PROJECT DATA SUMMARY

Capacity: 2,400 kW

Annual Energy Estimate: 7,510 MWh

Capacity Factor: 36%

Turbine Type: Vertical Kaplan

Turbine Design Flow: 1,400 cfs

Head: 23 feet

Transmission Line Length: TBD

Maximum Emergency Canal Flow: 3,900 cfs

Flow Pattern: Variable flow during the irrigation season, negligible flow during the non-irrigation season (Nov – March).

Project Coordinates: 46°43’20.01”N, 119°2’8.27”W

The PE46A Wasteway Project will generate power from water dropping into the Potholes East Canal. The project will consist of a new intake, buried penstock, and compact powerhouse discharging into the Potholes East Canal. This project has higher head and a relatively short penstock which are advantages. The main challenges are available flows only during the irrigation season and the project’s small capacity.

SCOOTENEY OUTLET

The Scooteney Outlet releases water from Scooteney Reservoir into Potholes East Canal. Scooteney Reservoir has significant storage capacity so level controls from the Project is not required to be instantaneous. However, flow must be re-established in a reasonable time-frame to maintain canal flow.

​PE 46A Wasteway


SCOOTENEY INLET

​MESA CHECK

(PEWC 1973 Drop)

The Mesa Check project will utilize flow that would normally pass through the existing check structure. The project would consist of a new intake, bypass, concrete power canal, powerhouse, and tailrace. The advantages of this project are the relatively high available flows. The key challenges are the low head and the requirement to maintain very tight canal level control.

PROJECT DATA SUMMARY

Capacity: 1,000 kW

Annual Energy Estimate: 4,500 MWh

Capacity Factor: 51%

Turbine Type: Two VLH Turbines

Turbine Design Flow: 1,200 cfs

Head: 12 feet

Transmission Line Length: 2,700 ft

Maximum Emergency Canal Flow: 1,800 cfs

Flow Pattern: Variable flow during the irrigation season.

Project Coordinates: 46°40’8.33”N, 119°1’57.51”W

The PE 16.4 Wasteway Project will utilize excess water from the irrigation system as it drops from the Potholes East Canal into the Columbia River. The project will consist of a new intake, buried penstock, and compact powerhouse on the discharge canal to the Colombia River. The relatively high head and year round flow make this site attractive. There may be an endangered plant in the general area that could influence powerhouse sighting and penstock routing.

PROJECT DATA SUMMARY

Capacity: 1,500 kW

Annual Energy Estimate: 8,100 MWh

Capacity Factor: 62%

Turbine Type: Vertical Axial Flow Kaplan

Turbine Design Flow: 180 cfs

Head: 115 feet

Transmission Line Length: 1,000 ft

Maximum Emergency Canal Flow: 770 cfs

Annual Flow: Year round flow

Project Coordinates: 46°30’19.97”N, 119°15’27.46”W

The Scooteney Inlet Project utilizes water dropping into Scooteney Reservoir. The project infrastructure would include a new intake, short power canal, powerhouse, and discharge into the downstream canal. The low head of the site and the likely shallow bedrocks are disadvantages. The larger capacity and short power canal required are advantages for the project.

​PE 16.4 Wasteway


PROJECT DATA SUMMARY

Capacity: 640kW

Annual Energy Estimate: 2,730 MWh

Capacity Factor: 49%

Turbine Type: Horizontal Francis

Turbine Design Flow: 50 cfs

Head: 145 feet

Transmission Line Length: 500 ft

Maximum Emergency Canal Flow: 187 cfs

Flow Pattern: Variable flow during the irrigation season, negligible flow during the non-irrigation season (Nov – March).

Project Coordinates: 46°30’49.32”N, 119°14’18.48”W

PROJECT DATA SUMMARY

Capacity: 1,800 kW

Annual Energy Estimate: 6,860 MWh

Capacity Factor: 44%

Turbine Type: Single Kaplan Pit Turbine

Turbine Design Flow: 1,500 cfs

Head: 16.5 feet

Transmission Line Length: 200 ft

Maximum Emergency Canal Flow: 1,800 cfs

Annual Flow: Flow only during irrigation system, runoff and drainage flow off season.

Project Coordinates: 46°35’25.41”N, 119°3’7.38”W