It will supply 44 of its N131/3900 turbines — in addition to a test turbine installed in summer 2019 — for the 175.5 De Drentse Monden en Oostermoer (DMO) wind farm in Drenthe, north-east Netherlands.
DMO is close to the central antenna field of the Netherlands Institute for Radio Astronomy’s (Astron’s) Europe-wide Low-Frequency Array (Lofar), which carries out extragalactic surveys, among other research projects.
The antennae are very sensitive to electromagnetic radiation, Nordex explained, so the order was placed on condition that the turbines’ emission level would be reduced to a predefined absolute minimum.
Nordex developed a prototype low-radiation version of its N131 turbine and installed it at the site in the summer of 2019.
Astron approved of the low electromagnetic radiation at the site, and gave the green light for the operators — developers Duurzame Energieproductie Exloermond and Windpark Oostermoer Exploitatie and electricity trader Raedthuys DDM — to place the final order in December 2019.
All electrical devices, including wind turbines, emit electromagnetic radiation, the manufacturer explained.
The levels of permitted radiation are regulated by law, which standard Nordex turbines meet.
But the level needed for the DMO project was even lower, necessitating adjustments in the turbines to meet this requirement.
Nordex’s chief sales officer Patxi Landa explained that having “successfully implemented a new technological solution”, the manufacturer can now offer its N131 turbines for other projects with “similarly demanding requirements regarding minimal electromagnetic radiation”.