I've been updating this annually over at PriusChat for a few years and thought a few here might find this interesting:
Another great year for California, continuing to lead in grid greening. Please note that for 2018, we came off a record rainfall 2017 year which briefly inflated hydro sources.
2018 California Electrical Grid Source data:
https://ww2.energy.ca.gov/almanac/elect ... power.html
Highlights comparing 2018 to 2017:
(note units are percent total system power)
-coal mix is decreasing and only 3.30% (vast majority remains imported)
-natural gas use increased after being down for 3 consecutive years, now 34.91% of the power mix
-nuclear remains nearly stable, at 9.05%
-large hydro decreased from 14.7% to 10.68% (2017 had record rainfalls within CA)
-non-large hydro renewables grew and continue to climb rapidly, continuing a long trend, with a year-over-year 2.36% increase in the share of total power mix, to a current level of 31.36%
-wind continues to grow with new accelerating gains following some years of slowing increases, now 11.46%, up from 9.4%, briefly retaking the renewable lead from solar which took the lead for the first time in 2017
-solar (1 MW and larger facilities) increased to 11.40% (10.2% last year)
-small hydro fell as with large hydro as 2017 had a temporary burst with record rainfall that winter/spring
-still, the impact of solar above is greatly underestimated as “behind the meter” (BTM) home solar is not measured as only units generating 1MW or greater are counted; “BTM residential solar generation was estimated to be 13,582 GWh, a 20 percent increase from 2017”; therefore California probably gets ~17% total system electric generation from all sources of solar PV
-California total system electric generation was down 2 percent from 2017 and a major factors cited wereenergy efficiency programs and residential installs of BTM residential solar PV systems that directly displaced utility-supplied generation.
-California's non CO2 emitting electric generation categories (nuclear, large hydroelectric, and renewables) accounted for 53 percent of its generation, compared to 56 percent in 2017. As a result, in-state generation dropped by 6 percent (11,494 GWh) to 194,842 GWh. This decrease was due, in part, to reduced generation from hydroelectric power plants as dry conditions returned to the state. Net imports increased by 6 percent (4,944 GWh) to 90,648 GWh, partially offsetting the decline.