You might be surprised at the rigor applied in studies like the NREL Standard Scenarios, viewable here: https://scenarioviewer.nrel.gov/ https://scenarioviewer.

You might be surprised at the rigor applied in studies like the NREL Standard Scenarios, viewable here: https://scenarioviewer.nrel.gov/ https://scenarioviewer.nrel.gov/. I'm guessing the Twin Cities region doesn't actually see 42 days of overcast skies, but if it does, that can be captured in these studies. And transmission is important - load in the Twin Cities area does not have to be served by generation in that area.