GE Wind Energy 3.6s Offshore Martin Berkenkamp June 2003 GE Company Proprietary

Zond Tehachapi, USA Enron Spain Aerpac The Netherlands Tacke Germany R&D, GEPS New York GEPS Eng Greenville, SC Blade Facility Pensacola, USA Blade Facility Pensacola, USA Research/Supply Shanghai, China Research/Supply Shanghai, China Research Center Banglore, India Research Center Banglore, India GE Wind Energy Locations Doubled Engineering Capacity in Past 12 Months GE Company Proprietary

Track Record in Wind Turbine Design GE Wind Historic Background Introduction of Variable Speed Technology 1996 First Offshore Project 2000 GE Company Proprietary

Completion of State-of-the-Art Product Line GE Wind Development of Variable Speed Machines GE 1.5s/slGE 900sGE 3.6s offshoreGE 2.x GE Company Proprietary

COE/ Logistical Constraints Logistical Constraints OffshoreSite Constraints/ COE Products for all Applications GE Wind Application range of Product Family GE 1.5s/slGE 900sGE 3.6s offshoreGE 2.x GE Company Proprietary

Project Utgrunden, Sweden Installed: 2000/2001 Turbines:7 x GE 1.5s Yearly Production:4.5 GWh / turbine Utgrunden: Our Test Case for Offshore Wind GE Wind Offshore Experience GE Company Proprietary

Main Data: Tower options:optional Rotor diameter:104 m Generator capacity:3,600 kw Control:Pitch Rotor speed:8,5 – 15,5 Rpm Swept area:8,495 sqm Weight of the Nacelle280 tons incl. Rotor The 3.6: Our Offshore Product GE Wind – 3.6s Offshore GE Company Proprietary

Proven elements concept analogous to more than GE 1.5 since 1996 separated drive train variable-speed, variable-pitch double-fed asynchronous generator frequency converter recommended suppliers New elements experience GE 1.5s offshore at Utgrunden annual maintenance over-specified design crane system E-container at nacelle 3.3 kV generator external heat exchanger helicopter hoisting platform (optional) GE Wind – 3.6s offshore “Low Risk” Approach for New Platform GE Company Proprietary

High Performance airfoils Electrical Pitch System Yaw System With Actice Pads Container with Converter, Switchgear & Transformer Rotor Lock Gearbox 2 planetary 1 parallel stage Doubly Fed Induction Generator Internal Crane system “Low Risk” Approach for New Platform GE Wind – 3.6s offshore GE Company Proprietary

Length: 50,5 m Material: glas-epoxy Profile:GEWE - design Shape: pre-bended Rotor Blades Blades optimised for Low-Loads & High Energy Yield GE Company Proprietary

Gears: - multi-stage planetary gears Motors: - battery-buffered DC motors „collective pitch“ for power control „single pitch“ for aerodyn. braking Bearing: - double roller bearing Extension of Proven Concept of GE 1.5 Series Pitch System GE Company Proprietary

Design: - distributed drive train with 3-point support Bearings: - grease lubricated double spherical roller bearing - life time h (20h) Shaft: - long, hallow forged shaft Gear box: - 2 planetary, 1 parallel stage - life time h - oil volume: 550 l - lubrication with electrical & mech. pump Brake: - active, hydraulic double disk brake Clutch: - maintenance-free steel coupling Extension of Proven Concept of GE 1.5 Series Mechanical Drive Train GE Company Proprietary

Oil cooler of gear box Assembly air channels Air-to-air heat exchanger for generator External Heat Exchange due to Offshore Environment Cooling System for Gear Box and Generator (Not shown:) Water cooler of frequency converter (behind container) GE Company Proprietary

Gears: - 4 x multi-stage planetary Motors: - AC motors with electro-mech. deployed brake Bearing: - Double roller bearing Damping: - robust, pre-tensioned friction system with brake disk Environmental Protection inside Bedplate Electro-mechanical Yaw System GE Company Proprietary

Power Curve Verification Exceeding Expectations 3.6 Performance Validation – Power Curve GE Company Proprietary

Sound Power Level and tonality for wind speeds from 6 to 10 m/s at 10 m height No tonality measured acc. IEC New Low Noise Airfoils Successfully Tested GE 3.6 Performance Validation - Noise GE Company Proprietary

New Service Procedures Tested GE 3.6 Performance Validation - Service GE Company Proprietary

Focus on Extending the Platform Capabilities 3.6 Multi Generation Product Plan Proto GE 3.6 Barrax 2002 Offshore Demo Arklow 2003 GE 3.2 Dunkirque 2003 Offshore Serial Production Offshore Cape Cod US 60Hz Prototype GE Company Proprietary

Arklow Bank Phase 1: Offshore wind farm Arklow Bank Phase 1 Co-Development project of Airtricity & GE Wind Energy 7 units GE 3.6s offshore = 25.2 MW Turn-key project incl. 38 kV grid connection Start of installation: July 2003 Commissioning: Sept Total capacity of Arklow Bank: approx. 400 MW Demonstrating Capabilities:GE 3.6s Offshore & GE Project Development GE Company Proprietary

Arklow Bank Phase 1: Site data Arklow site Annual average wind speed: approx m Distance to shore: approx. 10 km Water depth: 4.2 – 6.4 m (MSL) Tidal range: 2.8 m Design wave height: approx. 10 m Currents: up to 5 knots ! Soil: dense sand & gravel => Heavy Scour protection Monopile Diameter: 5.1 m Penetration: 30 m Weight: approx. 270 t Largest Offshore Turbine so far setting new standards GE Company Proprietary

Arklow Bank Phase 1: Grid Connection Turn-Key Delivery Through GE Different Businesses GE Company Proprietary

Arklow Phase 1: Supply Chain Salzbergen Windfarm Arklow Rosslare Port Brake Blades from Brazil Towers and Monopile Global Product and Global Project Logistics GE Company Proprietary

larger water depth (> approx. 20 m) hub height > 75 m fatigue design driver NSWP tender Future Development for Deeper Water: Tripod Concept Solution for Large-Scale Deep-Water Projects GE Company Proprietary

Vielen Dank! GE Company Proprietary