I could be wrong here, but it seems Texas should have the same problem in extreme heat conditions if this was truly about the power grid.
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My understanding is that the batteries that the windmills load can only hold so much power. So, once the batteries were dead, and all the windmills frozen, there was nothing to "refill" the batteries. Same with solar, the batteries can only hold so much power.
TX had plenty of power. But the fed restrictions on emissions forced them to limit the use of coal to compensate for the frozen turbines.
And for those bitching about why we didnt winterize the system: that process is expensive AND it reduces overall efficiency. Since TX never gets snowstorms like that, it made sense not to winterize.
The point here is that solar is great but not 100% reliable in extended sunless weather. Wind power seems great but kills millions of bird and is also not reliable in bad weather.
Also, Biden lifted the restriction Trump enacted on Chinas access to our grid. So thats another possible factor
Solar is irrelevant in this situation all they had to do was increase the power to offset it, instead they cut it
I recall energy storage being a huge issue for solar and wind, the banks of batteries needed would be huge. (might be getting better with technology).
Battery tech has stagnated. The remaining barriers are huge.