X0202 4 2006-04-10 0 0000075129 OTTER TAIL CORP OTTR 0001191492 MOUG KEVIN G 215 S CASCADE ST FERGUS FALLS MN 56537-2801 0 1 0 0 CFO & Treasurer Common Stock 2006-04-10 4 F 0 1960 28.235 D 3000 D Grants of Restricted Stock. On 4/10/2006, 1,960 shares were withheld by the Corporation to pay taxes due upon vesting of restricted stock, exempt pursuant to Rule 16b-3(e). 3,000 shares remain restricted. See below for other holdings: 1. Direct holding of 799.8919 shares held jointly with his wife in the Dividend Reinvestment Plan. 2. Direct holding of 631.3923 shares held in the Employee Stock Purchase Plan. 3. Direct holding of 10,223 shares which no longer carries the restriction. 4. Indirect holding of 185.9798 shares held by ESOP. 5. Indirect holding of 11.4054 shares held by his children in custodian accounts. 6. 25,000 stock options with expiration date of 4/8/2011. /s/ Kevin G Moug by Debra J Lill -POA 2006-04-12