It seems likely to happen again. Many US utility coal fired power plants are scheduled for retirement and will not be replaced with new coal facilities. [1]

China is building lots of new coal generation, but also lots of new solar so coal use will be reduced during daylight (not the way a coal plant wants to run, but they'll adapt)

Give it a few more years and data centers with onsite coal will look like a genius cost cutting idea. Never mind all the pollution.

[1] https://ieefa.org/resources/nowhere-go-down-us-coal-capacity...