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For the first time in decades, the country’s utilities used as much natural gas-generated electricity as power from coal-fired plants, according to preliminary numbers released by the U.S. Energy Information Administration on Friday.

Each fuel represented 32 percent of the country’s total electric generation in April at about 96 million megawatt hours each.

The EIA pointed out that overall demand for electricity was low in April because of mild spring temperatures and that natural gas was selling at a 10-year low.