Come to our Open houses in May. See details below.
Waasigan Transmission Line Project Logo
Hydro One wants to support growth in northwestern Ontario and energize life for communities and businesses in the region. Energizing life means more than supplying safe and reliable power, it means listening and taking action to meet your needs. The northwest has advocated for an increase in power for many years to support community and industry growth.

We are investing in the development work for the Waasigan Transmission Line now so that power is available when it’s needed.

First Nations partners

Thank you for joining our recent Community Open Houses!

If you were unable to attend the in-person open houses May 3 – 5 and missed the virtual open house on May 18, please know a recording of the virtual open house will be made available soon. In the meantime, the materials from the in-person open houses are available here. You can also contact us at anytime, at or toll-free 1-877-345-6799.

Project Overview

The Waasigan Transmission Line is a proposed new double-circuit 230 kilovolt transmission line between Lakehead Transformer Station (TS) in the Municipality of Shuniah and Mackenzie TS in the Town of Atikokan, and a new single-circuit 230 kilovolt transmission line between Mackenzie TS and Dryden TS in the City of Dryden. Demand for more electricity is anticipated as early as the mid-2020s, and we are undertaking the development work now, including an environmental assessment, so we are ready to support the region’s electricity needs.

Mining and forestry play a key role in driving economic growth in the northwest. According to the Thunder Bay Community Economic Development Commission’s 2021 mining readiness report, mining-related electricity demand in the northwest is expected to increase 180% over the next five years. Waasigan will bring an additional 350 megawatts of power to the region, enough to supply approximately 11 new average mining operations.

View our interactive map showing the project area and the alternatives routes identified for the project. A preferred route will be selected during the environmental assessment following an evaluation of the alternative routes.

View Interactive Map

Waasigan Transmission Line Map

Waasigan Transmission Line Map Enlarge (.PDF) en français (.PDF)

Environmental Assessment (EA) Process

The project is subject to a comprehensive environmental assessment process under Ontario’s Environmental Assessment Act. As part of the EA, we are evaluating the alternative routes to select a preferred route for the new line that is considerate of the natural environment, socio-economic environment, technical and cost, and Indigenous community values.

Hydro One commenced the EA on March 9, 2022.

View EA Notice of Commencementaussi disponible en français

Click here to learn more.

Working with Indigenous Communities

We are committed to working together with Indigenous communities throughout the life cycle of Waasigan to build a brighter future for all.

Click here to learn more.


  • April 2019
  • Notice of commencement of the Terms of Reference for the environmental assessment

  • Spring 2019 -
    Spring 2020
  • Consultation, data collection, and development of corridor alternatives

  • June 29 -
    Aug 14 2020
  • Draft Terms of Reference review

  • Fall 2020
  • Proposed Terms of Reference submitted to the Ministry of the Environment, Conservation and Parks

  • February 2022
  • Terms of Reference approved by Ministry of the Environment, Conservation and Parks

    9, 2022
  • Notice of Commencement of environmental assessment

  • 2022 - 2023
  • Consultation and data collection on environmental assessment study areas

  • 2023
  • Draft environmental assessment review

  • 2023
  • Leave to Construct (Section 92) application submission to the Ontario Energy Board*

  • 2024
  • Decision on Environmental Assessment by Ministry of the Environment, Conservation and Parks

  • 2024
  • Leave to Construct (Section 92) application approval from the Ontario Energy Board (anticipated)

  • By end
    of 2024
  • Complete development work

*Leave to Construct under Section 92 of the Ontario Energy Board Act, 1998 is a regulatory process to obtain approval from the OEB to build and operate a transmission line. Hydro One will not apply for this approval until direction is received by the IESO to proceed with the project.

NOTE: All dates are anticipated and could change based on project feedback.

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View maps related to this project here.

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Project Approvals

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Photo of a Hydro One public consultation meeting held in a community centre

Public Consultation

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Working with Indigenous Communities

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Contact Us

To provide comments or to be added to the project contact list, please call or email:

Tel: 1-877-345-6799