“Wind power is usually given a priority on the Grid. If the wind is blowing some other source doesn’t get on.”
Out here in Washington state this year some (new?) wind farm was really cranking it out. The power company had to cut back on it’s hydroelectric output. But the reservoir was filled to the max so they had to let a bunch of water out through the spillway in a hurry. It wiped out a bunch of salmon nesting habitat.
I don’t recall if it was a problem with the engineering of the system (no “cut-off switch” or whatever from the wind farm), or if it was a legal/political thing - but the power company had to take the wind power. They have changed whatever it was so that in some cases they don’t have to now.
Hydro has been the very favorite backup source for wind developers for a lot of reasons. Partly because it's also clean and renewable and partly because under normal conditions it can be turned on and off in an instant. Since wind conditions are becoming more and more predictable that power on demand is becoming less important.