Substation No. 505 in Oak Park, with its nondescript cluster of bulky transformers and web of power lines, seems an unlikely place for Commonwealth Edison to start the $2.6 billion smart grid it says will prepare the region’s antiquated power system for the digital age. Arguments raged over legislation, approved last year over Gov. Pat Quinn’s veto, that authorizes ComEd’s 10-year investment in the grid...

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