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Turbines and Towers | by brewbooks
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Turbines and Towers

Turbines and Towers

127 wind turbine generators, spanning across 9,000 acres near Ellensburg, Washington.

Towers are 221 ft high at hub, 13.2 ft wide base and 7.6 ft wide at top and weigh 104 tons. Each turbine consists of 3-blades, 129 ft long, 11.62 ft at widest and 1.6 ft at tip with each blade weighing 14,300 lbs. The rotor (blades, hub and nose cone) weighs 42 tons.

 

Turbine generators are V80-1.8 MW machines manufactured by Vestas, a Danish company. Each generator can produce 690 volts, which is stepped-up to 34,500 volts by an on-board transformer. The generator is housed inside a fiberglass nacelle.

The generator and nacelle together weigh 69 tons.

 

Total height with a blade fully extended is 351 ft and total weight is approximately 270 tons. These are the largest wind turbine generators in Washington State (as of 2007)

 

Each tower foundation reaches a minimum depth of 25 ft and a maximum of 32 ft depending on bedrock depth and takes an average of 100 to 260 cubic yards of concrete. Each foundation requires 120 anchor bolts that span from the surface of the ground to the bottom of the foundation. A single 28 ft anchor bolt weighs approximately 150 lbs.

 

Rotors turn 15.5 rpm, turning clockwise (front view) with a rotor diameter of 264 ft, larger than a wingspan of a Boeing 747.

 

Turbines can produce electricity at wind speeds as low as 9 mph, reaching their peak of production at 31 mph and shut down at constant wind speeds of 56 mph. The prevailing winds are from the northwest.

 

Each turbine is capable of producing 1.8 megawatts, or a total of 229 megawatts of capacity, enough electricity to serve approximately 73,000 homes when all 127 are generating at full capacity.

 

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Taken on April 28, 2007