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.

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.

If you have any further enquiries, please call 01926 654611 or email [email protected]

 

Latest news and updates

NGESO response – Article 18 EBGL consultation for proposed changes to the aucti…

On 1 October 2021 we have written to Ofgem notifying of proposed changes to the STOR daily auction algorithm (as required under EBGL Article 18). The letter includes Article 18 consultation comments from market participants and NGESO’s responses.

STOR - Algorithm Changes (Q&A)

Download the question and answers from 11 August webinar

STOR - Algorithm Changes (slides)

Download the slides from 11 August webinar

STOR - Algorithm Changes (webinar)

Watch our webinar from 11 August

EBGL Article 18: STOR Assessment Principles Changes

On 12 August 2021 we launched the consultation on proposed changes to the STOR day ahead auction Assessment Principles.

Update on STOR day ahead auctions

We have today 29 July 2021 published a letter notifying of proposed changes to the STOR daily auction algorithm

Salesforce Platform webinar: Bulk upload functionality (1 July)

Watch the recording of our Bulk upload Salesforce Platform "Show and Tell" webinar.

Salesforce platform webinar (24 February)

Watch the recording of our STOR Day Ahead Procurement Salesforce Platform "Show and Tell" webinar.

STOR Season 15 Committed Windows (10 February)

Find out more about the new STOR Season 15 (2021/2022) Committed Windows, applicable from 1 April 2021 for the new STOR Day Ahead service and for any existing Long Term STOR contracts.

STOR Day Ahead Procurement webinar (15 January)

Watch the recording of our STOR Day Ahead Procurement webinar.

Key documents and guidance

To view or download any previous documents relating to STOR, visit the document library.

STOR FAQs

Download this document to see frequently asked questions (FAQs) about STOR.

New Terms and Conditions

Last updated on 10 February 2021 following the STOR day ahead procurement EBGL consultation.

Ofgem letter requesting approval for updated terms and conditions

This includes the summary of consultation responses received through the consultation process.

Committed Windows

The new STOR Season 15 (2021/2022) Committed Windows, applicable from 1 April 2021 for the new STOR Day Ahead service and for any existing Long Term STOR contracts.

Providing STOR

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.

There are particular times of the day when the STOR service is more likely to be required. These are known as ‘committed windows’.

Providers are required to be available to operate at their contracted volume during these windows.

Committed windows

Providers are required to be available to operate at their contracted volume during these windows.

Availability windows

Typically, the service is used over two pre-defined windows:

  • morning window; and
  • evening peak window.

Optional STOR may be required outside of these times.

STOR dispatch

BM providers will be dispatched through the Balancing Mechanism, while non-BM participants will be instructed and metered through the Platform for Ancillary Services (PAS)).