Telegraph: The development of 250 turbines, each up to 540ft tall, will provide enough energy to power half a million homes. It is the latest in a drive to see the UK source a fifth of its energy needs from the new technology. However the local community fear the turbines, visible from the coast, will destroy the local tourism industry. And energy analysts warned the controversial technology will only provide intermittent power. The Gwynt y Mor wind farm, that will start …