If fusion power ever works it could be a useful base load source to replace coal and fission. But fusion is unlikely to ever be cost competitive with solar and wind, so I expect those sources to be used for synthesizing liquid fuel.

Agreed; this kind of thing seems like a more attractive target for unused peak capacity of renewables. But it only makes sense if the capital costs are low enough that the economics still work even if it's only run part time. Which is a pretty high bar.

We already enjoy the services of a massive optically-coupled fusion energy source. All we need to do it plug it in.