10-07-202656
Renewable Energy and Energy Storage Systems. Germany and China are actively deploying battery storage systems alongside solar and wind energy — these are industrial-scale rechargeable systems, distinct from ordinary batteries, designed to stabilise power grids, maximise the effective use of renewable energy sources, and provide backup electricity supply.
In March 2025, the largest battery-based energy storage system was connected to the grid in the German city of Bollingstedt, in the federal state of Schleswig-Holstein. The system has an installed capacity of 103.5 MW and an energy storage capacity of 238 MWh.
In China, energy storage technologies are advancing along two principal directions: battery storage and pumped hydro storage. The latter constitutes a type of energy storage system — like battery storage, it is an industrial-scale rechargeable system aimed at grid stabilisation, efficient utilisation of renewable energy, and backup power provision. Newly commissioned pumped hydro power plants in China are supporting the growth of wind and solar energy sectors; the total installed capacity of facilities currently under construction in this field stands at 89 GW.