Australian: AUSTRALIA could be home to the world’s largest solar energy plant in three years, with a study backed by major miners under way to build a series of $1 billion renewable energy operations. Global engineering company WorleyParsons is leading the way for nine of its clients, which include BHP Billiton and Rio Tinto, to investigate building 250 megawatt advanced solar-thermal power stations, with predictions the first could be operating by 2011. WorleyParsons managing director, …