The Hong Kong and China Gas Company Limited, together with its subsidiaries, produces, distributes, and markets gas, water supply and energy services in Hong Kong and Mainland China. It is involved in the provision of smart energy, piped city-gas, upstream and midstream projects, water supply and wastewater treatment, urban waste resource utilization, and natural gas filling stations, as well as new energy exploration and utilization activities. The company develops new energy projects that are low in emissions and pollution, which includes clean coal chemical business, liquefaction of methane, etc., as well as supplies town gas.

It also provides network connectivity, data center, and ICT services, as well as engineering, procurement, and construction services. In addition, the company offers consultancy and engineering contractor services, including utilities installation, infrastructure construction, and civil and building services engineering for public and private projects; and designs and manufactures gas meters and metering systems. Further, it is involved in water supply, and domestic sewage and industrial wastewater treatment activities.

Additionally, the company manufactures polyethylene piping and fittings; as well as engages in the software development, solution implementation, and systems integration activities.