I have a municipal utility company, so they don't have to worry about profit or anything like that. The lowest possible residential rate, for people who use a minimal amount of electricity at the cheapest times, is $0.2106/kWh. And that's before amortizing the daily "power access fee". Most people will be in the middle or top tier, where the marginal price can exceed $0.40/kWh.
For PG&E, it looks like electricity starts at $0.38/kWh after taxes and goes up to $0.48/kWh for heavy users[1]
For SoCal Edison, the cheapest tier is $0.36/kWh and goes up to $0.46/kWh for heavy users.
Unless there's some secret to getting cheap electricity, or the numbers in your link don't include state taxes/fees, it seems impossible to me that the average residential kilowatt-hour of electricity only costs $0.19.
Edit: FWIW, the BLS CPI calculations[3] say that rates in California metros range from $0.274-$0.475. They don't publish a CA average, but the "Pacific" regional average of $0.228/kWh is still above the $0.196/kWh figure, even after being brought down by states like Washington where electricity is ~75% cheaper than places like San Diego
[1]: https://www.pge.com/pge_global/common/pdfs/rate-plans/how-ra...
[2]: https://www.sce.com/residential/rates/Standard-Residential-R...
[3]: https://www.bls.gov/regions/midwest/data/averageenergyprices...