German wind developer Landwind-Gruppe and the Dresden-based supplier Light:Guard have signed an exclusive three-year framework agreement to equip wind turbines with demand-controlled night-time marking (BNK). The contract covers around 130 turbines in more than 20 wind farms.
BNK keeps the red aviation warning lights on turbines switched off while the airspace is clear. The system monitors the airspace around a wind farm and, when an aircraft approaches, reactivates the lights so that they blink as before. Most of the wind farms in the new agreement are still to be built, while some are repowering projects.
The deal extends an existing relationship: Landwind and Light:Guard concluded a first framework agreement in 2021. Light:Guard also supplied the BNK equipment at Landwind’s Söllingen wind farm in Lower Saxony, which recently opened. According to the companies, the contract was sealed at WindEnergy Hamburg 2026.
Landwind managing director Bärbel Heidebroek said the company sees reduced light pollution, alongside the municipal levy paid to host communities, as part of making local residents benefit from the energy transition. Light:Guard senior sales manager Claudia Flörke said the aim was to make the nights around Landwind’s wind farms darker.
Landwind, based in Gevensleben, operates wind farms with a combined capacity of around 400 MW that generate more than 850,000 MWh a year, according to the company. Light:Guard says it has switched off the lights on more than 3,500 turbines in Germany since it began working on BNK in 2008, and it now also offers a system for external shutdowns, such as switching turbines off during mowing.
