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BC Hydro & Premier Horgan Roll the Dice again on Site C



Despite known foundation problems with unknown solutions or cost, and numerous calls to halt work while that is determined, work on the Site C Dam has carried on.


Now, BC Hydro has ignored its own Site C experts and is completing diversion of the Peace River after the latest possible deadline of September 30th, further increasing cost overrun and dam safety risks.


Since Site C was delayed one year in response to geotechnical problems, BC Hydro has consistently argued – before both courts and the BCUC – that missing the mid-September diversion date would delay the project for a year.

The river diversion was basically achieved on October 3rd and 4th - two weeks later than BC Hydro’s plans:

“River diversion can only take place after Labour Day holiday (first Monday in Sept) and must be completed by mid- Septemberi

Site C must meet several critical dates in order to stay on schedule. To complete the dam, the river must be diverted into tunnels in September, 2020. The diversion date is critical since the preliminary dam must be completed before the spring freshet:

The latest permitted start date for river closure is October 1st as a result of the following constraints: a) Requirement to reliably construct the upstream cofferdam to the final crest elevation prior to the start of the flood window the following year. Previous analysis has indicated that the current upstream cofferdam construction schedule is nearing the limit of what can be reliably constructed in the available window. b) Consequences to the BC Hydro Generation System to meet restricted flow requirements during winter. Extending restricted flow controls into the winter months will have a high likelihood of restricting upstream Peace discharges throughout the entire winter period due to the downstream ice formation. This imposed winter restriction would have a cascading impact on GM Shrum and Peace Canyon generation, and consequently system reliability during this winter season, since these two plants generally supply 1/3 of the BC Hydro load during the winter months.”ii

The engineering documents give specific details. iii Simply stated, BC Hydro has stated before courts and regulators that the September delay will risk power supplies and completion dates. These are not minor risks – if the preliminary dams are not completed before the spring freshet, the risk of a dam breach exists:

“5.2.1.2 FID schedule contingency A critical milestone is the Start of River Diversion, as it is both significantly time sensitive and on the critical path. It requires construction of cofferdams, which must be completed outside of the May-through-August period due to the risk of floods, and outside of the winter period due to constructibility constraints. In addition, construction of the cofferdams must occur in a period with a high likelihood of controlled low discharges from the upstream W.A.C. Bennett Dam. This schedule restricts the Start of River Diversion to a window between September 1 and October 1 of a given year. If the diversion window is missed, the Start of River Diversion would be rescheduled to the following year, directly impacting schedule contingency and project completion.” iv

In summary, the initial Site C river diversion was achieved not only one year behind schedule, but has missed BCH’s own drop dead date required for a successful series of critical events to take place in the coming months. Meanwhile, the BC Government and BC Hydro are not even talking about this ‘historic’ milestone being achieved. Site C seems to be the $11 Billion and counting megaproject that proponents do not want to talk about