SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT
Pursuant to Section 13 or 15(d) of the
Securities Exchange Act of 1934

Date of report (Date of earliest event reported): March 26, 2007

OTTER TAIL CORPORATION

(Exact name of registrant as specified in its charter)

Minnesota
(State or other jurisdiction
of incorporation) 0-00368
(Commission
File Number) 41-0462685
(I.R.S. Employer
Identification No.)

215 South Cascade Street, P.O. Box 496, Fergus Falls, MN
(Address of principal executive offices) 56538-0496
(Zip Code)

Registrant’s telephone number, including area code: ( 866) 410-8780

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

o Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

     On March 26, 2007, Ken Nelson notified Otter Tail Corporation (the “Company”) of his decision to resign from the Company’s Board of Directors effective at the conclusion of the Company’s 2007 Annual Meeting of Shareholders on April 9, 2007. Mr. Nelson is resigning in order to devote more time to his personal business interests and not because of a disagreement with the Company.

Signature

     Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	OTTER TAIL CORPORATION
Date: March 29, 2007
	By /s/ Kevin G. Moug
	Kevin G. Moug
	Chief Financial Officer and Treasurer

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