City of Edmonton transmission reinforcement

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Project updates
Proposed lines and substation
Approval process and proposed project schedule
Engagement opportunities
- What we heard

EPCOR is gathering feedback for a proposed electrical transmission development called the City of Edmonton Transmission Reinforcement (CETR) project. This project is needed to provide long-term reliable electricity and replace aging infrastructure.

The Alberta Electric System Operator (AESO) has identified a need to reinforce the electric system in northeast Edmonton and replace aging infrastructure. To meet this need, the AESO has directed EPCOR to plan the following transmission facilities:

New 240 kV transmission lines
New 72 kV transmission lines
A new substation

Project updates

In April 2024, we sent out information that included above ground route options and an underground route option for the double circuit 240 kV transmission line.

Since that time, we have developed three “hybrid route” options that combine both above and underground segments. These three hybrid options are being considered along with the above ground route that runs along the south side of Yellowhead Trail and the full underground route on the north side of Yellowhead Trail. We have updated the route options for the 240 kV transmission lines which includes three hybrid route options that combine both above ground and underground segments.

Latest project notices

Project map

Once you select a location, use the scene configuration tool (top right) to view the different route segments. View route segments on the 240 kV or 72 kV transmission lines below.

Proposed lines and substation

Learn more about the project's proposed new substation and route options for the 240 kV lines (indicated by yellow on the map) or 72 kV line (indicated by green on the map).

240 kV transmission line

A new double circuit 240 kV transmission line is being planned to reinforce the electrical transmission system in northeast Edmonton. We are trying to determine the best route from an existing transmission line to a planned new substation located west of 62 Street and 125 Avenue. Although there are multiple options shown, only one route will be built.

In April 2024, we sent out information that included above ground route options and an underground route option for the double circuit 240 kV transmission line. Since that time, we have developed three “hybrid route” options that combine both above and underground segments. These three hybrid options are being considered along with the above ground route that runs along the south side of Yellowhead Trail and the full underground route on the north side of Yellowhead Trail.

We are no longer considering the entire above ground route segments on the north side of Yellowhead Trail (N1 and N2) due to technical constraints.

The five route options that are currently under consideration are shown in the maps below. Although there are multiple route options, only one route will be built if this project is approved by the Alberta Utilities Commission.

This will be a double circuit transmission line, which means there are two transmission lines using mostly one set of structures. The structures will have six transmission wires (three on each side), one or two shield/fibre optic wires strung on top and one wire below the transmission wires. Structures would be installed along the route using drills, excavators and other equipment. A crane would be used to attach the wires in stages to reduce impacts to roadways. Two main structures would be used for an above ground transmission line: Structure A and Structure B (shown below). These are steel monopole structures ranging in height from 36 to 46 metres.

View non-typical structures.

If a hybrid or underground route is selected, two structures will be used to transition the transmission line from underground to above ground and will be approximately 38-42 metres tall and 7-10 metres wide. The red boxes on the map show approximately where these structures would be located for each route option. The typical structures required for the above ground transmission line remain the same as shown in the April 2024 project notice.

The underground transmission line segments/route would require the construction of a duct bank approximately 1.5 metres wide and 1.2 metres deep. A duct bank is an underground concrete container that protects power cables from getting damaged. This would be installed approximately 1-2 metres deep with utility access points constructed along the route for maintenance and repairs. The installation of the duct bank would involve open cut trench excavation for most of the route and a trenchless method would be used for major road and railway crossings.

A right-of-way is the area we need to safely operate and maintain our power lines. EPCOR manages the right-of-way for above ground power lines to prevent objects from contacting the wires, this includes trees and other vegetation. Our tree maintenance program monitors vegetation in the right-of-way and ensures that trimming is completed when required. In some situations, this could extend outside of the right-of-way.

The right-of-way for an above ground 240 kV transmission line would vary based on the structure type. Structure type A would require a 28 metre right-of-way (14 metres on each side of the structures). Structure type B would be used in areas where there is limited space and requires a 20 metre right-of-way (10 metres on each side of the structures). The right-of-way for an underground 240 kV transmission line would be 10 metres.

A right-of-way for underground transmission lines ensures access for maintenance and keeps the area clear to prevent damage to the duct bank. Areas where the right-of-way overlaps with private property will require an easement between EPCOR and the property owner. You will be contacted directly if your property overlaps with the right-of-way. There are no development restrictions outside of the right-of-way.

72 kV transmission line

A new double circuit 72 kV transmission line is being planned to reinforce the electrical transmission system in northeast Edmonton. We are trying to determine the best route from the existing Namao Substation to the planned new substation west of 62 Street and 125 Avenue. After careful consideration, we have narrowed down the route options.

These will be a double circuit transmission line, which are two transmission lines using mostly one set of structures. By using double circuit transmission lines, we can meet the demand for electricity in the area with the least amount of transmission line routes and structures.

There are multiple paths we could take to get from the existing Namao Substation to the planned new substation. These routes are shown in dark blue on the map. These are shown in four segments: N1, N2, S1 and S2. Combinations could include:

S1 to S2
S1 to N2
N1 to N2
N1 to S2

If approved, the 72 kV transmission line will be built using mostly composite fiberglass or steel poles ranging in height from 18 to 24 metres. Some of the route options follow existing distribution power lines. In these areas, every second or third distribution pole would be replaced with a transmission pole. This will be a double circuit transmission line, which means there are two transmission lines using mostly one set of structures. The structures will have six transmission wires (three on each side) with one or two shield/fibre optic wires strung on top. Structures would be installed along the route using drills, excavators and other equipment. A crane would be used to attach the wires in stages to reduce impacts to roadways.

View non-typical structures.

A right-of-way is the area we need to safely operate and maintain our power lines. EPCOR manages the right-of-way to prevent objects from contacting the wires, this includes trees and other vegetation. Our tree maintenance program monitors vegetation in the right-of-way and ensures that trimming is completed when required. In some situations, this could extend outside of the right-of-way.

The right-of-way for the 72 kV transmission line would be 14 meters (7 metres on each side of the structure). Areas where the right-of-way overlaps with private property will require an easement between EPCOR and the property owner. You will be contacted directly if your property overlaps with the right-of-way. There are no development restrictions outside of the right-of-way.

This project would require changes to the Namao Substation. If approved, the substation fence will be expanded approximately 15 metres to the west (as shown in green). Two new structures would also be installed within the substation to connect the new transmission lines to existing equipment.

Planned new substation

A new substation is being planned in a new location to replace the existing Kennedale Substation, which does not have the space to accommodate the required upgrades.

We have identified a possible site at the intersection of 62 Street and 125 Avenue. If approved, the new substation will be approximately 230 by 170 metres in size and include the following major equipment:

Six (6) 240 kV circuit breakers
Two (2) 240/72 kV transformers
Four (4) 72 kV circuit breakers
Two (2) 240/15 kV transformers
Substation building

Removal of existing equipment

View information on the removal of existing transmission lines and the Kennedale Substation.

Removal of existing transmission lines

If this project is approved, the existing underground 72 kV transmission lines to the Kennedale Substation will be removed from service (shown in pink on the map). The new transmission lines will replace this infrastructure and increase the capacity and reliability of the system. The existing underground transmission lines/cables are contained in fluid filled pipes. To remove the transmission cables from service, the fluid will be drained from the pipe and the cables will be pulled out. Once the cables are removed, the pipes will be inspected and cleaned so that they can potentially be reused for other future purposes, such as containing communication cables.

Removal of the Kennedale Substation

Once the new substation is built and operating, the Kennedale Substation located at 5035 126 Ave will be removed from service (shown in yellow on the map). Once that is complete, the site will be repurposed for other EPCOR uses or prepared for sale. As a part of this work, the distribution power lines will be reconnected to the new substation. Distribution lines are the power lines that provide electricity to homes and businesses.

Approval process and proposed project schedule

Transmission projects in Alberta require approval from the Alberta Utilities Commission (AUC) before they can be built. This ensures that the transmission development is needed and planned in a way that reduces overall impacts and is in the public interest. There are two approvals required for this project: the need for the project and the routing and siting of the new facilities to be built.

There are two approvals required for this project: the need for the project and the routing and siting of the new facilities to be built.

Need for the project

The need for new transmission projects in Alberta is identified by the Alberta Electric System Operator (AESO).

The preferred option to meet the need for growing demand for electricity in northeast Edmonton is to build a new substation, new 240 kV transmission lines and new 72 kV transmission lines.

The AESO submitted their Needs Identification Document (NID) Application to the AUC for approval in December 2023. The AUC is currently reviewing that application (proceeding number 28633).

For more information on the AESO and the need for this project contact:

Phone: 1-888-866-2959
Email: stakeholder.relations@aeso.ca
Website: www.aeso.ca

Routing and siting

EPCOR is responsible for planning the location of the new substation and proposing route options for the new transmission lines.

Right now, EPCOR is evaluating route options for the transmission lines. This includes getting feedback from area residents, Indigenous Nations and communities, businesses and government agencies.
Once we have determined preferred and alternate route options and received direction from the AESO, we will apply to the AUC for approval. This is called our Facility Application.

The AUC will review the Facility Application and, if approved, they will also select which route to build (preferred or alternate). Once EPCOR submits its Facility Application, you can also provide feedback directly to the AUC.

You’re invited to provide feedback to EPCOR on the proposed route options
EPCOR will assess the route options based on your feedback and other considerations. We will then determine preferred and alternate route options to propose to the AUC
EPCOR will submit a Facility Application to the AUC for approval

January 2023 – Project initiation
April 2024 – Project update
September 2024 – Project update
October 31, 2024 – Deadline to provide feedback*
Winter 2024 – EPCOR will submit its application to the AUC
Fall 2025 – If approved, construction will begin
2028 – Transmission facilities built and operating

*EPCOR would like to include your feedback in our Facility Application to the Alberta Utilities Commission and can do so if received by October 31, 2024. You can still provide feedback to EPCOR after this date.

Engagement opportunities

In the upcoming months, EPCOR will be contacting homeowners, occupants, and business owners directly facing the proposed new developments to get feedback. Although we encourage anyone who has questions or feedback to contact us.

There are lots of steps in planning a new transmission development like this one and there will be opportunities to provide feedback and ask questions throughout the process.

What we heard

Public feedback is an important part of our planning process. So far, we have had over 500 conversations, which helped us refine our route options. Below is a summary of the feedback and what we did with that information.

Underground

We received inquiries on an underground route option.

In early 2023, we developed above ground route options as they are less costly for Alberta ratepayers, faster to build, and easier to access for maintenance and repairs. However, due to potential technical challenges with the above ground 240 kV line routes options, we have developed an underground option (shown in orange on the map <hyperlink to the 240kV Subpage>. This underground route will be assessed along with the above ground route options on constructability, social, economic, and environmental factors.

We will evaluate all route options in the next few months to identify preferred and alternate routes to propose to the Alberta Utilities Commission in our application. The Alberta Utilities Commission will decide which route will be built for this project taking into account a variety of factors, including costs paid by Alberta ratepayers.

Property value

We heard concerns that the transmission line would impact property value.

As a part of our project planning, we aim to identify route options that minimize potential impacts to property value. This is done by proposing options that follow existing features, such as highways and berms, and by increasing distances between the structures and residential properties when possible.

As a part of our project planning, we reached out to a third-party specialist for a property value study specific to this project. This study is being developed and information from this report will be available prior to submitting our Facility Application.

Health and Electric and Magnetic Fields (EMF)

We heard questions on EMF and health.

Power lines use power frequency (60Hz), which is classified as extremely low frequency EMF. This is the same frequency used by most household appliances and the wiring in your home. In Canada, Health Canada monitors the science on electric and magnetic fields (EMF), conducts research on potential health effects, and contributes to the World Health Organization’s research on EMF. The position of Health Canada is: The potential health effects of extremely low frequency EMF has been studied extensively. While some people are concerned that long term exposure to extremely low frequency EMF may cause cancer, the scientific evidence does not support such claims. —Health Canada 2022

To provide additional information, we reached out to a third-party specialist to provide a summary of the research and to develop projections for both aerial and underground options. The results show that the projected electric and magnetic fields for this project are well below the exposure guideline levels recommended for the general public. View additional information by Exponent Health and Scientific entitled Electric and Magnetic Fields and the City of Edmonton Transmission Reinforcement (CETR) project.

Cost

We received questions about increases to power bills and the cost of the project.

The Alberta Electric System Operator oversees the planning, maintenance and operation of the transmission grid and the cost for this is paid for by all Alberta electricity consumers. These costs are identified as the transmission charge on your power bill and includes costs associated with system projects such as the City of Edmonton Transmission Reinforcement Project. To find out more about transmission costs in Alberta you can contact the AESO at 1-888-866-2959 or stakeholder.relations@aeso.ca.

Transmission development is regulated by the Alberta Utilities Commission to ensure reasonable rates along with safe and reliable service. With this in mind, EPCOR plans projects to minimize costs to ratepayers.

Please note, these estimates are provided at a feasibility study level and may change as planning progresses. For this project, it is estimated that an underground 240 kV route would cost approximately $65 million more than an above ground transmission line route. Cost is just one of the factors we consider when selecting preferred and alternate routes. It is also a factor the Alberta Utilities Commission considers when deciding which route to approve.

Safety

We heard general safety concerns, including proximity to Yellowhead Trail and fire risk.

EPCOR puts safety first in everything we do. We are working with the City of Edmonton to identify areas near Yellowhead Trail that may require mitigation measures, such as a barrier system. We will follow all required design guides and roadway requirements.

Specific impacts, including potential traffic disruptions, would be identified ahead of construction. EPCOR will work closely with the City of Edmonton to mitigate construction impacts as much as possible.

We heard concerns about increased fire risk. We do not anticipate increased fire risk as a result of the proposed above ground transmission line. Sparks may occur if vegetation comes in contact with a power line. To prevent this, EPCOR has a tree vegetation maintenance program to ensure branches and other vegetation remains a safe distance from the wires.

Environment

We received questions about potential impacts to the environment and recreational areas.

Environmental assessments for this project are underway to identify potential impacts. These assessments will be used to create an Environmental Protection plan, which contains site specific mitigation measures. We also aim to minimize impacts by identifying route options that follow existing linear developments such as roadways, berms and trails. We heard concerns about impacts to trails and recreational areas. Potential impacts to recreational areas will be assessed to develop the appropriate mitigation measures. We do not anticipate impacts to recreational areas and trails once the transmission lines are constructed.

Maximize distance from residences

We heard feedback to increase distances from residential properties.

We have provided various route options that maximize distances from residences. We worked with the City of Edmonton to find solutions to remain as close to Yellowhead Trail as road allowances and safety would allow.

Noise

We heard questions about noise from the transmission line.

Generally, noise is not noticeable from a 240 kV above ground transmission line. You may hear a faint buzzing noise from the line during rainy weather, however it is typically only audible within the right-of-way corridor.

Visual impacts

We received questions about what the transmission line would look like.

To show what the transmission lines could look like, visual renderings were completed at various points along the route options.

View visual renderings.

Power outages

We heard concerns about power outages.

During construction, temporary power outages may be required to allow us to complete the work safely. The timing and extent of outages would be determined prior to construction. We understand outages are an inconvenience and we will work with affected customers to minimize the impact of the outages and ensure customers are notified in advance.

Property value

We heard concerns that the transmission line would impact property value.

Cost

Transmission development is regulated by the Alberta Utilities Commission (AUC) to ensure reasonable rates along with safe and reliable service. With this in mind, EPCOR plans projects to minimizes costs to ratepayers.

High level cost estimates for the project are provided here. The first shows the estimated cost with above ground transmission route options and the second estimate shows the cost with an underground 240 kV route option. A 240 kV underground route option was developed due to potential technical challenges with the above ground route options. The 72 kV transmission line does not have the same constraints, therefore we are not considering an underground 72 kV option at this time.

Please note, these estimates are provided at a feasibility study level and may change as planning progresses. Cost is just one of the factors we consider when selecting preferred and alternate routes. It is also a factor the Alberta Utilities Commission considers when deciding which route to approve.

Health and Electric and Magnetic Fields (EMF)

We heard questions on EMF and health.

Maximize distance from residences

We heard feedback to increase distances from residential properties and place the route near industrial/commercial areas.

We have provided various route options that maximize distances from residences. This includes retiring the route option along 127 Avenue. The current route options follow existing distribution lines, fence lines and roadways in commercial and industrial areas.

Visual impacts

We received questions about what the transmission line would look like.

To show what the transmission lines could look like, visual renderings were completed at various points along the route options.

View visual renderings.

Noise

We heard questions about noise from the transmission line.

Generally, noise is not noticeable from a 72 kV transmission line. You may hear a faint buzzing noise from the line during rainy weather, however it is typically only audible within the right-of-way corridor.

Questions and feedback

We want to hear your questions or feedback.

Contact EPCOR

Phone: 780-412-8800
Email: CETR@epcor.com
Online form: Provide feedback

Glossary of terms

There can be many technical terms used to describe electricity projects. We do our best to not use technical language but here are some common definitions to help understand this project.

Transmission lines: Transmission lines are larger scale power lines that carry electricity from Substation to substation.

Distribution lines: Distribution lines are medium-voltage power lines that run throughout the city. Their voltage can range between 2,400 to 25,000 volts. Distribution lines are mainly underground in newer neighbourhoods and above-ground (pole-mounted) in older urban neighbourhoods.

Substation: This is an electricity station that converts electricity from higher voltage power lines (transmission lines) to lower voltages that can be safely distributed to homes and businesses in the area through distribution lines.

AESO: The Alberta Electric System Operator is an independent, not-for-profit agency in Alberta that plans and expands the electrical grid by working with industry partners and the government to make sure reliable power is there when you need it.

AUC: The Alberta Utilities Commission is an independent, quasi-judicial agency of the province of Alberta who is responsible for making decisions about applications to construct, operate, upgrade and decommission electric transmission and distribution power lines that deliver electricity to Alberta homes and businesses. The AUC ensures that applications fit the electricity plan developed to meet the electricity need and forecast set by the Alberta Electric System Operator. It considers the public interest and the social, economic and environmental impacts from its decisions about proposed transmission lines.

EMF: Electric and magnetic fields (EMFs) are invisible areas of energy that are associated with the use of electrical power and various forms of natural and man-made lighting. After more than 40 years of research that includes thousands of studies and numerous reviews by health agencies, Health Canada and the World Health Organization have concluded that typical exposures to EMF from overhead power lines does not have any known health consequences.

We are getting an EMF study completed which will include a summary of the research on EMF and projections for both the 72 kV and 240 kV transmission lines. If you would like to receive this information when it is available, we can add you to the distribution list.

Voltage: In common terms, this is the ‘pressure’ of the electricity being measured. The typical home has a 120 & 240 volt electrical service. A kilovolt (kV) is 1,000 volts. The voltage of the power lines on the power poles behind people’s homes are 15kV or 25kV. The transmission lines being proposed in this project are double-circuit 72kV and 240kV power lines.

Facility application: This is the application package that EPCOR will submit to the Alberta Utilities Commission to request permission for construction of the project. It will contain a preferred and alternate routes for the proposed power lines as well as a record of the public consultation program. The Commission will decide whether or not to approve the project based off this package as well as other public input it may receive.

Public hearing: After EPCOR completes community consultations and submits its Facility Application, the Alberta Utilities Commission will determine if a public hearing is required. If needed, this is a public meeting where impacted stakeholders can address Commission officials to register concerns they may have with the project.