X0202 4 2007-04-09 0 0000075129 OTTER TAIL CORP OTTR 0001180965 PARTAIN NATHAN I 215 S CASCADE ST FERGUS FALLS MN 56537-2801 1 0 0 0 Common Stock 2007-04-09 4 A 0 1900 35.045 A 4500 D Shares of Common Stock acquired under the Corporation's Stock Incentive Plan, which is a grant of Restricted Stock. The 1,900 shares granted 4/9/07 have a grant price of $35.045 and vest at 25% yearly commencing 4/8/08. See below for other holdings: 1. Direct holding of 1,000 shares of Common Stock held in "street name" with Merrill Lynch. 2. Direct holding of 5,186.0365 shares of Common Stock held in the Dividend Reinvestment Plan. 3. Indirect holding of 1,600 shares of Common Stock held by an IRA. 4. 2,000 stock options with expiration date of 4/9/2010. 5. 2,000 stock options with expiration date of 4/8/2011. /s/ Nathan I Partain by Debra J Lill -POA 2007-04-11