From the EIA:

Natural gas-fired power generation increased 19% in 2015, because of low natural gas prices, increased gas-fired generation capacity, and coal power plant retirements. EIA’s May 2016 Short-Term Energy Outlook forecasts that this year, natural gas-fired generation will exceed coal generation in the United States on an annual basis.

Growth in natural gas-fired generation capacity is expected to continue over the next several years, as 18.7 gigawatts (GW) of new capacity comes online between 2016 and 2018. Many of the new natural gas-fired capacity additions in development are near major shale gas plays. The Mid-Atlantic states and Texas have the most natural gas-fired capacity additions under construction with planned online dates within the next three years (2016–18).

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