We're pretty proud of our 130-year history, which started in the days of the prospectors, the faro dealers and the dance-hall girls.

We are a growth-oriented, vertically integrated energy company with a mission of improving life with energy and a vision to be the energy partner of choice. Based in Rapid City, South Dakota, the company serves 1.2 million natural gas and electric utility customers in eight states. The company's non-regulated businesses generate wholesale electricity and produce natural gas, oil and coal.

We emphasize the traits that have contributed to our success in the past and will be critical to our success in the future.

Were committed to continuing to grow our company as weve done over the past 10 years. Learn more about our corporate headquarters in Rapid City.