True story... back in the Stone Age, BI (Before Internet) I was at my first weather school in the USAF, at Chanute AFB IL, on a smoke break (remember those?), it was an instructor and a few us students.. we were on a side of the building that faced a sub-station.
There was a small explosion, we felt a very slight disturbance, a teeny tiny shockwave I guess. People started pouring out of the school -- the power had gone out at the school and surrounding buildings. After assessment, we were told "Go home, it'll be hours before it's fixed." A squirrel had gone and shorted out a transformer.. a big transformer, not those little ones you see up on poles. We later heard there was spalling around the transformer. Yea buddy, a squirrel and some metal made for shrapnel!
Second one, in North Miami - our building had only one way in for power, a 3-phase feed off a pole (!), then buried underground (!!) and into the power. Power goes out, but it was only one phase. The boss and I go to where the noise came from.. and there was a dead squirrel on the floor, with charred fur and a blown-out left hindleg. I still have the picture. It took FPL 3 hours to come and replace one fuse on the pole. Our 90 KVA UPS took the phones and network gear through those 3 hours with plenty to spare. No, we had no generator. Just a mondo UPS.