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 *   ArcLight Capital Holdings, LLC 2. Date of Event Requiring Statement (Month/Day/Year) 10/01/2010 3. Issuer Name and Ticker or Trading Symbol KEY ENERGY SERVICES INC [KEG] (Last) (First) (Middle) 200 CLARENDON STREET, 55TH FLOOR 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) BOSTON, MA 02117 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 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) Common Stock 15,807,233 (1) (2) I See Footnotes (1) (2)

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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
ArcLight Capital Holdings, LLC 200 CLARENDON STREET, 55TH FLOOR BOSTON, MA 02117	Â	  X	Â	Â

Signatures

/s/ Daniel R. Revers, Managing Partner of Arclight Capital Holdings, LLC		10/06/2010
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	The reporting person may be deemed a member of a group beneficially owning 10% or more of the common stock of the issuer within the meaning of Section 13(d) of the Securities Exchange Act of 1934. (continued in Footnote (2))
(2)	The reporting person disclaims beneficial ownership of all securities of the issuer except for shares held by OFS Energy Services, LLC, for which the reporting person is the sole manager of both ArcLight Capital Partners, LLC, the investment advisor of ArcLight PEF GP III, LLC, and ArcLight PEF GP III, LLC the general partner of ArcLight Energy Partners Fund III, L.P., the owner of 100% of the membership interests of OFS Holdings Finance, LLC, which acts as controlling owner of the membership interests of OFS Holdings, LLC, the controlling owner of the membership interests of OFS Energy Services, LLC, and this report shall not be deemed an admission that such a group exists or that the reporting person is the beneficial owner of the securities of such group for purposes of Section 16 or for any other purpose.

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