Schischke, EvaEvaSchischkeGrevé, AnnaAnnaGrevéEhrenstein, UlrikeUlrikeEhrensteinDoetsch, ChristianChristianDoetsch2024-02-122024-02-122024https://publica.fraunhofer.de/handle/publica/46202310.1007/978-3-031-48359-2_4This chapter provides an overview of energy storage technologies besides what is commonly referred to as batteries, namely, pumped hydro storage, compressed air energy storage, flywheel storage, flow batteries, and power-to-X technologies. The operating principle of each technology is described briefly along with typical applications of the technology. Additionally, insights into the ecological footprint of the different energy storage systems are presented.enenergy storageelectricity marketnon-battery technologiesPower-to-XEcological footprintbook article