What is ECOES?

ECOES is a market information system supporting the electricity customer transfer process in Great Britain.

Rules and procedures relating to ECOES can be found in the MRA Agreed Procedure 15 .

Who Can Access ECOES?

  • A Supplier or Distribution Business who has commenced Market Scenario Testing;
  • Any other party, including Price Comparison Websites, which can demonstrate a benefit to the domestic electricity market from being granted access.

How to Apply for ECOES Access

Suppliers or Distribution Businesses will be provided with access to ECOES during Market Scenario Testing. Appropriate documentation will be sent during this process.

Any other party, including Price Comparison Websites, must complete the ECOES application process shown below.

To apply for ECOES access, please download, complete and return to the CAS helpdesk the following documentation:

Please contact the CAS helpdesk or call 0207 090 1024.


The ECOES User Guide, Privacy Policy, Terms of Use and User Requirement Specification can be accessed below, to enable users to understand their obligations when using ECOES.

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