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SE Substation > Overview
On March 1, 2022, ENMAX Power filed the Facility Application with the AUC for the ENMAX Southeast Substation Safety Enhancement Project. The application has been assigned proceeding number 27193. ENMAX Power’s application identified the No. 32 Substation option as the preferred option and the No. 45 Substation options as the alternate option. On August 30, 2022, the Alberta Utilities Commission (AUC) approved the option to replace the equipment at No. 32 Substation and to implement the 350-year flood mitigation measures (bank armouring and self-launching apron design. AUC Decision 27193-D01-2022.
The existing control building currently located at the northwest corner of the substation will be replaced with a new building positioned at the northeast corner of the substation. This new building will include all new equipment and house a portion of the existing switchgear currently located outside. This work is expected to be fully contained within the existing substation fence line and legal boundary.
Additionally, ENMAX will complete flood mitigation work at No. 32 Substation to protect the west bank from further erosion and high flood waters to ensure the continued safe and reliable operation of the facility. ENMAX is proposing two flood mitigation concepts for the AUC’s consideration.
Flood Mitigation Option #1: Steel Sheet Pile Wall A steel sheet pile wall will be constructed along the riverbank, to provide additional protection along the Bow River. This also includes constructing concrete tie-ins between the sheet pile wall and existing lock block flood berm at the north and south ends of the sheet pile wall. ENMAX does not anticipate being directly in the Bow River for this work to be completed, and ENMAX will obtain all municipal, provincial and federal approvals that are necessary to facilitate the flood mitigation work.
Flood Mitigation Option #2: Bank Armouring and Self-Launching Apron Riprap armouring (rocks) will be added between the existing groynes to reinforce the riverbank protection, and a self-launching apron (rock bed) will be built along the substation riverbank to provide additional protection for the substation. For this option, ENMAX will be required to work within the Bow River and will obtain all municipal, provincial, and federal approvals in advance of construction.
For this option, ENMAX would construct a new substation with a new 800 metre transmission line to connect to the current transmission system. The new No. 45 Substation would be located approximately 800 metres northeast of 24 Street SE and Quarry Park Blvd SE and would include:
For this option, ENMAX would also complete flood mitigation work at No. 32 Substation. ENMAX proposes the same two options for flood mitigation but this work would be built to withstand a one in a 100-year flooding event, as there will be less equipment to protect at the No. 32 Substation.
Construction of the No. 32 Substation option is anticipated to begin in Q1 2025. Project construction is anticipated to take approximately 22 months with a proposed in-service date of Q4 2026.
If you have any questions or wish to discuss this project, please contact us:
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ALBERTA UTILITIES COMMISION (AUC)
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