City of Edmonton transmission reinforcement FAQ

A: The numbers listed on the map indicate points where the path of the route can change or connect to the next segment. There are multiple combinations and possible route options. These connection points/numbers are included to help stakeholders identify which route they think is the best option, segment by segment. 

A: EPCOR takes seriously its commitment to health, safety and our environment, as well as to our customers. As part of this project, we review a number of aspects and carry out assessments that will enable us to arrive at more refined route options and address public feedback. For example, we engage experts to look at matters related to health, property value and environmental aspects. We invite you to contact us if you have specific feedback or questions, and we will follow up with you to address them.

A: The 240 kV route option on the south side of Yellowhead Trail is located primarily on the north side of the berm. The berm will remain, as will the walking trail. It is safe to walk near and under power lines and there are many areas within cities where transmission line right-of-ways/easements are paired with multiuse recreational trails. If this location is selected as one of our refined route options for the 240 kV transmission line, it will be included in the environmental impact assessment as part of the project planning. We don’t anticipate any long-term impacts for users of this walking trail after construction.

A: As multiple route options remain under consideration, we do not yet know the specific number or locations of the poles. We are actively working on identifying pole locations along the proposed route options. As part of efforts to limit potential impacts, EPCOR aims to reduce the number of structures on private property by using existing road corridors and other public lands. The final number of poles needed will not be determined until a final route is selected. 

A: In an urban setting such as Edmonton, it is challenging to find route options that would completely avoid residential areas. However, EPCOR does look to limit potential impacts in a number of ways, including through the use of existing linear disturbances such as roads and rail lines. We consider factors such as the environment, cost, visual aspects, proximity to residential areas and constructability in an effort to find routes with the lowest overall impact. 

Right now we are in our consultation stage, gathering feedback to find the most suitable route for each of the 72 kV and 240 kV requirements and assessing each route based on a number of considerations, including social, economic and environmental aspects. Each route has its own merits and our approach is to find the most suitable options by balancing these considerations. 

A: A number of reasons exist why the current route options include above ground infrastructure. Above ground transmission lines cost less for Alberta ratepayers who will cover the costs of this project, if approved. They are also faster to build, which could see us address the need more quickly and avoids a prolonged construction period. Compared to underground infrastructure, above ground lines are also easier to access to complete maintenance or repairs, enabling us to potentially restore power faster for customers in the event of an outage. 

Underground transmission lines need to be placed in concrete duct banks, which would involve significant and more disruptive excavation work. Additionally, an underground double circuit transmission line would require two separate duct banks to prevent the cables from overheating, which would require more space and cost Alberta ratepayers much more money to build. In urban areas like Edmonton, space to install these types of duct banks is limited. For these reasons, the current proposed routes include above ground double circuit transmission lines, which are two transmission lines along one route strung mostly on one set of structures. It is important to note though that these are preliminary route options, and refinements will occur based on a number of factors, including public feedback. 

A: The route described is one of the potential options available for public feedback. We can definitely appreciate that this area has experienced a lot of construction in recent years, with the Yellowhead Trail widening and Fort Road expansion. Our project team has been in contact with the City of Edmonton to discuss the Yellowhead Trail conversion project. 

This transmission project still needs approval from the Alberta Utilities Commission before any construction could begin, so the timing for potential construction may not align with the Yellowhead Trail work.  However, EPCOR is committed to the communities where we work and looks for ways to reduce construction-related disruption or coordinate work with others, including the City of Edmonton, where possible.

A: The Alberta Electrical Utility Code specifies safe limits of approach to electrical lines (the wires on top of the structures). For 240 kV lines, the safe limit of approach distance is five metres. Because these lines are proposed to be suspended in the air, this clearance will be met by their distance to the ground.

A: A few barriers exist that prevent us from using or expanding this infrastructure. The existing underground cables do not have the capacity necessary to meet demand in the coming years, and there isn’t sufficient space in the current right-of-way for more underground cables. Additionally, the existing lines need to be kept in service until the new ones can be built and energized. Without them, the existing power supply to the Kennedale and Namao substations would be at risk. Lastly, the existing lines connect to the Kennedale substation, which will be replaced by the proposed new substation that is in a different location.

A: We are seeking feedback on the proposed routes, including the option near the railway tracks. EPCOR’s routing and siting principles seek to limit potential impacts by following existing corridors, like the Yellowhead Trail, where possible. However, we understand the concerns about cumulative development. That feedback is taken into account as we refine our route options. Also considered in our process to arrive at those refined routes are factors such as the environment, cost, existing linear disturbances like roads and rail lines, visual aspects and constructability.

A: Although cost is one factor, EPCOR is required to balance a number of aspects as we look to refine route options ahead of submitting our Facility Application to the Alberta Utilities Commission. This includes feedback from stakeholders, and other factors such as the environment, existing linear disturbances like roads and rail lines, visual aspects, proximity to residential areas and constructability.  It is the Alberta Utilities Commission that ultimately decides if the project proceeds and, if so, on the route.

A: To connect to Alberta’s electrical grid, the proposed 240 kV line must connect to the existing transmission lines in this area. There are two options. One is to connect to the existing transmission line already in Hermitage Park (Connection Option A) and then continue south towards Yellowhead Trail to exit the park. The other connection option involves tying into the existing 240 kV line from the east side of the North Saskatchewan River next to the bridges where the eastbound Yellowhead Trail crosses the river (Connection Option B). This connection would require additional structures to be built near the river valley to support the crossing over the river. We are seeking input on these options and we welcome feedback on these connection options. EPCOR cares about the communities we work in and the environment. An environmental assessment will be done on the connection options as part of our project planning.

A: No. We review and consider all stakeholder feedback equally and weight it against the number of other factors we’re required to consider as part of this process, including social, economic, environmental and constructability aspects. Right now we are in our consultation stage, gathering feedback from all stakeholders about the most suitable route for each of the 72 kV and 240 kV transmission lines. 

A: The base of the proposed monopole structures for this line will be between 1.5-2.5 metres wide at ground level. A larger foundation will exist below ground. 

A: Yes. Decommissioning the existing 72 kV transmissions circuits and the Kennedale substation is a part of the project budget. Final cost estimates for the overall project will be available later in 2023 as part of EPCOR’s Facility Application to the Alberta Utilities Commission. 

A: If the project is approved, all the electrical equipment will be removed from the old Kennedale substation, including both outdoor and indoor equipment and the site prepared for sale or re-deployment for other EPCOR use. This would occur after the new facilities are built and operating.

A: Safety remains our top priority. A shield wire(s) runs along the top of the transmission line, above the other conductors. The shield wire(s) serves to intercept lightning strikes and provides a path for the electrical current to travel safely to ground, protecting the main conductors, and preventing damage to equipment and the surrounding area. As elevated objects, shield wires are more likely to intercept lightning that may otherwise strike a lower lying area or structure/building but do not attract additional lightning. 

A: The electrical current travelling through transmission line conductors can induce voltage in metal objects, particularly those that are long and parallel to the transmission line route such as rails. This can be mitigated by grounding these objects, where necessary. As part of the design phase of this project, we have contracted an independent company to complete an induction study. The purpose of the study is to identify potential areas where induction may occur and determine where mitigation is needed. Safety is our top priority, and we will work with stakeholders in places where grounding is required. 

A: EPCOR has been meeting with the City of Edmonton as a part of this project, which includes discussions on City-led projects and upcoming neighbourhood renewal. We are unaware of any circumstances that would see this project affect neighbourhood renewal. If you have questions about the neighbourhood renewal project, please contact the City of Edmonton. 

A: If there are any possible conflicts with existing infrastructure along the proposed routes for the transmission lines, including with telecom towers or equipment, EPCOR will contact the appropriate owners to discuss possible impacts and how we might address them. We cannot comment on specific locations until a final route is identified. 

A: The location where the proposed 72 kV transmission line crosses Fort Road will not be determined until a final route is identified and submitted to the Alberta Utilities Commission. We welcome public feedback on the options proposed and any inquiries about traffic impacts. If there are any traffic impacts, EPCOR will work closely with the City of Edmonton to limit impacts as much as possible. These details will be shared in advance of any potential construction. 

A: The route described is one of the potential options available for public feedback. Our project team has been in contact with the City of Edmonton to discuss the Yellowhead Trail conversion project. 

This transmission project still needs approval from the Alberta Utilities Commission before any construction could begin, so the timing for potential construction may not align with the Yellowhead Trail work.  Also, it is unlikely work on transmission power lines could be safely and efficiently executed simultaneously with the Yellowhead Trail freeway conversion project. 

However, EPCOR is committed to the communities where we work and looks for ways to reduce construction-related disruption or coordinate work with others, including the City of Edmonton, where possible.

A: We understand that construction can present challenges or cause disruption at times, although EPCOR does plan its work in a way that seeks to limit impacts, where possible. If approved, construction is planned to begin in late 2024 and continue into 2026. We will provide customers affected by construction with more detailed information in advance. All work spaces for the project will be safe and secure, and construction activities will comply with City of Edmonton bylaws, Occupational Health and Safety requirements, and our strict health, safety and environment program. Exact details would not be known until closer to construction. 

A: We will work with the required agencies to ensure that we meet or exceed all roadway requirements, including any safety-related clearances and/or guardrails, for transmission line development near roadways. 

A: Multiple options exist for stakeholders to provide input as we strive to answer all questions and collect as much input as possible. You can provide feedback in a way that works best for you - and that can be through phone, email, the mail-in paper feedback form and by setting up a meeting with us. We also plan to have an in-person open house in the spring/summer. All of the contact information is available at www.epcor.com/cetr. 

A: The project team reviews all feedback, regardless if contact information or an address is provided. Having some geographical references could help us categorize feedback, such as referencing a portion of the project (the proposed new substation, 72 kV transmission line, or the 240 kV transmission line) and your approximate distance from the routes/proposed substation site. EPCOR must seek approval for the proposed project from the Alberta Utilities Commission (AUC), the independent regulator responsible for assessing the project. The process requires that EPCOR file an application that includes stakeholder feedback. All stakeholder feedback, including feedback submitted anonymously, will be included in EPCOR’s application. However, if a stakeholder wishes to actively participate in the AUC application, they will be unable to remain anonymous. 

We also plan to have an in-person open house for this project, which is currently planned to occur in the spring/summer 2023. This would be another opportunity to provide feedback without providing personal information as you would not be required to provide a name. Details on the open house will be provided in our next project update notice. 

A: The AESO is responsible for planning the transmission system, including identifying the need for transmission system development. The AESO does not oversee actual costs of projects. Responsibility for project costs reside with Alberta’s transmission facility owners. These costs are ultimately reviewed by the Alberta Utilities Commission, the regulator in Alberta, to ensure project costs are reasonable and in the public interest.

A: Yes, in order to continue to reliably serve the load (demand for electricity) in the area, connecting the existing 72 kV system in the area to the 240 kV system to the east is the best approach. Both 72 kV and 240 kV routes will be needed.

A: As EPCOR takes all stakeholder feedback into consideration and further defines the project, they will be able to develop detailed cost estimates. Once the detailed project costs become available, the AESO will be able to provide further information on impact to ratepayers. 

A: All electricity users share the cost of moving power though Alberta’s grid. The rates to be charged are established in the Independent System Operator (ISO) tariff and are approved by the Alberta Utilities Commission. The tariff allocates costs to all users of the transmission system based on their level of usage of the system. Based on current usage levels, around 75 per cent of cost will be paid by industrial and commercial customers and around 20 per cent by residential customers (with the remaining five per cent by farmers) spread across Alberta. 

A: Whether installed above ground or below ground, transmission lines are designed to not produce harmful levels of electric and magnetic fields when installed above ground or magnetic fields below ground (the shielding on underground lines blocks the electric field).

A: The frequency of the EMF from transmission lines (60 Hertz) and other electrical devices supplied with electricity is far below those used for communications like radio, television, cellular or Wi-Fi, which have frequencies of millions of Hz (“Megahertz”) or billions of Hz (“gigahertz”). So, just as you cannot use an FM radio to receive a TV station, common residential communications, including those of mobile wireless 4G and 5G mobile phones, will similarly not be entirely affected by the electric or magnetic fields from transmission lines.

*There may be instances where transmission lines may cause some interference with AM radio, however, this typically only occurs in close proximity to higher voltage transmission lines.