Con Edison admitted to "late-night chainsawing" near the construction site of a new high-rise.
The suspects allegedly took wire from the inside of a Con Edison truck on Roosevelt Avenue.
Temperatures are expected to get up to 97 degrees but will feel like 103 degrees, forecasters warn.
Temporary power outages may affect Stuy Town as Con Ed repairs equipment, officials said.
New Yorkers used a record amount of electricity Sunday, though temperature records were not broken.
A voltage reduction for East Shore residents ended on Sunday night.
Con Edison was asking customers in certain Brooklyn neighborhoods to conserve energy Tuesday evening.
A truck crashed into a tree, taking down several power lines, officials said.
The project, estimated to take four years, is slated to start sometime before the end of 2013.
Con Ed said that approximately 4,000 were without power in West Brighton on Tuesday afternoon.
The lights will be turned off if the debt-ridden club can't pay its Con Ed bill, sources said.
A power outage early Monday left about 1,200 guests without electricity or water at the New York Palace.
Some residents spent the weekend weathering chilly temperatures at the iconic inn.
Officials from Con Ed said signficant repairs needed to be made to the building's gas system.
An electrical fire broke out in the basement of a residential tower in Midtown on Friday morning.
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