Alliant Energy's utility operations serve more than 1.4 million customers in Iowa, Illinois, Minnesota and Wisconsin. Alliant's service territory covers 54,000 square miles in the heartland of America, and includes 9,700 miles of electric transmission lines and 8,000 miles of natural gas main.


Black Hills Corp. is a diversified energy company with a tradition of exemplary service and a vision to be the energy partner of choice — is based in Rapid City, S.D. with corporate offices in Denver, Colo. and Omaha, Neb. The utility companies serve 763,000 natural gas and electricity customers in Colorado, Iowa, Kansas, Montana, Nebraska, South Dakota and Wyoming. The company’s non-regulated businesses generate wholesale electricity, produce natural gas, oil and coal, and market energy.


MidAmerican Energy Company is the largest utility in Iowa. MidAmerican provides service to more than 732,000 electric customers and 714,000 natural gas customers in a 10,600 square-mile area, from Sioux Falls, South Dakota, to the Quad Cities area of Iowa and Illinois.


NextEra Energy Duane Arnold Energy Center is Iowa's only nuclear power plant, which supplies enough power to provide for the annual needs of about 500,000 Iowa homes. A subsidiary of NextEra™ Energy Resources has a 70 percent ownership in DAEC. Central Iowa Power Cooperative has a 20 percent ownership with Corn Belt Power Cooperative holding the remaining 10 percent ownership.


ITC Midwest, a subsidiary of ITC Holdings Corp., purchased the nearly 7,000 miles of high-voltage electric transmission lines from Alliant Energy’s Interstate Power and Light subsidiary in December 2007. Headquartered in Cedar Rapids with warehouse facilities and offices in Dubuque, Iowa City, Perry and Des Moines, ITC Midwest works closely with customers to help ensure reliable electric transmission service and contribute to the growth of the region.