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.

Vision, Mission & Values

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

Social & Environmental Perspectives

We know social responsibility plays a vital role in helping us fulfill our vision and our mission.

Utilities & Businesses

We’re here to improve your life with energy. And we offer several products and services to do that.

Company History

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.

Corporate Headquarters

We’re committed to continuing to grow our company as we’ve done over the past 10 years. Learn more about our corporate headquarters in Rapid City.