India's biggest stock exchange NSE tweeted that it is functioning normally amid a major power outage in Mumbai. A grid failure caused a massive power outage in India's financial capital Mumbai and surrounding areas today, authorities said.

                                

"NSE is functioning normally. Report of major power outage in Mumbai," NSE said in a tweet.

Another stock exchange BSE continued to function normally, Bloomberg reported, citing a spokesperson. BSE also carried out the listing ceremony for Mazagon Shipbuilders in the morning, the exchange spokesperson said.

Many traders said the activity wasn’t much affected but if the outage is prolonged then it could impact trading volumes, according to Bloomberg.

In a tweet, Brihanmumbai Electricity Supply and Transport (BEST) said, “The electric supply is interrupted due to TATAs incoming electric supply failure."

Multiple operators, including the state-run BEST, Adani Electricity and Tata Power supply power to the city.

Central Railway in a tweet said that "Mumbai Suburban trains on CR held up due to grid failure. We will update ASAP. Kindly bear with us."

Tata Power in a tweet said: "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. Restoration work in is in progress to bring supply from the 3 Hydro units and Trombay units once the MSETCL transmission lines are connected. inconvenience is regretted."

Adani Electricity – Mumbai in a tweet said," There is a major power grid failure due to which supply is affected in most areas of Mumbai. As per grid safety protocols, Adani Power System has been able to sustain and islanded."

"AEML is currently supplying to critical services in Mumbai Around 385MW through AEML Dahanu generation. Our teams are working to restore the supply in the affected areas at the earliest. We regret the inconvenience caused," it added.