Climate & Environment
Storage Capacity
How much energy a storage system can hold and how fast it can deliver it — the two numbers that define grid flexibility.
Definition
Storage capacity describes the size of an energy storage system along two dimensions: power capacity (megawatts — how fast it can charge and discharge) and energy capacity (megawatt-hours — how long it can sustain that output). The ratio defines application: lithium-ion batteries provide seconds-to-hours of storage for grid services and daily shifting, while pumped hydro, hydrogen and thermal stores address days to seasons. Global storage deployment is growing rapidly as the principal enabler of high-renewables grids.
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