Marmora Clean Energy Hub Project

Northland Power Inc., in partnership with Ontario Power Generation, is proposing the construction and operation of a new pumped storage and hydroelectric generating facility located in the municipality of Marmora and Lake, Ontario. As proposed, the Marmora Clean Energy Hub Project would produce up to 500 megawatts, and operate for 100 years. The open-pit lake from the abandoned Marmoraton iron ore mine would be transformed into the lower reservoir of the facility. The project would include an upper reservoir, tunnels and a powerhouse, a water delivery system, and an underground transmission line. The project would also include a 30-megawatt ground-mount solar facility, which would operate for at least 25 years.

Latest update

July 20, 2023 — On July 14, the Impact Assessment Agency of Canada suspended the time limit for the impact assessment at the request of the proponent.


July 11, 2023 — The Impact Assessment Agency of Canada issued the Summary of Issues to the proponent on June 29, 2023 for the preparation of the Detailed Project Description and Response to the Summary of Issues.

At a glance


Time limit suspension

The time limit for the impact assessment process was suspended on July 14, 2023 at the request of the proponent and the number of days will not advance.


Suspended 56/180 days

Key documents

Impact Statement

Impact Statement

Not started 0/1095 days
Impact Assessment

Impact Assessment

Not started 0/300 days
Decision Making

Decision Making

Not started 0/30 days
Post Decision

Post Decision phase is an ongoing process

If approved, the project may proceed to construction as federal authorizations and permits are issued, and as conditions and other requirements are met.

Post Decision

Not started



Marmora Clean Energy Hub Project
Impact Assessment Agency of Canada
600-55 York Street
Toronto, Ontario M5J 1R7
Telephone: 416-952-1576

  • Location

    • Municipality of Marmora and Lake, in Hastings County (Ontario)
  • Nature of Activity

    • Other, not otherwise specified
  • Assessment Status

  • Start Date

  • Proponent

    Northland Power Inc. and Ontario Power Generation
  • Authorities

    • Impact Assessment Agency of Canada
  • Assessment Type

    Planning Phase for Impact Assessment
  • Reference Number


This map is for illustrative purposes. The markers represent the approximate locations based on available data. More than one marker may be identified for a given assessment.


Nearby assessments

...within 200 kilometres
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