Utility titan Exelon announced it is investing nearly $5 billion in a five-year plan to switch to clean energy products. The project, set to last through 2015, is part of a large initiative called Exelon 2020, which revolves around “reducing, offsetting or displacing” more than 15 million metric tons of emissions by 2020. The target figure represents the size of the company’s greenhouse gas inve
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