Siemens deploys its largest rotor wind turbine

With a record rotor diameter of 154 meters, each SWT-6.0-154 wind turbine can produce 25 million kWh of clean electricity in offshore locations, enough to supply 6,000 households

Erlangen, Germany, October 8, 2012 — Siemens Energy has begun field testing of its new 154 meter rotor for the 6 MW offshore wind turbine in Østerild, Denmark. The SWT-6.0-154 turbine is equipped with 75 meter long blades.

With a record rotor diameter of 154 meters, each SWT-6.0-154 wind turbine can produce 25 million kWh of clean electricity in offshore locations, enough to supply 6,000 households.

As early as May 2011, Siemens installed the first prototype of its new 6 MW turbine using a 120 meter rotor. It has now been operating successfully for well over a year.

The gearless drive technology permits a compact design: Using Siemens' Direct Drive technology the SWT-6.0 is the lightest turbine in its class, having a nacelle weight of only 200 tons. This combination of robust design and low weight reduces offshore infrastructure, installation and maintenance costs.

Siemens developed the SWT-6.0 specifically for demanding conditions in offshore locations.

The first Siemens 6-MW turbine was installed in May 2011 at the Høvsore test site in Denmark. Due to height restrictions a 120-meter rotor was used on the prototype. It has now operated for well over a year, setting new production records during the testing. The record-breaking 154 meter rotor is mounted on a 6 MW turbine installed at the new national test center at Østerild, Denmark, and formal release of the turbine took place at the inauguration of the test center on October 6, 2012.

The B75 blade used in the new rotor is characterized by high stability and low weight. Special aerodynamic profiles deliver optimum performance at a wide range of wind speeds. For the manufacturing of the B75 blade, Siemens uses the patented IntegralBlade process, which permits rotor blades to be produced from a single casting without adhesive joints. An IntegralBlade is up to 20 percent lighter than blades manufactured with traditional methods. Overall, combining an intelligent rotor blade profile with low weight helps lower the cost of wind energy.

The new SWT-6.0-154 is already a commercial success. In July 2012, Siemens entered into a Master Agreement with the Danish energy group, DONG Energy, for the delivery of 300 offshore turbines of this type. The wind turbines are expected to be used in projects off the coast of the U.K.

Siemens will soon install two more SWT-6.0 prototypes in the British offshore wind power plant, Gunfleet Sands. This will be the first time that the Siemens 6 MW wind turbine will be tested offshore. Both machines for this project will be equipped with the 120 meter rotor.

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