ENMAX is proposing to construct a new substation that will include:

• a new substation building;
• one outdoor 50 MVA 138/13.8kV transformer;
  
• four outdoor 138kV breakers; and
• medium voltage air-insulated switchgear and associated auxiliary, protection and control systems located inside the building.

New and existing transmission lines for Substation 45

A new transmission line is required as part of the preferred option to connect the new substation to the transmission system. ENMAX proposes to install 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 circuit tangent monopoles, will range from approximately 20 to 40 metres in height. In addition to the eight monopoles, two A-frame structures will be installed within the substation fence line and will range from approximately 15 to 20 metres in height. Three existing wood transmission poles (wood poles) on transmission line 138-31.84L will be replaced with two single circuit and one double circuit dead-end steel monopoles ranging from approximately 20 to 30 metres in height.

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ENMAX is proposing to modify and upgrade the existing substation, including:

• expansion of the existing substation fence line to the west;
• a new substation building;
• an addition of one new outdoor 50 MVA 138/13.8kV transformer;
• replacement of one existing 30 MVA 138/13.8kV transformer with one new 50 MVA 138/13.8kV transformer;
• one new outdoor 138kV breaker; and
• medium voltage air-insulated switchgear and associated auxiliary, protection and control systems located inside the building.

Modifications of existing transmission lines for Substation 31

A new wood transmission pole on transmission line 138-9.80L will be installed outside No. 31 Substation. This new pole will be a single circuit double dead-end wood pole with anchor wires, approximately 30 metres in height.