Short term operating reserve (STOR)
At certain times of the day we may need access to sources of extra power to help manage actual demand on the system being greater than forecast or unforeseen generation unavailability.
We have published documents on the new PAS project that we are developing to provide a new dispatch system for Non-BM STOR. These can be found under the Technical Requirements tab under the PAS Documents heading.
We have published a modified OCP which in addition to the proposals in the original OCP, published on 6th June 2018, includes simplified contract terms and requirements as part of the Demand Connection Code.
The deadline for responses to this modified OCP is 5pm on 30th August.
Responses provided to the initial OCP will be considered as part of this modified OCP.
Where it is economic to do so, we will procure sources of extra power ahead of time through the STOR service. Providers of the service help to meet the reserve requirement either by providing additional generation or demand reduction.
The requirement for STOR varies depending on time of year, week and day.
Both Balancing Mechanism (BM) and non-BM participants with a connection to either the electricity transmission or distribution network are able to provide STOR.
The service is open to any technology with the ability to increase generation or reduce demand by at least 3 MW.
Current STOR providers are located throughout Britain, although providers closer to high demand areas, including south east England and Wales, are more desirable.
There are particular times of the day when the STOR service is more likely to be required. These are known as ‘availability windows’.
Providers are required to be available to operate at their contracted volume during these windows.
Typically, the service is used over two pre-defined windows:
- morning window; and
- evening peak window.
STOR may be required outside of these times.
BM providers will be dispatched through the Balancing Mechanism, while non-BM participants will be instructed and metered through STOR Dispatch (SRD PC).
The installation of STOR dispatch is undertaken by external parties and takes six months to complete.