PLUG Plug Power Inc

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
Under the Securities Exchange Act of 1934
(Amendment No. ____)

with a copy to:

Austin W. Marxe Allen B. Levithan, Esq.
527 Madison Avenue, Suite 2600 Lowenstein Sandler PC
New York, New York 10022 65 Livingston Avenue
 Roseland, New Jersey 07068
 (973) 597-2406

(Name, Address and Telephone Number of Person
Authorized to Receive Notices and Communications)

December 31, 2011
(Date of Event which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this
Schedule is filed:

____ Rule 13d-1(b)
_x__ Rule 13d-1(c)
____ Rule 13d-1(d)

*The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.
The information required on the remainder of this cover page shall not be deemed
to be ?filed? for the purpose of Section 18 of the Securities Exchange Act of 1934 (?Act?) or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the Notes).

Cusip No. 72919P202 13G Page 2 of 6 Pages
1.Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only):

Austin W. Marxe and David M. Greenhouse

2. Check the Appropriate Box if a Member of a Group (See Instructions):
(a) [ ] Not Applicable
(b) [ ]

3. SEC Use Only

4. Source of Funds (See Instructions): 00

2,120,000 Common Shares
 Owned by
 Each Reporting 9. Sole Dispositive Power: 0
 Person With 10. Shared Dispositive Power: 2,060,000

Common Shares1 and Warrants2 to purchase 2,120,000 Common Shares

11. Aggregate Amount Beneficially Owned by Each Reporting Person:
2,060,000 Common Shares1 and Warrants2 to purchase 2,120,000 Common Shares
12. Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions): Not Applicable

13. Percent of Class Represented by Amount in Row (11): 9.1%1

14. Type of Reporting Person (See Instructions): IA, IN

1 This is a joint filing by Austin W. Marxe (?Marxe?) and David M. Greenhouse (?Greenhouse?). Marxe and Greenhouse share sole voting and investment power over 407,110 shares of Common Stock and 419,145 Warrants2 to purchase common shares owned by Special Situations Private Equity Fund, L.P., 225,380 shares of Common Stock and 231,239 Warrants2 to purchase common shares owned by Special Situations Technology Fund, L.P. and 1,427,510 shares of Common Stock and 1,469,616 Warrants2 to purchase common shares owned by Special Situations Technology Fund II, L.P. See Items 2 and 4 of this Schedule for additional information.

2 The warrants describe herein may be exercised to the extent that the total number of shares of Common Stock then beneficially owned does not exceed 4.99%. The percentages of ownership reported in row 13 and item 4, do not reflect such warrants.

Page 3 of 6 Pages

Item 1. Security and Issuer:
(a) PlugPower, Inc.
(b) 968 Albany Sharer Road, Lathamm NY 12110

Item 2. (a) Name of Person Filing:
The persons filing this report are Austin W. Marxe (?Marxe?) and David M. Greenhouse (?Greenhouse?), who are the controlling principals of AWM Investment Company, Inc. (?AWM?). Marxe and Greenhouse are members of MG Advisers L.L.C. (?MG?), the general partner of Special Situations Private Equity Fund, L.P. (?SSPE?), and members of SST Advisers, L.L.C. (?SSTA?), the general partner of Special Situations Technology Fund, L.P. (?Technology?) and Special Situations Technology Fund II, L.P. (?Tech II?). AWM serves as investment adviser to SSPE, Technology and Tech II. (SSPE, Technology and Tech II will hereafter be referred to as, the ?Funds?). The principal business of each Fund is to invest in equity and equity-related securities and other securities of any kind or nature.

(b) Address of Principal Business Office or, if none, Residence:

The principal business address for Marxe and Greenhouse is 527 Madison Avenue, Suite 2600, New York, NY 10022.

(c) Citizenship:

Austin W. Marxe and David M. Greenhouse are United States citizens.

(d) Title of Class of Securities: Common Stock (e) CUSIP Number: 72919P202.

Item 3. If this statement is filed pursuant to $240.13d-1(b) or 240.13d-
2(b), check whether the person filing is a: Not Applicable

(a) ( ) Broker or Dealer registered under section 15 of the Act;
(b) ( ) Bank as defined in section 3(a) (6) of the Act;
(c) ( ) Insurance Company as defined in section 3(a) (19) of the Act;
(d) ( ) Investment Company registered under section 8 of the Investment Company Act of 1940;
(e) ( ) An Investment Adviser in accordance with $240.13d -1(b)(I)(ii)(E);
(f) ( ) An employee benefit plan or endowment fund in accordance with $240.13d-1(b)(I)(ii)(F);

Page 4 of 6 Pages

(g) ( ) A parent holding company or control person in accordance with $240.13d-
1(b)(1)(ii)(G);
(h) ( ) A savings association as defined in Section 3(b) of the Federal Deposit Insurance

Act;
(i) ( ) A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940;
(j) ( ) Group, in accordance with $240.13d-1(b)(1)(ii)(J).

Item 4. Ownership:

(a) Amount Beneficially Owned: Messrs. Marxe and Greenhouse beneficially own a total of 2,060,000 shares of Common Stock and 2,120,000 Warrants2 to purchase Common Shares. This amount includes 407,110 shares of Common Stock and 419,145 Warrants2 to purchase Common Shares owned by SSPE, 225,380 shares of Common Stock and 231,239 Warrants2 to purchase Common Shares owned by Technology and 1,427,510 shares of Common Stock and 1,496,616 Warrants2 to purchase Common Shares owned by Tech II.

(b) Percent of Class: Messrs. Marxe and Greenhouse beneficially own 9.1% of the shares outstanding, of which SSPE owns 1.8% of the outstanding shares, Technology owns 1.0% of the outstanding shares and Tech II owns 6.3% of the outstanding shares.

(c) Number of Shares as to which the person has:

(i) Sole power to vote or to direct the vote: 0

(ii) Shared power to vote or to direct the vote: 2,060,000 Common Shares1 and Warrants2 to purchase 2,120,000 Common Shares

(iii) Sole power to dispose or to direct the disposition of: 0

(iv) Shared power to dispose or to direct the disposition of:
2,060,000 Common Shares1 and Warrants2 to purchase 2,120,000 Common Shares

Item 5. Ownership of Five Percent or Less of a Class: If this statement is
being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more that five percent of the class of securities, check the following __.

Item 6.Ownership of More than Five Percent on Behalf of Another Person: Not Applicable.

Page 5 of 6 Pages

Item 7. Identification and Classification of the Subsidiary Which Acquired the Security being Reported on By the Parent Holding Company: Not Applicable.

Item 8. Identification and Classification of Members of the Group: Not
applicable

Item 9. Notices of Dissolution of Group: Not applicable.

Item 10.Certification:

By signing below I certify that, to the best of my knowledge and belief, the securities
referred to above were acquired and are held in the ordinary course of business and were not
acquired and are not held for the purpose of or with the effect of changing or influencing the
control of the issuer of the securities and were not acquired and are not held in connection with
or as a participant in any transaction having that purpose or effect.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Dated: February 13, 2012



 /s/ Austin W. Marxe
 AUSTIN W. MARXE



 /s/David M Greenhouse
 DAVID M. GREENHOUSE

Attention: Intentional misstatements or omissions of fact constitute Federal criminal violations (See 18 U.S.C. 1001).

Page 6 of 6 Pages

JOINT FILING AGREEMENT

Austin W. Marxe and David M. Greenhouse hereby agree that the Schedule 13G to which this agreement is attached is filed on behalf of each of them.

 /s/_Austin W. Marxe
Austin W. Marxe



 /s/_David M. Greenhouse
David M. Greenhouse

S5313/1
1319328.02

Grafico Azioni Plug Power (NASDAQ:PLUG)
Storico
Da Giu 2024 a Lug 2024

Grafico Azioni Plug Power (NASDAQ:PLUG)
Storico
Da Lug 2023 a Lug 2024