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We do, the limiting factor until now has been making blades strong enough without being extremely heavy but thanks to advancements made for wind turbines tidal turbines are now very viable.
Catch is enviromental impact, how much are you willing to fuck with sea life for power? Right now it looks like the noise only scares sealife within ~200m of a 5mw turbine so it should be not too bad based of early tests.
