There are varying levels of dispatch-ability. You can ensure coal is on. And you can also turn it off. You just can't do it near instantaneously. It's exists b

There are varying levels of dispatch-ability. You can ensure coal is on. And you can also turn it off. You just can't do it near instantaneously. It's exists between something like nuclear (which has to just be on for months at a time) and natural gas peaker plants (which turn off and one during the day to meet demand. You could, for example, run coal plants during the winter (when there is little sun) and not during the summer. Or you could run coal on cloudy days. Or just turn it off on weekends.