Green Dragon, the parent company of Greka China, is a gas supplier based in China with a focus on the production, development, production, distribution and sales of coal bed methane (CBM), reports Proactive Investors. The company has expanded its downstream operations, having added a further four retail compressed natural gas (CNG) stations during the first half of the year, taking the total to six. Another ten CNG stations are expected to be added by the end of the current year with a further 15 set to come on stream in 2012.