The city of London, the historic “square mile”, the central area of London, will soon switch to clean energy in a big way. Starting in October 2018, the city of London will source 100% of its power needs from renewable energy sources by installing solar panels on local buildings, Investing in larger solar and wind projects and purchasing clean energy. Though no longer a square mile, now closer to 1.12 square miles, the city of London is a major financial center within the city and the world. It's green energy transformation send a clear message that London intends to take strong action against climate change.