Storm leaves 186,000 in dark, shuts Buckeye pipeline in Pennsylvania

July 9 (Reuters) - About 186,000 homes and businesses in the U.S. Mid-Atlantic states remained without power on Wednesday after severe thunderstorms rolled through the region overnight. Buckeye Partners LP, a U.S. petroleum pipeline operator, said in a notice to shippers that its Laurel refined products pipeline from Boothwyn, Pennsylvania, near Philadelphia, was shut due to a power failure. Exelon Corp's PECO utility in the metropolitan Philadelphia area said it had over 54,000 custome