Wind turbines sit in the North Sea at the London Array offshore wind farm, a partnership between Dong Energy A/S, E.ON AG and Abu Dhabi-based Masdar, in the Thames Estuary, U.K., on Tuesday, Oct. 27, 2015. The London Array, east of London, has 175 Siemens turbines and a capacity of 630MW. Photographer: Simon Dawson/Bloomberg via Getty Images
