Black Hills Corporation Announces Conference Call To Discuss First Quarter 2008 Results and Recent Events

For Information Contact: Dale T. Jahr, Director, Investor Relations

RAPID CITY, SD—April 23, 2008—Black Hills Corporation (NYSE: BKH) will hold a conference call on Thursday, May 1, 2008 beginning at 11:00 a.m. Eastern Time to discuss first quarter 2008 earnings results and recent events.

The conference call will be open to the public. The call can be accessed by dialing,
toll-free, (888) 639-6205. When prompted, indicate that you wish to participate in the “Black Hills Conference Call.”

A replay of the conference call will be available through May 8, 2008 by dialing
(800) 475-6701 (USA) or (320) 365-3844 (international). The access code is 919871.

Black Hills Corporation is an integrated energy company. Our utilities are Black Hills Power, an electric utility serving western South Dakota, northeastern Wyoming and southeastern Montana; and Cheyenne Light, Fuel & Power, an electric and gas distribution utility serving the Cheyenne, Wyoming vicinity. Black Hills Energy, the non-regulated energy business unit, generates electricity, produces natural gas, oil and coal, and markets energy. More information is available at our Internet web site: www.blackhillscorp.com.