Energy storage facility doubles as spare part warehouse
At the enercity location in Hannover (Germany), 1,800 of a total of 3,240 battery modules from the third-generation smart electric drive vehicle fleet were bundled to form a stationary storage facility and prequalified by the transmission grid operator responsible for providing primary control power. The plant thus already provides the electricity market with an output of 5 MW. The completion of the entire plant with a total final storage capacity of 17.4 MWh is planned for the first quarter of 2018.
In contrast to similar energy storage systems built from car batteries, this system does not utilize used batteries for a second use, but instead new batteries. The lithium-ion batteries intended for automotive applications provide a system service on the primary control power market prior to their use in Daimler AG electric vehicles. By the “living storage” of the spare batteries, the partners create an attractive business case, which can only be realized in this form by an automotive manufacturer and an energy supply company.
The partners benefit from their respective expertise in the fields of energy management, system services, battery development and production as well as marketing. Daimler subsidiary Accumotive produced the automotive lithium-ion battery systems. The development and production of the battery storage system was carried out by Daimler subsidiary Mercedes-Benz Energy. enercity is responsible for marketing the battery storage capacity on the standard power market.
By marketing the storage capacity stored on the German market for primary control capacity, the business model makes an important contribution to stabilizing the electricity grid and at the same time to the efficiency of electromobility. In the event of increasing fluctuations in the feed-in of electricity from renewable energies, such as wind and solar energy, such storage facilities are used for the optimum regulation of a constant grid frequency to be stabilized. With their storage capacity, they compensate for energy fluctuations with virtually no loss – a task that is currently performed by mainly high-speed turbines, i. e. rotating masses in large power plants. Around half of the planned system trains with an output of 5 MW are already connected to the grid.
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