The sun and wind provide clean energy, but not always exactly when it is needed. This is where battery storage comes into play. In combination with photovoltaic and wind power plants, they serve as a buffer, which absorbs production peaks - for example at lunchtime or in strong winds - and feeds in electricity as required. As a result, battery storage systems increase the time availability of renewable energies and contribute to security of supply.  

Overview of the market: Rapid growth

High costs, regulatory hurdles and limited demand have slowed down the expansion of battery storage for a long time. However, recent figures show:  The technology has left the niche:

• According to the German Solar Industry Association, the installed battery capacity has increased fivefold over the last four years: At the end of 2025, it totalled around 25 gigawatt hours (GWh)
• The majority of the approximately 2.4 million battery storage units in Germany are operated in combination with photovoltaic systems.
• In 2025 alone, 600,000 new storage units with a capacity of around 6.5 GWh were added.¹
• Large-scale battery storage systems are growing particularly dynamically: Its installed capacity increased by around 71 percent to 4.0 GWh in 2025.²

Technological advances and cost efficiency drive growth

The massive build-up of production capacities, especially for global electromobility, has triggered enormous economies of scale. As a result, prices per kilowatt hour for lithium-ion batteries fell by almost 80 percent between 2013 and 2023.³

The challenge: The imbalance between generation and storage

The rapid expansion of battery storage is also crucial, as electricity generation from renewable energies is currently growing faster than the grid infrastructure - including storage capacities. Consequences: In the event of local surpluses of electricity, plants have to be partially reduced, which means that generated energy is lost. Conversely, in periods of high demand, the risk of bottlenecks increases, which today still often have to be compensated for by fossil power plants. This imbalance increases the cost of security of supply and thus slows down the energy transition.

Despite dynamic growth, storage capacity is currently insufficient. The Fraunhofer Institute for Solar Energy Systems ISE forecasts a storage requirement of 100 to 170 gigawatt hours for 2030 in order to achieve the German climate targets.⁴

Investment opportunities and klimaVest’s contribution

The storage boom is opening up new investment opportunities. klimaVest invests primarily in tangible assets from the areas of renewables, electricity grids and - in the future - storage, thus opening up private access to the energy transition. By pooling capital, klimaVest is accelerating the expansion of this system-critical infrastructure and at the same time making a contribution to climate change mitigation - according to the criteria of the EU Taxonomy, which defines which investments are considered sustainable.