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

INITIAL STATEMENT OF 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 *
  MADISON DEARBORN CAPITAL PARTNERS IV LP
 2. Date of Event Requiring Statement (Month/Day/Year)
10/27/2010		 3. Issuer Name and Ticker or Trading Symbol
First Wind Holdings Inc. [WIND]
(Last)
(First)
(Middle)
THREE FIRST NATIONAL PLAZA, SUITE 4600, 70 WEST MADISON STREET		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

CHICAGO, IL 60602		 6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
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)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 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

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
MADISON DEARBORN CAPITAL PARTNERS IV LP
THREE FIRST NATIONAL PLAZA, SUITE 4600
70 WEST MADISON STREET
CHICAGO, IL 60602		     X    
MADISON DEARBORN PARTNERS IV LP
THREE FIRST NATIONAL PLAZA, SUITE 4600
70 WEST MADISON STREET
CHICAGO, IL 60602		     X    

Signatures

MADISON DEARBORN CAPITAL PARTNERS IV, L.P., By: MADISON DEARBORN PARTNERS IV, L.P., Its: General Partner, By: MADISON DEARBORN PARTNERS, L.L.C., Its: General Partner, By: Mark B. Tresnowski, Its: Managing Director 10/27/2010
**Signature of Reporting Person Date
MADISON DEARBORN PARTNERS IV, L.P., By: MADISON DEARBORN PARTNERS, L.L.C., Its: General Partner, By: Mark B. Tresnowski, Its: Managing Director 10/27/2010
**Signature of Reporting Person Date

Explanation of Responses:

No securities are beneficially owned

* 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).
 
Remarks:
Immediately prior to the closing of First Wind Holdings Inc.'s (the " Issuer's") initial public offering, all of the equity interests in First Wind Holdings, LLC owned by Madison Dearborn Capital Partners IV, L.P. ("MDCP IV") will be exchanged for Series B Membership Interests of First Wind Holdings, LLC ("Series B Membership Interests") and an equal number of shares of the Issuer's Class B Common Stock (the "reorganization").  One share of the Issuer's Class B Common Stock, together with one Series B Membership Interest, will be exchangeable at any time for one share of the Issuer's Class A Common Stock, without expiration. Madison Dearborn Partners IV, L.P., as the sole general partner of MDCP IV, may be deemed to beneficially own the securities to be issued to MDCP IV in the reorganization.

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