That was true a few years ago. In 2018 it was down to 28%. Now it's about 24%:

"Short Term Energy Outlook -- 2019-08-06"

EIA forecasts that the share of U.S. generation from coal will average 24% in 2019 and in 2020, down from 28% in 2018.

EIA expects electric power sector demand for coal to fall by 2% in 2020, compared with an expected decline of 15% in 2019. However, planned coal plant retirements will continue to put downward pressure on overall electricity demand for the fuel. Almost 13 gigawatts of coal-fired electricity generation capacity has retired this year or is scheduled to retire by the end of 2020, accounting for 5% of the capacity existing at the end of 2018.

https://www.eia.gov/outlooks/steo/report/electricity.php

In California, it's 3.3% and that's all imported power that's on existing contracts. We will be free of this very soon https://ww2.energy.ca.gov/almanac/electricity_data/total_sys...

California is an outlier, having the advantage of being a low-demand (per capita) state with access to abundant hydro power from the NW area. As well as some of the highest power costs in the US.

Wow really? I would not have guessed anywhere near that high.

Coal has been the majority or near the majority of power generation until very recently. And it's only as low as it is now because natural gas got cheaper. https://en.wikipedia.org/wiki/Coal_power_in_the_United_State...

I have no idea how many facilities this is, but coal plants can also be retooled for gas: https://www.transalta.com/about-us/coal-to-gas/

One of my favorite graphics -- although it also includes petroleum: https://flowcharts.llnl.gov/content/assets/docs/2018_United-...