Weather forecasting is important even before solar/wind. Extreme, temporary temperature swings require the power company to be prepared for the extra power generation.

With just coal/gas/hydro, this can be mitigated much easily, but still needs to be handled with care. If not, then the lack of power generation could cause brownouts for hours or days as backup power generation takes time to spin up.

TVA experienced an issue like this in 2023, where it was inadequately ready for a winter storm: https://www.publicpower.org/periodical/article/report-examin...

Since we build for "1-in-a-100", it's expected we'll have these failures, as a 1% chance every year is a pretty high chance that will keep increasing as these power companies rely more on non-failsafe power generation strategies. Texas is the extreme example, where over-reliance on those systems caused too much damage.