Energy storage in Europe is gaining more attention in conjunction with the climate objectives of the European Union. Storage can play an important role in the decarbonisation of the electricity sector by improving the integration of intermittent, weather dependent renewable sources and better aligning production with consumption. Moreover, the total capacity of the electricity system does not have topeak consumption or be adapted to the peak generation of renewables. This allows for savings in the expansion of generating capacities as well as the development of the transport and distribution infrastructure. Storage also has the potential to be commercially viable since it enables the sale of electricity during periods of high demand, and thus high prices.