Biogas: viable or not?
Because Zonca is situated at around 700 – 850 meters supplies need to be brought in, either using cable lifts or by car (weather permitting). A few people still use gas bottles to cook with. Unfortunately propane, butane and LPG are products of the oil industry.
While methane is implicated in global warming, the ability to produce your own biogas (which is methane) without needing the giant infrastructure of the oil industry and without having to transport heavy gas tanks seems like a huge benefit.
Small scale production of biogas is one possibility. This website offers a very cheap setup that currently costs ± $520.-