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NEW YORK — Thousands of residents in New York and New Jersey woke up without power or air conditioning Wednesday morning as the tri-state region entered the fourth day of a scorching, potentially dangerous heat wave.

Temperatures on Wednesday were again expected to soar into the 90s, with a heat index likely exceeding 100 degrees across the region.

For many residents and businesses, the outages persisted into the afternoon Wednesday.

The mayor urged New York City residents to reduce their power usage in homes and businesses, warning that widespread power failures were possible if people did not do so.

“We have a real challenge on our hands,” de Blasio said during a briefing Wednesday afternoon. “We need to make sure our electric supply is protected.”

Con Edison urged customers across New York City and Westchester to conserve energy as much as possible, in an effort to avoid further outages due to equipment failure.

New York outages

As of 11 p.m. Wednesday, ConEd reported nearly 3,000 customers still without power.

The majority of outages were in Brooklyn, where more than 2,000 customers had no power. Residents with electricity in this area were asked to conserve energy. Hundreds of others in Queens and the Bronx were also without service.

Out on Long Island, PSEG reported around 950 customers affected by power outages.

New Jersey outages

PSE&G New Jersey reported outages affecting over 2,400 customers Wednesday afternoon.

Meanwhile, Jersey Central Power & Light reported just over 3,000 customers without service, a dramatic rise from the afternoon — even after the utility company was able to reduce the number of impacted customers significantly throughout the day before spiking again.