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Who: Exelon

Who: Exelon

What: Photovoltaic solar plant

Half the states in the U.S. require utilities to generate a certain percentage of power from renewable sources, helping to fuel rapid growth in wind and solar power. Exelon is working with SunPower to put a solar photovoltaic plant on an old brownfield site on Chicago's South Side. The 10-megawatt plant will have 32,000 solar panels and should be able to power between 1,200 and 1,500 homes.