NorthWestern Energy, 1232 22nd Avenue South, Brookings, South Dakota, 57006

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Providing reliable and affordably priced electricity and natural gas, Northwestern Energy began serving customers in 1923 under the name NorthWestern Public Service. Supplying energy to approximately 650,000 residential, commercial, and rural consumers, the energy utility operates in more than 100 South Dakota, Montana, and Nebraska communities. With a service territory of over 107,000 square miles, the supplier covers 73% of Montana. The company owns and operates production, transmission, and distribution systems for natural gas. Northwestern Energy also maintains ownership of high-voltage transmission and distribution systems for electricity produced by wind, water, natural gas, and coal. Since the corporation values energy conservation, rebates and incentives encourage the use of renewable and efficient sources. Commercial, industrial, and irrigation consumers may also enjoy the discounts and savings.