The project comprising two units of 660 MW each and being built in Sahiwal will be operational in two years, state-run APP news agency reported.
Work on the collaborative project between the Punjab government and Chinese companies to set up the plant will begin this month.
"The coal project will generate 1,320MW of electricity and will be completed in 30 months with China's assistance," Sharif said as he addressed Chinese delegates during the inauguration ceremony.
Sharif said he met the two investors who were now building the Sahiwal power plant at the Economic Summit in Boao, China, two months back and within a short time the initial work for the starting the project was accomplished.
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He said if a project can start in only two months time then there could be no hurdle in its completion in two years.
It would bring 30 per cent returns to the investors, Sharif added.
Sharif promised to double the power generation in next eight to ten years.
A similar power project to generate 1320 MW electricity at Port Qasim was inaugurated by Sharif a few weeks back.
The Prime Minister would be inaugurating a power project in Nandipur on Saturday.