The Alberta Utilities Commission is currently considering an amended application from the Alberta Electric System Operator (AESO) for approval of the need to upgrade and maintain reliability of the electric transmission system in East-Central Alberta to serve load growth, and provide options for generation connection in the future. The needs identification document the AESO submitted indicates that the transmission upgrade is needed between Provost and Edgerton and from Nilrem to Vermilion.
The AUC issued the notice of hearing on July 27, 2018. A revised proceeding schedule with an amended hearing date was sent out on October 24, 2018.
The Commission referred the original application back to the AESO on January 12, 2018, following a full written proceeding in Decision 22274-D01-2018, requesting that it incorporate the most current load and generation forecasts into the analysis of the area. The AESO reassessed the need for transmission reinforcement in the Provost to Edgerton and Nilrem to Vermilion area based upon its most current load and generation forecast information and amended its application on March 26, 2018.
The transmission development proposed in the application includes the following major components:
- A new 144-kilovolt (kV) substation to be called Drury 2007S Substation, expandable to 240-kV, in the vicinity of the existing Vermilion 710S Substation (Legal Subdivision 5 and Legal Subdivision 12 of Section 32, Township 50, Range 6, west of the Fourth Meridian).
- Connect the proposed Drury 2007S Substation to the existing 138-kV transmission line 7L65 via an in-and-out configuration, renaming the segment of transmission line 7L65 between Drury 2007S Substation and Vermilion 710S Substation as 7L205.
- A new 240-kV single-circuit transmission line, to be initially operated at 138-kV, from the existing Nilrem 574S Substation (Legal Subdivision 15 of Section 9, Township 42, Range 9, west of the Fourth Meridian) to the proposed Drury 2007S Substation.
- A new 240-kV single-circuit transmission line, to be initially operated at 138-kV, from the existing Hansman Lake 650S Substation (southeast quadrant of Section 1, Township 40, Range 5, west of the Fourth Meridian) to the Killarney Lake 267S Substation T-tap point on transmission line 749AL.
- Relocate the connection of the 749AL T-Tap from transmission line 749L to the new line described above.
The AESO also proposed the following transmission development, should milestones be triggered:
- A new 240-kV single-circuit transmission line, to be initially operated at 138-kV, from the existing Edgerton 899S Substation to the Killarney Lake 267S Substation T-tap point (749AL).
The AUC must consider the AESO's assessment of the need for the development to be correct unless it is proven to be technically deficient or not in the public interest.
If the AESO's application is approved, a separate facility application will be required to seek approval for the route and specifics of the transmission lines and substation once the project has been assigned to the transmission facility owner by the AESO.
More details on the proposed project, including maps, is available from the Alberta Electric System Operator's website: Provost to Edgerton and Nilrem to Vermilion Transmission Development.
Find out how the Commission has dealt with certain issues in previously issued transmission decisions.
The eFiling System should be accessed to view the applications and the other documents the AUC will be considering in this proceeding. The system is also used to file submissions and evidence to participate in the proceeding.
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Documents being considered in this proceeding can be found in the eFiling System (which requires log in). Once you have logged in, enter 23429 in the "go to" section at the top left corner of your screen.
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