Energy Minister Raut had on Monday said that power outage in the city on October 12 last year was a "cyber-attack and a sabotage".
The NYT report also claims that Indian authorities were alerted about the increase in deployment of malware and given technical details.
On October 12, a grid failure in Mumbai resulted in a massive power outage, stopping trains on tracks, hampering those working from home amidst the COVID-19 pandemic.
Nitin Raut said the power breakdown in the metropolis and neighbouring Thane and Navi Mumbai on Monday was not a small issue.
Railway services across city on the Western Railway and Central Railway came to a grinding halt at 1005 hrs as a result of the power outage.
State Energy Minister Nitin Raut also said the reasons behind the technical snag that caused power failure in parts of the MMR will be probed once the electricity supply is restored.
Trains came to a halt and other activity was also grounded due to what was labelled as a grid failure by officials.
Large parts of the financial capital reported a major power outage on Monday morning due to a technical failure.