Comment by goldenarm

It's impressive to see the battery capacity growing on ElectricityMaps over the years : https://app.electricitymaps.com/map/zone/US-CAL-CISO/yearly

But why is the utilization rate so low? It was barely 0.8% of electricity in California last year.

Edit: Got the answer, the batteries fire up around 6pm during the evening peak at around 9GW for ~25% of the total consumption. We would need approximately 5x more batteries and renewable power to move out of carbon-intensive production entirely.