I have a fireplace at home. Perhaps I might want to go seek some wood for it. Everything will be fine though, unless there are widespread blackouts, which I doubt (Switzerland’s electric energy balance is sane enough).
Most of the heat from a fireplace goes right up the chimney. I don't know what your options are in Switzerland, but a wood stove or a fireplace insert might be worth looking at. If you have a supply of wood, of course.