The capacity of the large storage facility is 103MW. The storage facility is intended to charge production surpluses from photovoltaic and wind turbines twice a day via the Schleswig-Holstein Netz AG high-voltage network and feed them back again during the morning and evening demand peaks.
Eco Stor has started building a storage facility in Bollingstedt with 103MW of output and 238 MWh of capacity. The system is currently one of the largest battery storage power plants coupled with photovoltaics and wind power in Germany. The project in Schleswig-Holstein is intended to be just the start of a series of storage power plants for the German-Norwegian storage company, which together have several gigawatts of output .
The groundbreaking ceremony on the approximately 1.2 hectare site in the Gammelund district took place last Friday, as Eco Stor announced. Two “ECO STOR ES-50C” blocks will now be built there, each with around 51.7 MW of output and 119 MWh of storage capacity. Each block includes a 110 kilovolt substation, 16 container stations for inverters and transformers and 32 containers for the lithium-ion batteries.
Eco Stor plans to charge the storage twice a day with surpluses from photovoltaic and wind turbines. This electricity will then be fed back into the power grid during the morning and evening demand peaks. According to Eco Stor, around 170,000 multi-person households can be supplied with renewable electricity for two hours each morning and evening.
With its projects like in Bollingstedt, Eco Stor wants to “gradually close the gap in security of supply that is still open”. Storage of this size could be used to balance supply and demand and would also enable further expansion of photovoltaics and wind power.
The storage should be linked to the electricity trading marketplaces in real time in order to be able to react to fluctuations. “Electricity prices are becoming increasingly sensitive to the weather. With increasing production of wind and solar power, more and larger storage systems and their balancing effect are needed. “They ensure more stability in the network, affordable prices and a clean mix of renewable energy,” said Eco Stor managing director Georg Gallmetzer.
Eco Stor is once again drawing attention to its call for changes to trade tax legislation. So far, the local communities have hardly benefited from such projects. Therefore, as with ground-mounted photovoltaic systems and wind farms, the rule should apply that 90 percent of the trade tax incurred flows to the local municipalities of such projects. This could support structural change in rural regions. In addition, such a regulation would promote acceptance among the population for such infrastructure projects, argues Eco Stor.
