Eventuallly energy will become so inexpensive that trade and commerce as we think of it, is like comparing trade and commerce of 50, 100 or 200 years ago, completely changed tech. So it is likely to be a different system than owners and workers. One solution is everyone gets a share in X portfolio of their choosing, then they are the owners and can get the UBI or own shares in the company(ies) they think will be profitable. If you can’t manage equities, you get a lower UBI to get some soap and raman noodles and a tent.