P21G Restructuring Project

Location: Sault Ste. Marie, Ontario

Client: Brookfield Power, Great Lakes Power

Transmission Line Voltage: 230kV

Transmission Line Length: 80km

Old Structure Type: 2-Pole Wood Gulfport Type

New Structure Type: 2-Pole Composite H-Frame Type

Structures Replaced: 139

Services provided:

  • Access Mapping
  • Trail Building
  • New Structure Installation
  • Old Structure Removal
  • Material Procurement

Other Challenges:

  • 100% Offroad Construction
  • Extensive Bedrock Content
  • Steep, difficult to climb hills
  • Spotty road access

The P21G rebuild was a massive logistical challenge. Harsh terrain, tough-to-access structures, and protected species all had to be considered. This line had been decimated by area woodpeckers, and some structures were showing their age. The new fibre pole structures are fireproof, have a life expectancy around 80 years, and can’t be penetrated by woodpeckers or insects.

Project Map – Location of Full Structure Changeouts: