Unfortunately it these batteries are unable to multiple gigawatts over many hours of excess wind energy. It will be at least a decade before the battery energy storage systems are close to big enough to absorb the oversupply of wind energy that happens a few times a week.

Don't get me wrong. The BESS helps with frequency, synchronization and voltage issues. They just do very little to flatten the wind spikes without turning off 10-20% of the wind fleet.