Black Hills Corporation Announces Conference Call To Discuss Third Quarter 2007 Financial Results and Recent Events

For Information Contact: Mark T. Thies, Executive Vice President; Dale T. Jahr, Director, Investor Relations

RAPID CITY, SD—October 24, 2007—Black Hills Corporation (NYSE: BKH) will hold a conference call on Friday, November 2, 2007 beginning at 11:00 a.m. Eastern Time to discuss third quarter 2007 earnings results and recent events.

The conference call will be open to the public. The call can be accessed by dialing, toll-free, (800) 230-1096. When prompted, indicate that you wish to participate in the “Black Hills Conference Call.”

A replay of the conference call will be available through November 16, 2007 by dialing (800) 475-6701 (USA) or (320) 365-3844 (international). The access code is 892112.

Black Hills Corporation is an integrated energy company. Our retail businesses 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 wholesale 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.