Ellerslie to Clover Bar Reinforcement

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Overview

The Alberta Electric System Operator (AESO) has requested AltaLink reinforce the transmission system between the Ellerslie and Clover Bar substations in the Edmonton and Sherwood Park areas.

Project Details

Ellerslie 89S substation

• An existing 240 kV (240,000 volts) transmission line, named 947L, was de-energized
      from the electric system between the East Edmonton substation and the Ellerslie
      substation in 2007. The proposal is to re-energize this portion of the line and connect
      this circuit to separate breakers in the Ellerslie substation with new wires from the first
      tower structure. This work will be within the existing substation fenced site.

East Edmonton 38S to Clover Bar E987S substations

• The existing transmission line, named 783L/915L, between the East Edmonton
      and Clover Bar  substations is a double circuit line, with one circuit energized
      at 240 kV and the other at 138 kV. The circuit that is currently energized at
      138 kV will be energized at 240 kV.
• An existing single circuit transmission line, named D998L, south of Clover Bar is
      currently not energized and will be energized at 138 kV. Maintenance to be
      done on the D998L includes replacing two structures on each side of the North
      Saskatchewan river with taller steel lattice towers. Other structures may also be
      replaced.
• The East Edmonton substation will require a new breaker and two new steel poles.
      This work will be within the existing substation fenced site.

Clover Bar E987S substation

• Approximately 150 metres of new 240 kV line and three steel lattice towers will be built
      on a newright-of-way to the north of the Clover Bar substation.
• The Clover Bar substation will require new breakers and a 240 kV transformer.
      EPCOR will be completing this work at the Clover Bar substation.

Project schedule

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