Water Resources Division, U.S. Geological Survey 1999 <p>Coal will remain a very significant part of U.S. energy needs (fig.l), even though there will continue to be concern about environmental impacts associated with its use. Currently, about 88 percent of U.S. coal production is used by electric utilities. The remaining 12 percent is either exported or used domestically for other industrial applications, such as coke for steel production.</p> application/pdf 10.3133/fs12099 en U.S. Geological Survey National Coal Quality Inventory (NaCQI) and U.S. Geological Survey Coal Quality Databases reports