North-Western Corporation, doing business as North-Western Energy, provides electricity and natural gas. The Company operates its business under segments: Electric operations, Natural gas operations and All other, which primarily consists of unallocated corporate costs. Electric operations segment consists of an electric utility business in Montana, which includes generation, transmission and distribution. The Company also transmits electricity for non-regulated entities owning generation facilities, other utilities and power marketers serving the Montana electricity market. The Company's South Dakota electric utility business operates as a vertically integrated generation, transmission and distribution utility. Natural gas operations segment consists of a natural gas utility business in Montana, which includes production, storage, transmission and distribution.