NorthWestern Energy Group 

NorthWestern Energy Group Inc provides electricity and natural gas services in the Upper Midwest and Northwest of the U.S. in the states of Montana, South Dakota, Nebraska, and Yellowstone National Park. The company's primary segments include Electric, which includes the generation, purchase, transmission, and distribution of electricity, and Natural Gas, which includes the production, purchase, transmission, storage, and distribution of natural gas. It uses thermal, wind, hydro, or renewable energy in varying quantities, depending on the location of the facilities, to generate power. The company derives the majority of its revenue from the Electric segment.