FORM 3
        
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF 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(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Corless Adrian J

2. Date of Event Requiring Statement (MM/DD/YYYY)
2/9/2010 

3. Issuer Name and Ticker or Trading Symbol

PLUG POWER INC [PLUG]

(Last)        (First)        (Middle)

968 ALBANY SHAKER ROAD

4. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                            _____ 10% Owner
___ X ___ Officer (give title below)          _____ Other (specify below)
Chief Technology Officer /

(Street)

LATHAM, NY 12110       

(City)              (State)              (Zip)
5. 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 Beneficially Owned
1.Title of Security
(Instr. 4)
2. Amount of Securities Beneficially Owned
(Instr. 4)
3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)
4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Plug Power Common Stock   83729   D    

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 4)
2. Date Exercisable and Expiration Date
(MM/DD/YYYY)
3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)
4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)
6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Options to Purchase Common Stock   4/4/2007   4/4/2017   Plug Power Common Stock   30000   (1) $3.24   D    
Options to Purchase Common Stock   7/30/2008   7/30/2018   Plug Power Common Stock   27000   (2) $2.42   D    
Options to Purchase Common Stock   5/20/2010   5/20/2019   Plug Power Common Stock   2500   (3) $0.95   D    

Explanation of Responses:
( 1)  These stock options were fully vested as of December 2008.
( 2)  These stock options were fully vested as of December 2008.
( 3)  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
Corless Adrian J
968 ALBANY SHAKER ROAD
LATHAM, NY 12110


Chief Technology Officer

Signatures
/s/ Gerard L. Conway, Jr., Attorney in Fact 2/25/2010
** 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 5(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.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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