Otter Tail Corp — Director's Dealing 2011

May 17, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Otter Tail Corp (OTTR)
CIK: 0001466593
Period of Report: 2011-05-16

Reporting Person: MOUG KEVIN G (CFO & Treasurer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-05-16	Common Stock	S	254	$22.12	Disposed	40828	Direct
2011-05-16	Common Stock	S	900	$22.13	Disposed	39928	Direct
2011-05-16	Common Stock	S	200	$22.14	Disposed	39728	Direct
2011-05-16	Common Stock	S	400	$22.15	Disposed	39328	Direct
2011-05-16	Common Stock	S	300	$22.17	Disposed	39028	Direct
2001-05-16	Common Stock	S	300	$22.18	Disposed	38728	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	233.0223	Indirect
Common Stock	256.066	Indirect

Footnotes

F1: Total direct holdings include shares jointly held with spouse representing shares from the Dividend Reinvestment Plan and the Employee Stock Purchase Plan. Also includes shares acquired individually pursuant to Restricted Stock Awards and Performance Award distributions.