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The Midwest Independent Transmission System Operator (MISO) declared an emergency alert due to high temperatures stretching generators to a much higher-than-forecast load.

The agency reported demand surged to its highest point ever in history Wednesday, peaking at 103,975 megawatts and surpassing the last record set on July 31, 2006. Previously in May, the agency said it expected peak demand for the summer to reach 93,842 megawatts, a projected 1.3% increase over 2010.

Full Story: http://edition.cnn.com/2011/US/07/21/heat.wave.power.demand/index.html