IPO-bound Thai Gulf Energy to invest $4.6b in SE Asia power plants Sarath Ratanavadi. Photo: Bloomberg Anuchit Nguyen November 27, 2017 PremiumGulf Energy Development Pcl’s billionaire founder Sarath Ratanavadi plans 150 billion baht ($4.6 billion) of investment in power plants over the next four years after the company’s listing this month. Continue reading this story with a subscription to DealStreetAsia. Subscribe Already a subscriber? Log in Should your colleagues be reading this article too? Contact us for corporate subscriptions at email@example.com.