I'm honestly not sure what you mean. Like BEV emergency vehicles, or emergency vehicles to respond to electrical problems?

If the former, I'm not sure this would be the best weather for them.

If the latter, they exist; it's just slow and fiddly to bring a grid section back online, otherwise you risk other parts of the grid. Wouldn't do a lot of good to bring e.g. your neighborhood online, only to have it and the next neighborhood over immediately go back offline. So it might take more time to prep the grid for reconnection than it did to--say--fix a cable.