What year did Pakistan sign an agreement with China for their assistance in building nuclear power plants ?
The Chashma Nuclear Power Complex near Chashma city , Punjab , Pakistan , is a commercial nuclear power generation complex , consisting of Chashma Nuclear Power Plant - I ( CHASNUPP - I ) and Chashma Nuclear Power Plant - II ( CHASNUPP - II ) , with CHASNUPP - III and CHASNUPP - IV under construction .