Hong Kong and China Gas Co Ltd, is the oldest public utility company in Hong Kong. The company's core business comprises the production and distribution of town gas in Hong Kong, with a monopoly on distribution and retail. The company is also investing in water, upstream gas, and new energies. The Group's principal activities are the production, distribution, and marketing of gas and related products or services, water supply and waste treatment, renewable energy businesses, extended businesses, and fuels businesses (Green Fuels) in Hong Kong and the Chinese mainland. The company operates in three segments: Gas, water and waste treatment, renewable energy, extended businesses, and related businesses, Green Fuels, and Property.