ACCIONA, the leading partner of Peace River Hydro Partners (PRHP), has successfully completed one of the most important technical milestones on the Site C project having finalised the construction of the two twin tunnels to divert the Peace River. Each tunnel is 750 metres long with an 11 metre diameter and once operational will channel up to 3,000 cubic metres of water per second from the Peace River.
Excavation of the diversion tunnels began in the summer of 2018 and was completed at the end of 2019. The process to line the tunnels, which used a custom-made slip form structure to ensure a perfect finish, began in the summer of 2019 and was completed this May.
The project commissioned to ACCIONA and its partner by BC Hydro involves the construction of an earthfill dam spanning more than one kilometre that rises 60 metres over the riverbed of the Peace River. The principal civil engineering contract also includes major auxiliary works such as construction of five kilometres of cofferdams and the two recently completed river diversion tunnels, as well as various temporary access roads and bridges.
ACCIONA is also constructing a 800m long to a maximum height of 70-metre foundation structure from roller-compacted concrete (RCC) with a total volume of 1.8 million cubic metres, to support the hydroelectric power plant and the spillways.
Once completed, Site C will be the third hydroelectric dam and power plant on the Peace River and one of Canada’s largest dams. Once in operation, the project will provide 1,100 megawatts of capacity and about 5,100 gigawatt hours of energy each year to the province’s integrated electricity system. It will ensure the supply of clean and renewable energy for more than 100 years, to an average of 450,000 homes per year in BC.
If you would like to know more about the project, follow this link: https://www.sitecproject.com/