Tri-State Generation and Transmission Association is a wholesale electric power supplier owned and governed by the 43 rural electric cooperatives that it serves across a four-state region.
Award winning surface coal mining operation for over 30 years. Average quality of coal rates at 10,325 average Btu subbituminous thermal coal. Permitted to mine 9 millions tons of coal per year.
Twenty Mile Mine produces coal for the generation of electricity through utilities located in Kansas, Mississippi, Wyoming, Iowa, Kentucky, Illinois, Texas, New Mexico, and Piedras Negras, Mexico.