Atlin hydroelectric project, Northwest British Columbia, Canada
Item |
Description |
Project owner |
Xeitl Limited Partnership |
Water source |
Pine Creek |
Drainage area at control structure |
467km2 |
Drainage area at intake |
557km2 |
Mean annual flow at intake |
4.2m3/sec |
Project design flow |
2.7m3/sec |
Gross head |
107.6m |
Project operation |
Modified run-of-river with storage on Surprise Lake. Power supplied to isolated off-grid community. |
Project capacity |
2.1MW |
Control structure |
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. |
Intake |
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. |
Penstock |
The penstock is approximately 3900m long and is made of 48” diameter HDPE and steel pipe. |
Turbines |
2 x 1MW horizontal axis Pelton, double overhung on a single generator |
Generator |
4.16 kV direct-coupled synchronous |
Powerhouse |
Steel building on concrete foundation, with 23 tonne overhead crane |
Switchyard |
At powerhouse, step-up 4.16kV to 25kV |
Powerline |
750 m long three-phase 25 kV powerline connects to the local Atlin grid |