ENMAX Power Corporation

SE Substation and Transmission Line Development

OVERVIEW

ENMAX’s preferred option is to build a new substation,ENMAX No. 45 Substation. As part of the preferred option, ENMAX would construct and modify the existing transmission infrastructure on 24 Street SE near the community of Quarry Park to connect ENMAX No.45 Substation to the transmission system. ENMAX No. 45 Substation would be located approximately 800 metres northeast of 24 Street SE and Quarry Park Blvd SE.

ENMAX’s alternate option would include expanding the existing ENMAX No. 31 Substation, located at 3515 80 Ave SE. As part of the proposed upgrades, ENMAX would construct and modify the existing transmission infrastructure located at ENMAX No. 31 Substation.

PREFERRED OPTION: PROPOSED NEW SUBSTATION 45

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.

ALTERNATE OPTION: PROPOSED SUBSTATION 31 EXPANSION

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.

PREFERRED AND ALTERNATE OPTIONS: EXISTING NO. 32 SUBSTATION

For both the preferred and alternate options, ENMAX will remove the existing outdoor switchgear from No. 32 Substation. One outdoor transformer will be removed from service but will remain at the No. 32 Substation site as a spare. The buildings and other outdoor equipment at No. 32 Substation will remain, and the substation will continue to be operational.

Substation 32

CONSTRUCTION METHODS

Temporary access accommodations and road closures may take place periodically during construction. ENMAX will work with stakeholders and the City of Calgary to minimize the impact to residences, businesses, and commuters in the area. There are no power outages impacting customers planned as part of this project.

NOISE IMPACT ASSESSMENT

As part of the application to the Alberta Utilities Commission (AUC) for the project, ENMAX is required to fi le a noise impact assessment that meets the requirements of AUC Rule 012: Noise Control (Rule 012). This noise impact assessment indicates predicted sound levels after the project is operational are expected to be below the AUC’s permissible sound levels.

Contact Us

If you have any questions or wish to discuss this project, please contact us:

ENMAX POWER CORPORATION stakeholderrelations@enmax.com
403-514-1471

ALBERTA UTILITIES COMMISION (AUC)

403-310-4282
info@auc.ab.ca
www.auc.ab.ca

Quick Fact

For more than 100 years, ENMAX and its predecessors have delivered safe and reliable electricity in Calgary.

Customers are free to purchase natural gas services or electricity services from a retailer of their choice. For a list of retailers, visit ucahelps.alberta.ca or call 310-4822 (toll free in Alberta).

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