In September, the UK opened the world's biggest offshore windfarm at Thanet, off the coast of Kent. The eight lines of turbines, running north-west to south-east, cover a total area of 35sq km off Foreness Point near Margate. With 100 turbines, each 115 metres high with 44-metre blades, it can generate 300 megawatts (MW) of power – enough for 200,000 homes