China Longyuan Power (HKG:0916, SHE:001289) proposed to fully acquire Guoneng Badain Jaran (Gansu) Energy Development and Investment for 24.6 million yuan, according to a Shenzhen bourse filing on Saturday.
The power company's Shenzhen shares slumped 9%, while Hong Kong shares slipped 1% during Monday's afternoon trade.
Longyuan, which currently owns 51% of the heat production firm and coal firm, will buy the remaining 49% from China Energy Investment.
The board of directors approved the proposal on June 26.