Germany's last nuclear power plants will go off the grid in mid-April, and coal-fired power will also be history by 2030. Even if there are enough wind turbines by then, the power supply could become patchy.

The construction cost subsidy from grid operators is a barrier to building batteries for electricity storage, says Benedikt Deuchert* of Kyon Energy.

Electricity prices and grid frequency, generation and consumption fluctuate. Operators of battery storage systems in the megawatt range are taking advantage of this. An overview.