After hours of blackout due to a breakdown of the Northern Grid early on Monday, power supply was completely restored, a top official said.
"We have completely restored the Northern Grid," says PowerGrid Corp CMD RN Nayak.
A failure in the Northern Grid at 2.32am affected supply to seven northern states, including Delhi. Officials said the failure took place somewhere near Agra, causing the entire system to trip.
Power supply was also hit in Punjab, Haryana, Himachal Pradesh, Uttar Pradesh, Rajasthan, and Jammu and Kashmir.
Train services on the 190-km Metro network weaving through the length and breath of the national capital were affected due to the failure of the Northern Grid.
However, all Delhi Metro services could be restored only after two hours around 8.45am. No Metro train ran from 6am, when the services normally begin, till 7am. Only 25% of the services were restored by 7am.
Northern Railways, Delhi Metro and other vital services such as water treatment plants were affected.
The power outage led to an acute water problem across Delhi with taps running dry.
Power failure put the traffic signals on a blink, causing massive traffic jams during peak office hours.
VV. Sharma, general manager of Power System Operation Corporation Limited (PSOCL), said a three-member committee has been appointed to look into the reasons of the power failure, and details would be given once the committee gives its report.
"The trouble resulted in power outage in the entire northern region, but for parts of Badarpur in south Delhi, Narora and Simbhauli in Uttar Pradesh and Bhinma in Rajasthan," a statement from PSOCL said.
According to a Northern Railway spokesperson, nearly 100 trains were disrupted but traffic was back to normal by 8am. Around 45 local trains in Delhi were also affected.
"Power supply has resumed, but several trains are plying four-five hours late. We are holding back goods trains and giving priority to passenger trains," the spokesperson said.
"Vital services and VIP areas were first provided power, and most of the services have now been restored," a BSES official told IANS.Delhi's Indira Gandhi International Airport functioned normally with the help of generators.
A caricature of the Union power minister!