Battery Energy Storage System (BESS)

An electrochemical Energy Storage (ES) device that stores the output of Generation Plant in a manner that may be discharged for use later.  All charging and discharging of a BESS is under the control of a dedicated battery management system.

BESS chemistries vary in their key technical characteristics including rated Power output (kW/MWh) and Energy Storage capacity (kWh/MWh), charge/discharge profile, operational longevity and round-trip efficiency.  Common BESS types include Lithium-ion, Lead-acid and Redox Flow.

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