X0202 4 2006-04-10 0 0000075129 OTTER TAIL CORP OTTR 0001191491 MOLBERT LAURIS N 215 S CASCADE ST FERGUS FALLS MN 56537-2801 0 1 0 0 COO & Exec Vice Pres Common Stock 2006-04-10 4 F 0 3762 28.235 D 5500 D Grants of Restricted Stock. On 4/10/2006, 3,762 shares were withheld by the Corporation to pay taxes due upon vesting of restricted stock, exempt pursuant to Rule 16b-3(e). 5,500 shares remain restricted. See below for other holdings: 1. Direct holding of 9,372 shares held in "street name" with Wells Fargo. 2. Direct holding of 5,313 shares which no longer carries the restriction. 3. Indirect holding of 201.7597 shares held by ESOP. 4. 50,000 stock options with expiration date of 4/8/2011. /s/ Lauris N Molbert by Debra J Lill -POA 2006-04-12