Wave power

The world's first commercial-scale wave-power station has gone live off the coast of Portugal. This footage shows how the 140m-long snake-like devices work.

From a distance, they look like nothing more than thin red lines on the horizon, easily lost amid the tumbling blue of the Atlantic Ocean. But get closer and the significance of the 140m-long tubes, 10 years in the making by a British company and now floating in the sea off the coast of Portugal, becomes apparent: they are the beginning of an entirely new industry in the hunt for clean power.