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 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(h) of the Investment Company Act of 1940

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(Print or Type Responses)

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 (Month/Day/Year) 05/12/2009 (Street) LATHAM, NY 12110 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction 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 05/12/2009   A   8,505 (1) A $ 0 70,374 D   Plug Power Common Stock 05/12/2009   F   2,947 (2) D $ 0.91 67,427 D

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction 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 (Month/Day/Year)

7. Title and Amount of Underlying Securities (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

05/20/2009

A

2,500 (3)

(4)

05/20/2019

Common Stock

2,500

$ 0

189,527

D

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		05/22/2009
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(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.

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