Hongkong Electric Holdings Limited (HEH) is the holding company of The Hongkong Electric Company, Limited (HEC), Hongkong Electric International Limited (HEI) and Associated Technical Services Limited (ATS). HEC is the main operating company of HEH. HEC is responsible for the generation, transmission and distribution of power to Hong Kong Island and Lamma Island. HEI has interests in several power related businesses in Australia, Thailand, Canada and United Kingdom. ATS is a wholly owned subsidiary of HEH engaged in engineering consultancy firm serving the electricity supply industry. During the year ended December 31, 2007, Unit 9, HEC’s gas-fired combined cycle unit generated 17% of the electricity sent out from the Lamma power Station. In May 2008, the Company acquired a 50% interest in Cheung Kong Infrastructure Holdings Ltd.'s subsidiary.