Data in the U.S. Energy Information Administration's latest Short Term Energy Outlook forecasts renewable energy resources, including hydroelectricity, will generate more electricity in April and May than coal-fired plants. According to the Institute for Energy Economics & Financial Analysis, this would be the first time renewable generation has surpassed coal. While there are seasonal factors at play, the group said it represents "signs of a tipping point" in the country's generation mix.According to the EIA, all renewables will produce 18% of U.S. electricity in 2019, and almost 20% in 2020. The agency also forecasts that wind generation will surpass hydro "to become the leading source of renewable electricity in both years."