GE Wind Plant ERA 44 th Managementt and Marketing Conference Oak Brook, IL October 7, 2009

1. GE Wind PlantERA 44th Managementt and Marketing ConferenceOak Brook, ILOctober 7, 2009

2. GE 1.5GE 1.5MW Technology Global Wind & Solar PV annual installations • A single 1.5MW turbine … • Can power 500 homes • Total weight is 155 Tons • Has blade sets that sweep the area of a football field • Tip speed = 200 MPH (GWs) CAGR ~30 Solar PV 36% 25% CAGR 17 Wind 23% Environmentally Sound 8 100MW Wind Farm* SolarPV Displacement of: - 3 million tons of coal - 1.7 billion cubic meters of natural gas - 3.6 million barrels of oil 4 Wind Emission Reductions - 200,000 tons CO2/yr Equivalent to: 40,000 cars off the road/yr 50,000 acres of planted forested land Over 12,000 WTG’s installed globally

3. Wind Turbine Generator 397’ 135’ 262’

4. U.S. Wind Resource

5. Legend Assigned Under negotiation / Offer extended Available Current Wind Assets Pipeline to 2.4 GW 2008 Project 2009 Project 2010 Project 2011 and Beyond

6. Variable Speed - Value • Power capture - Mechanical Power = 0.5Cp AV3 - Cp -  curve - Optimize Cp : Vary blade tip speed - Rotor speed varies • Parts lifing - Power varies as cube of wind speed - Vary rotor speed: reduce torque variations Tip speed ratio • WTG technology - Rotor speed has to be de-coupled from grid freq - Partial or Full frequency converter

7. GE 1.5 WTG Rotor speed decoupled from grid frequency

8. • Power Curve Example

9. Wind Turbine Components

10. WTG Technologies • Doubly fed Asynchronous gen - Variable speed, partial converter - VAR producer - eg: GE 1.5, 3.6 • Permanent magnet Synchronous Gen - Variable speed, full converter - Completely isolated from the grid - eg: GE 2.5

11. GE 1.5 MW Generator • Doubly fed Induction Generator • Variable Speed , 6 poles • Stator directly connected to grid • Rotor connected through a power converter • Reactive Power capability

12. Wind farm • Padmount transformer • Collection cables, Fiber optic cables, Circuit breakers, Bus-bars • Lightning arresters • Substation transformer , Grounding transformers • Measuring & Control devices • Cap Banks -

13. System Architecture • PT’s and CT’s in Substation • System Measurements for Volts,Current & Frequency • Controller and Cabinet in Substation • Multifunction relay calculates Watts, VARs and Power Factor • PLC which provides control logic, controls and SCADA I/O • PC for commissioning and service • UPS and Ethernet switch • Windfarm LAN • Communicates VAR and Power Output commands to individual controllers in each WTG • SCADA PC • Operator Interface • Alarm and Fault Annunciation • Voltage and Power Factor Mode Select • Voltage,Power Factor and Windfarm Power Setpoint Control Windfarm Facility Substation Transformer CTs / PTs WTG's High Voltage Connection WTG's MF Relay Controller Windfarm Ethernet LAN SCADA PC Cabinet PC WFMS Cabinet in Substation Substation

14. WTG Power Plant BOP Electrical Equipment SEL Differential and Control and Protection Relays SEL 2032 Communication Processors Revenue Meters GE D20 Substation Controllers Current Transformers (CT’s) Potential Transformers (PT’s) High Voltage Fuses High Voltage Surge Arresters EMA or other vendor Feeder Breakers Disconnect Switches, Gang operated and Hook Stick SF6 Gas Breaker or Vacuum Breakers GSU Hydran Gas Analyzer (Transformer Gas Analysis) Pad Mount Transformers and Overhead Transformers for Station Power Capacitor Banks and Reactors OSIsoft PI Data Historian 1000 MCM Cable, fiber optic cable, control cable, ground grid and telephone cable Station Lighting Battery System including Charger Fire Protection

15. Step–Up Transformer (Padmount at the WTG) • 690 V (Y – grounded) / 34.5 KV (Delta) • 1.75 MVA • Impedance=5.75% , X/R=7.5 • No-load Taps -2 x 2.5% , 0 , 2 x 2.5%

16. Optional Functions Expand Capability • Fixed Capacitor and Reactor Bank Coordination • If supplemental reactive devices are needed these can be seamlessly integrated into the system • No requirement for additional control system or complex coordination • Line Drop Compensation • For use when the contractual point of interconnect is a distance from the windfarm substation • From signals at the substation, will regulate windfarm output to meet requirements at POI • Saves costs of communications and additional cabinets

17. Government Policy Support • Renewable Energy Credits / Green Energy Trading • Tax benefits • Production Tax Credit (PTC), Investment Tax Credit (ITC), property tax reductions • Governments grant tax credits for the production of wind energy • Fixed tariffs for feed-in wind power • The National or State Government requires local utilities to purchase electricity generated in exchange for a fixed price to the producer. The feed-in-tariff must be paid over a specified period of time and may be periodically changed. • Most predominant in Europe • CapEx Allowances • Wind Park developers receive a certain allowance to finance the CAPEX. This allows then to generate a positive return even in regions where there is no special feed-ins

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