>>>>>> The 19% would be at peak operation. The coal power plants have to have sufficient resources to take up the slack when wind generators are not operating at capacity. Just as when the wind generated load decreases, the more reliable source has to over-produce. This causes the consumption of more coal. <<<<<<<<
Somebody has fed you a line of BULL.
Nope. That is they way it works. Since wind energy is not consistent, backups are essential. Coal, oil, etc. plants are that backup. When the grid picks up the loss from the wind source, they request from the coal/oil source.
That's for sure!