Construction Info

The Construction Process

There are several stages to the construction process. This page will let you know what to expect during the construction of the ATP.

The technique and duration of construction activities will vary depending on the terrain and contractor as necessary.


Prior to beginning construction activities, survey crews walk every mile of ATP route to mark construction locations and right-of -way (ROW) limits in accordance with the approved Environmental Protection and Construction Plan (EM&CP).

The survey crews will use different colored flags and stakes to identify resources and landmarks such as:

  • sensitive natural resources such as wetlands and streams
  • rare, endangered, or protected animals, plants, and habitats
  • property boundaries and encroachments
  • roadways and work areas

The surveyors record all of their findings and crews use this information to minimize the impacts of construction on our neighbors and the environment.

Corridor Clearing and Preparation

Crews may begin clearing the ROW after survey delineation. This process involves:

  • mowing or laying down timber mats for temporary access ways
  • removing vegetation and trees capable of growing into the transmission lines and "danger trees" that could fall into the lines
  • "side-trimming," or trimming trees on the clearing boundary to remove any branches that extend into the mandatory clearance area or that could threaten the lines
  • removing and/or chipping cleared trees and vegetation
  • mowing access roads and areas around new structure locations

Access Road Development

Existing roads will be used where practical. Where necessary, new access roads will be constructed preferably within the ROW. After construction is complete and the area is completely rehabilitated, we will restore roads and entrances per permit requirements unless they are necessary for permanent access to the ROW. Strict run-off controls will be in place and managed throughout the project.

Foundation Installation

Structure types and heights are based on the unique engineering requirements for each project location. The structures that will be used for the ATP are steel monopoles and will either be direct embed or erected on concrete foundations. For structures with foundations, concrete will be delivered by truck.

Erecting Structures and Stringing Conductors

Once foundations are in place, construction crews will erect the structures within the ROW. Steel poles will be assembled using a truck-mounted crane and then lifted onto the foundations.

Next, insulators and attachment hardware will be installed and stringing sheaves (rollers or blocks) attached to the insulators. The conductors will be strung by attaching the conductor to a steel line and pulled through each structure’s stringing sheaves under tension to keep the conductors well off the ground.

Conductor pulling sites located along the ROW will provide space for tractors, trailers with spools of conductor, and tensioning equipment.


After all construction activities have been completed, ground cover and vegetation is encouraged to grow back. Good construction practices will be used to stabilize disturbed soils to promote re-vegetation and progress will be monitored. If any damage occurs to roads, they will be restored to their original state.

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