For some years it has been obvious that increasing deployment of solar and wind is cutting into the market share of coal and nuclear power plants in the United States and Europe. These plants are being increasingly retired, and a negligible number of new plants of either technology are being built in either region.
But this is only part of the story. For the past 15 years, the United States in particular has put a massive capacity of new gas plants online, many of which are combined-cycle designs. These plants use fuel more efficiently than “peaker” plants, but also ramp more slowly, and as such are often meant for “mid-merit” applications.
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Solar and wind plus storage to increasingly replace gas plants, by Christian Roselund, PV Magazine, April 12, 2018.