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 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.

​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.

SCOOTENEY INLET

​PE 46A Wasteway


The Pinto Dam project will utilize water discharged from the lower outlet of Pinto Dam. The new project infrastructure will include a submerged intake in Billy Clapp Lake, penstock buried along the existing emergency spillway, compact powerhouse, and an outlet channel. The consistency of flow, with the potential of future increases to balance the expanding irrigation system, and moderate head available at the site are key advantages. Potential challenges may include the rock excavation cost for laying the new penstock in the existing spillway channel, powerhouse foundation design due to the lack of bedrock, and the potential environment impact of the project, which is partially located in a fish and wildlife reserve.

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 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: 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

The Scootney Inlet Project utilizes water dropping into Scootney 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.

PINTO DAM

PROJECT DATA SUMMARY

Capacity: 650 kW (possible future expansion to 2.9 MW)

Annual Energy Estimate: 4,800 MWh

Capacity Factor: 84%

Turbine Type: Horizontal Francis

Turbine Design Flow: 100 cfs

Head: 61 to 96 ft

Transmission Line Length: 7,500 ft

Maximum Emergency Spillway Flow: 9,000 cfs

Flow Pattern: Consistent flow year round

Project Coordinates: 47°26’53.32”N, 119°15’15.86”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

​PE 16.4 Wasteway