1. During storms and other high wind times the windmills have to shut down because of the high speeds involved.
2. In winter during low wind speed, the freezing cold causes the gear box oil to freeze, so the windmills have to be fed with electricity to keep them warm.
The working guts of a wind generator.....see the white hard hat on the top of the cabinet..(upper right)...gives some idea of the size of the beast.
So Lesgo Brandon will need standby power plants to supply 10 million homes...for when there is no wind or during shutdown maintenance periods.