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Netherlands

Netherlands

Turbine failure at Windpark Kreekraksluis under investigation

All but one of the 26 NedWind 500 kW turbines that make up the Windpark Kreekraksluis from 1995 are back online following the self-destruction of a single unit at the end of October. A blade tip hit the tower after the turbine's main axle broke in fair weather, says Mathieu Kortenoever of E-Connection, which operates the wind plant. All the turbines where shut down for safety reasons. An investigation of cracks in the failed main axle by Dutch specialist firm Stork FDO has not revealed the reason for them. No cracks have been identified in the 25 turbines put back in operation on January 4, although they will be periodically examined using ultrasound tests. Windpark Kreekraksluis Ltd is owned by Delta Energy, which assumed full ownership from Dutch energy firm Nuon following an agreement in spring 2005. Delta previously owned 35% of the plant. Kortenoever estimates the closure of the wind station cost around EUR 130,000 a month. Delta is applying for permission to retrofit the site with fewer, larger turbines, perhaps replacing the 26, 500 kW machines with 18, 3 MW units, says Kortenoever. The NedWind 40 turbines have a rotor diameter of 41 metres and hub height of 40 metres. They are lined up in two rows along the Scheldt-Rhine canal and produce an annual average of about 21 million kWh, enough power for 7000 households. From 1990-1995, the site was occupied by a smaller wind farm. NedWind was acquired by Danish company NEG Micon in 1998, before its merger with Vestas in 2004.All but one of the 26 NedWind 500 kW turbines that make up the Windpark Kreekraksluis from 1995 are back online following the self-destruction of a single unit at the end of October. A blade tip hit the tower after the turbine's main axle broke in fair weather, says Mathieu Kortenoever of E-Connection, which operates the wind plant. All the turbines where shut down for safety reasons. An investigation of cracks in the failed main axle by Dutch specialist firm Stork FDO has not revealed the reason for them. No cracks have been identified in the 25 turbines put back in operation on January 4, although they will be periodically examined using ultrasound tests. Windpark Kreekraksluis Ltd is owned by Delta Energy, which assumed full ownership from Dutch energy firm Nuon following an agreement in spring 2005. Delta previously owned 35% of the plant. Kortenoever estimates the closure of the wind station cost around EUR 130,000 a month. Delta is applying for permission to retrofit the site with fewer, larger turbines, perhaps replacing the 26, 500 kW machines with 18, 3 MW units, says Kortenoever. The NedWind 40 turbines have a rotor diameter of 41 metres and hub height of 40 metres. They are lined up in two rows along the Scheldt-Rhine canal and produce an annual average of about 21 million kWh, enough power for 7000 households. From 1990-1995, the site was occupied by a smaller wind farm. NedWind was acquired by Danish company NEG Micon in 1998, before its merger with Vestas in 2004.

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