New Delhi, Jul 30 (IANS): Power supply in seven states across north India was hit early Monday following a breakdown in the Northern Grid, an official said.

Apart from Delhi, supply in Punjab, Haryana, Himachal Pradesh, Uttar Pradesh, Rajasthan and Jammu and Kashmir were disrupted.

"Power supply has been disrupted in seven states from 2.32 a.m. It has been partially affected in Delhi and Rajasthan. We are in the process of restoring the supply," V.V. Sharma, general manager of Power System Operation Corporation Limited, told IANS.

According to the Power System Operation Corp Ltd, the exact reasons for the grid failure are being ascertained.

"The trouble resulted in power outage in the entire northern region, but for parts of Badarpur in south Delhi, Narora and Simbhauli in Uttar Pradesh and Bhinma in Rajasthan," a statement said.

The company, a subsidiary of the state-run Power Grid Corporation of India, which manages the grid, said effort was underway to seek supplies from the eastern and the western regions, even as power to the railway system had been partially restored.

"The restoration of the grid may take a few more hours. The engineers have been trying to restore it since early morning. We are giving first priority to public services like hospitals and transport," Sharma added.

As a result of the power failure, Delhi Metro services were disrupted for more than two hours Monday.