
Marmora hydroelectric pumped storage project
From a long inactive, open-pit iron ore mine to an innovative clean energy asset, we’re planning on building a cleaner tomorrow, together.
A powerful partnership
We're building the blueprint for the Marmora Project, a proposed 400-megawatt closed-loop hydroelectric pumped storage project in the Municipality of Marmora and Lake. With enough renewable energy to power up to 400,000 households when demand is at its highest, this innovative project could be the next made-in-Ontario solution to address our growing need for reliable electricity.
This eastern Ontario project is a joint venture between Ontario Power Generation (OPG) and Northland Power, and is currently progressing through a gated approvals process managed by the Independent Electricity System Operator.
Upcoming events
Inclement weather notice: The following information session is still taking place.
Should you be unable to attend, the session materials will be posted to this website.
You can also contact us with questions or join us at additional events in 2023.
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The Project would have an average capacity of 400 MW for five hours, enough to power around 400,000 homes.

The Project is closed loop; this means the same water recirculates between two reservoirs, rather than drawing from waterbodies.

The renewable power stored in a facility like Marmora will help electrify Ontario’s economy.
