Black Hills Corporation is an integrated energy company. The Company operates in the United States with two business groups: Utilities and Non-regulated Energy. Its Utilities Group is comprised of regulated Electric Utilities and regulated Gas Utilities segments, and its Non-regulated Energy Group is comprised of Power Generation, Coal Mining, and Oil and Gas segments. It conducts its electric utility operations and combination electric and gas utility operations through three subsidiaries: Black Hills Power, Cheyenne Light, and Colorado Electric. Its Non-regulated Energy Group, which operates through various subsidiaries, produces and sells electric capacity and energy through a portfolio of generating plants, produces and sells coal from its mine located in the Powder River Basin in Wyoming and acquires, explores for, develops and produces natural gas and crude oil in the Rocky Mountain region.