The northern, eastern and north eastern grids tripped again on Tuesday, leading to power failure in 20 states of the country.
While the Northern Grid collapsed for the second time in two days, the eastern transmission lines too failed this afternoon, said officials at the power ministry and electricity companies.
Power supply was disrupted in Delhi, Uttar Pradesh, Haryana and Punjab, among other states.
"Yes, I've heard that the northern and eastern grids have failed. We are looking into the matter," power minister Sushil Kumar Shinde said.
The power crisis led to immediate shut-down of Delhi Metro lines, while several other serivices, including railways were also affected.
"We are having problems in Northern Grid," K Soonee, CEO of Power System Operating Corporation (PSOC) said.
Power ministry officials said that Eastern Grid had also failed. The reasons for the grid failure were not immediately known.
While an almost 15-hour power crisis was seen in the Northern part yesterday, the crisis on Tuesday reached the Eastern region as well.
Delhi government officials said the Northern Grid failed at around 1:30 PM, when the national capital had a demand of around 4,000 MW. Only 38 MW was being supplied at around 1:45pm.