Especially if the waste heat is used to heat the house and water. Do they make one that also drives the AC compressor directly, since I presume that’s a fair bit more efficient than generating electricity and then using an electric air conditioner?

Of course, if you need a methane infrastructure to power local generators, then geurillas can attack the gas pipes to shut you down. With solar, and even with diesel they have to attack in a lot more places. Places like Iraq need power with no single points of attack. The main point of my blog post, however, was to wonder if that special need might have helped finance a lot of interesting power technologies that are not yet economical otherwise.