However, power utilities of both states said it will take some more time to begin generation in all their power plants.
"We have been able to restore about 3,000 MW of power in the state so far and we are increasing the load gradually," Haryana, Special Secretary (Power), Tarun Bajaj told PTI here.
Panipat's 250 MW unit has started generating power, while rest of its units will start generation soon. Moreover, Faridabad's gas-based power plant has also started working, which has a capacity of 430 MW, he said.
"All our 400 KV and 200 KV lines have been synchronised," he said, adding that the hydel power units have also begun power generation.
However, he said it will still take 2-3 hours to restore the entire power generation in the state. "Coal fired plants take time in generating power," he said.
In case of Punjab, power supply to major cities like Ludhiana, Amritsar and Jalandhar has been restored, while efforts are being made to bring the power situation to normal.
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Banking and hospital services remained largely unaffected in Jalandhar city owing to the availability of sufficient power back-up service.
"Our hospital has power back-up. So main services here have remained unaffected," a doctor in Jalandhar R L Vasan said.
"Apart from the ATMs outside the bank branches, the banking services in the state have not been affected. Banks have enough back-up facility to carry out transactions in such situations," Punjab Bank Employees Federation Vice-President Amrit Lal said.
Lehra Mohabbat's 210 MW unit and Bathinda power plant's 110 MW unit have been started as well, said Punjab State Power Corporation Limited, Director Generation, G S Chhabra.
"But it will take 5 hours at least to restore power supply in entire Punjab," he said.
In Chandigarh, power supply at most of the places has been restored with the supply of power from Bhakra Beas Management Board's power project.
With the failure of northern grid early this morning, the power supply in Punjab, Haryana and Chandigarh was hit, thereby also affecting drinking water supply and railway services.
The northern grid collapsed at around 2:30 AM in the morning, hitting power supply to northern states including Punjab, Haryana, Rajasthan Uttar Pradesh, Himachal Pradesh, Chandigarh (Union Territory) and Jammu and Kashmir.
As a direct fallout of power failure, people in both states and the UTs faced a tough time as there was no supply of drinking water in the morning.
Rail passengers also had a tough time with several trains getting disrupted in Punjab, Haryana and Chandigarh.
A number of passenger trains bound for Delhi and beyond, Chandigarh, Amritsar, Jammu, Ferozepur and Kalka were stranded at various stations due to failure of electricity, a senior railway official told PTI.