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Twin City Fan Companies is a manufacturer of centrifugal fans for air and material handling. It provides a wide range of products to industrial and commercial markets, as well as original equipment manufacturers. Twin City Fan Companies have more than 25 years of experience in providing fans for various industries, including automotive, paper mills, textile, air pollution control, commercial buildings, and heating, ventilation and air conditioning. The company has a variety of divisions, including Aerovent, Twin City Fan & Blower, Clarage and Azen Manufacturing. Its Clarage division manufactures a variety of custom industrial and commercial centrifugal fans, blowers, air moving equipment, exhausters and ventilators for various industrial applications. Twin City Fan Companies is located in Aberdeen, S.D.

NorthWestern Energy is one of the largest providers of electricity and natural gas in the upper Midwest and Northwest. The company serves approximately 656,000 customers in Montana, South Dakota and Nebraska. Its utility operation comprises regulated electric and natural gas distribution, transmission and energy supply. In 2007, NorthWestern Energy received the Emergency Recovery Award from the Edison Electric Institute (EEI). The company's utility operations are subject to various federal, state and local laws and regulations.