I'd really like to see that trended over time.
California's energy mix tends to be low due to a lack of both a heavy heating (northern climates) and cooling (southern / south-eastern) load. Housing stock has been notoriously inefficient in insulation, though newer construction gains on that.
Major usage has been in transportation. Sprawl'll do that to ya.
LLNL has historical energy usage charts, and began breaking that out by state sometime since the 1990s (possibly only in the 2000s / 2010s). History since 2010 is readily available here there's also an archive though you've got to hunt for it:
https://flowcharts.llnl.gov/commodities/energy
US EIA have 2019 data, but no trend-over-time. The map clearly shows that high per-capita energy usage is concentrated in states with either weather extremes, a large rural population, or both:
https://www.eia.gov/state/rankings/#/series/12
Intersting, New York is directly after California in per-capita usage. Rhode Island just edges out both.
A 2013 NRDC report shows that CA's per-capita usage has been flat since roughly 1980, whilst the rest of the US has increased. I suspect much of that growth is due to population increases in the South, with growing cooling load.
https://web.archive.org/web/20130714131300/http://www.nrdc.o...
Charts here: https://www.greentechmedia.com/articles/read/California-Is-P...
There may well be a case to be made that California's accomplished significant progress in energy efficiency. But I've a strong suspicion that what we're looking at instead is credit-claiming where not particularly due, based on dominant other factors. That's unfortunately rather common in this space, in both senses of the word.