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Germany鈥檚 boom in stationary batteries linked to solar PV systems accelerated last year, doubling the total number of units to more than one million, solar industry association BSW. The batteries have a combined capacity of 12 gigawatt-hours - enough to power 1.5 million 2-person households for a day. 鈥淭he expansion of solar electricity storage systems has picked up speed rapidly. Both the total number of solar batteries installed and their storage capacity have doubled in just one year,鈥� said the lobby group. "When installing new solar power systems on private buildings, electricity storage systems are now standard. More and more companies are also storing solar power from their roofs to use it around the clock," said the association鈥檚 director, Carsten K枚rnig. He added that the market for home and commercial storage systems grew by over 150 per cent in 2023.

The industry group lamented that current policies still underestimate the potential of battery storage systems, and that market barriers continue to slow their spread. Against this backdrop, BSW welcomed the economy and climate ministry鈥檚 proposals for a storage strategy published in December, but said the draft didn鈥檛 address central strategic questions regarding the role of batteries in tomorrow鈥檚 electricity system. Storage systems should be considered a central pillar of the electricity system, on par with generation, grid, and consumption, the industry association said.

Storage will become key in the next phase of the energy transition, as Germany aims to cover 80 percent of power demand with renewable sources by 2030. A traditional electricity system doesn鈥檛 require much storage because power generation can be adjusted to match demand. This changes dramatically as the system uses more renewable energy, as power generation from wind turbines and solar PV systems depends on the weather. This means that production often dramatically exceeds demand but also that current power production can fall well short of what is needed at a given moment.聽