My uncle has been trying to go “off the grid” more these days. He actually built his own biogas generator. It was easier than either of us expected. You can collect the flammable biogas in a pretty simple tank. My uncle has been using it to fuel his furnace and cooking stove.
The materials he used were pretty easy to come by. I can’t remember everything, but it included a decent sized clear plastic water bottle, a Mylar helium balloon, plastic funnel, vinyl tubing, and manure pellets.
The tools my uncle used included scissors, a hot glue gun, duct tape, electric drill, and an adjustable wrench. I remember he was happy that he didn’t have to buy any new tools.
It’s great that biogas is renewable because it relies on grass to feed the animals which generate the manure.