Sec Form 4 Filing - LIEBE ARVID R @ Otter Tail Corp - 2012-05-14

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 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 LIEBE ARVID R 2. Issuer Name and Ticker or Trading Symbol Otter Tail Corp [ OTTR] 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) 215 S CASCADE ST 3. Date of Earliest Transaction (MM/DD/YY) 05/14/2012 (Street) FERGUS FALLS, MN56537-2801 4. If Amendment, Date Original Filed (MM/DD/YY) 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 (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 05/14/2012 S 700 D $ 21.492 18,143.3975 D Common Stock 05/14/2012 S 300 D $ 21.4949 17,843.3975 ( 1 ) D Common Stock 4,478.941 I By IRA

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 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 Phantom Stock Units (right to buy) ( 2 ) ( 3 ) ( 4 ) Common Stock 5,941.054 5,941.054 ( 5 ) D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other LIEBE ARVID R 215 S CASCADE ST FERGUS FALLS, MN56537-2801 X Signatures /s/ Arvid R Liebe by Debra J Lill, Attorney-in-Fact 05/15/2012 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Total direct holdings include shares held in the Dividend Reinvestment Plan and shares acquired pursuant to Restricted Stock Award distributions. ( 2 )1 -for -1 ( 3 )There is no specific "Exercisable Date" on the Phantom Stock Award. ( 4 )There is no specific "Expiration Date" on this Phantom Stock Award. ( 5 )Phantom Stock Units acquired under the 1999 Stock Incentive Plan at fair market value as part of the Compensation Program for outside Directors.

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 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).

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