NorthWestern Corporation owns NorthWestern Energy a utility company that serves South Dakota Nebraska and Montana that is based in Sioux Falls. As of December 31 2007 the company serves approximately 650 000 customers. The company's corporate headquarters are located in Sioux Falls while the headquarters for the South Dakota operations (and which was the headquarters for the old NorthWestern Public Service Company) are in Huron SD.
Key people are E. Linn Draper Jr., Chairman;, Robert C. Rowe and President and CEO.