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About us

Our history

We're pretty proud of our 135-year history,

Our history starts in the Black Hills, supplying electricity to Deadwood when it was a rough-and-tumble gold mining town, back in the days of Calamity Jane and Wild Bill Hickok.

Read More About Our 135-Year History

Who we are

We are a customer focused, growth-oriented utility company with a tradition of exemplary service and a vision to be the energy partner of choice. Based in Rapid City, South Dakota, the company serves over 1.25 million electric and natural gas utility customers in more than 800 communities in Arkansas, Colorado, Iowa, Kansas, Montana, Nebraska, South Dakota and Wyoming. The company generates wholesale electricity and produces natural gas, and coal. Employees partner to produce results that improve our customers’ lives with energy.

Mission, vision & values

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


Improving life with energy. Every day, we want to be improving life with energy. We produce, market and deliver the vital electricity, coal and natural gas that our customers need. Through our efforts products and services, we also share our personal energy to strengthen our communities and support growth and development.


Be the energy partner of choice. We strive to be the energy partner of choice. Whether our customers are served by our regulated or non-regulated businesses, we want them to value our service and business relationship.


We are proud of our employees; they represent what we stand for. There are several key values that have been fundamental to our success for the past 135 years, and there are others that will be vital to our future success. These are the values we feel align us to our vision and that our employees demonstrate every day.



We're committed to serving our customers with safe, reliable and affordable energy in a manner that minimizes our impact on the environment and safeguards our natural resources.

Corporate Responsibility