It reminds me of the riddle:
“What did Socialists use for light before they had candles?
Answer: Electricity”
Since around 50% of our electric power is coal fired, this is going to be more than a “brown out”. Close to half of the grid will be down at any given time if he shuts down ALL coal plants.
It would take about ten years to build enough gas fired plants to replace them and that if the turbine and boiler manufacturers can keep that pace with the components.