Siemens on July 5 entered the competition for the largest wind turbine in the world with an upgrade of its SWT-7.0-154 model. The new SWT-8.0-154 turbine boosts power output over the earlier model through upgraded magnet technology. Other components remain largely the same over the earlier model and the smaller SWT-6.0-154 turbine, Siemens said.

The firm thus joins two others offering 8-MW wind turbines: MHI Vestas and Gamesa and Areva’s joint venture Adwen. Deciding which model is “largest” depends on how one defines the term, though. All are rated at 8 MW, but the MHI Vestas V164 has a larger rotor diameter at 164 meters (m) than the 154-m Siemens model.

Adwen’s AD-180 has the largest rotor diameter—at 180 m—of any commercially available design, but none have yet been constructed. Adwen and Danish firm LM Windpower completed the first AD-180 blade in June, each of which is just over 88 m long (Figure 1). The blades will be used for the AD-180 prototype planned to be built at a site in Germany later this year.…

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