California, at least its CAISO grid [1], is more like "renewables supplemented by combined cycle gas plants." The change is fairly recent.
Annual real power [2] generated by gas plants in CAISO reached its all time high in 2014 at 11707 MW. In 2014 generation from renewables was only 5418 MW. Renewables have increased and gas has declined every year since. The crossover first happened in 2017 when gas power dipped to 7396 MW and renewables rose to 9671 MW. For 2019, gas is down to 6835 MW (to date) and renewables are up to 10507 MW (also to date).
Sorry that I don't have a quick citation for these numbers, but the raw data is here:
[2] Annual real power meaning number of megawatt hours generated in the year divided by number of hours in the year; this implicitly accounts for differing capacity factors.
Solar and wind add up to 25.5% of generation, as compared to over 40% natural gas. Add hydro and geothermal and renewables rise to 43%, still far from the 100:70 renewable to gas ratio you claimed. But hydroelectric and geothermal are geographically limited, the plan is still to build more solar and wind, with gas plants for use when demand exceeds the renewables' production.
That chart says that natural gas was 43.8% in 2018. It also gives:
Solar, 19.0%
Hydro, 12.3%
Wind, 6.5%
Geothermal, 5.7%
Wood/biomass, 2.7%
Add those renewable sources together and you get 46.2%, more (but only slightly more) than natural gas. It looks like the chart-maker's data source is the Energy Information Administration. The greater dominance of renewables that I found may be because I'm just tracking the CAISO grid. The EIA would have data covering Southern California as well.
Annual real power [2] generated by gas plants in CAISO reached its all time high in 2014 at 11707 MW. In 2014 generation from renewables was only 5418 MW. Renewables have increased and gas has declined every year since. The crossover first happened in 2017 when gas power dipped to 7396 MW and renewables rose to 9671 MW. For 2019, gas is down to 6835 MW (to date) and renewables are up to 10507 MW (also to date).
Sorry that I don't have a quick citation for these numbers, but the raw data is here:
http://content.caiso.com/green/renewrpt/
I've downloaded all the daily *.txt files and cobbled together big CSVs from them to track these sorts of statistics.
[1] http://www.caiso.com/about/Pages/default.aspx
[2] Annual real power meaning number of megawatt hours generated in the year divided by number of hours in the year; this implicitly accounts for differing capacity factors.