Wind turbines shut down at -30 C to prevent them from shattering

due to cold brittle behavior of the materials that they are made of.

"Lethbridge was -30 as was Drumheller, according to The Weather Network."

Actually we have known a solid week of minus forty quite often over the years in Central Alberta.

Also, snow accumulations and ice storms are bound to shut off solar at least for a while.

Here is the AESO forecast FWIW.

https://www.aeso.ca/grid/grid-planning/forecasting/wind-and-solar-power-forecasting/