Construction work starts today [Monday 9 Oct. 2006] on Europe's biggest onshore wind farm. The £300 million Whitelee site, south of Glasgow, will have 140 turbines eventually to provide electricity to power 200,000 homes.320 Megawatts of power will be generated.
On a related note, Shell estimated that the market of renewable and "clean" energy would amount to about £30 billion. (That's just over $56 billion.) This is a very rough estimate, but even if it is off by an order of magnitude it is substantial.