Illinois electricity rates in October 2016 averaged 12.54 cents per kilowatthour -- an estimated 1 percent more than the 12.45 cents per kilowatthour average rate in the U.S. overall in October 2016.
Illinois natural gas rates in October 2016 averaged 12.17 dollars per thousand cubic feet -- an estimated 11 percent less than the 13.74 dollars per thousand cubic feet average rate in the nation overall in October 2016.
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Illinois has an estimated population of 12,830,632, which ranks 7th in the nation. 
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For more information about energy in Illinois, or to learn more about IL energy, visit the EIA.