Lets understand this problem with some facts.
In 2020, California consumed 1380.7 trillion BTU's of motor gasoline in the transportation sector [
cite].
In 2021 California produced 193,569 GW-hr of electrical power. [
cite]
The average electric car kWh per 100 miles (kWh/100 mi) is 34.6. This works out as 0.346kWh per mile. [
cite]
Gasoline contains about 120k btu per gallon. A 30 MPG car will therefore consume 4000 BTU
th per mile.
California gasoline consumption equates to 3.5x10
11 miles driven, assuming 30MPG. For average electric cars to travel this distance, they would consume 1.2x10
11 kw-hr.
1.2x10
14 wh-hr / 1.94x10
14 ≈ 0.62.
Conclusion:
If all gasoline energy used for transportation in California were to be replaced with electrical power (with the above assumptions) the electrical demand from transportation would consume 62% of existing generating capacity.California will need to massively increase it's electrical generation capacity if this proposal is to work.