What has already been said upthread applies, but add in a blown weather forecast and current road conditions: It seems every 3rd road has a tree and/or power line laying on it. If you're lucky, there's one lane open, if not you reroute. Also, employees are probably dealing with their families w/o power, heat and other basics. (As I type this, it's on a laptop with about 33% battery power in a 48 degree room. Still waiting for Ready-Kilowatt to return after 48 hours of AWOL)

This is far from anyone's fault here. Multiple factors lead to a unique situation unlikely to be repeated.