OPG logo     x  OPG logo

OPG logo     x  OPG logo

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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Project overview

An illustration of the Marmora project carbon footprint

A battery made from nature

Learn more about Canada’s first closed-loop hydro storage project.  

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We’re planning for a cleaner tomorrow

The Marmora Project could potentially displace between 70,000 and 140,000 tonnes of greenhouse gas emissions every year.

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We plan to deliver long-term value

The Marmora Project is estimated to provide up to a $35-million annual economic benefit throughout eastern Ontario.