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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 Transmission Station,
located in St. Clair Township and our Chatham Switching Station, located in the Municipality
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.
To provide comments or to be added to the project contact list, please call or email:
Through technical studies and feedback, we’ve gained a more in-depth understanding of the study area for each of the alternative routes and have made three refinements to our routes and have identified the need to expand Chatham Switching Station, Lambton Transformer Station and a potential for Wallaceburg Transformer Station.
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 west of Highway 40 to ensure appropriate Ministry of Transportation clearance requirements.
Expansion to Wallaceburg Transformer Station is required within Hydro One lands to accommodate additional electrical equipment that will connect to the new 230kV transmission lines.
Expansion to Chatham-Kent Switching Station on the east side is required to accommodate additional electrical equipment that will connect to the new 230kV transmission lines.
We are committed to listening and incorporating your feedback into the planning stages of the
proposed new transmission line. 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 will evaluate proposed alternative routes for the new line that minimize social,
economic and environmental effects.
Engagement with Indigenous communities, government officials and agencies, interests persons
and organizations throughout the project, through opportunities like community open houses,
is critical to help us select a preferred route that considers the needs and interests of
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 Board Act.
In Ontario, the Independent Electricity System Operator (IESO) is responsible for ensuring
that future energy needs are being met. According to the IESO, agricultural 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.
As a part of the Class Environmental Assessment our team conducted preliminary work to
identify 5 possible route alternatives for the new transmission line, which consider
existing baseline information about the environment, such as waterbodies, residential areas,
environmentally significant areas and we looked for opportunities to parallel linear
infrastructure and utilize existing easements.
Prior to the start of the Class Environmental Assessment, our team conducted preliminary work
to identify to identify 5 possible route alternatives for the new transmission line,
including opportunities to parallel existing transmission lines. During the Environmental
Assessment process, we evaluate each of the route alternatives in an effort to select a
preferred route that minimizes environmental effects.
Co-locating with existing linear infrastructure has the potential to offer several
advantages, many of which are greater if co-locating with an existing transmission line,
such as minimizing disturbance to natural areas and sensitive habitats by using existing
access, reducing the width of new right-of-way required, minimizing visual effects, and
decreasing overall operating costs.
A preferred route has not been selected at this time. As part of the environmental assessment
process, we will be evaluating the alternative routes through consultation, environmental
field studies and technical assessments. It is our goal to select a preferred route that
will minimize adverse effects to the environment. Input from Indigenous communities,
agencies and the public is crucial, along with environmental, technical, and other
considerations, in determining the preferred route for the new line.
We anticipated a preferred route will be selected in Spring 2023 and will continue to keep
community members informed and to seek your feedback. Please contact Hydro One Community
Relations at Community.Relations@HydroOne.com or 1-877-345-6799 to join our project contact
list and stay involved. Your feedback is valued.
Your feedback is an important part of the planning process for this proposed new transmission
line. Our team has been collecting input since March 2022 through meetings, email, phone,
workshops, community open houses and surveys/comment forms to help us build a line that is
considerate of the interests and needs of the community.
Your local knowledge about the environment, including the natural and socio-economic
environment, will help us better assess the alternative routes to select a preferred route
that minimizes adverse effects to the environment. Your input can also help us develop and
prioritize the type of criteria that will be used to evaluate and compare each route before
selecting a preferred route, as well as identify potential ways to avoid, mitigate or
restore potential Project impacts.
Please provide your feedback at any time by contacting Hydro One Community Relations at
Community.Relations@HydroOne.com or 1-877-345-6799.
Once a preferred route is selected for the new line, Hydro One will be able to determine the
property requirements for the Project and work with directly impacted property owners who
have a proposed structure or section of corridor on their property. Hydro One’s goal is to
secure voluntary property settlements with affected property owners in a timely manner.
We will know more accurately the size, location and number of towers required, as well as the right-of-way width after a preferred route is identified and we can complete the engineering design.
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.
As well, the typical footprint of a tower ranges from 8 metres x 8 metres to 14 metres x 14 metres, depending on the design. The typical height of a tower is influenced by environmental conditions like topography and range between 30 metres and 50 metres, depending on the design.
As we continue our environmental and construction planning for this
project, we will look for opportunities to avoid, protect and prevent
damage to environmental features including soil compaction and drainage, to
every extent possible and, where applicable, complete restoration.
It is our goal to build a line that is considerate of the interests and
needs of the community. Feedback gathered through ongoing consultation with
farmers and other community members will be considered in the selection of
tower design, construction methodologies, operations and maintenance
Additionally, once a preferred route is selected, a dedicated Hydro One
real estate representative will work closely with directly impacted
property owners who have the preferred right-of-way on their property.
During these one-on-one conversations, we will collect information specific
to their property.