Seventy per cent or 24,300 MW of power has been restored in the northern region, including Delhi, till 1930 hours, Power Grid said in a statement.
In Delhi, 100 per cent or 4,100 MW, has resumed. State-run Power Grid, which manages grids across the country, said that "supply to (Delhi) Metro and Railway traction (was) restored at 1530 hours".
Power Grid said full electricity supply has been restored in the North East.
In the Eastern region, 50 per cent supply has been restored till 2030 hours.
Triggering a major power crisis, the three major grids -- Northern, Eastern and North Eastern -- failed at 1300 hours.
Even though the exact reason is yet to be ascertained, officials said that problems started in the Eastern Grid and there could also have been over drawals by some states.
New Delhi: Electricity supply has been restored in close to three-fourth of the areas in the northern region, including the national capital, that were severely impacted by power outages since Tuesday afternoon.
First Published: Tuesday, July 31, 2012, 21:46