Illinois electricity rates in January 2021 averaged 12.30 cents per kilowatthour -- an estimated 3 percent less than the 12.69 cents per kilowatthour average rate in the U.S. overall in January 2021.
Illinois natural gas rates in January 2021 averaged 6.63 dollars per thousand cubic feet -- an estimated 32 percent less than the 9.74 dollars per thousand cubic feet average rate in the nation overall in January 2021.
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.