With 89 GW of installed capacity as of 2024, Europe is consolidating its energy transition through an unprecedented growth in storage technologies, led by pumped hydro and electrochemical batteries. The main energy storage method in the EU is by far 'pumped storage hydropower', which works by pumping water into reservoirs when there is an electricity surplus in the grid - for example on a sunny or windy day - and releasing it when more energy is needed. The EU's new state aid framework will be key to adding a further 128 GW by 2030, according to the. There are 147 energy storage projects under construction in Europe, with a total capacity of 14 GW, according to the European Energy Storage Inventory, launched by the European Commission. The European Energy Storage Inventory comprises operational, under construction, permitted, and announced. The latest edition of the European Market Monitor on Energy Storage by the European Association for Storage of Energy and LCP Delta, released on 31 March, highlights Europe's rapid expansion in energy storage capacity, which rose to 89 GW by the end of 2024. At. Pumped hydro is the most widely used technology for energy storage in Europe and worldwide, but batteries and hydrogen have come into the spotlight over the last decade as a recent trend in the energy storage market. However, despite an exponential growth in Europe's battery energy storage.