Stages of Construction

138 kilovolt Transmission Line Construction

The Typical Stages of Transmission Line Construction Include:

Construction of a new transmission line requires a large amount of materials, equipment and labour. Different stages of construction activities will occur during varying time periods depending on your location along the transmission line right-of-way. Construction equipment and vehicles (including bucket trucks and trailers) will also be present along the right-of-way throughout construction.

1

Workspace preparation and materials delivery

The right-of-way and structure locations must be prepared for work, including removing trees/vegetation as needed and building approaches to access the land. Foundation and structure materials are delivered to work sites.

2

Structure foundations and base assembly

Some structure bases are embedded directly into the ground and secured with gravel or concrete. Other structures require foundations, which are constructed by drilling holes and installing casings into the ground, then filling them with concrete. Structure bases are then attached to these foundations.

3

Structure erecting

Cranes are used to raise the upper sections of monopoles onto structure bases. Workers then secure the sections together.

4

Structure stringing

Transmission line wire (called conductor) is delivered and attached to the structures. Cranes or helicopters may be used to string the conductor.

5

Line work

The wires may be fused together using implosive connectors, which produce a loud explosive sound. There should not be more than a few of these explosive sounds on days when this work is scheduled to occur.

6

Reclamation

Reclamation and clean-up begins once the transmission line stringing is complete. We aim to return the land to its previous condition after one post-construction growing season.

7

Energization

Quality and safety inspections are completed and the new transmission line is energized and connected to Alberta’s electrical system.

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