CHICAGO--(BUSINESS WIRE)--ComEd today announced that its power system reliability in 2014 was the company’s second best on record, second only to the company’s 2013 performance, which was the best in company history with the fewest customer interruptions. The strength of the electrical system has benefited hundreds of thousands of residents and businesses throughout northern Illinois. The expansion of the Smart Grid, infrastructure upgrades, including storm response enhancements, and committed