Country's largest power producer NTPC said the four units of Koldam hydro electric power project that will supply electricity to Delhi and Uttar Pradesh, among others, have become commercially operational.
"The Unit-I, II, III and IV of 200 MW each of Koldam hydro electric power project is declared on commercial operation with effect from July 18, 2015," National Thermal Power Corporation Limited (NTPC) said in a BSE filing.
With this, the total commercial capacity of the project has become 800 MW and that of NTPC Group - 43,943 MW, it said.
The Koldam hydro power project is located in Mandi district of Himachal Pradesh.
The construction of the project, which started in 2003, was held up because of various environmental and geological issues, leading to a cost overrun of about 20 per cent against the approved investment of Rs 4,527 crore.
It will supply electricity to Delhi, Haryana, Punjab, Rajasthan, Uttar Pradesh, Himachal Pradesh, Jammu & Kashmir and Chandigarh.