The London Array — the world's largest offshore wind farm — started operating on April 8, 2013, about 20km off the coast of Kent and Essex, England. Looking at these pictures taken from space gives you a perfect idea of the Array's amazingly vast extension.
It has a maximum generating power of 630MW, enough to supply up to 500,000 homes. This is how it looks like from sea level:
Photo: London Array
So what does it look like from space? NASA Earth Observatory posted this amazing satellite photo of the area today:
NASA Earth Observatory image by Jesse Allen and Robert Simmon, using Landsat data from the US Geological Survey.