Pubs, shops and businesses in Ashton town centre were forced to evacuate when they lost their power at just before 6.30pm on Thursday.
The power cut also caused chaos on the roads as traffic lights stopped working.
Around 1,300 homes and businesses were affected.

United Utilities confirmed the loss of power was caused by a group of youths who had been climbing trees and throwing bike chains at the power cables in Allscott Way, Ashton.

A company spokesman said: "The youths had been climbing trees and threw a bike chain over the overhead leads.
"They were using the bike chain to pull the cables together, so when the conductor came into contact with the metal, it caused a spark to happen.

"As a result, they caused power to go off in the area.
"It was restored within 35 minutes.
"This sort of reckless behaviour inconveniences customers and puts themselves at risk.

"We would urge them to think of the consequences – they need to think about what they are doing as they might not be so lucky next time. They could cause themselves serious injury – or even worse.
"We have to look at ways to deter people from doing things like this in the future.

"If people see this sort of action they should give us a call on 0800 195 4141 and let us know what is happening."