Areas affected by the power blackout:
Much of New York state was without power, including New York City. Mayor Michael Bloomberg said it was likely the blackout started in the Niagara Falls area and quickly spread. Across Manhattan, people poured out of skyscrapers and started trudging home on foot. Traffic lights were out, and subways and buses stopped. New York's three major airports were without power.
Much of northern New Jersey was affected. Train service was canceled and the state emergency management office was activated. There were no reported power problems in the eight southern New Jersey counties covered by Conectiv, the company said.
Power was out across a wide stretch of northern Ohio, from Toledo to Cleveland. Other cities reporting power outages included Akron, Elyria, Mansfield, Sandusky and Tiffin. FirstEnergy spokesman Matt Slagle said the company was getting reports of outages from customers throughout its coverage area in northeast Ohio. The company has 700,000 customers.
Power was out from Detroit to the state capital in Lansing. Detroit Metropolitan Airport remained open with some delays. The outage, closed the Detroit-Windsor Tunnel between the United States and Canada.
Power flickered across Connecticut and some areas of the state lost electric service completely. Northeast Utilities said nearly 58,000 customers were without power. Fairfield County and Connecticut shoreline towns appeared to be the hardest-hit.
The northwestern corner of the state was without power. Power went out to much or all of Erie, Forest and Venango counties, according to emergency management officials.
A handful of northern Vermont towns were hit. A portion of the Northeast Kingdom near Sheldon lost power for about an hour, according to the Central Vermont Public Service, which covers about three-fourths of the state. Some customers in Franklin County including in Highgate and Swanton also lost power briefly.
Blackouts were reported in Toronto, in Ottawa in the province's eastern region, Windsor in the west and North Bay in the northern part of Ontario. The blackout had not spread as far as Thunder Bay in northwestern Ontario, suggesting power in the north was sporadic.