Several letters on renewable energy have made the point that wind is not reliable, but then include tidal energy schemes in the same breath.
We have 24-hour tidal energy available around the British coastline.
A large number of (small, simple) machines in suitable positions could produce continuous power several times greater than that intermittently produced by the Severn barrage.
Richard Buchanan
London
Water Sector Talent Exodus Could Cripple The Sector
Maybe if things are essential for the running of a country and we want to pay a fair price we should be running these utilities on a not for profit...