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March 2014
Volume 66    Issue 3

Waneta expansion project: Penstock tunnels

Mining Engineering, 2014, Vol. 66, No. 3, pp. 141-141
Roberds, Ben; Gemin, Eric


PREVIEW:

The Waneta Expansion Project (WAX) is located near the existing Waneta Dam site at the confluence of the Pend d’Oreille and Columbia rivers, approximately 10 km (6.2 miles) south of Trail, BC, Canada. The WAX owners consist of a partnership between Fortis Inc., Columbia Basin Trust and the Columbia Power Corp. This design-build project was awarded to SNC-Lavalin in late 2010 and is expected to be operational in mid-2015.

The WAX consists of a new 335-MW powerhouse, including two new Francis turbine units, each generating approximately 167 MW. The powerhouse is located downstream of the existing Waneta Dam, and will make use of excess water that would otherwise be spilled during the runoff season. Water will be funneled to the turbines through an intake structure and two 10.5-m (34.5-ft) diameter, concrete-lined Penstock Tunnels. A 10-km (6.2-mile) transmission line will connect the powerhouse to existing electrical grids. 



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