Number of wind turbines to quadruple under Renewable Energy Strategy The Government’s plans are likely to include more than 4,000 additional onshore turbines by 2020, many built at beauty spots and on high ground which would make them visible across miles of open countryside. Another 3,000 turbines would be installed at sea.. Two a day, everyday, for ten years….Ministers will claim on Wednesday that 250,000 “green” jobs could be created as Britain increases renewable energy from 2 per cent to