Why do the electric bills keep increasing?
Or, put differently, rates are high exactly because California per-capita usage is low -- fewer kWh across which to amortize costs.
Importantly, while California rates are relatively high, customer's bills are not -- because the customers use less electricity.
Also, net metering and widespread consumer generation (largely solar) means that the fixed infrastructure costs are actually amortized not across the low total energy usage, but across a fraction of the total, already low, usage.
Clearly you have never dealt with SDG&E, home of the highest residential electricity rates in the country. And yes that translates to astronomical electricity bills for households