Jordanelle - Midway Transmission Project
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Heber Light & Power Projects

HL&P | RMP Transmission Line Rebuild
Updated 7-18-2018
Transmission Rebuild and Second Point of Interconnect

In 2014, Heber Light & Power and Rocky Mountain Power began working on the first phase of a multi-year project to rebuild ten miles of transmission line from the Jordanelle Dam to the Midway Substation, and to add a second point of interconnect to the Western Grid. This project will complete a transmission loop between Park City and Orem using Heber Light & Power's existing and future planned transmission and transportation corridors. Part of the project is rebuilding the south transmission line and adding 138 and 46 kilovolt lines to new reinforced poles.

Why does the Heber Valley need this?

As poles, wires, and other equipment ages it must be replaced. The line that is being upgraded for this project is over 25 years old, and the existing point if interconnect does not have enough capacity to meet growing demands. It is time to replace and upgrade.

Updating equipment allows us to better provide reliable service, but reliability also requires having options. Currently, HL&P receives up to 75 percent of its energy from a single point of interconnect to the Western Grid via the PacifiCorp owned powerline in Provo Canyon. Although rare, when weather and other unforseen events compromise the only 138 kilovolt line feeding the valley, there is a risk of a prolonged valley wide outage. Having a second point of interconnect will provide another option for receiving power supply from the grid.

Why not just rebuild the Midway Substation without rebuilding the line?

Increasing the capacity of the Midway interconnect without considering Rocky Mountain Power's ability to provide an adequate energy supply at that point would be an oversight. It is important for the Heber Valley that the transmission loop between Park City and Orem is complete so that HL&P can have a second point of interconnect to the Western Grid and have an adequate energy supply available from both directions. It is critical that we plan for the future as we see our valley continue to grow.

Looking to the Future

The joint transmission line rebuild and second point of interconnect project is only one of many projects to come. Every year, aging infrastructure must be replaced and new infrastructure must be installed. Each project strengthens our ability to sustain our community today and in the future. Maintaining reliable service and reasonable rates is possible through careful planning and careful spending.

Existing Section of the Jordanelle to Midway
Joint Transmission Line Rebuild

Questions & Answers
Why is Rocky Mountain Power part of this project?

Both HL&P and Rocky Mountain Power need this power line rebuilt for separate reasons. HL&P needs a second point of interconnect for capacity, redundancy, reliability and future power load growth. Rocky Mountain Power needs to complete a loop circuit by connecting the Park City line to the Orem line located in Provo Canyon. Working on this project jointly creates synergies and cost savings that benefit both companies and their rate payers. The existing power line is the shortest distance between the Jordanelle line and the Midway substation and it also crosses the HL&P property where the second point of interconnect needs to be located.

Can we install this line underground?

Installing a 138kV transmission line underground is a very expensive process that requires much wider easements than an overhead project. In April of 2018, NEI Electric Power Engineering Inc., completed a cost study for the project. The study provides cost estimates within 30 percent for undergrounding individual segments of the project and undergrounding the entire project. According to the study, the cost of burying the eight miles of dual circuit 138 KV 46 KV transmission is roughly $32.16M, and the cost of doing the project overhead is $7.77M. In addition, wider easements will increase the overall cost to bury.

While Rocky Mountain Power has agreed to pay most of the cost of over heading the project, the dollar amount that they will invest in the project does not change if the project is put underground. This means that if the project moves forward as an underground project, then HL&P will pay most of the joint project cost. As the cost to serve rate payers continues to increase, it is economically efficient to continue with an overhead project that will bring the most value to all HL&P customers. As time goes on, additional projects and lines will be needed in the valley and it is critical that resources are carefully spent to minimize the impact to rate payers.

When will construction begin? What is the timeline?

Construction on this line has already begun, there is a one-mile section completed on Highway 40 north of Heber. The next phase is scheduled to begin in 2018 and conclude in 2020.

Updated 6-21-2018
Please send us your questions and comments reguarding the proposed transmission. We will answer your questions as soon as possible.

Transmission Line Question and Comment Form

At the direction of the Board of Directors, Heber Light & Power hired NEI Electrical Power Engineering to study the cost of burying the proposed transmission line.

It is available for download here:

HL&P Underground Transmission Cost Study - 2018

Heber Light & Power also hired ICPE (Intermountain Consumer Professional Engineers, Inc) to perform a 46kV Load Flow Study.

It is available for download here:

HL&P 46kV Load Flow Study - 2018

Updated 6-18-2018
Below is the proposed route map and four photo simulations of the proposed transmission project with images of current conditions.

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Heber Light & Power
31 South 100 West
Heber, UT 84032
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