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ESO
Reserve services
At certain times of the day, we need access to sources of extra power in the form of either increased generation or demand reduction. This enables us to manage a greater than forecast electricity demand on Britain's transmission system. These additional power sources available to us are called 'reserve services.'
Different sources need different timescales in order to be ready to deliver the required service. In this section, we list reserve services according to their timescales (shortest timescales first):
Balancing Reserve
Regulating reserve is used to manage energy imbalance between generation and demand.
Slow Reserve
Slow Reserve, separated into Negative Slow Reserve (NSR) and Positive Slow Reserve (PSR), will be the first of our series of new Reserve products.
Quick Reserve
Quick Reserve, separated into Negative Quick Reserve (NQR) and Positive Quick Reserve (PQR), is aimed primarily for reacting to pre-fault disturbances to restore the energy imbalance quickly.
Short-term operating reserve (STOR)
Short term operating reserve (STOR) is a service that provides additional active power from generation or demand reduction.
Fast reserve
Fast reserve provides rapid and reliable delivery of active power through increasing output from generation or reducing consumption from demand sources.
Demand Turn Up
Developed to allow demand side providers to increase demand as an economic solution to managing excess renewable generation when demand is low.
Super SEL
The ability for synchronous generation to reduce their minimum generation level (SEL) in times of low demand on the system.
BM start up
On-the-day access to additional generation Balancing Mechanism units (BMUs) that would not otherwise have run.
Replacement Reserve (RR)
Provision of an increase and decrease of active power between participating TSOs.