BLACK HILLS ENERGY

Black Hills Energy is a natural gas and electric utility serving 1.2 million customers in eight states: Arkansas, Colorado, Iowa, Kansas, Montana, Nebraska, South Dakota and Wyoming. Black Hills Energy of South Dakota is the electric service provider to about 70,000 customers in 31 communities of the Black Hills region, including northeastern Wyoming. Black Hills Energy is part of Black Hills Corp. (NYSE:BKH), a growth-oriented, vertically-integrated energy company based in Rapid City, South Dakota, with a tradition of improving life with energy and a vision to be the energy partner of choice. Black Hills Corp. also generates wholesale electricity and produces natural gas, oil and coal. More information is available at www.blackhillscorp.com and www.blackhillsenergy.com.