Elk Ridge Mining and Reclamation, LLC. is a subsidiary of Tri-State Generation and Transmission Association, headquartered in Westminster, Colorado. Tri-State is a not-for-profit wholesale electric power supplier owned by the 44 electric cooperatives that it serves throughout a 200,000 square-mile service territory across Colorado, Nebraska, New Mexico and Wyoming.
The organization was formed in 1992 to coordinate mining operations for Tri-State at the newly-developed New Horizon Mine near Nucla, Colo. Today, Elk Ridge Mining and Reclamation, LLC. continues to manage and operate New Horizon Mine, as well as Colowyo Mine near Meeker, Colo. – both of which provide coal to Tri-State baseload power plants.