POWER OF ATTORNEY      I, John MacFarlane, do hereby constitute and appoint JOHN D. ERICKSON and GEORGE A. KOECK, orany one of them, my Attorney-in-Fact for the purpose of signing, in my name and on my behalf asDirector of Otter Tail Corporation, the Annual Report of Otter Tail Corporation on Form 10-K forits fiscal year ended December 31, 2008, and any and all amendments to said Annual Report, and todeliver on my behalf said Annual Report and any and all amendments thereto, as each thereof is sosigned, for filing with the Securities and Exchange Commission pursuant to the Securities ExchangeAct of 1934, as amended.Date: February 3, 2009              /s/ John MacFarlane   John MacFarlane     In Presence of:        /s/ Arvid R. Liebe         /s/ Nathan Partain         
 

 
     POWER OF ATTORNEY      I, Karen Bohn, do hereby constitute and appoint JOHN D. ERICKSON and GEORGE A. KOECK, or anyone of them, my Attorney-in-Fact for the purpose of signing, in my name and on my behalf asDirector of Otter Tail Corporation, the Annual Report of Otter Tail Corporation on Form 10-K forits fiscal year ended December 31, 2008, and any and all amendments to said Annual Report, and todeliver on my behalf said Annual Report and any and all amendments thereto, as each thereof is sosigned, for filing with the Securities and Exchange Commission pursuant to the Securities ExchangeAct of 1934, as amended.Date: February 3, 2009              /s/ Karen Bohn   Karen Bohn     In Presence of:        /s/ John D. Erickson         /s/ Lauris N. Molbert         
 

 
     POWER OF ATTORNEY      I, Arvid Liebe, do hereby constitute and appoint JOHN D. ERICKSON and GEORGE A. KOECK, or anyone of them, my Attorney-in-Fact for the purpose of signing, in my name and on my behalf asDirector of Otter Tail Corporation, the Annual Report of Otter Tail Corporation on Form 10-K forits fiscal year ended December 31, 2008, and any and all amendments to said Annual Report, and todeliver on my behalf said Annual Report and any and all amendments thereto, as each thereof is sosigned, for filing with the Securities and Exchange Commission pursuant to the Securities ExchangeAct of 1934, as amended.Date: February 3, 2009              /s/ Arvid Liebe   Arvid Liebe     In Presence of:        /s/ Michelle Kommer         /s/ George A. Koeck         
 

 
     POWER OF ATTORNEY      I, Edward J. McIntyre, do hereby constitute and appoint JOHN D. ERICKSON and GEORGE A. KOECK,or any one of them, my Attorney-in-Fact for the purpose of signing, in my name and on my behalf asDirector of Otter Tail Corporation, the Annual Report of Otter Tail Corporation on Form 10-K forits fiscal year ended December 31, 2008, and any and all amendments to said Annual Report, and todeliver on my behalf said Annual Report and any and all amendments thereto, as each thereof is sosigned, for filing with the Securities and Exchange Commission pursuant to the Securities ExchangeAct of 1934, as amended.Date: February 3, 2009              /s/ Edward J. McIntyre   Edward J. McIntyre     In Presence of:        /s/ James B. Stake         /s/ Gary Spies         
 

 
     POWER OF ATTORNEY      I, Joyce Nelson Schuette, do hereby constitute and appoint JOHN D. ERICKSON and GEORGE A.KOECK, or any one of them, my Attorney-in-Fact for the purpose of signing, in my name and on mybehalf as Director of Otter Tail Corporation, the Annual Report of Otter Tail Corporation on Form10-K for its fiscal year ended December 31, 2008, and any and all amendments to said Annual Report,and to deliver on my behalf said Annual Report and any and all amendments thereto, as each thereofis so signed, for filing with the Securities and Exchange Commission pursuant to the SecuritiesExchange Act of 1934, as amended.Date: February 3, 2009              /s/ Joyce Nelson Schuette   Joyce Nelson Schuette     In Presence of:        /s/ Nathan Partain       /s/ Kevin Moug         
 

 
     POWER OF ATTORNEY      I, Nathan Partain, do hereby constitute and appoint JOHN D. ERICKSON and GEORGE A. KOECK, orany one of them, my Attorney-in-Fact for the purpose of signing, in my name and on my behalf asDirector of Otter Tail Corporation, the Annual Report of Otter Tail Corporation on Form 10-K forits fiscal year ended December 31, 2008, and any and all amendments to said Annual Report, and todeliver on my behalf said Annual Report and any and all amendments thereto, as each thereof is sosigned, for filing with the Securities and Exchange Commission pursuant to the Securities ExchangeAct of 1934, as amended.Date: February 3, 2009              /s/ Nathan Partain   Nathan Partain     In Presence of:        /s/ John MacFarlane       /s/ Arvid R. Liebe         
 

 
     POWER OF ATTORNEY      I, Gary Spies, do hereby constitute and appoint JOHN D. ERICKSON and GEORGE A. KOECK, or anyone of them, my Attorney-in-Fact for the purpose of signing, in my name and on my behalf asDirector of Otter Tail Corporation, the Annual Report of Otter Tail Corporation on Form 10-K forits fiscal year ended December 31, 2008, and any and all amendments to said Annual Report, and todeliver on my behalf said Annual Report and any and all amendments thereto, as each thereof is sosigned, for filing with the Securities and Exchange Commission pursuant to the Securities ExchangeAct of 1934, as amended.Date: February 3, 2009              /s/ Gary Spies   Gary Spies     In Presence of:        /s/ Michelle Kommer       /s/ Edward James McIntyre         
 

 
     POWER OF ATTORNEY      I, James Stake, do hereby constitute and appoint JOHN D. ERICKSON and GEORGE A. KOECK, or anyone of them, my Attorney-in-Fact for the purpose of signing, in my name and on my behalf asDirector of Otter Tail Corporation, the Annual Report of Otter Tail Corporation on Form 10-K forits fiscal year ended December 31, 2008, and any and all amendments to said Annual Report, and todeliver on my behalf said Annual Report and any and all amendments thereto, as each thereof is sosigned, for filing with the Securities and Exchange Commission pursuant to the Securities ExchangeAct of 1934, as amended.Date: February 3, 2009              /s/ James Stake   James Stake      In Presence of:        /s/ Edward James McIntyre       /s/ Gary Spies