"This tripping has resulted in load reduction of Parel, Mahalaxmi, Dharavi, Chembur and Grant Road area of Mumbai to control loading on 220 KV Khargar - Nerul - Sonkar - Trombay tie line. We are working towards an early resolution and will ensure power supply to these areas at the earliest," Tata Power said in a statement.
According to the company's website, the 500 MW unit, number 5, is coal-based and in operation since 1984.
The areas which faced the blackout are the business districts of Mumbai, with prominent business areas such as Zaveri Bazaar facing a blackout till at least 3:30 pm. Offices of prominent corporates such as Tribhovandas Bhimji Zaveri and Mahindra & Mahindra Ltd were also affected.
India is reeling from an acute shortage of the fuel with the power utilities cutting down on generation. The western and northern grids sent out alerts last week warning regional distribution companies from overdrawing from the grid.
In July 2012 a massive power cut had affected more than 300 million people in five north Indian states.