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New Transmission Line – Bay d’Espoir to Western Avalon

The newly built 188-kilometre, high voltage transmission line between Bay d’Espoir and the Avalon Peninsula was completed on schedule and placed into service in early December 2017, following approximately a year-and-a-half of line clearing and construction.

The addition of the new line strengthens reliability for customers on the Avalon Peninsula by relieving transmission congestion and providing more capacity to serve the region. It enhances the resiliency of the current transmission network originally built in the 1960s and also reinforces the future interconnection of the island system with Labrador.

More about the new transmission line

  • Over 1,480,000 person hours worked by 500+ Hydro employees and contractors
  • 580 steel towers assembled and erected
  • Each tower weighs 10 – 35 tonnes and contains about 1,000 bolts
  • Approximately 10,000 tonnes of structural steel used
  • On average 25 towers were erected per day

The 230kV transmission line’s  route parallels two existing transmission lines between the Bay d’Espoir Generating Station and the Western Avalon Terminal Station near Chapel Arm. This avoided the creation of  a new access corridor, minimizing the environmental footprint and impact on communities along the route.

Hydro completed significant engineering analysis, including hundreds of stability and load flow studies, to confirm that the line is necessary and that it is the best option to ensure optimal reliability levels over the long term.

The Board of Commissioners of Public Utilities (PUB) approved the project in December 2014. The project was released from Environmental Assessment (EA) by the provincial Department of Environment and Conservation in June of 2016. The EA process included a series of consultations and open houses with communities and key stakeholders along the proposed route. Several months were spent in the field analyzing a wide range of environmental and technical aspects of the project.

Previous News

April 17, 2017 – Public Advisory: Tower Installation

June 24, 2015 – Hydro completes community consultations

June 1, 2015 – Hydro holding public consultations on proposed transmission line