The B75 rotor blade, which measures 75 meters in length, is the world’s largest fiberglass component cast in one piece.
The rotor blade is manufactured from glass fiber-reinforced epoxy resin and balsa wood using the patented integral blade process. It has no seams or glued joints and no adhesive, all of which saves weight.
Compared with the Siemens 3.6-120 turbine, which is the current best-seller in the offshore wind market, the Siemens 6.0-154 turbine needs 40% less foundations. Since the foundation cost does not increase proportionally with turbine rating, this leads to significant infrastructure savings.
One SWT-6.0-154 wind turbine can generate about 23 million kWh annually at a typical offshore site having 8.5 m/s mean wind speed.
When the 154 meter rotor is operated at a wind speed of 10 meters per second, it captures the energy from 200 metric tons of air every second.
The Siemens B75 blade weighs about 25 tons– this is equivalent to the weight of four bull elephants.
[wired.co.uk] – Siemens builds 75-metre-long rotor blade from a single mould
[siemens.com] – rotor blade fact sheet