Fewer trips (no daily commute for many, delivery vs. shopping, etc.) seems like the likely way to reduce demand.
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Even if you cut every driver's usage in half, it's still a hefty 21.5k GWh/y. Not an insignificant amount.
EDIT: Corrected units from kWh/y to GWh/y.
21.5KWh/yr is a rounding error compared to most US homes. Its $1.93 worth of electricity at my house. Tons of homes use ~1,000+kWh/month. There's also no way an average US EV would use 21.5kWh in a year, that's not even a month's worth of usage cut in half.
I get about 3.5mi/kWh in my EV. If we cut the average yearly mileage about in half to ~6,000mi, that would be ~1,700kWh at my driving efficiency, plus a bit for charging losses. Even at 4.5mi/kWh it is still ~1,333kWh.
Sorry, switched G for k in my response. That's my bad.
43,000 GWh/y for all CA EVs at the average miles per year per vehicle.
Total CA generation is 200,000 GWh/y.