Europe's renewable energy revolution

A tunnel under construction beneath a Norwegian mountain is just one link in a new grid that will cross national bordersMore than 2km down a dark tunnel deep inside a Norwegian mountain, a drilling machine is boring out holes in the rock. It’s part of a major project that will connect Britain to Norway’s huge hydroelectric power supplies, passing power lines through the mountain near Kvilldal, southwest Norway, before laying the world’s longest undersea power cable, 450km long,