Westmoreland Coal Co is the United States-based energy mining company. The principal activities of the company conducted within the United States and Canada. Its United States operations include the production and sale of coal from mines in Montana, North Dakota, Wyoming, New Mexico, Texas, and Ohio and the ownership of the Roanoke Valley power plants, or ROVA, in North Carolina. The Canadian operations include the production and sale of coal from six surface mines in Alberta and Saskatchewan. The company organizes its operations into six divisions, namely: Coal - U.S., Coal - Canada, Coal - WMLP, Power, Heritage, and Corporate. The majority of its revenue is derived from Coal - U.S. segment.