Battery Storage - Q2 State of Charge

Research evidence excerpt

Battery Storage - Q2 State of Charge

Investment Companies

Equity Research

July 2, 2026

Battery glossary

Term Definition

Ancillary services Services that help to maintain operational grid requirements based on energy frequencies. Service providers are generally

paid based on availability to discharge or absorb energy from the grid within a defined time period

Balancing mechanism (GB) NESO's tool to maintain the balance between electricity supply and demand in real-time (or near delivery). From the battery

perspective, this would be similar to trading in the spot market

Battery management system Software sytem and related hardware that oversee the battery packs' condition, status and actions

CAISO California Independent System Operator, electric system operator in California

Capacity market A mechanism to secure future electricity supply. Capacity market contracts are generally paid based on the availability of the

capacity during high demand periods and are generally secured a year or more in advance

Day-ahead market A market for trading electricity to be delivered the next day

Duration The amount of time the battery can charge or discharge at full capacity, generally stated in hours and can be calculated by

installed capacity in MWh divided by Installed capcity in MW

Dynamic responses (GB) Includes dynamic containment (DC), dynamic moderation (DM), dynamic response (DR). Modern ancillary services that react

to small frequency deviations of the grid

ERCOT Electric Reliability Council of Texas, electric system operator in Texas

GC0166 Grid code change that aims to introduce new parameters for batteries in the balancing mechanism

Installed capacity (MW) The maximum electrical output the battery can provide to the system at any given moment, generally stated in MW