DETROIT -

DTE Energy is working to restore power that went out Wednesday to several downtown Detroit buildings.

A spokesman for the energy company said power was brought back Thursday to the Renaissance Center, 150 West Jefferson. But the Courtyard Marriot and the Millender Center are still running on generators.

DTE said a cable failure is to blame for cutting the power and leaving dozens of people in a dangerous situation at the buildings. Detroit firefighters rescued people from failed elevators. Some needed help walking down flights of stairs.

"We had people on the 15th, 20th and 22nd floor requiring some form of assistance getting out of the building," said Lt. Jason Sablowski, of the Detroit Fire Department.

A few people even had to be carried out.

"They're all tired -- EMS personnel and firefighters are tired," said Sablowski. "Twenty-two stories up, 22 stories down and we have some crews making two trips, so when they came out they were sweating."

Residents say they were in the same situation just a few days ago.

"It's the second time, and it's annoying at this point," said Vadin Auvshalumov, who lives in the Millender Center Apartments. "You would think last time they would fix the issues ... that's the most frustrating thing."

Some businesses were open while running generators for power. DTE had supplied some businesses with backup power, too.

DTE offers this outage map to help customers stay on top of outages.

The green triangle represents between 100 and 150 DTE customers without power in downtown Detroit, according to the energy company's interactive map.