Autarky refers to the desire to be independent and self-sufficient. Many neighbourhoods and villages work on self-sufficient living concepts; self-sufficient in food, energy, water and waste processing. For example, by 2030 the Dutch island of Texel wants to be completely autarkic in the field of energy. The climate crisis and high energy prices have put autarkic living on the agenda again.

When it comes to energy and climate policy, Germany is happy to present itself as a proud forerunner. Similarly, the municipality of Bordesholm in the German state of Schleswig-Holstein. It lies in the headland with Denmark above Hamburg and has almost 8,000 inhabitants.

The storage of sustainably produced energy contributes to the pursuit of Autarky. Bordesholm has a scoop, as far as we know. For a short period of one hour they disconnected from the electricity grid showing that local energy networks could be powered stably and reliably using renewable energy.

The local utility company Versorgungsbetriebe Bordesholm (VBB) currently supplies 75% of its electricity demand with renewable energy sources, which are directly connected to the public electricity grid. VBB wants to increase the figure to 100%. The battery storage system with a peak capacity of 10 MW and a storage capacity of 15 MWh contributes significantly to this. In addition, the sustainable energy storage system ensures stability of the mains frequency of 50 Hz and is a backup in the event of a power failure.

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