Stages of Construction

240/500 kilovolt Steel Lattice Transmission Line Construction

The Typical Stages of Transmission Line Construction Include:

Transmission line construction requires a large workforce and significant materials and equipment. Different stages of construction activities will occur during varying time periods depending on your location along the transmission line right-of-way.

1

Workspace area 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 and assembly yards.

2

Structure foundations

Foundations are typically constructed by drilling screw piles into the ground (similar to advancing a screw into a block of wood) and installing steel caps. Some areas may require concrete foundations based on soil conditions.

3

Structure assembly

The majority of structure assembly takes place at designated assembly yards. Some assembly will be conducted at the structure site.

4

Structure erecting

Helicopters or cranes lift sections of the structure into place. Using helicopters reduces environmental impacts and speeds up construction time. The structure sections are secured together.

5

Structure stringing

Transmission line wire (called conductor) is delivered and attached to the structures. A helicopter may be used to string the structures.

6

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.

7

Reclamation

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

8

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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