In Portugal there's a beach (São Torpes beach) famous because the water gets heated by the coal powerplant next to it, this water is the one that cools down the water that passed through the turbines.<br>The water that's used to turn the turbines is in a closed circuit, the water that's this circuit then passes through a section where ocean water cools it and then the now heated ocean water is pumped out to the ocean again close to a beach. Since the ocean water never mixes with the turbine water, and such turbine water never gets directly exposed to the coal gases it is safe to seem in that beach (or at least it should assuming there is no leaking in the pipes there shouldn't be)