OPG and Northland Power Inc have proposed a first-of-a-kind project for Canada that would develop a pumped storage project at a long inactive, open-pit iron ore mine. The Marmora Pumped Storage Project is a joint-venture between the two power producers. Located in the Municipality of Marmora and Lake in Ontario, the proposed 400MW closed-loop pumped storage facility could power up to 400,000 homes at peak demand with clean, renewable electricity for up to five hours.