High River and Okotoks Transmission Project

AltaLink submitted a Facilities Application for this project to the Alberta Utilities Commission (AUC) for review in July 2012. The High River and Okotoks Transmission Project and Okotoks to Janet Project were included in the same joint application titled Foothills 138 kV Project. The AUC approved the project on October 7, 2013. Thank you for participating in our consultation process – your input is important to us.

The High River and Okotoks Transmission Project is part of an area transmission development called the Foothills Area Transmission Development (FATD). This development includes new transmission lines and upgrades to the electric system in Calgary and the communities south and east of the city. The majority of the transmission system in the area was built in 1985, since that time the population and industry has grown substantially. These projects will ensure power from new generation plants, including wind power from southern Alberta, is connected to Alberta's electric grid and maintain a reliable supply of electricity to support the growth and demand in this area.

The approved project includes:

  • building approximately 15 kilometres (nine miles) of new double circuit 138 kV (138,000 volts) transmission line, from the approved Foothills Substation (located east of High River) to the existing High River Substation (located north of High River)
  • building approximately 800 metres (half a mile) of new double circuit 138 kV transmission line to connect the existing 911L transmission line to the existing Okotoks Substation
  • building a segment of new single circuit transmission line to connect the 727L tranmission line to the existing 911L tranmission line
  • rebuilding approximately seven kilometres (four miles) of the existing 727L transmission line from single to double circuit
  • decreasing the voltage on a segment of the existing 911L transmission line
  • adding new 138 kV equipment to the approved Foothills Substation, and to the existing High River and Okotoks substation

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Helicopter work and implosive connectors

If you live or work near the project, you may notice a helicopter flying in the area and hear some loud explosive sounds over the next few weeks and months. Helicopters are used to move sections of transmission structures from assembly yards to designated locations on the right-of-way. Helicopters are also used to string the new transmission structures with conductor (wire).

During the wire stringing process we will be fusing portions of wire together using implosions. The implosions do not pose a safety risk to surrounding residences; however, they will emit a loud explosive sound. There should not be more than a few loud explosive sounds on days when this work is scheduled to occur. This work will be completed during day light hours only.

For more information about helicopter work and implosive connectors, please click here.

January 2015
Construction update postcard - helicopter work and implosive connectors
October 2014
Construction update newsletter
July 2014
Project update: High River Substation
Updated map: High River Substation
May 2014
Construction update postcard
November 2013
Detail photo (DP) map of approved project
Detail base (DB) map of approved project
October 2013
Notice of project approval
December 2012
Notice of application amendment
Updated map
July 2012
Notice of filing
Detail photo map
detail base map
June 2012
Transmission route update
Detail photo map
February 2012
Newsletter Volume 2
Detail base map
Detail photo map
Foothills Area Transmission Development Overview Map
November 2011
Open house information panels
October 2011
Volume 1 newsletter
Detail base map
Detail photo map
Newsletter insert - compensation and construction
AESO need overview
Public involvement in needs or Facilities Applications
Good neighbours
A dialogue on electric and magnetic fields

Project Status:

Anticipated Project Schedule

Summer 2014 Start Construction
Fall 2015 Complete Construction

Although we attempt to follow the anticipated project schedule, it is subject to change. We will continue to provide you with updated schedule information as the project progresses.

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