An illustration of the Marmora Pumped Storage layout

Marmora clean energy hub 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.

Project update – July 2023 Province releases Powering Ontario’s Growth plan Learn more

A powerful partnership

We're building the blueprint for the Marmora Project, a proposed clean energy hub featuring a 400-megawatt closed-loop hydroelectric pumped storage facility and up to 50-MW of renewable solar generation in the Municipality of Marmora and Lake. With enough clean 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.

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Project overview

An aerial view of the water in the Marmora mine.

The Project would have an average capacity of 400 MW for five hours, enough to power around 400,000 homes.

An aerial view of the abandoned Marmora mine

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.

A view of the forest near Marmora Lake with a water tower in the foreground.

The Project could create up to 1,000 construction jobs and 300 long-term regionally based jobs.

An illustration of the Marmora project carbon footprint

A battery made from nature

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

An illustration of two people walking through a forest

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.

An illustration of a small town storefront

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.

An electricity transmission tower against a blue, cloudy sky.

News · July 10, 2023

Ontario.ca | Powering Ontario’s Growth

The Ministry of Energy released Ontario’s plan to provide families and industries with reliable, low-cost and clean power.

News · March 22, 2023

CJBQ 800 AM radio | OPG Project Manager Steven Fitzgerald

Steven Fitzgerald appeared on CJBQ's ‘Newsmaker Sunday’ with Mary Thomas to talk about the proposed Marmora Pumped Storage Project.

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