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As the population grows in southwestern Ontario, safe and reliable
power is needed to improve reliability for homes and businesses, secure and diversify supply,
and create opportunities for industries to locate in the area. That’s why Hydro One is proposing
to construct a new double-circuit 230 kilovolt transmission line between our Lambton Transformer
Station, located in St. Clair Township and our Chatham Switching Station, located in the
Municipality of Chatham-Kent.
This project is part of a network of electricity infrastructure projects that will support the
regions’ economic growth. Once built, the St. Clair Transmission Line will support local food
supply and security, economic development and job creation. We’re completing the planning stage
now, so that we can be ready to bring additional power to the region when and where it’s needed.
Expected Completion Date
Current Project Phase
To provide comments or to be added to the project contact list, please
call or email:
The draft Environmental Study Report is available for public review and comment from November 6
to December 7.
Help us build a line that reflects the interests and needs of your community by sharing your
feedback to Hydro One Community Relations at Community.Relations@HydroOne.com or
Hard copies are available at the following locations:
Since the start of this project in February 2022, we have received feedback
and completed environmental studies to select a route that minimizes the impacts to the natural
environment and leverages the opportunity to replace existing electrical infrastructure and
repurpose existing transmission line corridors.
The route refinement is required due to technical and construction
constraints with other existing transmission lines near Otter Creek.
The route refinement is required due to existing underground and overhead
infrastructure owned by an adjacent Wind Farm Facility.
Route refinement consists of moving the transmission line further to the
of Highway 40 to ensure appropriate Ministry of Transportation clearance
Expansion to Wallaceburg Transformer Station is required within Hydro One
lands to accommodate additional electrical equipment that will connect
the new 230kV transmission lines.
Expansion to Chatham-Kent Switching Station on the east side is required
accommodate additional electrical equipment that will connect to the new
230kV transmission lines.
An integral part of this project requires the completion of a Class Environmental Assessment (Class EA),
in accordance with the
Ontario Environmental Assessment Act. Rooted in community engagement and
consultation, the Class EA evaluated proposed alternative routes for the new line that
minimize social, economic and environmental effects.
As Hydro One continues its design and study of the preferred route, we
are committed to listening and incorporating your feedback into the planning stages of this
project. We want to ensure all directly affected property owners understand the work required on
their property and continue have the opportunity to provide feedback.
Following completion of the Class EA, the project will also require
Ontario Energy Board (OEB) approval under Section 92 (Leave to Construct) of the Ontario Energy
In Ontario, the Independent Electricity System Operator (IESO) is responsible for
ensuring that future energy needs are being met. According to the IESO, electricity
demand in the Windsor-Essex and Chatham areas is expected to quadruple by 2035.
To support this growth in southwest Ontario, the IESO requested Hydro One begin
development work in March 2021 to build a new transmission line between our Lambton
Transformer Station in and Chatham Switching Station.
Since February 2022, we’ve sought feedback and completed studies to identify and evaluate
five route alternatives to select a preferred route. Input from Indigenous communities
residents, agencies and the public has been crucial, as well as environmental,
and other considerations, in determining the preferred route for the new line.
We used this data to evaluate the route alternatives and select a preferred route that
balances the natural and socio-economic environments, technical and cost considerations,
Indigenous culture, values and land use. We continue to welcome any feedback on the
preferred route to help ensure the final route is considerate of community interests.
Your feedback is important to the successful development of this critical line in
Southwest Ontario. Since February 2022, we have heard from residents through meetings,
email, phone, workshops, community open houses and surveys/comment forms. The local
knowledge we have received about the environment, including the natural and
socio-economic environment, has helped us to select a route that minimizes adverse
effects to the environment. On balance, the route scored favorably in the natural
environment, Indigenous culture, values and land use and socio-economic areas.
Our goal is to continue hearing as much local input as possible about the preferred route
so that we can work towards building a line that community members and property owners
can see their feedback reflected in.
Please provide your feedback at any time by contacting Hydro One Community Relations at
or 1-877-345-6799 to join our project
contact list and stay involved.
Following the public review and comment period for the draft ESR, comments received will
be addressed in the final ESR Report, which will be filed to the Ministry of the
Environment, Conservation and Parks (MECP).
We remain committed to working closely with community members. The draft ESR includes the
identification of potential effects of the new transmission line and measures to avoid
or mitigate adverse effects.
In designing the line, flexibility may be considered on a property-by-property basis to
best mitigate effects to properties traversed by the line where practicable and
feasible. For example, this could include slight deviations within the right-of-way,
bringing towers closer to road, considering larger spanning or spacing distances.
With the selection of a preferred route, we can begin the detailed engineering design,
which will influence the size, location and number of towers required, as well as the
That said, Hydro One has been powering southwestern Ontario for over 100 years and we
know the typical right-of-way required for a 230-kilovolt transmission line is
approximately 46 metres in width. We also anticipate the typical tower footprint will
range from 6 metres x 6 metres to 12 metres x 12 metres, depending on the tower design.
The typical tower height is influenced by environmental conditions like topography, and
we anticipate will range between 30 metres and 60 metres.
We know the important role farmers have in supporting Ontario’s economy and we are
committed to minimize potential affects to agricultural operations during and after
construction. These measures, as outlined in Chapter 7 of the draft Environmental Study
Report include, using existing access as much as possible and building new roads to the
minimum length and width, avoid and protect tile drains, proactively communicate work
activities with farmers that may disturb livestock and consult on mitigation measures
such as moving or containing the livestock, restore land following construction
Preferred Route Announcement Community Open Houses
In-Person and Virtual Community Open Houses
Virtual Community Open House & Live Discussion
Notice of Commencement
To provide comments or to be added to the project contact list, please call or