GUANGZHOU - ?The fourth unit of the Yangjiang nuclear power plant in the southern province of Guangdong was connected to the grid on Sunday, said China General Nuclear Power Corp. (CGN), the owner of the plant.

The fourth unit now enters the final testing phase before its commercial operation, said the company.

The first, second and third units of the nuclear power plant have all realized commercial operation. The fifth and sixth units are under construction.

The CGN has currently 20 nuclear power units capable of generation, with a total installed capacity of more than 20 million kw.