Power Transmission Projects

120-kV Chaudière–Saint-Agapit Line

Hydro-Québec has prepared a development plan for its facilities in the Chaudière-Appalaches region to ensure the quality and reliability of power supply over the next 30 years. The company will make investments in its 69-kV facilities in conjunction with its plans to replace Scott and Beaurivage substations and related lines.

Of the two 69-kV lines (circuits 785 and 787) connecting Chaudière and Saint-Agapit substations, circuit 787 no longer has sufficient capacity to take over in the event that circuit 785 fails, which could compromise the supply of power to customers.

Given that investment would be needed to maintain circuit 785 over the medium term, Hydro-Québec proposes to build a 120-kV double-circuit line about 20 km long between Chaudière and Saint-Agapit substations. This line would meet new ice-loading standards and would be operated at 69 kV until all of the 69-kV facilities in the region are converted to 120 kV. After its commissioning, planned for 2013, the company will dismantle circuits 785 (19 km) and 787 (25 km).

Work is expected to start in spring 2013, with commissioning slated for the fall of that year.

To learn more about the project, consult the Documents section above.