Xiao Peng, a senior executive of China Southern Power Grid, is being investigated for duty-related crimes, Guangdong procuratorate announced on Thursday.
Xiao was deputy general manager and a member of the board of the electricity company, one of China's two national power grid operators.
He is the second senior executive to come under the anti-graft microscope from the power company this week. Qi Dacai, who held the same post as Xiao, is suspected of serious breaches of party rules, the Guangdong provincial discipline authority revealed on Monday.
