A major electricity grid failure, which was the worst in a decade, resulted in a black in various states in Northern India on Monday.

Estimate show that more than 300 million people were without power in the national capital Delhi as well as several other states in the region. The electricity supply was cut in Delhi and seven states in the early hours and was restored only in the morning.

Residents of the capital first faced a night without power only to be stranded on metro stations as the service was not running due to the power failure. Power Minister Sushilkumar Shinde said that the grid failure was caused by a incident near Agra but he did not give more details about the issue.

He said that about 60 per cent of the service was restored by morning and assured that full service will be restored by the afternoon. The outage had resulted in the shutdown of hydroelectric plants Himachal Pradesh and thermal power stations in Punjab and Haryana.

“Some fault has occurred near Agra. This is an accident. Already, teams have rushed to the spot. Almost 60 per cent of supplies have been restored by 11 am on Monday. Remaining would be restored in another couple of hours,” said Shinde.

He said that the outage happened after 10 years and about 8,200 megawatts of supplies from hydropower have been arranged to be flown into the grid since morning. He added that power supplies were also taken from the eastern grid.