"Only 10 per cent work was done when former prime minister (Sharif) decided to complete it. If we have succeeded it is due to his vision and efforts," Abbasi said.
As the project was delayed, the cost climbed to USD 5 billion, a three-fold increase to the initial estimates, Abbasi said, adding the project would be fully operational before the end of this year.
Abbasi thanked China for support and also paid tribute to 21 workers who died while working on the project.
Abbasi further said that government added about 10,400 MW power into the system in five years and addressed the chronic power shortage.
Pakistan-occupied Kashmir Prime Minister Raja Farooq Haider addressing on the occasion demanded that 250 MW of electricity from project should be dedicated to PoK to end energy crisis.
Earlier, chief of Water and Power Development Authority (Wapda), Muzammil Hussain, said the NJHPP was conceived some three decades ago but the work was started only after it became evident that India was planning to build Kishanganga project.