Sinus Mowing Methods in Netherlands and Germany

TenneT, a transmission system operator in the Netherlands and in parts of Germany has collaborated with De Vlinderstichting (Dutch Butterfly Conservation) to convert voltage substations into suitable habitats for butterflies and invertebrates. Their pilot project in Netherlands uses the innovative method of sinus mowing, where grass is cut in phases and some parts are left uncut. Through this method, the area is mowed in phases with 40% of the vegetation remaining intact, and the height of the vegetation does not remain monotonous. Based on the results of its pilot study, the strategy will be applied at all its 350 high-voltage substations in the Netherlands and Germany.

Highlights

• Area is selectively mowed 3-4 times a year.
• Nature friendly maintenance of three high-voltage substations in the Netherlands has ensured the conservation of the insect population for up to 72 percent 
• The mowing regimes avoid special biodiverse spots to preserve vital flora and fauna.

About the Project

The biodiversity actions by TenneT highlight the importance of conserving natural habitats near power grids. The successes of sinus mowing have witnessed a higher insect population and diverse population of various species. The pilot project in three substation showed that by an adjustment of the mowing management, 58 to 72% of the insect population survived, which would have otherwise disappear with standard management. This method preserves space where eggs and caterpillars can survive, while also protecting the power lines from any disturbances.