British Columbia, Canada
BC Hydro
Start Date

BC Hydro’s Site C Clean Energy Project will be a third dam and hydroelectric generating station on the Peace River in northeast British Columbia, Canada.

The diversion tunnels contain of twin 750 m long and 11 meters in diameter tunnels that have being carried out using 4 roadheaders (150 Tons each) at the same time, under extreme weather conditions (temperatures below -40ºC) and integrating very demanding silica exposure control methods. The lining of the tunnels includes pouring of 2 m concrete using a 12 meters long custom-built slip form, full-round, creating a perfect circle.

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Detailed Overview

Project Highlights

The project design for the Site C Clean Energy Project includes the following key components:

  • Access roads in the vicinity of the site and a temporary construction access bridge across the Peace River at the dam site.
  • Construction of two temporary cofferdams across the main river channel to allow for construction of the earthfill dam.
  • Worker accommodation at the dam site, with other workers being housed off site and in the region.
  • The realignment of six segments of Highway 29 over a total distance of 30 kilometres.
  • Shoreline protection at Hudson’s Hope.
  • Two new 500 kilovolt AC transmission lines that will connect the Site C facilities to the existing Peace Canyon Substation, along an existing right-of-way.
  • An 800-metre roller-compacted-concrete buttress to enhance seismic protection.
  • An earthfill dam, approximately 1,050 metres long and 60 metres high above the riverbed.
  • A generating station with six 183 MW generating units.
  • An 83-kilometre-long reservoir that will be, on average, two to three times the width of the current river.
  • Site C will provide 1,100 megawatts of capacity, and produce about 5,100 gigawatt hours of electricity each year — enough energy to power the equivalent of about 450,000 homes or 1.7 million electric vehicles per year in B.C.
  • It will be a source of clean and renewable electricity for more than 100 years.
  • Site C will have among the lowest GHG emissions, per gigawatt hour, compared to other resource options.
  • As the third project on the Peace River, Site C will rely on the existing Williston Reservoir for water storage. This means Site C will generate about 35 per cent of the energy produced at the W.A.C. Bennett Dam, with only five per cent of the reservoir area.
  • Site C will be among the most cost-effective resource options for our ratepayers.
  • Site C will create about 13,000 person-years of direct employment during construction.
  • Construction also provides significant opportunities for businesses of all sizes.
  • Construction will contribute $3.2 billion to provincial GDP, including approximately $130 million to regional GDP.
  • During construction, Site C will result in a total of $40 million in tax revenues to local governments and, once in operation, $2 million in revenue from grants-in-lieu and school taxes.
  • Site C will be a source of affordable power to meet B.C.’s future electricity needs, and we expect to require the energy and capacity from Site C by about 2030.

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