LOWER BAKER FLOW IMPLEMENTATION
DEVELOPMENT OF UNIT 4 POWERHOUSE
Jeffrey Reichmuth
Consulting Engineer
February 18, 2014
TOPICS OF PRESENTATION
 30MW Hydroelectric Facility with Synchronous
By-pass Valve and Neighboring 85MW U3
 Aquatics Requirements Key to License
 Minimum In-Stream flow 1200cfs/1000cfs
 Ramping Requirements, 1inch per Hour
 Control Strategies – Dam, Unit 3, Unit 4, SBV
 Economic Dispatch
 Construction Started December 2010
 Commissioning June 2013
Baker River Hydroelectric Project, Concrete, WA
LOWER BAKER PROJECT AREA
Skagit River Near Concrete Washington
Skagit River USGS Gage
for In-stream Flow
Compliance
Ramping Restrictions in effect
when flow below 26,000 cfs in
Skagit River
Baker River USGS Gage
- Minimum In-Stream
Flow 1200/1000 cfs
Aquatics Table Mandating Flow
Aquatics Ramping Rate Figure
Ramping Rate in
Inches per Hour
Down Ramp of Facility based on Aquatics Table
SITE SELECTION PROCESS







FERC License 2150 – October 17, 2008
FERC - Board of Consultants Selected
Various Sites And Options Reviewed
Option With Synchronous By-pass Valve
Ultimately Selected Site 5
Geotechnical Baseline Report Prepared
Slope Stability Exploration Plan Prepared
Site 1 – Low Level Outlet in Dam
Site 2 – South Portal PH in Cavern
Site 3 – Old Units #1 and #2 Location
Site 4 – PH South of Unit #3
Site 5 – PH 400 Feet South of Unit #3,Two
Tunnel Length Options
ALIGNMENT OF UNIT 4 POWER TUNNEL
Geologic Perspective of Facility Arrangement
SLOPE STABILITY MEASURES






Slope Stability Exploration Indicated
Movement Of Slope During Wet Seasons
Buttress Wall Built at Main Powerhouse
Excavation
Soldier Pile Wall Built Near Access Road
Horizontal Drains Installed Into Slope
Constant Electronic Slope Monitoring
Installed
Evacuation Alarm Installed For
Construction
Subterranean Powerhouse

Autodesk – Navisworks Model, Developed by Black and Veatch
Section Through Powerhouse

Section through Navisworks Model
OWNER FURNISHED EQUIPMENT

PSE Supplied the Turbine, Generator and the Station Transformer


Turbine Provided by Litostroj Power, Ljubljana, Slovenia
Generator Provided by Končar Generators and Motors, Zagreb,
Croatia
Station Transformer Provided by Waukesha Electric Systems,
Waukesha, WI

Generator Installation

Setting the Rotor with 550T Mobile Crane
Synchronous By-pass Valve
Just add water…