Energy Storage

From lithium to long-duration.

Grid-scale storage, long-duration technologies, pumped hydro, thermal storage and hybrid plants.

Energy storage lets a power system move electricity through time: charging when power is cheap or abundant and discharging when it is scarce. It ranges from lithium-ion batteries that respond in milliseconds to pumped hydro reservoirs and emerging long-duration technologies that can deliver power for days.

This hub tracks grid-scale deployment, the market rules that let storage earn revenue, and the technologies competing for long-duration roles, including flow batteries, iron-air and thermal storage. We look at round-trip efficiency, duration, degradation and revenue stacking, because those determine whether a project is built. Grid-scale storage has grown faster than almost any other energy technology in recent years, and the guides below explain the basics before the briefs add the latest developments.