Electricity pylons carry high voltage power lines across a field of rapeseed in Hampshire, U.K., on Wednesday, May 19, 2010. Electricity use may have peaked today at 45,030 megawatts, reducing the cushion of spare capacity available to the network to 7,466 megawatts, according to data from National Grid Plc. Photographer: Rupert Hartley/Bloomberg via Getty Images
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