For long Mumbai has been the envy of most of the other metros in India. Even if the rest of India went dark after a grid collapse, like the one in 2012, the country's financial capital had an 'islanding system' that allowed it to isolate itself and ensure continued power supply.
Though the 2012 blackout didn’t spread to Maharashtra, Mumbaikkars would proudly say that they would have been unaffected even if it did.
In the morning of October 12, however, the opposite seemed to have happened. Just as Mumbai was gearing up for the first day of the week, large parts of it went out of power.
“At 10.10 am there were simultaneous substation tripping in MSETCL's Kalwa, Kharghar causing a huge dip in frequency in the Mumbai transmission system which led to tripping of Mumbai power supply," Tata Power said in a statement.