Energy Storage Systems

Where this fits

How batteries, pumped storage and other technologies shift energy across time and support grid flexibility.

Core system ideas

Storage absorbs electricity at one time and returns usable energy later.

Technologies differ in response speed, power rating, energy duration, efficiency, cycle life and site requirements.

Storage can support several grid services, but one asset cannot necessarily provide all services simultaneously.

Interfaces and tradeoffs

Storage and flexibility shift energy or demand across time. Their usefulness depends on response speed, duration, efficiency, availability and the particular grid need.

What organizations measure

MW, MWh, duration, round-trip efficiency, state of charge and availability.