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​We are proposing to construct a new 72 kilovolt (kV) above-ground transmission line from the Strathcona substation (5140 99 Street) to the Dome substation (2720 Parsons Road). Have a look at our latest update.

Project update

Since September 2017, we have discussed the proposed project with over 660 stakeholders. We assessed the input we received from businesses and landowners through one-on-one consultations completed in person, at an open house, over the phone or by email. As a result of discussions with stakeholders and additional assessments of routing options, we have identified preferred and alternate routes. These changes were included in a project update package distributed to stakeholders near the project in March 2018 and are outlined in the following tabs.

Thank you to everyone who took the time to participate in the consultation process to date.

Next steps

In June 2018, we filed a facility application with the Alberta Utilities Commission (AUC) (proceeding 23641) outlining the project details and our preferred and alternate route. The public will continue to be able to provide feedback for consideration by both EPCOR and the AUC. If the project is approved, the AUC will make the final decision on routing.

Project overview

We're proposing to:

  • Construct a new 72 kilovolt (kV) above-ground transmission line from the Strathcona substation (5140 99 Street) to the Dome substation (2720 Parsons Road). The transmission line will be approximately four to five kilometres in length, depending on the route selected.
  • Add a 240 kV/72 kV transformer, 240 kV circuit breaker, and 72 kV circuit breaker; and associated switches and equipment to the Dome substation.

This upgrade will allow us to improve the reliability of our transmission system and reduce the risk of outages to our customers. As demand for power continues to grow within Edmonton, so does the need for transmission improvements like the one proposed by this project.

Dome substation upgrades

To accommodate the proposed transmission line, upgrades are needed at the Dome substation, including:

  • Adding a 240 kV/72 kV transformer, 240 kV circuit breaker and 72 kV circuit breaker with associated disconnect switches.
  • Expanding the fence at the Dome substation by approximately seven metres by six metres on the east and south sides of the substation.

The new section of fence will match the existing fence. Trees within the expanded fenceline will be removed to meet safety clearance requirements.


Transmission lines and substations

Transmission lines are like highways, moving high-voltage electricity from generating stations to distribution points (called substations) where the high-voltage electricity gets stepped down to lower voltages.

Distribution lines

Once voltages are stepped down at a substation, the electricity travels along lower-voltage distribution lines. These lines are the ones that leave a substation and make their way to our homes or businesses.

Route options

Transmission line route refinements

In an effort to find transmission line routes with lower levels of overall impact, we have refined the route options to take into consideration a variety of factors, including:

  • Input from local stakeholders
  • Health, safety and environment
  • Electrical requirements
  • Cost
  • Existing infrastructure
  • Visual impacts
  • Special constraints

Taking into account these factors, we have identified a preferred route and alternate route for the transmission line. The map below shows both routes, as well as the side of the road on which we propose to build and where we propose to "overbuild" with existing distribution lines.


Other routing options

As shown on the map above, we are considering a number of variants to the preferred route.

The new 72-kV line will need to cross three existing 240-kV transmission lines south of 31 Ave. on Parsons Road that are owned by AltaLink. For this segment, we are considering the following options:

  • Bury a portion of the new 72-kV line underneath the 240-kV lines. The section to be buried would be approximately 75 metres in length.
  • Work with AltaLink to construct a new transmission tower that will allow the new 72-kV line to cross underneath the 240-kV line as an all-aerial line. The 72-kV line would cross at a short distance east of the right-of-way (see map) in order to meet clearance requirements.

On the preferred route, we propose to build the line on the west side of 99 Street for approximately 0.7 km between 35 and 39 Ave. We are also considering a variant of the preferred route that would build this section of the line on the east side of the road.

Only one route will be built. The map shows preferred and alternate routes currently under consideration.

Please note: As a result of the route refinements, the previously proposed 33 Ave. and 45 Ave. route options have been eliminated. Going forward, stakeholders on these rejected route options will no longer receive project communications.


​Proposed structure types

We propose to build the transmission line using wood, steel or composite poles, ranging in height from approximately 18 to 26 metres. Where the proposed transmission line turns corners or has to span larger distances, non-typical poles may be required. This may include the use of guy-wires and anchors as well as larger poles with wider bases that range in height from approximately 18 to 30 metres.

The diameter of the typical structures at the grounds surface will range between approximately 0.65 to 1.0 metres. The diameter of non-typical structures will range between approximately 1.0 to 1.5 metres.

Here are examples of structures we anticipate using for this project. Note, images are not to scale.

Structure A — Transmission Only

Portions of the route will be primarily single-circuit, meaning they will have three wires strung across them and one overhead shield wire on top. This is the most common pole type.

Structure B — Transmission Only

Where aerial clearance is limited, a structure that has three wires strung to one side may be used.

Structure C — Transmission and Distribution

Portions of the routes under consideration follow existing distribution lines. For these sections, we propose to remove some of the current poles (approximately 14 metres tall) and installing new poles (as mentioned above ranging from 18 to 26 metres in height) that will have the new transmission line on top and the existing distribution line(s) underneath.

Structure D — Single-Pole Vertical Dead-End

A larger pole such as this may be used where the proposed transmission line turns corners.

Structure E — Riser Structure

Where the new 72-kV line crosses under the existing 240-kV lines, this structure may be used to convert the line from aerial to underground.

Structure F — Two-pole Double Dead-end

This structure may be used to allow the new 72- kV line to cross underneath the existing 240-kV lines without burying it.

Responding to feedback
​Throughout our discussions with stakeholders, various concerns and questions were brought forward. This section addresses the feedback we commonly heard.

What to expect during construction

If the project is approved, construction is planned to begin late 2018 and finish in late 2019. We anticipate our hours of work to be Monday to Friday from 7:30 a.m. to 5:00 p.m.; however, occasional evening or weekend work may be required. We will provide more detailed information regarding potential construction impacts prior to any work starting.

During construction, you can expect typical activity such as vehicles, equipment and crews in the area. We understand that construction impacts can be challenging; however, they are generally short-term in nature and our construction staff will work as quickly and safely as possible to minimize any potential inconvenience.

Temporary lane closures

We anticipate needing to temporarily close a lane of traffic on the side of the road where crews will be working. Our goal is to maintain access to businesses during construction. We will attempt to provide advance notice of any work in the area.

Power interruptions

During construction of the transmission line, temporary power outages may be required to allow us to complete work safely. The timing and extent of outages will be determined as we complete detailed engineering once a route is approved by the AUC. We understand this is an inconvenience to our customers, and will work with affected customers to minimize the impact of the outages and ensure customers are notified in advance.


In some areas, we may need to trim or remove trees or other vegetation near transmission poles, wires or guy lines. This is to ensure that we meet minimum safety clearance requirements per the Alberta Electrical Utility Code.

Visual impacts

We are taking several steps in routing and siting the line to reduce the potential visual impacts associated with the project. Where possible, we propose to:

  • Follow existing linear disturbances (roads, transmission/distribution lines).
  • Overbuild on existing wood pole distribution lines rather than add a separate line.
  • Build taller structures or place poles to reduce obstruction of commercial signage.


Work will create typical noise associated with construction. We will take measures to ensure we comply with the City of Edmonton's Community Standards Bylaw for Noise Control. If it's necessary to temporarily exceed acceptable noise levels, we will work with the City of Edmonton to obtain the required permits.

Concerns about potential communications interference

Some stakeholders asked about the potential impact of the project on wireless signals such as radio and television transmitters, wireless internet and cellular phone networks. We do not anticipate any interference with most types of signals resulting from the transmission line, as they are typically broadcast at much higher frequencies, whereas transmission lines are classified as extremely low-frequency (the same as household appliances and wiring). There is the potential for interference with AM radio and analog television signals; however, any potential interference diminishes significantly with distance from the line.


The Alberta Electric System Operator (AESO) is responsible for determining the proposed transmission development, which involves adding the transmission line and the equipment to the Dome substation. The AESO will submit a needs identification document (NID) with the AUC in mid-2018 in support of this project.

Our project team is preparing a facility application to be filed in mid-2018 with the AUC. Feedback we receive from stakeholders regarding the project will be incorporated as part of the facility application.

The AUC must approve the NID and facility application before upgrades to the transmission system can begin. Although we may propose more than one route, the AUC will make the final decision on routing, if the project is approved. No construction can begin until all required approvals are in place.

Regulatory process

​As we move forward, we remain committed to consulting with you about this project and welcome your comments and questions. Your feedback regarding this project is important to us and will be incorporated into the facility application that we will file with the AUC. Below is more information about who is involved in the regulatory process, and how you can get involved.


About the Alberta Electric Systems Operator (AESO)

The AESO is an independent, not-for-profit organization responsible for the safe, reliable and economic planning and operation of the provincial transmission grid. For more information about why this project is needed, please see the AESO's Need Overview, or visit If you have any questions or concerns about the need for this transmission development you may contact the AESO directly or you can make concerns known to an EPCOR representative who will communicate them to the AESO on your behalf.

For more information about the project need, please contact:

Alberta Electric System Operator
Phone: 1 (888) 866-2969

About the Alberta Utilities Commission (AUC)

Alberta’s electric utilities are regulated by the AUC. The AUC is an independent quasi-judicial agency that ensures that the delivery of Alberta’s utility service takes place in a manner that is fair, responsible and in the public’s interest. For more information about the AUC, please visit the AUC’s website.

For more information about the regulatory process and how you can participate, please contact:

Alberta Utilities Commission (AUC)
Toll-free: 310-0000 
Phone: (780) 427-4903
AUC booklet: Public involvement in a proposed utility development



EPCOR, through its subsidiaries, builds, owns and operates electrical, natural gas and water transmission and distribution networks; water and wastewater treatment facilities; sanitary and stormwater systems; and infrastructure in Canada and the United States. The company also provides electricity, natural gas and water products and services to residential and commercial customers. EPCOR, headquartered in Edmonton, is an Alberta Top 70 employer.


EPCOR respects your right to privacy. Any personal information we collect about you — including your name, address, phone number and email address — will be used only in regards to this project. In accordance with AUC Rule 007, this information will be filed with the AUC and may be available to the public through their website during the regulatory proceeding for this project. Please visit for more information about the AUC's public involvement process for proposed utility developments. View our Privacy Policy for more information.