Enron Wind 1.5 MW Series Wind Turbines

1. 5 M W Specifications – Enron Wind 1.5 MW Series Series

65m 70.5m 77m Performance Cut-in wind speed 4.0 m/s 3.0 m/s 3.0 m/s Cut-out wind speed 25 m/s 25 m/s 20 m/s Rated wind speed 13 m/s 12 m/s 11.8 m/s

Rotor Number of blades 3 3 3 Diameter 65 m 70.5 m 77 m Swept area 3318 m2 3902 m2 4657 m2 Rotor speed (variable) 11-20 rpm 11-20 rpm 10-18 rpm Maximum tip speed 68 m/s 73.8 m/s 72.6 m/s Blade length 31.2 m 34.0 m 37.2 m

Gearbox Type: Three step planetary spur gear system i=72, for 77 meter rotor: i=80 Tower Multi layer coated, conical tubular steel tower Generator with interior safety ladder to the nacelle Type: Rotary current asynchronous with slip rings Load lifting system, 250 kg carrying force Rated power: 1500 kW Hub height: 65 meter rotor: 67.1 , 80 or 85 meter Inverter 70.5 meter rotor: 64.7, 80 , 85 or 100 meter 77 meter rotor: 61.4, 80, or 85 meter Type: IGBT-frequency inverter Lightning Protection System Braking Systems Lightning receptor installed on blade tips Individual pitch regulation Discharge inside the rotor blades along Brake control system: fail-safe nacelle and tower

Yaw System Sound Proofing Motor driven with wind direction Structure borne noise insulation of the drive sensor and automatic cable unwind train Sound reduced gearbox Control System Reduced blade tip speed Microprocessor-based programmable Noise reduced nacelle logic controller (PLC) Remote control operating system Specifications subject to possible modification.

Global Manufacturing Capabilities A New Generation of Power. Enron Wind 1.5 MW Series

Americas Enron Wind offers ISO 9001 Quality Systems Certified manufacturing, experienced power plant

13681 Chantico Road design and engineering, development expertise, creative financing options, experienced operations Tehachapi, CA 93561, USA and maintenance, and responsive and reliable customer service. Its wind technology has been T. +1 661 823 6423 utilized in world-class projects around the globe, including the world's three largest wind power F. +1 661 823 1829 e-mail: [email protected] projects. As a part of Enron Corp., with $33 billion in assets, Enron Wind shares the diverse www.wind.enron.com resources of the world’s leading energy and communications company.

Europe Enron is a leader in providing cleaner energy sources worldwide. We know that renewable energy Germany will be an integral part of the world energy mix in the next century, and we are committed to helping Holsterfeld 5a our partners and customers design and implement energy solutions for their unique energy needs. 48499 Salzbergen, Germany Every relationship we pursue bears our uncompromising commitment to quality and innovation. T. +49 (0)5971 980 0 F. +49 (0)5971 980 1090 EnronWınd Spain Carretera N-400, Km. 57 45350 Noblejas (Toledo), España T. +34 (0)91 724 3200 F. +34 (0)91 724 3299

E printed on recycled paper, ©2000 Enron Wind TORQUE: VARIABLE VS. CONSTANT SPEED Enron Wind Technology. Superior power quality. Maximum energy capture. Torque Stabilization Torque Reactive power control and voltage support. Reduced loads. and Reduced Loads.

With advanced wind turbines ranging from 750 kW to 2.0 MW, Enron 9.00 9.25 9.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50 11.75 12.00 Wind provides customized solutions for today’s challenging on and Minutes Variable Constant TM offshore requirements. Enron Wind technology features PowerMax Enron Wind's variable speed operation provides reduced mean torque loads and smaller torque excursions for a given power variable speed control for reliable, cost effective operation, and offers its output compared to constant speed wind turbines. patented Dynamic VAR Control for local grid support and improved transmission efficiencies. Enron Wind's ISO Quality Systems certified TOWER OSCILLATIONS: ACTIVE DAMPING manufacturing facilities are located in California, Germany and Spain. VS. STANDARD CONTROL

0.6

Meters 0.5

0.4

0.3

0.2

0.1

0 20 40 60 80 100 120 140 160 180 200 t(s)

0.6

Meters 0.5

0.4

The Enron Wind 1.5 MW Series Wind Turbine. 0.3

0.2

When it comes to "mega" technology, our proven 1.5 MW wind turbine was the 0.1 first of its size class to become commercially available. Today, our customers find 0 20 40 60 80 100 120 140 160 180 200 t(s) that the Enron Wind 1.5 MW Series wind turbines combine proven technology and Standard control Active damping an extremely low cost of energy (COE), with quiet, reliable operation. The Enron Enron Wind's PowerMax system provides active damping of the entire Wind 1.5 MW Series wind turbines are also versatile. Their universally operable wind turbine system. Results include considerably less tower oscillation as compared to constant speed wind turbines, greater drivetrain nacelle accepts rotor diameters of 65 meters, 70.5 meters, and 77 meters. And reliability, reduced maintenance cost, and longer turbine life. DYNAMIC REACTIVE POWER (VAR): LEADING POWER FACTOR their variable hub heights range from 61.4 meters to 100 meters.

ENRON WIND 1.5 MW POWER CURVES 500 Higher Energy Capture and Reduced Loads. 400 The Enron Wind 1.5 MW Series wind turbines are active yaw and pitch regulated kW 300 1800 200 100 machines with power/torque control capability. The rotor utilizes blade pitch Volts & Amps 1500 0 By design, through its advanced electronics and peak torque, providing greater drivetrain -100 regulation and variable speed operation to achieve optimum power output. The -200 1200 aerodynamics, the Enron Wind technology reliability, reduced maintenance cost, and -300 1.5 MW Series wind turbines also feature a bedplate drivetrain design where all -400 900 captures significantly more energy than constant longer turbine life. -500 nacelle components are attached to the bedplate. The nacelle is lined with sound -600 600 speed wind turbines at lower cost. While Samples insulating foam and the generator and gearbox are supported by elastomeric 300 constant speed rotors must be designed to resist Voltage Current elements to assure that they are among the quietest machines available on the Dynamic Reactive Power 0 high loads when subjected to wind gusts, Enron market today. The Enron Wind 1.5 MW Series technology is designed in 024681012141618202224m/s Enron Wind's Dynamic Reactive VAR Control enables the Wind’s variable speed PowerMax system enables (VAR) and Voltage Support. wind turbine to generate reactive power (current leading accordance with the International Electrotechnical Committee 1400-1 Standard voltage), providing transmission efficiencies and 1.5MW/65m 1.5 M W / 70 .5 m 1.5MW/77m enhanced voltage stability, which is particularly beneficial the loads from the gust to be absorbed and in weak grid applications. and Germanisher Lloyd's Rules and Regulations for wind turbine design. Wind speed at hub height • Standard atmosphere according to DIN ISO 2533,M.S.L. Standard Rayleigh distribution and unobstructed air flow converted to electric power. By adjusting blade Enron Wind’s Dynamic pitch through the turbines’ variable pitch VAR Control option ENERGY STORAGE IN THE ROTOR operation, rotor speed is controlled. Generator provides support to local ENRON WIND 1.5 MW ANNUAL YIELD torque is controlled through the frequency grid voltage, improving Superior Technology for Maximum kWh 6.000.000 converter. This combined control strategy allows transmission efficiencies v Energy Capture. and providing the utility 5.000.000 higher rotor rpm in strong, gusty winds, thereby grid with reactive power n 4.000.000 reducing torque loads in the drivetrain. At the heart of the Enron Wind technology is a patented power electronic converter (VARs) to further strengthen the grid. The Enron 3.000.000 PowerMax also provides active damping of the P which converts the wind turbine’s variable speed operation into constant frequency Wind technology, outfitted with its patented entire wind turbine system, resulting in t power required by the utility. The results are remarkable 2.000.000 considerably less tower Dynamic VAR Control option, can automatically Wind speedRotor speed Power – higher energy yield and high quality power that is fully 1.000.000 oscillation as compared to maintain defined grid voltage levels and/or 0 compliant with IEEE-519 power quality requirements. deliver reactive power (VARs) to the utility. This 5 5,5 6 6,5 7 7,5 8 8,5 m/s constant speed wind The energy of a gust is stored by accelerating the rotor. This leads to reduced loads, improved transmission turbines. Active damping feature is particularly beneficial to weaker grids. efficiencies and performance. 1.5MW/65m 1.5MW/70.5m 1.5MW/77m of the machine also limits Wind speed at hub height • Standard atmosphere according to DIN ISO 2533,M.S.L. Standard Rayleigh distribution and unobstructed air flow TORQUE: VARIABLE VS. CONSTANT SPEED Enron Wind Technology. Superior power quality. Maximum energy capture. Torque Stabilization Torque Reactive power control and voltage support. Reduced loads. and Reduced Loads.

0.6

Meters 0.5

0.4

0.3

0.2

0.1

0 20 40 60 80 100 120 140 160 180 200 t(s)

0.6

Meters 0.5

0.4

The Enron Wind 1.5 MW Series Wind Turbine. 0.3

0.2

ENRON WIND 1.5 MW POWER CURVES 500 Higher Energy Capture and Reduced Loads. 400 The Enron Wind 1.5 MW Series wind turbines are active yaw and pitch regulated kW 300 1800 200 100 machines with power/torque control capability. The rotor utilizes blade pitch Volts & Amps 1500 0 By design, through its advanced electronics and peak torque, providing greater drivetrain -100 regulation and variable speed operation to achieve optimum power output. The -200 1200 aerodynamics, the Enron Wind technology reliability, reduced maintenance cost, and -300 1.5 MW Series wind turbines also feature a bedplate drivetrain design where all -400 900 captures significantly more energy than constant longer turbine life. -500 nacelle components are attached to the bedplate. The nacelle is lined with sound -600 600 speed wind turbines at lower cost. While Samples insulating foam and the generator and gearbox are supported by elastomeric 300 constant speed rotors must be designed to resist Voltage Current elements to assure that they are among the quietest machines available on the Dynamic Reactive Power 0 high loads when subjected to wind gusts, Enron market today. The Enron Wind 1.5 MW Series technology is designed in 024681012141618202224m/s Enron Wind's Dynamic Reactive VAR Control enables the Wind’s variable speed PowerMax system enables (VAR) and Voltage Support. wind turbine to generate reactive power (current leading accordance with the International Electrotechnical Committee 1400-1 Standard voltage), providing transmission efficiencies and 1.5MW/65m 1.5 M W / 70 .5 m 1.5MW/77m enhanced voltage stability, which is particularly beneficial the loads from the gust to be absorbed and in weak grid applications. and Germanisher Lloyd's Rules and Regulations for wind turbine design. Wind speed at hub height • Standard atmosphere according to DIN ISO 2533,M.S.L. Standard Rayleigh distribution and unobstructed air flow converted to electric power. By adjusting blade Enron Wind’s Dynamic pitch through the turbines’ variable pitch VAR Control option ENERGY STORAGE IN THE ROTOR operation, rotor speed is controlled. Generator provides support to local ENRON WIND 1.5 MW ANNUAL YIELD torque is controlled through the frequency grid voltage, improving Superior Technology for Maximum kWh 6.000.000 converter. This combined control strategy allows transmission efficiencies v Energy Capture. and providing the utility 5.000.000 higher rotor rpm in strong, gusty winds, thereby grid with reactive power n 4.000.000 reducing torque loads in the drivetrain. At the heart of the Enron Wind technology is a patented power electronic converter (VARs) to further strengthen the grid. The Enron 3.000.000 PowerMax also provides active damping of the P which converts the wind turbine’s variable speed operation into constant frequency Wind technology, outfitted with its patented entire wind turbine system, resulting in t power required by the utility. The results are remarkable 2.000.000 considerably less tower Dynamic VAR Control option, can automatically Wind speedRotor speed Power – higher energy yield and high quality power that is fully 1.000.000 oscillation as compared to maintain defined grid voltage levels and/or 0 compliant with IEEE-519 power quality requirements. deliver reactive power (VARs) to the utility. This 5 5,5 6 6,5 7 7,5 8 8,5 m/s constant speed wind The energy of a gust is stored by accelerating the rotor. This leads to reduced loads, improved transmission turbines. Active damping feature is particularly beneficial to weaker grids. efficiencies and performance. 1.5MW/65m 1.5MW/70.5m 1.5MW/77m of the machine also limits Wind speed at hub height • Standard atmosphere according to DIN ISO 2533,M.S.L. Standard Rayleigh distribution and unobstructed air flow 1. 5 M W Specifications – Enron Wind 1.5 MW Series Series

65m 70.5m 77m Performance Cut-in wind speed 4.0 m/s 3.0 m/s 3.0 m/s Cut-out wind speed 25 m/s 25 m/s 20 m/s Rated wind speed 13 m/s 12 m/s 11.8 m/s

Gearbox Type: Three step planetary spur gear system i=72, for 77 meter rotor: i=80 Tower Multi layer coated, conical tubular steel tower Generator with interior safety ladder to the nacelle Type: Rotary current asynchronous with slip rings Load lifting system, 250 kg carrying force Rated power: 1500 kW Hub height: 65 meter rotor: 67.1 , 80 or 85 meter Inverter 70.5 meter rotor: 64.7, 80 , 85 or 100 meter 77 meter rotor: 80 or 85 meter Type: IGBT-frequency inverter Lightning Protection System Braking Systems Lightning receptor installed on blade tips Individual pitch regulation Discharge inside the rotor blades along Brake control system: fail-safe nacelle and tower

Global Manufacturing Capabilities A New Generation of Power. Enron Wind 1.5 MW Series

Americas Enron Wind offers ISO 9001 Quality Systems Certified manufacturing, experienced power plant

13681 Chantico Road design and engineering, development expertise, creative financing options, experienced operations Tehachapi, CA 93561, USA and maintenance, and responsive and reliable customer service. Its wind technology has been T. +1 661 823 6423 utilized in world-class projects around the globe, including the world's three largest wind power F. +1 661 823 1829 e-mail: [email protected] projects. As a part of Enron Corp., with $46 billion in assets, Enron Wind shares the diverse www.wind.enron.com resources of the world’s leading energy and communications company.