Dunkelflaute

Dust, sand, and salt storms need wind to deliver their destruction. But sometimes the lack of wind creates its own problems.

As the world embraces renewable energy, a dramatic sounding German word has entered the meteorological conversation: Dunkelflaute. Combining the German words dunkel ('dark') and Flaute ('calm'), it describes those periods when the sun does not shine, the wind does not blow, and renewable systems fail to deliver enough energy.

Dunkelflaute typically occurs in winter. Think of short days, cloudy skies, and high-pressure systems that leave turbines idle and solar panels underperforming. It is a phenomenon that occurs exactly when demand for heating and electricity rises.

For countries heavily reliant on wind and solar, this is a serious challenge. Backup capacity is therefore essential but is expensive, and nations already coping with dust, sand, or salt storms often lack the resources to prepare adequately.

Dunkelflaute highlights a real issue in the clean-energy transition: renewables are vital, yet reliable backups always remain necessary.