Not sure how they come up with such a number, but California is large and has many electricity providers.
But for PG&E in the Bay Area, let me quote from my PG&E electric bill here in hand:
Daytime: $0.53476 (delivery) + $0.25069 (generation) = $0.785/kWh
Part-peak: $0.28917 (delivery) + $0.10643 (generation) = $0.396/kWh
Night: $0.13578 (delivery) + $0.03968 (generation) = $0.175/kWh
The cheapest rate is 17.5 cents per kWh, that is late at night (currently after 11pm, soon to be changed to be after midnight).
Daytime rate is 78.5 cents per kWh! This is PG&E in the Bay Area.
PG&E doesn't serve all of California. While we're being pedantic, PG&E's (non-low-income) rates are generally closer to $0.20-$0.30 per kWh. Their rates are a bit too complex to easily summarize but during peak hours you are pretty much guaranteed to be paying more than $0.20/kWh (and in many cases above $0.25/kWh). Off-peak rates are all above $0.12/kWh, generally more than $0.16/kWh.
Someone else pointed out that your statements about deaths are false. So I'll point out that California's electricity isn't 22¢/kWh. The California average is 16.06¢.
https://www.eia.gov/electricity/state/
States that have it worse: