FORM 4
[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public
Utility Holding Company Act of 1935 or Section 30(f) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

SPERRY MARK A 		2. Issuer Name and Ticker or Trading Symbol

PLUG POWER INC [ PLUG ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                      _____ 10% Owner
__ X __ Officer (give title below)      _____ Other (specify below)
VP & GM Continuous Power Div
(Last)          (First)          (Middle)

968 ALBANY SHAKER ROAD 		3. Date of Earliest Transaction (MM/DD/YYYY)

5/12/2009
(Street)

LATHAM, NY 12110
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8) 		4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4) 		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Plug Power Common Stock   5/12/2009     A    8505   (1) A $0   70374   D    
Plug Power Common Stock   5/12/2009     F    2947   (2) D $0.91   67427   D    

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. Code
(Instr. 8) 		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4) 		8. Price of Derivative Security
(Instr. 5) 		9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Option to Purchase Common Stock   $0.95   5/20/2009     A     2500   (3)        (4) 5/20/2019   Common Stock   2500   $0   189527   D    

Explanation of Responses:
( 1)  Stock grant pursuant to the Plug Power 2009 Stock Option and Incentive Plan and the Executive Incentive Plan as adopted by the Board of Directors on February 15, 2007 and as amended by the Board of Directors on July 30, 2008.
( 2)  Sale of shares to satisfy income tax withholding obligation.
( 3)  Awarded pursuant to Plug Power's 2009 Founder's Grant and Long-Term Incentive Plan.
( 4)  The stock options vest as follows: 834 shares become exercisable on May 20, 2010; 833 shares become exercisable on May 20, 2011; 833 shares become exercisable on May 20, 2012.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
SPERRY MARK A
968 ALBANY SHAKER ROAD
LATHAM, NY 12110

VP & GM Continuous Power Div

Signatures
/s/ Gerard L. Conway, Jr., Attorney in Fact 5/22/2009
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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