Toronto Hydro has issued a description of a broad perimeter for tonight’s unexpected and remarkably unexplained power outage. Hydro says there is limited service in an area bounded on the east by Yonge Street, on the west by the Mississauga boundary (Etobicoke Creek) on the north by Lawrence Ave. West and on the south by Dupont Street. Hydro says the trouble lies with a “Hydro One transmission problem”