Guardian: In the desert of southern Spain, 20 miles outside Seville, more than 1,000 mirrors are being carefully positioned. Each is about half the size of a tennis court, so the adjustments will take time. But when they are complete in a few weeks, it will mark a major moment in the quest for renewable energy. The mirrors are part of the world’s biggest solar tower plant, a technology that reflects sunlight to superheat water at a central tower. Once this 80m (£67m) plant is inaugurated in …