@awesomeaustinv Nova Scotia just completed a pilot project to test the usefulness of them here off the coast of the Bay of Fundy.
We have the world's highest tides there (not where I live in NS though, just the Bay of Fundy) and those tides change from low tide to high over the course of like 6 hours...something like 10ft to 50ft. Pretty crazy to relax near a wharf or river there for a few hours when it's happening and seeing the waterline change...I remember camping near a river there when I was a kid and watching fishing boats be beached on a completely dry bottom when I went to bed and be floating 'up' at the wharf above when i woke up, lol.
Because of the crazy tides, the potential for tidal energy here is MASSIVE...the tidal currents move at something like 5 meters a second in places! Apparently the pilot project just ended and several Japanese companies have agreed to participate on constructing and implementing the new turbines.