PATIALA: The residents of Patiala spent a sleepless night on a hot and humid Saturday. There was virtual black-out as power went off around 9 pm in the whole city. There was no power throughout Saturday night.

When contacted, a senior PSEB official said that power failure was due to a snag developed in 66 KV grid which supplied power to the entire city. However, supply to some parts in the city was diverted through another line. But in most areas power could be resorted till noon on Sunday.

 One of the biggest reasons for the tripping which led to faults in the supply was overburden. A large number of air-conditioners have been installed without permission which added to the burden on the lines," the official added.