In COVID Crisis, Coal Accounting For Barely More Than 15% Of US Generation During Energy Crash

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In fact, over three days earlier this month, wind and solar actually produced more electricity than coal in the U.S

The overhead to operate a coal plant is averaged over the time it is producing electricity. The longer it sits unproductive the higher those costs become further widening the gap between coal and wind and solar.

Of course because there is no fuel to purchase and wind and solar will benefit from the economy of scale their costs will continue to decrease.

There is a gap in the data for the amount of electricity being produced by solar. In the following examples:
1)PV system on a private residence
2)PV system at a company
3)PV system on a school

The electricity used during the day produced by the PV system isn't being counted unless maybe a utility is managing the system. The utility only knows about whats being sent back to the grid.