Project Overview

Hydro One and Veridian have completed the Class Environmental Assessment for Seaton Municipal Transformer Station (MTS). 
The final ESR and accompanying appendices can be viewed on Veridian’s website or here.

Through an assessment of anticipated future electrical demand in North Pickering, Veridian identified that building a new municipal power transformer station (Seaton MTS) would best serve the growing number of homes and businesses in the area.

In June 2015 Veridian initiated a ​Class Environmental Assessment (EA) to evaluate three alternative transformer station sites. To ensure Veridian’s new facility has an adequate supply of power, it must be connected to our high-voltage grid.

View Veridian’s Initial Notice of Commencement: Seaton Municipal Transformer Station.

We are working with Veridian to update the Class EA Study to plan for the construction of the new station and its connection to our high-voltage system. The revised study will evaluate and determine a preferred location for the proposed transformer station and the associated transmission line connection.

The updated Class EA will evaluate the following:
  1. Alternative sites for the construction of a new municipal transformer station (Seaton MTS), to be owned and operated by Veridian.

  2. Connecting Seaton MTS to our existing 230 kV transmission line in this area. Depending on the station site selected, the line connection will involve either:​ 

    • ​Replacing a section of our existing single circuit (three wires) 230 kV line with a double circuit (six wires) 230 kV line or;​

    • Upgrading components such as the insulators and conductor (wire) on a section of our existing 230 kV transmission line ​​

  3. ​​The construction of a tap line to connect the station to the existing 230 kV transmission line.​​

​​View the role we play in delivering power to your community:

Infographic: Construction of Tap Line to Connect the Station to the existing 230 kV transmission line 

Public and Stakeholder Consultation Timeline:

  • Fall2016
  • Briefing for City of Pickering officials

  • Fall2016
  • Revised Class Environmental Assessment Initiated

  • Fall2016
  • Public Information Centre #1

  • Introduction to updated project

  • Win
  • Public Information Centre #2

  • Selection of preferred station location and associated transmission line connection

  • FALL2017
  • Draft Environmental Study Report available for a 30-day public review period

  • WIN2018
  • Anticipated Final Environmental Study Report filed with the Ministry of the Environment and Climate Change

  • MID-2018
  • Anticipated Start of Construction

  • (Contingent on the outcome of the Class EA process)

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Project Approvals

Learn more about the work we have completed to ensure provincial approval for this project.

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Public consultation

Public Consultation

Learn more about the Public Information Centres (PICs) we conducted to support this project.

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Maps and Diagrams

View maps and diagrams related to this project.

View Maps and Diagrams


Contact Us

For more information or to be added to the project contact list, please contact:

Dana Gardner
Community Relations
Hydro One Networks Inc.

Tel: 416-345-6799 or 1-877-345-6799

Fax: 416-345-6984