The Caisse de dépôt et placement du Québec is set to invest in provincial infrastructure projects, primarily in the area of public transportation.
Couillard, Finance Minister Carlos Leitao and the head of the Caisse de dépôt Michael Sabia are expected to hold a 10:30 a.m. news conference.
Funding from the Caisse could take the form of financing for municipal or Crown corporation projects.
While the details aren't yet clear, the partnership could provide the necessary cash for long-awaited projects such as a light-rail transit system on the new Champlain Bridge and the Train de l'Ouest to improve commuter train service to the West Island.
The Caisse's assets are estimated at $214 billion.