Hallador Energy Company is an energy company operating in the state of Indiana. The Company's segments include Coal Operations (operated by Sunrise Coal, LLC) and Electric Operations (operated by Hallador Power Company, LLC). The Coal Operations segment includes the operating mining complexes Oaktown 1 and 2 underground mines, Prosperity surface mine, Freelandville surface mine, and Carlisle wash plant. The Electric Operations segment includes the electric power generation facilities of the Merom Power Plant. The Oaktown Mining Complex is a coal mining and processing operation located in Knox and Sullivan counties, Indiana, and Crawford and Lawrence counties, Illinois. The Oaktown Mining Complex operations consist of two active underground mines, Oaktown Fuels No. 1 Mine and Oaktown Fuels No. 2 Mine, and related infrastructure. The Company holds other recoverable coal reserves in the Illinois Basin (ILB). Its subsidiaries include Sunrise Energy, LLC, Sycamore Coal, Inc., and others.