@Tarbh @bobjmsn no, this isn't strictly true. Nuclear energy is far from carbon neutral. Nuclear power stations are built with large amounts of concrete, which is hugely carbon intensive; the mining of uranium is also hugely power intensive.
Two out of phase tidal arrays can produce the same amount of continuous, weather independent power as a nuclear plant, at vastly less cost. Of course, there are nations without two good tidal sites which are out of phase, but Scotland is not one of them.