MidAmerican Energy Company provides electric service to more than 680,000 customers and natural gas service to more than 660,000 customers in Iowa, Illinois, Nebraska and South Dakota. MidAmerican Energy maintains its headquarters in Des Moines, Iowa. MidAmerican Energy Company is a subsidiary of MidAmerican Energy Holdings Company, a global leader in the production of energy from diversified fuel sources, including geothermal, natural gas, hydroelectric, nuclear, coal and wind. MidAmerican also leads in the supply and distribution of energy in the United States and the United Kingdom consumer markets with approximately 5 million electricity and gas customers. MidAmerican Energy Company is the largest utility in Iowa. MidAmerican Energy Company s locations include Des Moines, Iowa.