The utilisation of wind turbines is becoming an increasingly efficient way to produce clean energy and “although the current installed capacity is low, it is the fastest growing energy sector” (Leithead, 2007:957).
“The main constituent parts are a rotor with three blades, hub, nacelle and tower. The rotor is upwind of the tower, i.e. faces into the wind, and rotates in a vertical plane”
horizontal axis wind turbine
"three-bladed horizontal axis wind machine”
On average, a turbine will take about 6-7 years to pay back the costs and about 3-6 months to produce the energy used during production.