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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1. Name and Address of Reporting Person * Altschaefl Michael W   2. Issuer Name and Ticker or Trading Symbol ORION ENERGY SYSTEMS, INC. [OESX] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) ALBANY-CHICAGO COMPANY LLC, 8200 100TH STREET 3. Date of Earliest Transaction (Month/Day/Year) 05/23/2011 (Street) PLEASANT PRAIRIE, WI 53158 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 Common Stock 05/23/2011   A   3,282 A $ 0 (1) 25,700 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

Stock Options (right to buy)

$ 4.19

05/23/2011

A

22,045

05/23/2012(2)

05/23/2021

Common Stock

22,045

$ 0

22,045

D

Stock Options (right to buy)

$ 3.81

10/30/2010(3)

10/30/2019

Common Stock

5,291

5,291

D

Stock Options (right to buy)

$ 3.46

05/18/2011(4)

05/18/2020

Common Stock

19,912

19,912

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Altschaefl Michael W ALBANY-CHICAGO COMPANY LLC 8200 100TH STREET PLEASANT PRAIRIE, WI 53158	X

Signatures

/s/ Steven R. Barth, Attorney-in-Fact		05/25/2011
**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)	Shares granted in lieu of cash for quarterly retainer and annual Committee Chairman fees pursuant to Issuer's 2004 Stock and Incentive Awards Plan.
(2)	Grant to reporting person of option to buy shares under the 2004 Stock and Incentive Awards Plan. This option, granted May 23, 2011, vests and becomes exercisable in three equal installments on May 23, 2012, 2013 and 2014, respectively.
(3)	Grant to reporting person of option to buy shares under the 2004 Stock and Incentive Awards Plan. This option, granted October 30, 2009, vests and becomes exercisable in three equal installments on October 30, 2010, 2011 and 2012, respectively.
(4)	Grant to reporting person of option to buy shares under the 2004 Stock and Incentive Awards Plan. This option, granted May 18, 2010, vests and becomes exercisable in three equal installments on May 18, 2011, 2012 and 2013, respectively.

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