Watch the mayor’s reaction above to the Con Ed outages in Brooklyn Monday morning.

New York City Mayor Bill de Blasio says he’s “disappointed” with Con Edison as at least 17,000 customers across the city remain without power Monday.

During a news conference Monday morning, de Blasio said Con Ed knew it was dealing with an unprecedented situation as this past weekend’s heat wave approached, and called for a full investigation into the mass outages Sunday, primarily in Brooklyn and Queens.

“They’re not doing their job,” de Blasio said Monday of Con Ed’s response to two major outages in the past month.

According to Con Ed, 12,724 customers across the five boroughs and Westchester are still dealing with outages as of 8:10 p.m. Monday. That’s more customers dealing with outages than earlier Monday evening, but it is a significant decrease from the 52,000 customers who were without power during the peak of outages Sunday night.

Residents can check the latest updates on outages on Con Ed’s interactive outage map.

Most of the outages are still in Brooklyn, where Con Ed purposely took over 30,000 customers temporarily off power Sunday night to do repairs for those with outages before that, as well as avoid a larger outage, officials said.

Sunday’s initial outages were heat-related, a Con Ed spokesperson confirmed.

“The accumulated heat and strain from the past few days has built up in the electrical equipment,” Mayor Bill de Blasio said Sunday.

As of 10:45 a.m. Monday, nearly 14,300 customers are still without power in Brooklyn, down from the more than 35,000 in the borough Sunday night.

Con Ed took 30,000 customers in parts of Carnarsie, Mill Basin and Flatbush temporarily off power so that it can make repairs for the thousands dealing with outages, de Blasio said.

Elsewhere across the city, Con Ed says over 2,500 customers are without power as of 10:45 a.m., down from around 14,000 customers with outages there Sunday night.

Con Ed customers with outages in Manhattan are down to 226 as of 10:45 a.m.

There are 158 customers with outages in the Bronx as of 10:45 a.m., according to Con Ed. Nearly 2,000 customers were experiencing outages Sunday.

By early Monday just about all Con Ed customers in Westchester County had power restored, after about 4,100 customers were without power Sunday night. Customers in Staten Island have also had power restored by early Monday, after more than 1,000 customers experienced outages Sunday.

Sunday night, Con Ed asked customers in Sunnyside, Woodside Flatbush, Prospect Park Lefferts Gardens, Prospect Heights, Canarsie, Flatlands, Old Mill Basin, Bergen Beach, Georgetown, Bronx River, Bruckner, Castle Hill, City Island, Clasons Point, Co-Op City, Country Club, Eastchester Bay, Edgewater Park, Harding Park, Middletown, Parkchester, and Pelham Bay. Also, Schuylerville, Soundview, Spencer Estates, Throggs Neck, Unionport, Westchester Square and West Farms to conserve energy.

People in the neighborhoods listed have been told not to use energy-intensive appliances such as washers, dryers, microwaves and, if not needed for health or medical reasons, air conditioners.

There's also an 8% voltage reduction in the areas impacted because of an equipment problem.

This isn't the first outage of the heat wave. New Yorkers dealt with one earlier in the weekend.

If you have lost power, draw down your shades to keep the temperature down.

To find a cooling center near you, click here.