Renewable energy from wind and sun is at the mercy of the elements. Wind turbines stop when the wind drops and solar panels need daylight. But energy from the tides works whatever the weather, and is ultimately driven by the orbit of the moon and its pull on the oceans, which makes tidal energy entirely predictable.
The Outer Hebrides has a wealth of potential renewable energy from strong tides, some of the best in the world, but how can it be tapped? A tidal-powered turbine has recently started to generate electricity in Orkney in what is claimed to be the most powerful tidal generator in the world. It is anchored in a sea channel known as the Fall of Warness, where the Atlantic meets the