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However, by the mid-1960's, production had fallen to about 4 million tons - mostly due to the elimination of coal-fired locomotives, which severely impacted coal mining throughout the western U.S. However, during the 1970's, rising oil prices - along with the Clean Air Act, which drove an increase in demand for Utah's low-sulfur coal - sparked a boom in Utah coal mining. Annual production rose dramatically to 13.2 million tons in 1980, and then continued to climb to 22.1 million tons in 1990 and 26.0 million tons in 2006.<ref>[http://tonto.eia.doe.gov/ftproot/coal/0576.pdf State Coal Profiles], Energy Information Administration, pp. 91-8 - cached copy at [http://coaldiver.org/documents/state-coal-profiles-doe-eia-january-1994 CoalDiver.org]</ref><ref>Nancy Taniguchi, [http://www.media.utah.edu/UHE/c/COALMINING.html Coal Mining in Utah], Utah History Encyclopedia, 1994.</ref>
The 1970's boom in Utah coal mining also drove a boom in coal-fired power plant construction. Out of Utah's 5,080 MW of coal-fired generating capacity, 93% comes from plants built since 1974 - unusual in the U.S., where the median coal plant was built in 1964.<ref name="EIA"/>{{#evpev:youtube|PZUx6stYJ9U|400|right|Utah Battles for Clean Power.|right|200frame}}
==Studies on Coal Use in Utah==
