Electrochemical generation of cellulosic ethanol.

https://en.wikipedia.org/wiki/Cellulosic_ethanol

Celluosic ethanol is a real thing, but currently uneconomical because yield is not worth the energy inputs. But you could have something like a biofermenter for your people in which excess solar or wind is plowed into hydrolysis of cellulose, generating ethanol electrochemically.

They could call it the still, and the product "moonshine". It would be flavored by whatever feedstock they used to produce it.

The moonshine they make (out of hay and leaves) is used like propane for a generator and also directly to power vehicles.

This is chosen because it is not from our world, but neither it is bizarre science fiction - a near future or close parallel dimension technology appropriate for wealthy people in the country.

Electrochemical generation of cellulosic ethanol.

https://en.wikipedia.org/wiki/Cellulosic_ethanol

Celluosic ethanol is a real thing, but currently uneconomical because yield is not worth the energy inputs. But in your fiction you could have something like a biofermenter for your people in which excess solar or wind is plowed into hydrolysis of cellulose, generating ethanol electrochemically.

They could call it the still, and the product "moonshine". It would be flavored by whatever feedstock they used to produce it.

The moonshine they make (out of hay and leaves) is used like propane for a generator and also directly to power vehicles.

This is chosen because it is not from our world, but neither it is bizarre science fiction - a near future or close parallel dimension technology appropriate for wealthy people in the country.