When the heatwave hit much of the country on Sunday, power cuts in several states left hundreds of thousands of customers in the dark.
The crews endeavored to restore power after over two days of severe storms disrupting power supply to more than 800,000 homes and businesses in Michigan.
Two utilities said the restoration of power could take until Wednesday.
According to DTE Energy of Detroit, on Sunday afternoon, around 600,000 customers were hit by the thunderstorms in Southeast Michigan on Friday and Friday.
Officials said it was the biggest storm in the area in years.
Their estimate of failures grew throughout the day while the crews were working. The weather brought more than 2,000 cables to a standstill.
The utility company claimed to have restored 250,000 customers and it was expected that all power would be restored by Wednesday.
According to Consumers Energy from Jackson, a total of around 220,000 customers were affected. The utility hoped to restore power to everyone by Tuesday.
The utility said the storms hit more than 2,600 wires.
FLORIDA CHURCH GIVES FULL LOSS AFTER FIRE MONITOR BELONGS TO FLASH. New York City; Westfield, Mass. & # 39; Manchester, N.H .; and Wallops Island, Va.
From the Carolinas to Maine, the daily highs reached the Sunday of the upper 90s. When combined with high humidity, temperatures felt as hot as 110 degrees Fahrenheit in some places.
The New York Police Department warned residents to take it easy]. "Stay inside, there is nothing to see here. Really, we understood that.
In New York City, where after a power outage in Manhattan last weekend before the hot weather, all eyes were on the power grid, the electric company Con Ed reported early Sunday evening around 12,000 scattered failures majority in the districts of Brooklyn and Queens ,
Inmates across the city were affected by these blackouts: 3,700 inmates were out of power at the Brooklyn Detention Complex and Otis Bantum Correctional Center on Rikers Island.
Con Ed asked customers in certain neighborhoods in southeastern Brooklyn, "to save energy while the company's crews are working on troubleshooting equipment issues". The utility company also claimed to have lowered the voltage in these areas by 8 percent to maintain service during the repair THE FOX NEWS APP
The city instructed office buildings to discontinue thermostats of at least 78 degrees by Sunday, to reduce the load on the power grid. The day before, a commemoration of Times Square's planned moon landing in 1969 and an open-air festival with football star Megan Rapinoe and musician John Legend were mingled with the heat.
Jacqui Heinrich and The Associated Press of Fox News contributed to this report.