STOR – How to participate

On this page, you can find out more about the ways you can supply STOR to us.

Routes to market

There are two possible routes to market for STOR:

Committed STOR

Route to market open to both Balancing Mechanism (BM) and non-Balancing Mechanism participants.

A committed service provider must be available to deliver STOR during all availability windows.

The only acceptable reason for unavailability is when the unit or site is technically unable to provide the service.

Optional STOR

  • Route to market is only open to non-BM (Balancing Mechanism ) reserve providers.
  • Optional STOR providers are able to submit MW and utilisation prices via the Platform for Ancillary Services.

We're not obliged to accept and buy all of the services offered, and will not make availability payments for rejected services.


From 1 April 2021 STOR is procured through a daily pay-as-clear auction process. The auction closes at 05:00 for service delivery the following day 05:00-05:00


Interested parties must contact [email protected] if you are interested in providing STOR.

Pre-qualification requirements are to be fully compliant and tested for the Platform for Ancillary Services (PAS) or live in the Balancing Mechanism (BM).

Providers will need to sign up to the Services Terms using Form A & B.

Non-BM Providers will need to complete and return a STOR Data Template which captures the unit’s technical and operational details.

Once this has been completed NGESO will issue Form C. Providers can then participate in the daily Auction and logins to the Auction Platform will be provided.

STOR documents

These are useful documents with further details about participation in STOR.

STOR e-learning instructional video

STOR day ahead procurement training materials

These training materials are designed to help you get to grips with the new STOR Auction Platform. To access the bitesize e-Learning modules, please follow the instructions below:

  1. Watch the instructional video on how to download and extract the training files. 
  2. Download and extract the training files by clicking the button below.

Instructional video

1. External - Bulk Submissions

2. External - Bulk Withdrawing

3. External - Bulk Submission Errors

Guidance Document

Download Training

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Interested in providing STOR?

If you meet the requirements for providing this service and have read through all of the associated information in the STOR menu, then we’d like to hear from you. Please contact the Balancing Services team below.

Contact us

Additional help and support

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Read our frequently asked questions in regard to balancing services.

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Contact Balancing Services

Still stuck? See contact details for our friendly Markets team who are on hand to answer any questions you may have.