NorthWestern Corporation, doing business as NorthWestern Energy, provides electricity and natural gas to approximately 665,000 customers in Montana, South Dakota and Nebraska. The Company has generated and distributed electricity in South Dakota and distributed natural gas in South Dakota and Nebraska and has generated and distributed electricity and distributed natural gas in Montana. The Company operates in two business segments: electric operations and natural gas operations. Its regulated electric utility business in Montana includes generation, transmission and distribution. Its service territory covers approximately 107,600 square miles, representing approximately 73% of Montana's land area. The Company distributes natural gas to approximately 181,300 customers in 105 Montana communities. It also serves several smaller distribution companies that provide service to approximately 31,000 customers.