Best utilities companies in Rapid City, SD

They're a diversified energy company with a tradition of exemplary service and a vision to be the energy partner of choice. Their company is based in Rapid City, S.D., and they have corporate offices in Denver and Papillion, Neb. They serve 765,000 natural gas and electric utility customers in Colorado, Iowa, Kansas, Montana, Nebraska, South Dakota and Wyoming. They also have a business segment they call non-regulated that generates wholesale electricity, produces natural gas and crude oil, and mines coal. Their more-than 2,000 employees partner to produce results that improve life with energy.