Hydro-Québec generates, transmits and distributes electricity, mainly using renewable energy sources, in particular hydroelectricity. It also conducts research in energy-related fields and takes an active interest in energy efficiency. In addition, it works to create value from the technologies that emerge from its research.   Its sole shareholder is the Québec government. By law, the Generator supplies the Distributor with an annual heritage pool of electricity. Above that volume, the Distributor obtains its supplies on the open market. Transmission and distribution activities are regulated. The company comprises four divisions:   Hydro-Québec Production Hydro-Québec Production generates and wholesales power on domestic and and external markets.   Hydro-Québec TransÉnergie Hydro-Québec TransÉnergie operates the most extensive transmission system in North America for the benefit of customers inside and outside Québec.   Hydro-Québec Distribution Hydro-Québec Distribution provides Quebecers with a reliable supply of electricity. To meet needs beyond the annual heritage pool supplied by Hydro-Québec Production, it obtains supplies on open markets. It also works to encourage its customers to make efficient use of electricity.   Hydro-Québec Équipement and Société d’énergie de la Baie James, a subsidiary of Hydro-Québec, are the prime contractors in construction projects for Hydro-Québec Production and Hydro-Québec TransÉnergie.