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An assessment of the "electric productivity" of the 50 states indicates that shoring up performance gaps through energy efficiency could not only cut consumption by 30 percent, but also eliminate the need for more than 60 percent of coal-fired generation, according to a new study by the Rocky Mountain Institute. The RMI study, "Assessing the Electric Productivity Gap and the U.S. Efficiency Opportunity," determines the productivity rate of each state by measuring how much gross domestic product is generated for each kilowatt-hour consumed.

Amory Lovins