[ericd]

I don’t see how that generates anywhere near enough power, think about the potential energy of a bucket of water going up and down that amount over the course of a day.

[vitally3643]

Sure, but then multiply that by several million buckets. Tidal flows can represent a lot of water volume, way more than you'd expect

[ericd]

Seems way more material/capex intensive than solar/wind? Also, the sea is generally a brutal maintenance nightmare.