While seemingly off-topic, there is a lot of information here if you use all the links within links:
Everything from NBC warfare to storms & quakes can be accounted for there.
Funny you should mention power-- I'm in the middle of building a 10,000 watt standby generator for hurricane season here. My wife- the lovely Emily- simply refuses to evacuate ( for a variety of fairly sensible reasons ) and this old house is almost unfit for habitation without some electric power, so I'm rebuilding and old, defunct welder chassis with a new generator head. One criteria for a plant is that has to be easy starting ( electric start ) and simple to use, which the welder's engine end was when it was in service.
And naturally, like any home manufacturing project, everything is running behind schedule- wrong parts shipped, parts missing, the lathe I use for turning down the old armature shaft died two days ago, and I just got it swung out enough from the shop's back wall to gain access to the electric panel, where I think ( hope! ) the fault lies. I do have a much smaller metal lathe that- in a pinch- can turn the shaft, one tiny pass at a time.
Once that is done, a keyway is cut in the shaft, a subchassis of angle iron welded to hold engine & generator, the rotating assemblies mated via a flexible coupling, another subchassis for the generator welded up and joined to the engine subchassis- then we test her and see if we have a practical powerplant.