable
	

 	
 	

Address:	

P.O. Box 675751
	

 	
 	

 	

Rancho Santa Fe, CA 92067
	

 	
 	

Telephone	

858-735-8300
	

 	
 	

Facsimile	

 
	

 	
 	

E-mail	

dominique@plewes.com

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the Company, and the Amendment No. 1 to the agreement dated
August 8, 2006 and attached to this
Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights Agreement and Amendment No. 1, and agrees to be bound by them in accordance with their terms. 

        EXECUTED
AND DATED August 7, 2006. 

	 	 	Deborah Stovall

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  DEBORAH STOVALL      
 Authorized Signature
	

 	
 	

 
	 	 	
 Title, if applicable
	

 	
 	

Address:	

6618 Regalbluff Dr.
	

 	
 	

 	

Dallas, TX 75248
	

 	
 	

Telephone	

214-207-4501
	

 	
 	

Facsimile	

 
	

 	
 	

E-mail	

dstoval@yahoo.com

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the Company, and the Amendment No. 1 to the agreement dated
August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights Agreement and Amendment No. 1, and agrees to be bound by
them in accordance with their terms. 

        EXECUTED
AND DATED August 7, 2006. 

	 	 	Pamela Pickens-Zeller

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  PAMELA PICKENS-ZELLER      
 Authorized Signature
	

 	
 	

 
	 	 	
 Title, if applicable
	

 	
 	

Address:	

16447 S. 4th Street
	

 	
 	

 	

Phoenix, AZ 85048
	

 	
 	

Telephone	

480-460-4024
	

 	
 	

Facsimile	

 
	

 	
 	

E-mail	

ppz@cox.net

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the Company, and the Amendment No. 1 to the agreement dated
August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights Agreement and Amendment No. 1, and agrees to be bound by
them in accordance with their terms. 

        EXECUTED
AND DATED August 7, 2006. 

	 	 	Elizabeth Pickens Cordia

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  ELIZABETH PICKENS CORDIA      
 Authorized Signature
	

 	
 	

 
	 	 	
 Title, if applicable
	

 	
 	

Address:	

904 Vicar Lane
	

 	
 	

 	

Alexandria, VA 22302
	

 	
 	

Telephone	

703-212-7850
	

 	
 	

Facsimile	

703-212-6751
	

 	
 	

E-mail	

epcordia@yahoo.com

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the Company, and the Amendment No. 1 to the agreement dated
August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights Agreement and Amendment No. 1, and agrees to be bound by
them in accordance with their terms. 

        EXECUTED
AND DATED August 9, 2006. 

	 	 	Eugene Frenkel

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  EUGENE FRENKEL      
 Authorized Signature
	

 	
 	

 
	 	 	
 Title, if applicable
	

 	
 	

Address:	

4028 Shady Hill Dr.
	

 	
 	

 	

Dallas, TX 75229
	

 	
 	

Telephone	

214-648-4180
	

 	
 	

Facsimile	

214-648-1955
	

 	
 	

E-mail	

eugene.frenkel@utsouthwestern.com

EXHIBIT A  

ADOPTION AGREEMENT 

(for
Pickens Transferees) 

        This
Adoption Agreement ("Adoption Agreement") is executed by the undersigned transferee of stock of Clean Energy Fuels Corp. (the "Company"). The undersigned agrees that the undersigned
is being granted certain registration rights to sell shares of Company stock received from Mr. Pickens in the Company's IPO and that these rights are subject to the terms and conditions of the
Registration Rights Agreement, dated as of December 31, 2002, among the Company, and certain other stockholders of the
Company, and the Amendment No. 1 to the agreement dated August 8, 2006 and attached to this Adoption Agreement. The undersigned acknowledges receipt of a copy of the Registration Rights
Agreement and Amendment No. 1, and agrees to be bound by them in accordance with their terms. 

        EXECUTED
AND DATED August 7, 2006. 

	 	 	Christine Penrod

Print name of stockholder as it appears on certificate
	

 	
 	

/s/  CHRISTINE PENROD      
 Authorized Signature
	

 	
 	

 
	 	 	
 Title, if applicable
	

 	
 	

Address:	

2683 Via De La Valle, #G407
	

 	
 	

 	

Del Mar, CA 92014
	

 	
 	

Telephone	

858-759-5500 x238
	

 	
 	

Facsimile	

858-756-7836
	

 	
 	

E-mail	

 

Exhibit B

Pickens Transferees 

Brian
Bradshaw

Alex Szewczyk

Michael Ross

David Meaney

Danny Tillett

Dick Grant

Sandy Campbell

Jay Rosser

Eric Oberg

Sally Geymuller

Ron Bassett

Bobby Stillwell

Madeleine Pickens

M&R (Coach Holder)

Michael Boswell

Dave Aasheim

Chad Lindholm

Cheryl Glover

Mark Riley

Denis Ding

Andrew Littlefair

Brian Powers

James Hargar

Mitch Pratt

Warren Mitchell

John Herrington

John Whisler

Marti Carlin

Denise Dellle

Steve Perkins

Bretta Price

John Plewes

Dominique Plewes

Deborah Stovall

Pam Pickens

Liz Cordia

Boone Pickens Interests Ltd.

Eugene Frenkel

Christine Penrod 

Exhibit C 

Allocation of Selling Stockholder 

Shares
in IPO 

(Attached) 

QuickLinks

Exhibit 4.3QuickLinks
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Exhibit 10.1    
    

 
 

ENRG, INC.
  2002 STOCK OPTION PLAN  
    

        1.    Purpose of the Plan.    The purpose
of this ENRG, Inc. 2002 Stock Option Plan is to offer certain Employees, Non-Employee Directors, and Consultants the opportunity to acquire a proprietary interest in the Company by
the grant of options to purchase Common Stock. Through the Plan, the Company and its subsidiaries seek to attract, motivate, and retain highly competent persons. The success of the Company and its
affiliates are dependent upon the efforts of these persons. An Option granted under the Plan may be a Non-Statutory Stock Option or an Incentive Stock Option, as determined by the
Administrator. 

        2.    Definitions.    As used herein, the
following definitions shall apply. 

        "Act"
shall mean the Securities Act of 1933, as amended. 

        "Administrator"
shall mean the Board or any one of the Committees. 

        "Affiliate"
shall mean any parent or subsidiary (as defined in Sections 424(e) and (f) of the Code) of the Company. 

        "APB
25" shall mean Opinion 25 of the Accounting Principles Board, as amended, and any successor thereof. 

        "Board"
shall mean the Board of Directors of the Company 

        "Cause"
shall have the meaning given to it under Delaware law, as interpreted by the Administrator. 

        "Change
in Control" shall mean: (i) the acquisition by any entity, person, or group (other than the Company, any one of its Affiliates, or an employee benefit plan maintained by
the Company or any one of its Affiliates) of beneficial ownership of 50% or more of the outstanding voting stock of the Company; (ii) the occurrence of a transaction requiring shareholder
approval for the acquisition of the Company by the purchase of stock or assets, or by merger, or otherwise; or (iii) the election during any period of 24 months or less of 50% or more of
the members of the Board without the approval of the nomination of such members by a majority of the Board consisting of members who were serving at the beginning of such period. 

        "Code"
shall mean the Internal Revenue Code of 1986, as amended. 

        "Committee"
shall mean a committee appointed by the Board in accordance with Section 3 below. 

        "Common
Stock" shall mean the common stock of the Company, .0001 par value. 

        "Company"
shall mean ENRG, Inc., a Delaware corporation. 

        "Consultant"
shall mean any natural person who performs bona fide services for the Company or an Affiliate as a consultant or advisor, excluding Employees and Non-Employee
Directors; provided, however, that such services must not be in connection with the offer or sale of securities in a capital raising transaction, and such person does not directly or indirectly
promote or maintain a market for the Company's securities. 

        "Date
of Exercise" shall mean the date on which the Company shall have received written notice of the Option exercise accompanied by the Exercise Price. 

        "Date
of Grant" shall mean the effective date on which the Administrator grants an Option to an Optionee. 

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        "Disability"
shall mean total and permanent disability as defined in Section 22(e)(3) of the Code. 

        "Employee"
shall mean any individual who is a common-law employee of the Company or an Affiliate. 

        "Exchange
Act" shall mean the Securities Exchange Act of 1934, as amended. 

        "Exercise
Price" shall mean the exercise price of a share of Optioned Stock. 

        "Fair
Market Value" shall mean, as of any date, the value of Common Stock determined as follows: 

        (i)    If
the Common Stock is listed on any established stock exchange or a national market system, including without limitation, the Nasdaq National Market or The Nasdaq
SmallCap Market of The Nasdaq Stock Market, its Fair Market Value shall be the closing sales price for such stock (or the closing bid, if no sales were reported) as quoted on such exchange or system
for the last market trading day prior to the time of determination, as reported in The Wall Street Journal or such other source as the Administrator
deems reliable; 

        (ii)   If
the Common Stock is regularly quoted by a recognized securities dealer but selling prices are not reported, its Fair Market Value shall be the mean between the high
bid and low asked prices for the Common Stock quoted by such recognized securities dealer on the last market trading day prior to the day of determination; or 

        (iii)  In
the absence of an established market for the Common Stock, its Fair Market Value shall be determined, in good faith, by the Administrator. 

For
purposes of (iii) above, the Administrator may, but is not required to, engage an outside valuation firm to help it determine the Fair Market Value of a Share, and such firm may use such
valuation method(s) as are standard in its profession to value non-public companies. 

        "FASB"
shall mean the Financial Accounting Standards Board. 

        "Incentive
Stock Option" shall mean an Option intended to qualify as an incentive stock option within the meaning of Section 422 of the Code. 

        "Mature
Shares" shall mean Shares that had been held by the Optionee for a meaningful period of time such as six months or such other period of time that is consistent with FASB's
interpretation of APB 25. 

        "Non-Employee
Director" shall mean a non-employee member of the Board. 

        "Non-Statutory
Stock Option" shall mean an Option not intended to qualify as an Incentive Stock Option. 

        "Option"
shall mean a stock option granted pursuant to the Plan. 

        "Option
Agreement" shall mean a written agreement that evidences an Option in such form as the Administrator shall approve from time to time. 

        "Optioned
Stock" shall mean the Common Stock subject to an Option. 

        "Optionee"
shall mean any person who receives an Option. 

        "Person"
shall be construed broadly and shall include, without limitation, an individual, a partnership, an investment fund, a limited liability company, a corporation, an association, a
joint stock company, a trust, a joint venture, an unincorporated organization, and a governmental entity or any department, agency or political subdivision thereof. 

        "Plan"
shall mean the ENRG, Inc. 2002 Stock Option Plan. 

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        "Qualified
Note" shall mean a recourse note, with a market rate of interest, that may, at the discretion of the Administrator, be secured by the Optioned Stock or otherwise. 

        "Rule 16b-3"
shall mean Rule 16b-3 promulgated under the Exchange Act or any successor to Rule 16b-3. 

        "Section 280G
Approval" shall mean the stockholder approval obtained in compliance with the requirements of Code Section 280G(b)(5)(B), as amended, and any successor
thereof, and the regulations or proposed regulations promulgated thereunder, as determined by the Administrator in its sole discretion. 

        "Service"
shall mean the performance of services for the Company (or any Affiliate) by an Employee, Non-Employee Director, or Consultant, as determined by the Administrator
in its sole discretion. Service shall not be considered interrupted in the case of: (i) a change of status (i.e., from Employee to Consultant,
Non-Employee Director to Consultant, or any other combination); (ii) transfers between locations of the Company or between the Company and any Affiliate; or (iii) a leave of
absence approved by the Company or an Affiliate. A leave of absence approved by the Company or an Affiliate shall include sick leave, military leave, or any other personal leave approved by an
authorized representative of the Company or an Affiliate. 

        "Service
Provider" shall mean an Employee, Non-Employee Director, or Consultant. 

        "Share"
shall mean a share of Common Stock. 

        "Taxes"
shall mean the federal, state, and local income and employment tax liabilities incurred by the Optionee in connection with his/her Options. 

        "10%
Shareholder" shall mean the owner of stock (as determined under Section 424(d) of the Code) possessing more than 10% of the total combined voting power of all classes of
stock of the Company (or any Affiliate). 

        "Termination
Date" shall mean the date on which an Optionee's Service terminates, as determined by the Administrator in its sole discretion. 

        3.    Administration of the Plan.    

        (a)   Initial
Plan Administration. Prior to the date, if any, upon which the Company becomes subject to the Exchange Act, the Plan shall be
administered by the Board or a committee appointed by the Board. 

        (b)   Plan
Procedure after the Date, if any, upon Which the Company becomes Subject to the Exchange Act. 

        (i)    Multiple
Administrative Bodies. The Plan may be administered by different Committees with respect to different groups of Service Providers. 

        (ii)   Section
162(m). To the extent that the Administrator determines that it is desirable to qualify Options as "performance-based compensation"
within the meaning of Section 162(m) of the Code, the Plan shall be administered by a Committee of two or more "outside directors" within the meaning of Section 162(m) of the Code. 

        (iii)  Rule
16b-3. To the extent desirable to qualify transactions hereunder as exempt under Rule 16b-3, the
transactions contemplated hereunder shall be structured to satisfy the requirements for exemption under Rule 16b-3. 

        (iv)  Other
Administration. Other than as provided for above, the Plan shall be administered by (A) the Board or (B) a Committee,
which Committee shall be constituted to satisfy applicable laws. 

3

 

        (c)   Powers
of the Administrator. Subject to the provisions of the Plan and in the case of specific duties delegated by the Administrator, and
subject to the approval of relevant authorities, including the approval, if required, of any stock exchange or national market system upon which the Common Stock is then listed, the Administrator
shall have the authority, in its sole discretion: 

        (i)    to
determine the Fair Market Value of the Common Stock; 

        (ii)   to
select the Service Providers to whom Options may, from time to time, be granted under the Plan; 

        (iii)  to
determine whether and to what extent Options are granted under the Plan; 

        (iv)  to
determine the number of Shares that are covered by an Option; 

        (v)   to
approve the terms of the Option Agreements; 

        (vi)  to
determine the terms and conditions, not inconsistent with the terms of the Plan, of any Option. Such terms and conditions may include, but are not limited to, the
Exercise Price, the status of an Option (Non-Statutory Stock Option or Incentive Stock Option), the time or times when the Option may be exercised, any vesting acceleration or waiver of
forfeiture restrictions, and any restriction or limitation regarding the Option or the Shares relating thereto, based in each case on such factors as the Administrator, in its sole discretion, shall
determine; 

        (vii) to
determine the method of payment of the Exercise Price; 

        (viii) to
reduce the Exercise Price of any Option to the then current Fair Market Value if the Fair Market Value of the Optioned Stock has declined since the Date of Grant
of such Option; 

        (ix)  to
delegate to others responsibilities to assist in administering the Plan; and 

        (x)   to
construe and interpret the terms of the Plan, Option Agreements, and any other documents related to the Options. 

        (d)   Effect
of Administrator's Decision. All decisions, determinations, and interpretations of the Administrator shall be final and binding on
all Optionees and any other holders of any Options. The Administrator's decisions and determinations under the Plan need not be uniform and may be made selectively among Optionees whether or not such
Optionees are similarly situated. 

        (e)   Liability.
No member of the Committee shall be personally liable by reason of any contract or other instrument executed by such member or on
his/her behalf in his/her capacity as a member of the Committee for any mistake of judgment made in good faith, and the Company shall indemnify and hold harmless each member of the Committee and each
other employee, officer or director of the Company to whom any duty or power relating to the administration or interpretation of the Plan may be allocated or delegated, against any cost or expense
(including counsel fees) or liability (including any sum paid in settlement of a claim) arising out of any act or omission to act in connection with the Plan unless arising out of such person's own
fraud or bad faith. The foregoing right of indemnification shall not be exclusive of any other rights of indemnification to which such persons may be entitled under the Company's Articles of
Incorporation or Bylaws, as a matter of law, or otherwise, or any power the Company may have to indemnify them or hold them harmless. 

        4.    Stock Subject To The Plan.    

        (a)   Basic
Limitation. The total number of Shares subject to issuance under the Plan may not exceed 1,200,000 subject to adjustments as provided
for in the Plan. Shares to be delivered under the Plan may consist, in whole or in part, of authorized but unissued Shares, or Shares purchased by the Company on the open market or by private
purchase. 

        (b)   Additional
Shares. In the event that any outstanding Option expires or is canceled or otherwise terminated, the Shares allocable to the
unexercised portion of such Option shall again be 

4

 

available
for the purposes of the Plan. In the event that Shares issued under the Plan are reacquired by the Company at their original purchase price, such Shares shall again be available for the
purposes of the Plan, except that the aggregate number of Shares which may be issued upon the exercise of Incentive Stock Options shall in no event exceed 1,200,000 Shares, subject to adjustment,
pursuant to Section 8 below. 

        5.    Eligibility.    The persons
eligible to participate in the Plan shall be limited to Employees, Non-Employee Directors, and Consultants who have the potential to impact the long-term success of the Company
and/or its Affiliates and who have been selected by the Administrator to participate in the Plan; provided, however, Employees and Non-Employee Directors of a parent of the Company are not
eligible to participate in the Plan. 

        6.    Option Terms.    Each Option shall
be evidenced by an Option Agreement, in the form approved by the Administrator and may contain such provisions as the Administrator deems appropriate; provided, however, that each Option Agreement
shall comply with the terms specified below. Each Option Agreement evidencing an Incentive Stock Option shall, in addition, be subject to Section 7 below. 

        (a)   Exercise
Price. 

        (i)    The
Exercise Price of an Option shall be determined by the Administrator but shall not be less than 100% (110% in the case of a person who owns, on the Date of Grant of
such Option, stock possessing more than 10% of the total combined voting power of all classes of stock of the Company or any affiliate) of the Fair Market Value of a Share on the Date of Grant of such
Option. 

        (ii)   The
consideration to be paid for the Shares to be issued upon exercise of an Option, including the method of payment, shall be determined by the Administrator and may
consist entirely of (A) cash, (B) check, (C) Mature Shares, (D) Qualified Note, or (E) any combination of the foregoing methods of payment. 

        (b)   Vesting.
Any Option granted hereunder shall be exercisable and shall vest at such times and under such conditions as determined by the
Administrator and set forth in the Option Agreement, but in the case of an Optionee who is not an officer of the Company, a Non-Employee Director, or a Consultant, an Option or Shares
purchased thereunder shall vest at a rate of at least 20% per year. An Option may not be exercised for a fraction of a Share. 

        (c)   Term
of Options. No Option shall have a term in excess of 10 years measured from the Date of Grant of such Option. 

        (d)   Procedure
for Exercise. An Option shall be deemed to be exercised when written notice of such exercise has been given to the Company in
accordance with the terms of the Option Agreement by the person entitled to exercise the Option and full payment of the applicable Exercise Price for the Share being exercised has been received by the
Administrator. Full payment may, as authorized by the Administrator, consist of any consideration and method of payment allowable under Subsection (a)(ii) above. 

        (e)   Effect
of Termination of Service. 

        (i)    Termination
of Service. Upon termination of an Optionee's Service, other than due to death, Disability, or Cause, the Optionee may exercise
his/her Option, but only on or prior to the date that is 30 days following the Optionee's Termination Date, and only to the extent that the Optionee was entitled to exercise such Option on the
Termination Date (but in no event later than the expiration of the term of such Option, as set forth in the Notice of Stock Option Grant to the Option Agreement). If, on the Termination Date, the
Optionee is not entitled to exercise the Optionee's entire Option, the Shares covered by the unexercisable portion of the Option shall 

5

 

revert
to the Plan. If, after termination of Service, the Optionee does not exercise his/her Option within the time specified herein, the Option shall terminate, and the Optioned Stock shall revert to
the Plan. 

        (ii)   Disability
of Optionee. In the event of termination of an Optionee's Service due to hisker Disability, the Optionee may exercise hisker
Option, but only on or prior to the date that is twelve months following the Termination Date, and only to the extent that the Optionee was entitled to exercise such Option on the Termination Date
(but in no event later than the expiration date of the term of his/her Option, as set forth in the Notice of Stock Option Grant to the Option Agreement). To the extent the Optionee is not entitled to
exercise the Option on the Termination Date, or if the Optionee does not exercise the Option to the extent so entitled within the time specified herein, the Option shall terminate, and the Optioned
Stock shall revert to the Plan. 

        (iii)  Death
of Optionee. In the event that an Optionee should die while in Service, the Optionee's Option may be exercised by the Optionee's
estate or by a person who has acquired the right to exercise the Option by bequest or inheritance, but only on or prior to the date that is twelve months following the date of death, and only to the
extent that the Optionee was entitled to exercise the Option at the date of death (but in no event later than the expiration date of the term of his/her Option, as set forth in the Notice of Stock
Option Grant to the Option Agreement). If, at the time of death, the Optionee was not entitled to exercise hisker entire Option, the Shares covered by the unexercisable portion of the Option shall
immediately revert to the Plan. If after death, the Optionee's estate or a person who acquires the right to exercise the Option by bequest or inheritance does not exercise the Option within the time
specified herein, the Option shall terminate, and the Optioned Stock shall revert to the Plan. 

        (iv)  Cause.
In the event of termination of an Optionee's Service due to Cause, the Optionee's Options shall terminate on the Termination Date. 

        (v)   The
Administrator shall have complete discretion, exercisable either at the time an Option is granted or at any lime while the Option remains outstanding, to: 

        (A)  extend
the period of time for which the Option is to remain exercisable following the Optionee's cessation of Service from the limited exercise period otherwise in
effect for that Option to such greater
period of time as the Administrator shall deem appropriate, but in no event beyond the expiration of the Option term; and/or 

        (B)  permit
the Option to be exercised, during the applicable post-Service exercise period, not only with respect to the number of vested Shares for which such
Option is exercisable at the time of the Optionee's cessation of Service but also with respect to one or more additional installments in which the Optionee would have vested bad the Optionee continued
in Service. 

        (f)    Shareholder
Rights. Until the issuance (as evidenced by the appropriate entry on the books of the Company or of a duly authorized transfer
agent of the Company) of the stock certificate evidencing such Shares, no right to vote or receive dividends or any other rights as a shareholder shall exist with respect to the Optioned Stock,
notwithstanding the exercise of the Option. The Company shall issue (or cause to be issued) such certificate promptly upon exercise of the Option. No adjustment will be made for a dividend or other
right for which the record date is prior to the date the stock certificate is issued, except as provided in Section 8 below. 

        (g)   Repurchase
Rights. Shares purchased upon exercise of an Option shall be subject to such Company repurchase rights as the Administrator shall
deem appropriate. These repurchase rights shall be set forth in the Option Agreement and the Stock Restriction Agreement attached to the Option Agreement, and shall comply with the terms specified
below. If the Company has a right to repurchase the Optioned Stock upon termination of the Optionee's Service, then the Company shall repurchase such Shares (if at all) at: (i) their Fair
Market Value on the Optionee's Termination Date; or (ii) their 

6

 

original
Exercise Price (provided that the right to repurchase the Shares of an Optionee (who is not an officer of the Company, a Non-Employer Director, or a Consultant) at their original
Exercise Price lapses at the rate of at least 20% of the Shares per year from the Date of Grant of the Option). The Company must exercise such repurchase right, if at all, within 90 days after
the Optionee's Termination Date (or in the case of Shares issued upon exercise of an Option after the Termination Date, within 90 days after the date of exercise) for cash or for cancellation
of indebtedness incurred in purchasing the Shares. The right to repurchase the Shares at their Fair Market Value shall terminate when the Common Stock becomes publicly traded. 

        (h)   Non-transferability
of Options. Options may not be sold, pledged, assigned, hypothecated, transferred, or disposed of in any
manner other- than by will or by the laws of descent and distribution and may be exercised, during the lifetime of the Optionee, only by the Optionee. 

        7.    Incentive Stock Options.    The
terms specified below shall be applicable to all Incentive Stock Options, and these terms shall, as to such Incentive Stock Options, supercede any conflicting terms in Section 6 above. Options
which are specifically designated as Non-Statutory Stock Options when issued under the Plan shall not be subject to the terms of this Section. 

        (a)   Eligibility.
Incentive Stock Options may only be granted to Employees. 

        (b)   Exercise
Price. The Exercise Price of an Incentive Stock Option shall not be less than 100% of the Fair Market Value of a Share on the Date
of Grant of such Option, except as otherwise provided in Section 7(d) below. 

        (c)   Dollar
Limitation. In the case of an Incentive Stock Option, the aggregate Fair Market Value of the Optioned Stock (determined as of the
Date of Grant of each Option) with respect to Options granted to any Employee under the Plan (or any other option plan of the Company or any Affiliate) that may for the first time become exercisable
as Incentive Stock Options during any one calendar year shall not exceed the sum of $100,000. To the extent the Employee holds two or more such Options which become exercisable for the first time in
the same calendar year, the foregoing limitation on the exercisability of such Options as Incentive Stock Options shall be applied on the basis of the order in which such Options are granted. Any
Options in excess of such limitation shall automatically be treated as Non-Statutory Stock Options. 

        (d)   10%
Shareholder. If any Employee to whom an Incentive Stock Option is granted is a 10% Shareholder, then the Exercise Price shall not be
less than 110% of the Fair Market Value of a Share on the Date of Grant of such Option, and the Option term shall not exceed five years measured from the Date of Grant of such Option. 

        (e)   Change
in Status. In the event of an Optionee's change of status from Employee to Consultant or to Non-Employee Director, an
Incentive Stock Option held by the Optionee shall cease to be treated as an Incentive Stock Option and shall be treated for tax purposes as a Non-Statutory Stock Option three months and
one day following such change of status. 

        (f)    Approved
Leave of Absence. If an Optionee is on an approved leave of absence, and the Optionee's reemployment upon expiration of such leave
is not guaranteed by statute or contract, including Company policies, then on the 91st day of such leave any Incentive Stock Option held by the Optionee shall cease to be treated as an Incentive Stock
Option and shall be treated for tax purposes as a Non-Statutory Stock Option. 

        8.    Adjustments Upon Changes in
Capitalization.    

        (a)   Changes
in Capitalization. The number of Shares covered by each outstanding Option, and the number of Shares which have been authorized for
which no Options have yet been granted or which have been returned to the Plan upon cancellation or expiration of an Option, as well as the Exercise Price per Share covered by each such outstanding
Option, shall be proportionately adjusted 

7

 

for
any increase or decrease in the number of issued and outstanding Shares resulting from a stock split, reverse stock split, stock dividend, recapitalization, combination or reclassification of the
Common Stock, or any other increase or decrease in the number of issued and outstanding Shares, effected without the receipt of consideration by the Company. Such adjustment shall be made by the
Administrator so that the adjustment shall not result in an accounting consequence under APB 25 and FASB Interpretation No. 44, as amended, and any successor thereof. The Administrator's
determination with respect to the adjustment shall be final, binding, and conclusive. 

        (b)   Dissolution
or Liquidation. In the event of the proposed dissolution or liquidation of the Company, the Administrator shall notify each
Optionee as soon as practicable prior to the effective date of such proposed transaction. In such event, the Administrator, in its discretion, may provide for an Optionee to fully vest in his/her
Option. In addition, the Administrator may provide that any Company repurchase option applicable to any Shares purchased upon exercise of an Option shall lapse as to all such Shares. To the extent it
has not been previously exercised, an Option will terminate upon termination or liquidation of the Company. 

        9.    Chance in Control.    

        (a)   Except
as otherwise provided for in the Optionee's Option Agreement, in the event of a Change in Control, the Company and the successor corporation, if any, may agree
(without the Optionee's consent): 

        (i)    that,
subject to Subsection (b) below, all Options that are outstanding on the date that immediately precedes the date of the Change in Control shall become
exercisable on the date that immediately precedes the date of the Change in Control and the Administrator shall notify the Optionees of their Options' exercisability at least 21 days prior to
the date of the Change in Control so that the Optionees can decide whether or not to exercise their Options on the date that invnediately precedes the date of the Change in Control. Effective as of
the date of the Change in Control, the Plan shall terminate and all unexercised Options shall be cancelled; 

        (ii)   to
terminate the Plan and cancel all outstanding Options effective as of the date of the Change in Control without the payment of any consideration; provided, however,
that the Company shall notify the Optionees of their Options' cancellation at least 21 days prior to the date of the Change in Control so that the Optionees can exercise those Options that are
otherwise exercisable before they are cancelled; 

        (iii)  that
the successor corporation or its parent shall assume the Plan and all outstanding Options effective as of the date of the Change in Control; 

        (iv)  to
terminate the Plan and cancel all outstanding Options effective as of the date of the Change in Control and replace such Options with comparable options in the
successor corporation or parent thereof (the determination of comparability shall be made by the Administrator, and its determination shall be final, binding, and conclusive); 

        (v)   to
terminate the Plan and cancel all outstanding Options effective as of the date of the Change in Control and, subject to Subsection (b) below, deliver to the
Optionee in lieu thereof the difference between the Fair Market Value of a Share on the date of the Change in Control and the Exercise Price of the Optionee's Option, multiplied by the number of
Shares to which the Option relates; or 

        (vi)  to
terminate the Plan and cancel all outstanding Options effective as of the date of the Change in Control and deliver to the Optionee in lieu thereof the difference
between the Fair Market Value of a Share on the date of the Change in Control and the Exercise Price of the Optionee's Option, multiplied by the number of vested Shares that the Optionee would have
received had he/she exercised the Option. For purposes of this Subsection, an Optionee shall be 

8

 

deemed
to be vested in a Share if such Share is not subject to the Company's right to repurchase at its Exercise Price. 

        (b)   Notwithstanding
the foregoing, unless Section 280G Approval has been obtained, no acceleration of exercisability or payment shall occur under Subsection
(a) above to the extent that such acceleration or payment would, after taking into account any other payments in the nature of compensation to which the Optionee would have a right to receive
from the Company and any other Person contingent upon the occurrence of such Change in Control, result in a "parachute payment" as defined in Section 280G(b)(2) of the Code. 

        (c)   The
outstanding Options shall in no way affect the right of the Company to adjust, reclassify, reorganize or otherwise change its capital or business structure or to
merge, consolidate, dissolve, liquidate or sell or transfer all or any part of its business or assets. 

        10.    Cancellation and Regrant of
Options.    The Administrator shall have the authority to effect, at any time and from time to time, with the consent of the affected Optionee, the
cancellation of any or all outstanding Options and to grant in substitution new Options covering the same or a different number
of Shares but with an Exercise Price per Share based on the Fair Market Value per Share on the new Date of Grant of the Option. 

        11.    Share Escrow/Legends.    Unvested
Shares issued under the Plan may, in the Administrator's discretion, be held in escrow by the Company until the Optionee's interest in such Shares vests or may be issued directly to the Optionee with
restrictive legends on the certificates evidencing those unvested Shares. 

        12.    Tax Withholding.    

        (a)   The
Company's obligation to deliver Shares upon the exercise of Options or vesting of such Shares under the Plan shall be subject to the satisfaction of all applicable
federal, state and local income and employment tax withholding requirements. 

        (b)   The
Administrator may, in its discretion, provide any or all holders of Non-Statutory Stock Options or unvested Shares under the Plan with the right to use
previously vested Shares in satisfaction of all or part of the Taxes incurred by such holders in connection with the exercise of their Options or the vesting of their Shares; provided, however, that
this form of payment shall be limited to the withholding amount calculated using the minimum statutory rates. Such right may be provided to any such holder in either or both of the following formats: 

        (i)    Stock
Withholding: The election to have the Company withhold, from the Shares otherwise issuable upon the exercise of such
Non-Statutory Stock Option or the vesting of such Shares, a portion of those Shares with an aggregate Fair Market Value equal to the Taxes calculated using the minimum statutory rates. 

        (ii)   Stock
Delivery: The election to deliver to the Company, at the time the Non-Statutory Stock Option is exercised or the Shares
vest, one or more Shares previously acquired by such holder (other than in connection with the Option exercise or Share vesting triggering the Taxes) with an aggregate Fair Market Value equal to the
Taxes calculated using the minimum statutory rates. 

        13.    Effective Date and Term of the
Plan.    The Plan shall become effective as of December 12,2002, the date of its adoption by the Board, subject to ratification by the
shareholders of the Company within 12 months of the adoption date. Unless sooner terminated by the Administrator, the Plan shall continue until the day prior to the tenth anniversary of the
date on which the Board adopted the Plan or the date on which the shareholders of the Company approved the Plan, which ever is earlier. When the Plan terminates, no Options shall be granted under the
Plan thereafter. The 

9

 

termination
of the Plan shall not affect any Shares previously issued or any Option previously granted under the Plan. 

        14.    Time of Granting; Options.    The
Date of Grant of an Option shall, for all purposes, be the date on which the Administrator makes the determination to grant such Option, or such other date as determined by the Administrator. Notice
of the determination shall be given to each Service Provider to whom an Option is so granted within a reasonable period of time after the date of such grant. 

        15.    Amendment and Termination of the
Plan.    

        (a)   Amendment
and Termination. The Board may at any time amend, alter, suspend, or discontinue the Plan, but no amendment, alteration,
suspension, or discontinuation shall be made which would impair the rights of any Optionee under any grant theretofore made without his/her consent. In addition, to the extent necessary and desirable
to comply with Section 422 of the Code (or any other applicable law or regulation, including the requirements of any stock exchange or national market system upon which the Common Stock is then
listed), the Company shall obtain shareholder approval of any Plan amendment in such a manner and to such a degree as required. 

        (b)   Effect
of Amendment and Termination. Any such amendment or termination of the Plan shall not affect Options already granted, and such
Options shall remain in full force and effect as if this Plan had not been amended or terminated, unless mutually agreed otherwise between the Optionee and the Board, which agreement must be in
writing and signed by the Optionee and the Company. 

        16.    Regulatory Approvals.    

        (a)   The
implementation of the Plan, the granting of any Option and the issuance of any Shares upon the exercise of any granted Option shall be subject to the Company's
procurement of all approvals and permits required by regulatory authorities having jurisdiction over the Plan, the Options granted under it, and the Shares issued pursuant to it. 

        (b)   No
Shares or other assets shall be issued or delivered under the Plan unless and until there shall have been compliance with all applicable requirements of federal and
state securities laws, including the filing and effectiveness of the Form S-8 registration statement (if required) for the Shares issuable under the Plan, and all applicable listing
requirements of any stock exchange (or the Nasdaq National Market, if applicable) on which Common Stock is then listed for trading (if any). 

        17.    No Employment/Service
Rights.    Nothing in the Plan shall confer upon the Optionee any right to continue in Service for any period of specific duration or interfere with or
otherwise restrict in any way the rights of the Company (or any Affiliate employing or retaining such person) or of the Optionee, which rights are hereby expressly reserved by each, to tenninate such
person's Service at any time for any reason, with or without cause. 

        18.    Shareholder Approval.    The Plan
shall be subject to approval by the shareholders of the Company within 12 months before or after the date the Plan is adopted by the Board. Such shareholder approval shall be obtained in the
degree and manner required under applicable state and federal law and the rules of any stock exchange or national market system upon which the Common Stock is then listed or traded. 

        19.    Financial Reports.    The Company
shall deliver to the Optionees and the shareholders who have received Shares under the Plan a balance sheet and an income statement at least annually, unless such individual is a key Employee whose
duties in connection with the Company (or any Affiliate) assure such individual access to equivalent information. 

        20.    Market
Stand-Off.    In connection with any underwritten public offering by the Company of its equity securities pursuant to an effective
registration statement filed under the Act, including the Company's initial public offering, the Optionee shall not directly or indirectly sell, make any short sale of, loan, hypothecate, pledge,
offer, grant or sell any option or other contract for the purchase of, 

10

 

purchase
any option or other contract for the sale of, or otherwise dispose of or transfer, or agree to engage in any of the foregoing transactions with respect to, any Shares acquired under this Plan
without the prior written consent of the Company or its underwriters. Such restriction (the "Market Stand-Off') shall be in effect for such period of time following the date of the final prospectus
for the offering as may be requested by the Company or such underwriters. In no event, however, shall such period exceed 180 days. In the event of the declaration of a stock dividend, a
spin-off, a stock split, an adjustment in conversion ratio, a recapitalization or a similar transaction affecting the Company's outstanding securities without receipt of consideration, any
new, substituted or additional securities which are by reason of such transaction distributed with respect to any Shares subject to the Market Stand-Off, or into which such Shares thereby
become convertible, shall immediately be subject to the Market Stand-Off. In order to enforce the Market Stand-Off, the Company may impose stop-transfer
instructions with respect to the Shares acquired under this Plan until the end of the applicable stand-off period. The Company's underwriters shall be beneficiaries of the agreement set
forth in this Section. This Section shall not apply to Shares registered in the public offering under the Act, and the Optionee shall be subject to this Section only if the directors and officers of
the Company are subject to similar an-agreements. 

        21.    Stock Restriction
Agreement.    Notwithstanding any other provision of this Plan, the Administrator may condition the initial exercise of an Option upon the Optionee
and, if applicable, his/her spouse, entering into a Stock Restriction Agreement. The certificates evidencing the Shares issued to the Optionee pursuant to this Plan shall bear the legend required by
the Stock Restriction Agreement. This provision may be waived by the Company in writing and shall terminate when the Common Stock becomes publicly traded. 

        22.    Governing Law.    This Plan shall
be governed by Delaware law, applied without regard to conflict of law principles. 

        IN
WITNESS WHEREOF, the Company, by its duly authorized officer, has executed this Plan effective as of December 12, 2002. 

	 	 	ENRG, INC.
	

 	
 	

By:	
 	

/s/ Andrew Littlefair

	

 	
 	

Its:	
 	

/s/ Andrew Littlefair

11

 
 

AMENDMENT NO. 1
  TO THE
  ENRG, INC. 2002 STOCK OPTION PLAN    

        Clean
Energy Fuels Corp (the "Company") hereby amends the above-named plan (the "Plan"), as follows: 

        1.     Effective
as of May 5, 2003, the name "ENRG, Inc." is replaced with "Clean Energy Fuels Corp" every time that it is used in the Plan. 

        2.     Effective
as of June 11th, 2003, the number 1,200,000 in Subsections 4(a) and (b) of the Plan is replaced with 1,750,000 shares. 

*
* * * * 

        The
Company has caused this Amendment No. 1 to be signed on the date indicated below, to be effective as indicated above. 

	 	 	"Company"
	

 	
 	

CLEAN ENERGY FUELS CORP
	

Dated: June 16, 2003	
 	

By:	
 	

/s/ Michael W. Pratt

	

 	
 	

Its:	
 	

Michael W. Pratt

 
 

AMENDMENT NO. 2
  TO THE
  CLEAN ENERGY FUELS CORP.
  2002 STOCK OPTION PLAN    
    

        Clean Energy Fuels Corp. (the "Company") hereby amends the above-named plan (the "Plan"), as follows: 

        Effective
as of May 6, 2005, the number 1,750,000 in Subsections 4(a) and (b) of the Plan is replaced with 2,750,000. 

*
* * * * 

        The
Company has caused this Amendment No. 2 to be signed on the date indicated below, to be effective as indicated above. 

	Dated: May 6, 2005	 	"Company"
	

 	
 	

CLEAN ENERGY FUELS CORP.
	

 	
 	

By:	
 	

/s/  MITCHELL W. PRATT      

	

 	
 	

Its:	
 	

Corporate Secretary

 
 

AMENDMENT NO. 3
  TO THE
  CLEAN ENERGY FUELS CORP.
  2002 STOCK OPTION PLAN    
    

        Clean Energy Fuels Corp. (the "Company") hereby amends the above-named plan (the "Plan"), as follows: 

        Effective
as of May 17, 2005, the number 2,750,000 in Subsections 4(a) and (b) of the Plan is replaced with 4,250,000. 

*
* * * * 

        The
Company has caused this Amendment No. 3 to be signed on the date indicated below, to be effective as indicated above. 

	Dated:            , 2005	 	"Company"
	

 	
 	

CLEAN ENERGY FUELS CORP.
	

 	
 	

By:	
 	

    

	

 	
 	

Its:	
 	

    

 
 

Stock Option No.    
    

 
 

CLEAN ENERGY FUELS CORP.
  2002 STOCK OPTION PLAN
  NOTICE OF STOCK OPTION GRANT  
    

        You have been granted the following option to purchase common stock of Clean Energy Fuels Corp. (the "Company"): 

	Name of Optionee:	 	 
	

Total Number of Shares Granted:

("Optioned Stock")	
 	

 
	

Type of Option:	
 	

o    Incentive Stock Option

o    Non-Statutory Stock Option
	

Exercise Price Per Share:	
 	

$
	

Date of Grant:	
 	

 
	

Date Exercisable:	
 	

This option may be exercised with respect to [the first      % of the Optioned Stock shall vest when the Optionee completes 12 months of continuous Service after the Vesting Commencement Date. An
additional      % of the Optioned Stock shall vest when the Optionee completes each 12 months of continuous Service thereafter. Notwithstanding the foregoing, 100% of the Optioned Stock shall vest upon a Change in
Control; provided, that a Termination Date had not occurred prior to such Change in Control.]
	

Vesting Commencement Date:	
 	

 
	

Expiration Date:	
 	

 

        By
your signature and the signature of the Company's representative below, you and the Company agree that this option is granted under and governed by the terms and conditions of the
Clean Energy Fuels Corp. 2002 Stock Option Plan and the Stock Option Agreement, both of which are attached to and made a part of this document. 

	OPTIONEE:	 	CLEAN ENERGY FUELS CORP.
	

          
	
 	

By:	
 	

          

	

          
 Print Name	
 	

Title:	
 	

          

	

          
 Social Security Number	
 	

 	
 	

 

 
 

AMENDMENT NO. 4
  TO THE
  CLEAN ENERGY FUELS CORP. 2002 STOCK OPTION PLAN    
    

        Clean Energy Fuels Corp. (the "Company") hereby amends the above-named plan (the "Plan"), as follows: 

        1.     Effective
as of August 10, 2006, the number 4,250,000 in Subsections 4(a) and (b) of the Plan is replaced with 5,750,000. 

        2.     Effective
immediately, the definition of "Mature Shares" in Section 2 of the Plan is deleted. 

        3.     Effective
immediately, Subsection 6(a)(ii) of the Plan is amended to read as follows: 

"(ii)
The consideration to be paid for the Shares to be issued upon exercise of an Option, including the method of payment, shall be determined by the Administrator and may consist entirely of
(A) cash, (B) check, (C) previously acquired Shares, (D) Qualified Note, (E) the Company's retention of Shares otherwise issuable upon exercise of a
Non-Statutory Stock Option, or (F) any combination of the foregoing methods of payment." 

*
* * * * 

        The
Company has caused this Amendment No. 4 to be signed on the date indicated below, to be effective as indicated above. 

	Dated: August 29, 2006	 	"Company"
	

 	
 	

CLEAN ENERGY FUELS CORP.
	

 	
 	

By:	
 	

/s/  MITCHELL PRATT      

	

 	
 	

Its:	
 	

S.V.P., Secretary

   CLEAN ENERGY FUELS CORP.

2002 STOCK OPTION PLAN
  STOCK OPTION AGREEMENT  

        1.    Definitions.    Unless
otherwise defined herein, the terms defined in the Clean Energy Fuels Corp. 2002 Stock Option Plan (the
"Plan") shall have the same defined meanings in this Stock Option Agreement. 

        2.    Grant
of Option.    Pursuant to the terms and conditions set forth in the Notice of Stock Option Grant attached hereto and this
Agreement, Clean Energy Fuels Corp. (the "Company") grants to the optionee named in the Notice of Stock Option Grant ("Optionee") on the date of grant set forth in the Notice of Stock Option Grant
("Date of Grant") the option to purchase, at the exercise price set forth in the Notice of Stock Option Grant ("Exercise Price"), the number of Shares set forth in the Notice of Stock Option Grant.
This option is intended to be an Incentive Stock Option or a Non-Statutory Stock Option, as provided in the Notice of Stock Option Grant. 

        3.    Exercise
of Option.    Subject to the other conditions set forth in this Agreement, all or part of this option may be exercised
prior to its expiration at the time or times set forth in the Notice of Stock Option Grant; provided, however, the Optionee shall cease vesting in this option on the Optionee's Termination Date. If a
Change in Control occurs while the Optionee is in Service, then this option shall be exercisable in accordance with Section 9 of the Plan. 

        4.    Expiration
of Option.    Subject to the provisions of Section 5 hereof, this option shall expire and all rights to purchase
Shares hereunder shall cease on the date set forth in the Notice of Stock Option Grant ("Expiration Date"). 

        5.    Termination
of Option.    In the event that the Optionee's Service terminates for any reason other than due to a Disability, death,
or Cause, this option shall expire on the date that is 30 days following the Optionee's Termination Date, unless this option would expire pursuant to Section 4 at an earlier date in
which case this option will expire on the earlier Expiration Date. In the event that the Optionee's Service terminates due to a Disability, this option shall expire on the date that is twelve months
following the Optionee's Termination Date, unless this option would expire pursuant to Section 4 at an earlier date in which case this option will expire on the earlier Expiration Date. In the
event that the Optionee should die while in Service, this option shall expire on the date that is twelve months after
the Optionee's death, unless this option would expire pursuant to Section 4 at an earlier date in which case this option will expire on the earlier Expiration Date. In the event that the
Optionee's Service terminates for Cause, this option shall terminate on the Termination Date. 

        6.    Non-transferability
of Option.    This option shall be non-transferable by the Optionee other than by will
or by the laws of descent and distribution, and shall be exercisable during the lifetime of the Optionee only by the Optionee, or as to Non-Statutory Stock Options also, by the Optionee's
guardian or legal representative. After the death of the Optionee, this option may be exercised prior to its termination by the Optionee's legal representative, heir or legatee, to the extent
permitted in the Plan. Upon any attempt to sell, transfer, assign, pledge, hypothecate or otherwise dispose of this option (a "Transfer"), or of any right or privilege conferred hereby, contrary to
the provisions hereof, or upon any attempted sale under any execution, attachment or similar process upon the rights and privileges conferred hereby, this option and the rights and privileges
conferred hereby shall immediately become null and void. Until written notice of any permitted passage of rights under this option shall have been given to and received by the Secretary of the
Company, the Company may, for all purposes, regard the Optionee as the holder of this option. 

        7.    Method
of Exercise.    The rights granted under this Agreement may be exercised by the Optionee, or by the person or persons to
whom the Optionee's rights under this Agreement shall have passed under the provisions of Section 6 hereof, by delivering to the Company in care of its Secretary 

1

 

at
the Company's principal office, written notice of the number of Shares with respect to which the rights are being exercised, accompanied by this Agreement for appropriate endorsement by the
Company, such investment letter as may be required by Section 14 hereof, executed Stock Restriction Agreement described in Section 8 below, payment of the exercise price, and such other
representations and agreements as may be required by the Administrator. The exercise price may be paid in any one of the forms or combination of forms provided for in Section 6(a) of the Plan,
at the Administrator's election. 

        8.    Stock
Restriction Agreement.    Notwithstanding any other provision of this Agreement to the contrary, the initial exercise of this
option shall be conditioned upon the execution and delivery by the Optionee and, if applicable, his/her spouse, of a Stock Restriction Agreement (in the form attached hereto as Exhibit A). The
Optionee acknowledges that the certificates evidencing the Shares issued to the Optionee hereunder shall bear the legend required by the Stock Restriction Agreement. This provision may be waived by
the Company in writing and shall terminate when the Common Stock becomes publicly traded. 

        9.    Regulatory
Compliance.    The issue and sale of Common Stock pursuant to this Agreement shall be subject to full compliance with
all then applicable requirements of law and the requirements of any stock exchange or interdealer quotation system upon which the Common Stock may be listed or traded. 

        10.    Legends.    The
certificates evidencing the Common Stock issued upon exercise of this option, if any, shall bear the following
legend, if applicable, at the time of exercise: 

THE
SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR UNDER THE APPLICABLE SECURITIES LAWS OF ANY STATE AND MAY BE OFFERED AND SOLD
ONLY IF REGISTERED PURSUANT TO THE PROVISIONS OF SUCH ACT OR SUCH LAWS OR IF AN EXEMPTION FROM REGISTRATION IS AVAILABLE." 

        11.    Modification
and Termination.    The rights of the Optionee are subject to modification and termination in certain events, as
provided in the Plan. 

        12.    Withholding
Tax.    As a condition to the exercise of this option, the Optionee shall make such arrangements as the Administrator
may require for the satisfaction of any federal, state, local, or foreign withholding tax obligations that may arise in connection with such exercise. The Optionee shall also make such arrangements as
the Administrator may require for the satisfaction of any federal, state, local, or foreign withholding tax obligations that may arise in connection with the disposition of Shares acquired by
exercising this option. The Optionee will pay to the Company an amount equal to the withholding amount (or the Company may withhold such amount from the Optionee's salary) in cash. At the
Administrator's election, the Optionee may pay the withholding amount with Shares (including previously vested Optioned Stock); provided, however, that payment in Stock shall be limited to the
withholding amount calculated using the minimum statutory rates. 

        13.    Holder
of Shares.    Neither the Optionee nor the Optionee's legal representative, legatee or distributee shall be, or be deemed
to be, a holder of any Shares subject to this option unless and until such person has been issued a certificate or certificates therefor. No adjustment will be made for dividends or other rights for
which the record date is prior to the date such stock certificate or certificates are so issued. 

        14.    Investment
Covenant.    The Optionee represents and agrees that if the Optionee exercises this option in whole or in part at a
time when there is not in effect under the Act, a registration statement relating to the Shares issuable upon exercise hereof and there is not available for delivery a prospectus meeting the
requirements of Section 10(a)(3) of such Act, (i) the Optionee will acquire the Shares upon such exercise for the purpose of investment and not with a view to the distribution 

2

 

thereof,
(ii) if requested by the Company, upon such exercise of this option, the Optionee will furnish to the Company an investment letter in form acceptable to it, (iii) if requested
by the Company, prior to selling or offering for sale any such Shares, the Optionee will furnish the Company with an opinion of counsel satisfactory to it to the effect that such sale may lawfully be
made and will furnish it with such certificates as to factual matters as it may reasonably request, and (iv) certificates representing such shares may be marked with an appropriate legend
describing such conditions precedent to sale or transfer. Any person or persons entitled to exercise this option under the provision of Section 6 hereof shall furnish to the Company letters,
opinions, and certificates to the same effect as would otherwise be required of the Optionee. 

        15.    Nondisclosure.    Optionee
acknowledges that the grant and terms of this option are confidential and may not be disclosed by
Optionee to any other person, including other employees of the Company and other participants in the Plan, without the express written consent of the Company's President. Notwithstanding the
foregoing, the Optionee may disclose the grant and terms of this option to the Optionee's family member, financial advisor, and attorney. Any breach of this provision will be deemed to be a material
breach of this Agreement. 

        16.    Governing
Law.    This Agreement shall be governed by and interpreted in accordance with the internal laws of the State of
Delaware. 

        17.    Successors.    This
Agreement shall inure to the benefit of and be binding upon the parties hereto and their legal
representatives, heirs, and permitted successors and assigns. 

        18.    Plan.    This
Agreement is subject to all of the terms and provisions of the Plan, receipt of a copy of which is hereby
acknowledged by the Optionee. The Optionee further acknowledges receipt of a copy of the Stock Restriction Agreement. The Optionee hereby agrees to accept as binding, conclusive, and final all
decisions and interpretations of the Administrator upon any questions arising under the Plan, this Agreement, and Notice of Stock Option Grant. 

        19.    Rights
to Future Employment.    This option does not confer upon the Optionee any right to continue in the Service of the Company
or any Affiliate, nor does it limit the right of the Company to terminate the Service of the Optionee at any time. 

        20.    Market
Stand-Off.    In connection with any underwritten public offering by the Company of its equity securities
pursuant to an effective registration statement filed under the Act, including the Company's initial public offering, the Optionee shall not directly or indirectly sell, make any short sale of, loan,
hypothecate, pledge, offer, grant or sell any option or other contract for the purchase of, purchase any option or other contract for the sale of, or otherwise dispose of or transfer, or agree to
engage in any of the foregoing transactions with respect to, any Shares acquired under this Agreement without the prior written consent of the Company or its underwriters. Such restriction (the
"Market Stand-Off") shall be in effect for such period of time following the date of the final prospectus for the offering as may be requested by the Company or such underwriters. In no
event, however, shall such period exceed 180 days. In the event of the declaration of a stock dividend, a spin-off, a stock split, an adjustment in conversion ratio, a
recapitalization or a similar transaction affecting the Company's outstanding securities without receipt of consideration, any new, substituted or additional securities which are by reason of such
transaction distributed with respect to any Shares subject to the Market Stand-Off, or into which such Shares thereby become convertible, shall immediately be subject to the Market
Stand-Off. In order to enforce the Market Stand-Off, the Company may impose stop-transfer instructions with respect to the Shares acquired under this Agreement
until the end of the applicable stand-off period. The Company's underwriters shall be beneficiaries of the agreement set forth in this Section. This Section shall not apply to Shares
registered in the public offering under the Act, and the Optionee shall be subject to this Section only if the directors and officers of the Company are subject to similar arrangements. 

3

 

        21.    Entire
Agreement.    The Notice of Stock Option Grant, this Agreement, the Plan, and the Stock Restriction Agreement constitute
the entire contract between the parties hereto with regard to the subject matter hereof. They supersede any other agreements, representations or understandings (whether oral or written and whether
express or implied) which relate to the subject matter hereof. 

4

QuickLinks

Exhibit 10.1

ENRG, INC. 2002 STOCK OPTION PLAN

AMENDMENT NO. 1 TO THE ENRG, INC. 2002 STOCK OPTION PLAN

AMENDMENT NO. 2 TO THE CLEAN ENERGY FUELS CORP. 2002 STOCK OPTION PLAN

AMENDMENT NO. 3 TO THE CLEAN ENERGY FUELS CORP. 2002 STOCK OPTION PLAN

Stock Option No.

CLEAN ENERGY FUELS CORP. 2002 STOCK OPTION PLAN NOTICE OF STOCK OPTION GRANT

AMENDMENT NO. 4 TO THE CLEAN ENERGY FUELS CORP. 2002 STOCK OPTION PLAN

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