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About us

Our history

Beginning with the Black Hills Gold Rush, generations of families have relied on us. And we’ve been ready.

We were there when electric lights first lit up the night in Deadwood. We helped fuel a changing economy and experienced how the modern miracle of energy can change how we live.

Since 1883 energy has moved us forward. And it will shape the future.

Read more about our first 135 years

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 1.3 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 and 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 140 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.

Sustainability report

Community Impact

We care for our communities through charitable giving, outreach and employee volunteerism.

Social impact