From the same place you get power when your nuclear powerplant is offline for maintenance?
If you have 10 plants, 1 is fown for maintenance at the time, obviously all wind turbined are affected simultaneously
From places where it is blowing?
High pressure weather systems (low wind speed) can cover a large area. I suppose on those days there is probably more sunlight though.
They don’t have the data posted yet but there was an event in Alberta recently where there was no wind and this caused the price to be very high. So you either don’t use your AC on a hot still day or you get a giant bill.
Looking through may 2021 I see instances in which actual wind power delivered is zero.