From Beyond the Numbers: Prices & Spending, vol. 10, no. 10 (U.S. Bureau of Labor Statistics, May 2021), "
Trends in electricity prices during the transition away from coal" by William B. McClain:
Shifts in fuel mix over time
In the United States, the generation of baseload electricity, defined by the Energy Information Administration as the minimum amount of electric power required to maintain mechanical and thermal efficiency of the grid system, historically was met through large coal-powered plants. Starting in the early 2000s, there was rapid growth in domestically produced natural gas from shale formations and other nonconventional sources. As a result, natural gas prices declined 60.1 percent between 2003 and 2019. This, combined with rapid advances in technology for renewable generation, supported a shift away from coal. In addition to being a source of baseload power itself, natural gas has the ability to quickly ramp up, which helps handle intermittency from renewable power sources like the sun or wind. Chart 3 [Below] illustrates the share of total U.S. electric power generation from 1990 to 2019, by fuel source. The chart shows the stark decline of coal and the growth in natural gas and renewable power. Relative fuel-mix contributions from nuclear and hydroelectric power sources have both remained relatively flat over the period. [Footnotes omitted.]
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