GUANGZHOU, Feb. 9 -- Wu Zhouchun, former boss of Guangdong Power Grid, is being investigated over suspected serious discipline violations, the Guangdong provincial commission of discipline inspection of the Communist Party of China said Sunday.

Guangdong Power Grid is a wholly-owned subsidiary of China Southern Power Grid Co., Ltd, one of China's two grid giants.

Wu became general manager of Guangdong Power Grid in 2003, and moved to the post of assistant to the general manager of China Southern Power Grid in 2009.

CPC's discipline inspection agencies punished about 182,000 officials nationwide in 2013, and central authorities have reiterated their firm stance to fight corruption on many occasions this year.