BC Hydro update #13 – Electricity flowing again through BC Hydro’s 500-kilovolt transmission circuit on the Fraser River
September 14th, 2011
Category: Outages and Service Interruptions
Wednesday, Sept. 14
VANCOUVER – Good news: electricity is flowing again through BC Hydro’s 500-kilovolt transmission line across the Fraser River near the Port Mann bridge. The line was re-energized this past weekend after it was taken out-of-service in late June following damage in the spring. Over the past few months, BC Hydro has been stabilizing and straightening the 500-kilovolt tower. The line was de-energized to ensure the work could be done safely.
The 500-kilovolt transmission line is key to BC Hydro’s ability to serve local power needs by providing back-up supply and a connection to additional transmission circuits for the high use winter season; and to sell surplus power to markets outside of BC when practical to do so, making it a priority to get the line safely back into service.
BC Hydro has also been working on the 230-kilovolt transmission line running parallel to the 500-kilovolt line after a transmission tower that supports the line fell into the Fraser River on July 4. It is expected that the 230-kilovolt line will be back in service by late fall, using an innovative solution that will not require using the fallen tower.
With both lines being out-of-service this summer, BC Hydro was able to meet local power needs by routing power to customers through different circuits, as adjacent transmission lines in the area are designed to handle additional flow on a short term basis.
Both the 500-kilovolt and 230-kilovolt lines need to be ready to deliver a safe and reliable supply of electricity for this year’s storm season, typically from mid-October to mid-February and to meet the winter peak demand for electricity.
230-kilovolt line (with the fallen tower)
-BC Hydro is restoring the 230-kilovolt line by:
-This work is expected to be completed in November 2011.
500-kilovolt line (previously leaning tower)
-BC Hydro has been stabilizing, repairing and straightening the 500-kilovolt tower by:
-After the tower was stabilized, BC Hydro used jacks to straighten the tower, remove some of the guy wiring and raise the lines from the waist of the tower back to the top.
-Next spring and after the winter peak season, BC Hydro plans to replace the existing section of line on the 500-kilovolt circuit with the same high-tension, low-sag line technology being used this year on the 230-kilovolt system. These new 500-kilovolt lines will eliminate the need for the once-damaged tower completely, allowing for the subsequent dismantling of the tower.
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Minister Rich Coleman, conservation, Power Smart, Dave Cobb, Northwest Transmission Line, Interior to Lower Mainland, economic development, Mica Expansion Project , Greg Reimer, infrastructure, First Nations, Site C, impact benefit agreement, generation, Mica, transmission lines, safety, Canucks, regulatory review, Smart Meters