Average weekly coal commodity spot prices (dollars per short ton) Coal commodity regions Week ending Central Appalachia 12,500 Btu, 1.2 SO 2 Northern Appalachia 13,000 Btu, 3.0 SO 2 Illinois Basin 11,800 Btu, 5.0 SO 2 Powder River Basin 8,800 Btu, 0.8 2