What people figure out to do with actually free energy will be exciting. There are a lot of extremely "inefficient" things that might suddenly become commonplace.
Proto-replicator technology where you dump your garbage into a barrel and it gets decomposed and recomposed into something similar to crude oil, blocks of metal, pure gasses, etc? Hydrocarbon fuel from air? Flying cars? You name it.
To make electric energy I would have to make a small steam plant to run a turbine.
I doubt that it ends up being actually better due to efficiency losses but it’d be really cool!!