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 Economic Dispatch – Dam, Unit 3, Unit 4, SBV 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 Baker River USGS Gage - Minimum In-Stream Flow 1200/1000 cfs Ramping Restrictions in effect when flow below 26,000 cfs in Skagit River

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 Site 2 Site 3 Site 4 Site 5 – – – – – Low Level Outlet in Dam South Portal PH in Cavern Old Units #1 and #2 Location PH South of Unit #3 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 Navisworks Model Section Through Powerhouse

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

 Setting the Rotor with 550T Mobile Crane Generator Installation

Synchronous By-pass Valve

Just add water…