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.


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.


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.


Structure assembly

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


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.


Structure stringing

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


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.



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.



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

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