I imagine each grid is built to expected temperatures. So if it unusual for the area, it is problematic. I know my parent has similar weather in Ireland about 15 years ago and all the water pipes were frozen so they lost running water. That was about 15 degrees c colder than usual, about 10 degrees colder than I ever remember growing up. Texas has had recurrent problems too with their grid. Australia has had problems due to flooding. It’s just another effect of global warming.