Green Flexibility to develop 80 MWh battery for experimental German grid project

Energy storage developer Green Flexibility will supply a 40 MW/80 MWh battery energy storage system (BESS) in Bavaria to the “Feed-in Socket” pilot project being launched by grid operators LEW Verteilnetz and Bayernwerk.

The companies are developing a more cost-efficient and grid-neutral approach to integrating clean energy into their networks, using anticipated grid capacity planning and targeted allocations for renewables and energy storage sites. Grid-neutrality means battery storage systems require no grid capacity during periods when there is high feed-in, via the socket, of solar and wind power. That should ensure transformer and power grid will be “permanently utilized optimally,” and means the connected generation and storage sites don’t have to be scaled down in capacity in line with the profile of peak grid demand.

The grid partners received 20 applications to participate in the pilot project, with a total capacity of 445 MW, and only seven secured contracts. Green Flexibility’s project was one of three BESS, with the other two having a combined energy capacity of 21 MW. A 22 MW wind farm and 44 MW of solar, spread across three sites, complete the project line-up.

“The possibility of operating our battery [energy] storage system in Balzhausen in a grid-neutral manner underscores our commitment to creating not only innovative but also grid-friendly solutions for the energy transition,” said Christoph Lienert, co-founder and managing director of Green Flexibility. “It’s about driving the energy transition forward without neglecting regional grid requirements – together with all stakeholders and innovative concepts such as the feed-in socket.”

To successfully absorb excess solar and wind electricity generation on the pilot grid, the Balzhausen BESS will have to operate in response to more than just electricity price signals. Green Flexibility was unable to provide further details, when contacted by pv magazine, but said information would be supplied, in collaboration with LEW Verteilnetz, in due course.

Commissioning of the €40 million ($46 million) BESS is planned in the fall.

From pv magazine Deutschland.

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