Dear Rubrick: "This sandbank experiences no winds under 60mph " Have you by any chance overstated the wind velocity? (what part of the time are such velocities observed?)

As for tidal power, I have read about some French use of it, but not for a long time
Many years ago there was a proposal to construct tidal dam from Maine to Nova Scotia, but that must have been a pipedream. Imagine the headaches.Worse than Chinese Three Gorges project.