Residents have relied on open ovens, boiling water, layered clothes and donated blankets to stay warm.
LIPA crews dried out the substation responsible for powering The Rockaways, but power could take time.
All of the boroughs are now connected by subway service.
Dia de los Muertos celebrations across the city must wait until power and transit is restored.
Customers in Lower Manhattan, however, were still waiting for electricity Friday morning.
Power is slowly starting to come back across New York City.
ConEd began restoring power in the city, but it will take a few more days to turn the lights back on.
The massive storm, which killed 18, brought power outages, raging fires and historic floods.
Con Ed had announced it would allow workers to return to their posts before a storm slams New York.
The power cuts have been restored to some Brooklyn neighborhoods, a Con Ed spokeswoman said.
Anti-nuclear activists are set to rally on the Hudson River to raise awareness about the danger of New York State's nuclear plants, including Indian Point.
The eco-friendly festival Ecofest has been rescheduled for this coming weekend, but may not be powered by renewable energy.
Uprooted trees, broken branches, minor floods, faulty traffic lights and cordoned off streets were seen across Manhattan.
Con Ed ended its voltage reduction for the UWS Sunday, which it instituted Friday night because of equipment problems.
Once the installation is complete, Bryant Park will no longer need generators to power events, including its winter ice rink.
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