That’s the rating at capacity though, which barely ever happens. The ocean current will never stop, so over the course of it’s life the ocean turbine might well beat out a wind turbine (ok, I consider that mildly unlikely, but it’s nice to have power generation that’s less susceptible to suddenly not producing anything).
Also note they say it produced 100kw, not what it was rated for.
Also note they say it produced 100kw, not what it was rated for.