Subway stations plunged into darkness and the billboards of Times Square suddenly flicked off as New York's Manhattan was hit by a power outage last night.

No deaths or injuries were reported due to the blackout, which officials said began at 6.47pm local time and darkened a stretch of the city from West 42nd Street to West72nd Street.

The outage occurred 42 years to the day from a major 1970s blackout that sparked looting and rioting in the United States' most populous city.

"I just flew over the city and most of the lights are back on, that's clear. Not all of the lights are back on, that's also clear," New York state Governor Andrew Cuomo told a news conference about five hours after the outage began. "It is chaotic now on the West Side, certainly."

By midnight, power had been restored to most of the customers who had lost it, said the chief executive of electricity company Con Edison.

More than 73,000 homes and businesses lost power, officials said.

Shouts of celebration could be heard in parts of Manhattan as power was restored, bringing lights and air conditioners back to life.

Sidewalks in Times Square that are usually crowded with tourists on a balmy summer Saturday night were overflowing as Broadway theatres cancelled performances. The lights of nearby Radio City Music Hall were dark.

In an attempt to cheer up customers, the cast of the musical "Come From Away" performed a song in front of the stage door. Other musicals' cast members also staged street-side performances.

With traffic lights out, cars and taxis jammed intersections as emergency vehicles and fire engines with sirens blaring tried to pass. In some places, civilians stepped in to direct traffic, including one who employed a toy light saber.

New York has endured large-scale blackouts before, most recently following Super storm Sandy in 2012 as well as the widespread 2003 blackout across the U.S. Northeast that left most of the city without power for a day.

A New York blackout that crippled the city during a heat wave on 13 July, 1977, sparked rioting and looting. Power was not restored until the next day.