Large parts of Mumbai, Thane, Raigad, and Palghar witnessed a major power cut on Monday morning due to grid failure. As per Maharashtra Energy Minister Nitin Raut, some regular maintenance work was going on at the 400KV lines at Kalwa, Thane. “All the load had been shifted to the other circuit, which faced some technical issues and broke down, hitting power supply to large parts of Mumbai-Thane. Work is underway on a war-footing to restore power,” said Raut in a statement.
Within almost 15 minutes of the fault, ‘#powercut’ started trending on Twitter. Traffic signals on the roads stopped working, water supply schedules were hit, lifts got stuck in some buildings. The lifelines of Mumbai, i.e. Central Railway and Western Railway, were hit too. Commuters, who were stranded due to sudden electricity failure, jumped down at many locations and began walking down to the nearest suburban railway station.
Tata Power has issued a fresh statement on the Mumbai power outage: “Based on the preliminary assessment of the situation, Tata Power would like to inform that today many parts of Mumbai experienced an unforeseen electricity failure starting at 10 am in the morning due to tripping of MSETCL’s 400 KV transmission system at Kalwa which supplies to Mumbai and adjoining areas. MSETCLs 400kV Pune-Kalwa line was under forced shutdown since yesterday due to R-Y phase fault. It is understood that MSETCL had taken emergency shutdown for 400 KV Kalwa-Padghe line-1 at 6.54 hrs today morning to attend fault and was expected to be revived by 09:30 hrs, but could not revive it. As understood, at 09:58 hrs 400kV Kalwa-Padghe-2 carrying 633 MW tripped. The flow-on Pune-Kharghar rose up to 900MW and tripped at 10:00 hrs resulting in a load drop in the Mumbai system. “Mumbai’s islanding system that saves the city from major power outages was separated, however, it could not hold as additional 900MW load dropped at 10:05 hrs. Tata Power swiftly began restoration work to bring back supply from the 3 Hydro units and Trombay gas and coal units as soon as the MSETCL transmission lines were connected. Tata Power started restoring supply to its consumers progressively from 12 noon onwards. Tata Power regrets the inconvenience caused to its consumers due to this unforeseen event in power failure due to the transmission system failure leading to the cascading impact to all downstream suppliers of electricity including Tata Power, BEST, and its consumers.” However, things have begun going back to normal.
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