More than 68,000 homes and businesses remained without power in New Jersey, Connecticut, New York and Pennsylvania as late Saturday, according to outage tracker PowerOutage.com. That is down from more than 119,000 customers earlier in the day.
New York had more than 31,000 without power, while Connecticut and New Jersey each had more than 12,000.
PSEG Long Island said the severe weather was affecting 13,212 electricity customers across Long Island and the Rockaways, adding that the storm brought down trees, branches and wires.
The company said it has already restored power to more than 45,100 customers affected by the storm since Friday.
Central Hudson Gas & Electric Corporation in New York state said crews were working to restore power to more than 19,000 homes and businesses, with the hardest-hit areas in parts of Ulster County. The utility expects restoration efforts to continue into Sunday.
NJ.com reported floods in areas of New Jersey from Bergen County in the north down to Cape May County at the state's southern tip, with voluntary evacuations in some Jersey Shore communities. MetLife Stadium in East Rutherford announced that rock band AC/DC's concert on Friday was postponed until October 2.
In Long Island and New Jersey, some people kayaked down flooded streets.
Flight tracker FlightAware said 439 flights involving US airports have been cancelled and 2459 flights were delayed.
The US National Weather Service said the strong nor'easter will bring coastal flooding, rip currents, strong wind gusts, and heavy rain to the Mid-Atlantic and New England regions through to Monday.
There will be "a lot of high winds, a lot of high tides and heavy rain possibility over the next few days for the northeastern US," said Bob Oravec, lead forecaster with the National Weather Service in College Park, Maryland.
Nor'easters are not unusual as New England moves into autumn, but "this might be a little earlier than average for a big storm," Oravec said.
The governors of New York and New Jersey on Friday declared states of emergency in counties expected to see the worst of the storm, including New York City. Connecticut's governor activated the state's Emergency Operations Centre.
with AP