India, May 23 -- A major blackout hit Gurugram on Friday night after a fire broke out at the 220kV power substation in Sector-72, said Haryana Vidyut Prasaran Nigam Limited (HVPNL) officials.

The outage which affected Sectors 15, 18, and 38 to 57, also halted the rapid metro mid-journey, forcing passengers to get off and walk along the tracks to the nearest station. It was expected to take several hours to bring the substation back online, officials said.

The substation, which powers half the city, is a lifeline of the power supply infrastructure of Gurugram with seven more substations drawing electricity from it.

Kushal Kumar Sarkar, HVPNL superintendent engineer, Gurugram, said extreme heat caused the current transformer of one of th...