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20世纪70年代中期,美国发电行业购煤已从按“吨数”付费过渡到按“能量”付费。到1980年,美国东部几乎所有的火电厂烧的煤中煤灰的含量都平均低于12%、水分含量都平均低于8%。
In the mid-1970s, coal purchases from the power generation industry in the United States had transitioned from pay-per-tonne to pay-per-energy. By 1980 almost all coal-fired ash in coal-fired power plants in the eastern United States had an average coal ash content of less than 12% and an average moisture content of less than 8%.