Salon.com's most excellent "How the world works" gives us a number in the third sentence that is worth remembering-50,270
At 1:30 p.m. on Thursday, California's total demand for electricity registered 46,396 megawatts. The California Independent System Operator, California's electricity grid manager, was predicting that peak demand would hit 49,105 megawatts, which would be shouting distance from the all-time high of 50,270 registered July 24, 2006....
Total British wind generation capacity?
The Braes of Doune project in Stirlingshire pushes the UK's total wind capacity past 2,000MW for the first time.
U.S. installed (theoretical) capacity?
12,634 MW as of June 30, 2007