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 * KNUTSON PAUL L   2. Issuer Name and Ticker or Trading Symbol Otter Tail Corp [OTTR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) VP of Human Resources (Last) (First) (Middle) 215 S CASCADE ST 3. Date of Earliest Transaction (Month/Day/Year) 02/05/2018 (Street) FERGUS FALLS, MN 56537-2801 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 02/05/2018   A   4,488 (1) A $ 41.325 7,849 D   Common Stock 02/05/2018   F   1,903 D $ 41.325 5,946 (2) 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

Restricted Stock Units

(3)

02/05/2018

A

800

02/06/2019(4)

(4)

Common Stock

800

$ 0

800

D

Restricted Stock Units

(3)

02/06/2016(6)

(6)

Common Stock

450

450

D

Restricted Stock Units

(3)

02/06/2020(8)

02/06/2020(8)

Common Stock

6,400

6,400

D

Restricted Stock Units

(3)

02/06/2017(5)

(5)

Common Stock

825

825

D

Restricted Stock Units

(3)

02/06/2018(7)

(7)

Common Stock

800

800

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
KNUTSON PAUL L 215 S CASCADE ST FERGUS FALLS, MN 56537-2801			VP of Human Resources

Signatures

/s/ Paul L Knutson by Ella Leapaldt, Attorney-in-Fact		02/07/2018
**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)	Represents shares received upon the vesting of certain performance criteria in connection with a Performance Shares Award(granted in 2015).
(2)	Total direct holding include shares acquired through the Dividend Reinvestment Plan, Restricted Stock Units and Performance Share Awards.
(3)	Each restricted stock unit represents a contingent right to receive one share of Otter Tail Corporation stock.
(4)	The restricted stock units vest in four equal annual installments beginning the date shown above.
(5)	The restricted stock units vest in four equal annual installments which began February 6, 2017.
(6)	The restricted stock units vest in four equal installments which began February 6, 2016.
(7)	The restricted stock units vest in four equal annual installments beginning February 6, 2018.
(8)	These restricted stock units vest in one installment on February 6, 2020.

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