Also Read: Most Parts Of Mumbai Face Major Power Outage After Grid Failure In Thane's Kalwa
The outage, according to the city's electricity supply board, is because of the "TATAs incoming electric supply failure". Traffic signals at some areas too have stopped working.
Western Railways also said the breakdown is due to a grid failure at Tata Power.
The reason behind grid failure is overpowering of circuit 2. Maintenance work was ongoing at circuit 1 due to which circuit 2 had to take the overload and it tripped leading to a collapse of infrastructural services like trains, traffic signals and other power dependent activities.
Maharashtra energy Minister Nitin Raut said that due to a technical glitch in Circuit 2 of the Kalva-Padghe powerhouse, the regions between Thane and Mumbai are facing a power cut. "Our staff is working on it and power will be restored in an hour or 45 minutes," he said.
The BMC has also stated that "it will take 45 minutes to 1 hour to restore the power supply."
Andheri, Bandra, Kandivali, Mulund, Vashi and Thane, were among many areas of Mumbai Metropolitan Region which were affected by the massive power outage.