Atlin hydroelectric project, Northwest British Columbia, Canada
Xeitl Limited Partnership
Drainage area at control structure
Drainage area at intake
Mean annual flow at intake
Project design flow
Modified run-of-river with storage on Surprise Lake. Power supplied to isolated off-grid community.
A sheet pile and rip-rap weir at the outlet of Surprise Lake increases the lake’s natural storage. A low level outlet releases flow to Pine Creek (including the project further downstream), and an orifice-type fishway allows for continued migration of arctic grayling between Pine Creek and Surprise Lake.
A concrete gravity weir with an ogee-type spillway was built across Pine Creek. A concrete intake is located on the left bank of Pine Creek.
The penstock is approximately 3900m long and is made of 48” diameter HDPE and steel pipe.
2 x 1MW horizontal axis Pelton, double overhung on a single generator
4.16 kV direct-coupled synchronous
Steel building on concrete foundation, with 23 tonne overhead crane
At powerhouse, step-up 4.16kV to 25kV
750 m long three-phase 25 kV powerline connects to the local Atlin grid