On the anniversary of a 1977 blackout that left most of New York City without power, a massive power outage on a hot Saturday night in Manhattan preemptively brought the curtain down on Broadway shows and packed streets with people wielding cellphones as flashlights amid a cacophony of sirens and horns from stalled traffic. No injuries were reported.

Underground, the scene was similarly in disarray as the blackout affecting 73,000 customers for more than three hours hit the subway system. The outage affected the entire subway system, closing four Manhattan stations to the public — Columbus Circle, Rockefeller Center, Hudson Yards and Fifth Avenue at 53rd Street. But Metropolitan Transportation Agency spokesman Maxwell Young said train operators were able to manually change the signals and bring at least one car into stations so passengers could disembark.

Con Edison CEO John McAvoy said a problem at a substation caused the 6:47 p.m. power failure, which stretched 30 blocks from Times Square to 72nd Street and Broadway and spread to Rockefeller Center. Electricity was restored to customers and businesses in midtown Manhattan and the Upper West Side by around midnight, according to a statement from the utility.

The temperature was in the low 80s as the sun set just before 8:30 p.m., treating those who had streamed into the street to one of the city's famed "Manhattanhenge" sunsets. While hot, the temperature didn't reach the highs of Manhattan in July, which often challenges the city's power grid.

For hours before the power flicked back on, doormen stood with flashlights in the darkened entrances of upscale apartment buildings along Central Park West, directing residents up flights of stairs, with all elevators out. Police and deployed troopers directed traffic at intersections, while people in the neighborhood known as Hell's Kitchen took it upon themselves to direct traffic as stoplights and walking signals went dark.

Most Broadway musicals and plays canceled their Saturday evening shows, though some cast members staged impromptu performances in the street.

Jennifer Lopez's concert at Madison Square Garden was cut short in the middle of her fourth song of the night, although officials at Penn Station below used backup generators to keep the lights on. Madison Square Garden, Carnegie Hall and the Lincoln Center for the Performing Arts were all evacuated. Lopez later tweeted that she would reschedule the stop on her "It's My Party" tour for Monday night at the same venue.

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