Power Grid Corp India Ltd sources said that the Tuesday's collapse is the most severe ever in the country. "Grid incident occured at 1300hrs effecting the Northern, Eastern & North Eastern Grid. System under restoration," Eastern Regional Load despatch Centres said.
Central Electricity Authority officials have said that the collapse of three grids is unprecedented. "May take over a day to recover. Three grids - Northern, North eastern, and eastern - have collapsed together. The grids will be restored seperately," officials said.
According to the officials, hydro power plants will be started first. Thermal plants may take the longest to come back on stream. "The entire drill may take a complete day. Situation may be normal by Wednesday," they added.
All power generating stations connected to North, East and North East have been shut down.
Kolkata, however, was partly insulated from the outage as the city is supplied by CESC Ltd, which has its own sources also. A top CESC executive told ET that that the city has a shortfall of 400-500 mw.
Monday's collapse of the northern grid, the worst in a decade, was triggered by violation of discipline by states, which drew excessive power, which some officials said was due to political pressures.
Hundreds of millions without power in India
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The country's power minister has blamed the crisis on states drawing too much power from the national grid.
In a statement on national TV on Tuesday evening, Power Minister Sushil Kumar Shinde said he had appealed to states to stop trying to take more than their quota of power.
"I have also instructed my officials to penalise the states which overdraw from the grid," he said.
Media reports in India have suggested that Uttar Pradesh is among the states that government officials have been blaming for the grid collapse.
But officials in the state denied this, saying there was "no reason to believe that