 WARRENVILLE, Ill.--BUSINESS WIRE--At a time when the nations energy grid is increasingly challenged by extreme heat and storms, the four nuclear plants serving Chicago and northern Illinois are approaching a combined 41 years, or 15,000 consecutive days, of continuous service. The Dresden, Byron, Braidwood and LaSalle nuclear plants located outside the Chicago region provide more than two-thirds of the states carbon-free energy and are the only clean-energy resources that can operate around 