While City Hall demands answers from Con Edison following the summer’s blackouts, residents of a Bronx public housing complex have spent the last month depending on generators to keep their lights on.

Officials at the city’s embattled Housing Authority could not provide a timeline Wednesday for how long it would take to repair the electrical systems at the Jackson Houses in Mott Haven, which were crippled by a July 10 transformer fire.

“It’s been like rocky, it’s been up and down, elevator service is constantly interrupted,” said Danny Barber, the president of NYCHA’s citywide tenant association, who lives in the complex.

“People stuck outside, people sleep in their cars – and that was when we were having the heat waves.”

More than 2,300 other New Yorkers call the development’s seven, 16-story apartment towers home — six of the giant buildings are running on backup electricity.

Barber told The Post the system is struggling to keep up with demand, describing scenes where lights flicker before power outages, struggling air conditioners can’t keep up with the heat and the complex’s elevators — a lifeline for those who live on higher floors — are on the fritz.

“It’s been grueling. It’s been hard. It’s been bad,” added Barber, who lives on the 15th story of one of the buildings. “If you’ve got no power, you’ve got no water and you’ve got no light. You’re living in third-world conditions.”

The situation has forced 32-year-old mother Jessica M. to sleep in her car with her son, who suffers from sleep apnea.

“The whole summer it’s been a nightmare,” the medical assistant said. “The power goes off and we go into my gray Camry at 10 or 11 [p.m.], and turn on the AC.”

She added: “This building’s problem is the power. My son is overweight so he can’t be outside so we go to the car. It’s so hard living in here.”

However, other residents said Wednesday that the generators were just another in a slew of headaches they contend with on a daily basis.

Water will go off for two-three hours every other week,” said Tye McCutheon, 25. “I keep an emergency kit with a flashlight, food, batteries and gallons water. What can you do?”

Barber told The Post this is the “fifth or sixth summer” where electrical problems have forced the Jackson Houses onto generators.

In a statement, NYCHA said it is laboring to repair the basement where the transformer burned and replace the busted gear but could not provide an estimate for when the work would be done.

Additionally, it said that it’s upgrading the complex’s aged electrical system to get rid of transformers all together — a project that is expected to take at least another year.

“NYCHA is closely monitoring the situation at Jackson Houses to ensure residents have consistent electrical service as we completely update the development’s electrical system,” said NYCHA spokesman Chester Soria.