Our part of min-Michigan has a huge number of electric power districts out. Ice and falling trees is taking down poles, and causing transformer burnouts. We have power, but about a 1/8 mile away is a high-end subdivision/neighborhood, each with it's now running standby generator. You can easily pick up the drone sound from the common rpm between all these units. I could sleep thru this, but frequently there are loud thumping noises coming from there. I'm guessing that this is 'FM-ing' (Frequency Modulation) cause by individual generators catching up on a load from motors starting, wells running, etc. It's currently 21 deg F here, so furnaces are definitely running. What do you think is going on? Otherwise it sounds like the 'katerpillar drive' going bad on the Red October.