The UK normally gets 25% of their electricity from wind but just the other night they were only getting about 2.7% of the demand fulfilled by wind turbines. The

The UK normally gets 25% of their electricity from wind but just the other night they were only getting about 2.7% of the demand fulfilled by wind turbines. They had to start up coal plants to fill the gap. I don't think over provisioning would fix that and you'd need about 12 hours of batteries to cover the shortage.