BLACK HILLS CORP. ANNOUNCES NEW VICE PRESIDENT,
STRATEGIC PLANNING AND DEVELOPMENT

Media Contacts:
Lynn Wilson 605-721-2774
Media Relations Line:
866-243-9002
Investor Relations:
Jason Ketchum 605-721-2765

RAPID CITY, S.D., September 25, 2008 — Black Hills Corp. (NYSE: BKH) today announced the promotion of Richard W. Kinzley to the position of vice president, strategic planning and development effective immediately. Kinzley replaces Maurice T. Klefeker, who resigned in August to pursue other interests.

David Emery, chairman, president and chief executive officer for Black Hills Corp., said that Kinzley has distinguished himself as a member of Black Hills’ corporate development team for nearly 10 years, where he has played a key role in many of the company’s major acquisition and divestiture projects. “Rich’s recent contributions to the success of the Aquila acquisition demonstrate his readiness for this new level of responsibility,” Emery said. “The leadership and teamwork Rich provided to this effort was critical to the success we are enjoying today.”

Kinzley is a University of South Dakota graduate and a certified public accountant. Prior to joining the company in 1999, he worked for nine years in public accounting with KPMG in Omaha, Neb., and Ketel Thorstenson in Rapid City and spent two years with Sodak Gaming in Rapid City.

ABOUT BLACK HILLS CORP.
Black Hills Corp. — a diversified energy company with a tradition of exemplary service and a vision to be the energy partner of choice — is based in Rapid City, South Dakota with corporate offices in Golden, Colorado and Omaha, Nebraska. The utility companies serve 750,000 natural gas and electricity customers in Colorado, Iowa, Kansas, Montana, South Dakota and Wyoming. The company’s non-regulated businesses generate wholesale electricity, produce natural gas, oil and coal, and market energy. Black Hills employees partner to produce results that improve life with energy. More information is available at www.blackhillscorp.com.