[tastyfreeze]

Nice! Synthesizing fuel is something I think about whenever I study power generation. Ideally, the synthesized fuel doesn't require cryogenic storage to store large quantities. The less energy that storage requires the better for fuel ubiquity. I dream of a fuel generating device that is utilized to dump excess generated power. Currently off grid power generation dumps load as heat. The heat is often used to heat water or a room but occasionally dumped in atmosphere.

Methane synthesis is the first step in a whole chain of high energy synthesis. The two most important economically are longer hydrocarbons (ethane, propane) and ethylene which is the base for poly-ethylene plastics.

But, for synthesis the electricity has to be essentially free to be economical. These chemical pathways require a lot of energy. I would probably use methanogens to create methane from organic waste then use excess electricity for higher order synthesis.