Five reasons for an intelligent energy storage system    

April 2019

Five ways that your use of a smart energy storage system supports the energy transition

The stability of Germany’s power supply is being seriously challenged by the continuing expansion of volatile energy sources. Power generation by sun and wind depends on weather rather than demand. The result is overloaded power grids, slowed expansion of renewable sources, and high costs. With energy storage at home, you can change that. Here’s a list of the five most important ways that owning a smart energy storage system supports the energy transition.

Smart energy storage optimizes predictive charging and discharging procedures and maximizes the consumption of self-generated solar electricity. For example, thanks to predictive charging, you can reduce losses in yield caused by curtailment and take advantage of your solar plant’s maximum production potential. It’s also possible to intelligently control electrical consumers like heat pumps and electric cars.


As a result, you’ll not only need less coal-fired electricity from the grid, you’ll also reduce your heating oil and gasoline consumption.

The sun shines brightest in the middle of the day, whereas consumption peaks in the morning and evening. As the rate of PV expansion increases, this results in regular excess production that then puts pressure on distribution grids and threatens their stability. The situation also becomes critical when the electricity available in the grid can’t cover the demand.


Energy storage allows you to generate and consume energy at any time. It makes it possible to cap feed-in peaks and relieve the local distribution grid. At the same time, you can make a primary control reserve available on the energy market in the event of a shortage. This means that you’ll provide grid-relevant system services and help reduce the possibility of blackouts.

To reach the climate goal set in Paris of a maximum 1.5° Celsius temperature rise, PV expansion must be increased to at least 10 GW/year.[1] However, this much expansion is currently impossible due to the loads that the associated feed-in peaks would place on distribution grids. Capping feed-in peaks using energy storage systems is also a way to achieve greater PV expansion goals – especially when feed-in limits can be reduced thanks to more flexible storage options using sector coupling.



¹ Weniger et al. (2016): 
50% study: Effects of the 50% feed-in limit of the KfW subsidy program on photovoltaic storage systems

Reducing the load on grids by using energy storage can minimize high expansion costs on the level of the distribution grids despite increased PV expansion. You’ll help keep the cost of the energy transition low and electricity prices affordable.

Since EEG 2012 came into force, PV systems must be curtailed at 70 percent of the maximum active power feed-in. With a smart energy storage system, you’ll not only prevent this unused excess energy from going to waste – you’ll also make a systemic contribution, because utilizing this supplemental energy reduces the use and therefore the variable costs (arbitrage value) of other, more conventional power plants. It also reduces the secure capacity maintained by these power plants (capacity value).

Released by Marlon Hassel