Project development company RES Deutschland GmbH (Renewable Energy Systems) has won a contract put out to tender by Versorgungsbetriebe Bordesholm (VBB) for the construction of a 10-MW battery storage system to supply reserve power. In addition to supplying an operating reserve, the battery storage system will operate as a stand-alone power system to provide back-up power to the region – sourced primarily from renewables – in the event of a mains network failure. The state of Schleswig-Holstein is providing financial support to fund the pilot of the stand-alone power system. For global project development company RES, the project is the first multi-megawatt storage project on German soil.

The dismantling of conventional power stations and the increased use of renewable energy sources means that new, more flexible frequency stabilisation solutions are required. Depending on the situation, and whether there is an excess or shortfall of energy in the supply network, the use of power from volatile sources can cause fluctuations in frequency which, in turn, can result in problems. By installing a new battery storage system on its own site, Versorgungsbetriebe Bordesholm (VBB) is helping to stabilise the network. The municipality already meets 75 per cent of its annual energy needs with renewable sources. The storage system is designed to provide energy for a limited geographical area – with no interruption to supply – in the event of a fault in the main grid or the total failure of the upstream network. The Bordesholm battery storage system will boast a marketable output of 10 MW, with a storage capacity of 15 MWh.


Lithium-ion Battery


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