California's in-state and imported generation, and what sources are used for it, are documented:
https://www.energy.ca.gov/almanac/electricity_data/total_system_power.html
Note that this doesn't list what they
export (and as I understand they do export a fair amount of renewables), either, but coal is a fairly small percentage of the generation that they import, and is almost a rounding error for in-state generation.
Also, regarding hydroelectric power, the destruction behind dams is why most advocates for renewables don't typically advocate for new hydroelectric capacity any more. Using existing hydroelectric capacity is good, adding pumped hydro to an existing installation is good, but building new dams purely for hydroelectric causes a massive die-off behind the dam from the flooding. (As I understand, dams that are primarily for providing irrigation water to crops aren't anywhere near as bad, as the flooding is controlled by diverting it.)
Your points are valid, but the claims of these use numbers are only during optimal wind & solar conditions, these optimal conditions that do not exist more than 1/3rd to 1/2 of the time. When the sun does not shine and when the wind exceeds low & "high-speed" limits coal is required to be burned to fill in those gaps in what is needed to keep the grid in a functional state....
Something many do not seem to know about wind generation is that it's only able to produce power currently in a very narrow range of wind speeds high & low.
From the outside what most do not seem to know is above a range on the high wind speed side, a speed that most do not realize that high-speed limit is so low that these things are only able to produce useable power only around 30 % of the time. the rest of the time they set at full deflection to allow these things to not over spin destroying themselves during every wind storm....
Until we come up with some real storage system to store wind & solar power for use when the wind blows too high( the majority of the time the wind is too high where most of these things are installed across US). So that picture that is being put out there on kalifornia power use vers what is produced locally under optimal conditions, conditions that only exist on average 1/3rd of the time is misleading at best, a down right dishonest lie at worst that is a complete lie most of the time. No one could live in s cal in such numbers without all of that coal generating power that is used to pump water across mountain ranges so the people of s cal can turn on the tap and water come out in that desert that they all live in....
And every effort that has been made in programming to allow wind generation during higher wind speeds has shown to be a folly, destruction of safety brakes, when the brakes go out this leads directly to overspin events that lead directly to the early destruction of these multi-million $ wind turbines...
The data from the times when these wind turbines are locked down due to winds that exceed safe levels, that time when gusts or steady wind speeds exceed safe operation levels,....
Since the time when the winds are too high for safe operation is the majority of the time in ca where these wind turbines exist, this is what must be considered in this argument, to be honest, and show where that power required to make s cal inhabital that power during this time due to the taking out of operation so much of what not so long ago was used to produce the needed power today comes from coal burned in states like colorado.....
Show some real numbers that show where the required today power comes from when the sun does not shine and the 2/3rd of the time when wind farms produce no power....