Younicos claims that the unit is the first commercial battery power plant in Europe and helps in integrating wind and solar energy.
The battery unit, which was built for German green electric utility Wemag, is made up of 25,600 lithium-manganese oxide cells, supplied by Samsung SDI.
Five medium-voltage transformers link the battery to both the regional distribution and the 380kV high-voltage grids.
Younicos said apart from receiving first development funding of €1.3m from the German Federal Environment Ministry’s innovation program, the unit will compete in the primary frequency regulation market.
Younicos CTO Clemens Triebel said: "Up to now, the power grid has been largely stabilized by inflexible coal-fired power plants, which can only use a fraction of their output for control power. This blocks space in the grid, increasingly forcing wind and solar generation to be taken offline.
"Our battery park avoids this economic impact because it is much faster and more precise than a thermal power station. Thus, our 5 megawatt battery in Schwerin provides the same control power as a conventional 50 megawatt turbine."
Wemag CTO Thomas Pätzold said: "In the WEMAG grid area, more than 80 percent of the power consumed already comes from wind and solar generation – making us a front runner in renewable energy. We therefore feel committed to bringing to market new, more efficient solutions for the energy transition.
"Our battery storage unit shows the way forward: it is the best technical solution for smoothing naturally intermittent renewable feed-in, and it is also commercially very attractive."