Practical Wave power is something of a Holy Grail in alternative energy. Friction, biofouling and corrosion have defeated every champion so far.

But storage is a Hard Problem, too, especially at scale. An old colleague is now working with flywheel storage, which is very exciting, but not something I'd try to use at sea!

Wave power is not locked to daylight hours, even very marginally-economic wave generation could be attractive for a seastead even if nowhere else.