NorthWestern Energy Group is engaged in providing electricity and/or natural gas to customers in Montana, South Dakota, Nebraska, and Yellowstone National Park. Co. manages its businesses by the nature of services provided, and operates principally in the following business segments: electric utility operations; and natural gas utility operations. Co. provided electricity and / or natural gas to approximately 764,200 customers in Montana, South Dakota, Nebraska, and Yellowstone National Park. Co. transported natural gas volumes of approximately 47 Bcf during the year ended Dec. 31, 2022.