The agreement, which was originally signed in 2008, will cover service and maintenance, technology development and strategic investment.
Currently, Westinghouse and its consortium team member Shaw Group, are providing four AP1000 units in China, two each at Sanmen and Haiyang.
Westinghouse president and CEO Dr Aris Candris said that China has undertaken an aggressive and forward-looking program to generate electricity in an environmentally friendly manner.
Earlier, Westinghouse had signed agreements to form a joint venture for building and operating a nuclear-grade zirconium sponge facility in Jiangsu Province.
Westinghouse has also, among other things, provided service support at the Qinshan site in Zhejiang Province and at the Daya Bay site in Guangdong Province.
