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:
- a new substation building,
- a new substation building,
- four outdoor 138kV breakers; and,
- medium voltage (MV) air-insulated switchgear and associated auxiliary protection and control systems located inside the building.
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.
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NEW AND EXISTING TRANSMISSION LINES
- For the No. 45 Substation option, ENMAX will build a new 800 metre double-circuit 138kV overhead transmission line consisting of eight new self-supporting steel monopoles (monopoles). The monopoles, consisting of double circuit dead-end, single circuit dead-end, and double tangent monopoles, will range from approximately 20 to 40 metres in height. Three existing wood transmission poles (wood poles) on transmission line 138-31.84L will be replaced with one single circuit and two double circuit dead-end monopoles ranging from approximately 20 to 30 metres in height.