(EnergyAsia, January 5 2012, Thursday) — Malaysian state oil and gas company Petronas has completed its purchase of a 30% stake in a S$1.2 billion power plant being constructed on Singapore’s Jurong Island by India’s GMR Energy. (US$1=S$1.3). Mumbai-based GMR Infrastructure said its subsidiary, which retains a 70% stake, completed the share transfer in GMR…