Wednesday, March 21, 2018


Scope of Work
Cianbro and Irby Construction are constructing/upgrading 230 miles of transmission line known as the Central Loop as part of the Maine Power Reliability Program (MPRP) which is a major upgrade to Central Maine Power Company’s bulk transmission system. The upgrade includes 345 kV, 115 kV, and 34.5 kV conductor and static lines with thousands of wood h-frame poles, steel mono-poles, steel three-pole angle structures and lattice structures.

Project Details
  • Construct new transmission lines as well as rebuild existing lines
  • Coordinate construction of the lines with outage schedules and substation construction
  • Perform work on energized lines to minimize any power disruption as needed
  • Identify, maintain and restore access routes and place temporary timber mats through rights-of-way (ROW)
  • Receive, store and distribute all owner- and contractor-furnished materials
  • Perform probing, blasting, and rock removal for each pole and anchor location and install rock anchors
  • Erect each pole structure including moving the pole out to the ROW, framing, digging and setting the structure
  • Pull ropes, install conductor, install OPGW/OHSW 
  • Perform sagging, dead ending, clipping in, splicing, and coordination with helicopter crews
  • Be responsible for environmental controls 
  • Demolish old transmission lines
The magnitude and sensitive nature of this project requires Cianbro | Irby team members and subcontractors to undergo extensive orientation before they are allowed to perform work in CMP’s transmission corridor.

Unique Challenge

Due to the magnitude and sensitive nature of this project, emphasis has been placed on safety, environmental protection, community relations and quality control. The team has established a comprehensive Environmental Awareness and Compliance program to ensure Maine’s natural resources are protected. Timber mats will be strategically placed to accommodate the work while avoiding or minimizing impacts to sensitive environmental areas such as wetlands, vernal pools, salmon streams, and indigenous plant and wildlife habitats. Additionally, the movement of materials and equipment is imperative to the success of the project. As a result, Cianbro | Irby have a headquarters located centrally to all project locations in Lewiston, ME and work is performed and managed from two field locations which include laydown yards for material and equipment.

Project Information

Central Maine Power Company

Type of Project:
Electrical Transmission & Distribution

Construction Schedule:
Start: January 2011
Complete: January 2015

The project spans a distance of 230 miles from Rumford in the Northwest to Pownal in the South and Windsor to the East in the State of Maine
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