RE: Just a few thoughts /questions26 Sep 2022 13:52
Its the Pentland Firth, water is channelled through this narrow gap between Orkney and the top of Scotland, powered by the Moon orbiting the Earth. The Gulf stream is a massive conveyor belt in the Atlantic powered by temperature variations, put simply. I suspect that the Gulf Stream is too diffuse to harvest energy from with turbines, plus its in much deeper water. The increasing amount of fresh meltwater from the Greenland ice sheet puts the Gulf Stream at risk which could make Europe a lot cooler.
Taking energy out of tidal streams such as the Pentland Firth will increase the rate that the Moon is getting further away from the Earth in its orbit. But this will be negligible, given the size of the Earth and Moon. If the turbines are placed correctly (the same as with wind) then they shouldn't impact each other.