Lego acknowledges the impact of its operations on the environment, in particular in areas such as climate change, resource and energy use and waste. All manufacturing sites are certified according to the environmental standard ISO 14001. The first Borkum Riffgrund 1 wind turbines off the coast of Germany began producing electricity in February 2015, which will help The Lego Group reach its goal of being based 100% on renewable energy by 2020. The company claims to recycle 90% of its waste and that it had made its operations nearly one-third more energy efficient over the five-year period ending 31 December 2013. It is seeking alternatives to crude oil as the raw material for its bricks. This results in the establishment in June 2015 the Lego Sustainable Materials Centre, which is expected to recruit more than 100 employees, as a significant step towards the 2030 ambition of finding and implementing sustainable alternatives to current materials.