The Enduring Auction Capability (EAC) is being designed to deliver co-optimised procurement for our day-ahead Frequency Response and Reserve products. It is envisioned that this method of procurement will allow us to meet our needs in the most efficient way, while enabling providers to participate in multiple markets.

In the future, this procurement method could extend to new services and products. This may require different algorithms for auctions at various regularity, such as intra-day, day-ahead, and so on.

We are eager to understand your views and so encourage you to contact us if you have any questions, feedback or would like to set up a meeting with the team.

Market information

Please find below information on previous events we have held for the EAC, including webinar recordings and slides available to download.

The EAC market design report

This report provides a description of the EAC design and N-SIDE’s power matching algorithm. The purpose of this supporting document is to provide clarity and transparency on technical aspects of the EAC calculations, including the objective function of the algorithm, co-optimisation, the order format and associated functionalities, and the approach to determining clearing prices.

Download the market design report

Market design explainer

We have published an explainer document, which gives an overview of some of the elements of the market design, and contains some simple examples of the construction of basic sell orders.

Download the market design explainer

Mock auction guidance document 

We have also published a mock auction guidance document, which gives an overview of how to register for the mock auctions, as well as the upcoming key dates.

Download the mock auction guidance document

EAC - Production environment access guidance document 

We have now published a guidance document for the production environment, this gives an overview of how to register for the production auctions, as well as gaining your API tokens.

Download the access guidance document

You can also download our Q&A document which will be regularly updated. 

EAC webinar – 23 May 2023

On 23 May 2023, we held a webinar to update industry on the proposed sell-order design, a demo of the new UI, as well as project updates. Below you can find the relevant material shared during the webinar as well as an API quick start guide:

Download slides Watch the webinar Download the Q&A API Quick Start Guide


Detailed Market Design – 17 February 2023

On 17 February 2023, we held the second webinar to update industry on the progress we have made on the Detailed Market Design of the EAC project.

Download slides Watch the webinar


Industry Webinar – 15 December 2022  

On 15 December 2022, ESO held the first webinar to update industry on the progress we have made on the High-Level Market Design of the Enduring Auction Capability (EAC) project, including the feedback we have received from industry to date. 

Download slides Watch the webinar

EAC results file for data portal

As we proceed with development of the Enduring Auction Platform (EAC), we can now provide templates of the results files that market providers will be able to access post-auction via the data portal.

EAC results - sell orders

EAC results format

EAC results summary 

EAC results by unit

EAC results - buy orders


Sell Order Design – 19 January 2023 

As part of the SMP Show and Listen workshop on 19 January 2023, we presented the format of the sell order design for the EAC as part of our work for the Detailed Design phase of the project.  

Download the EAC Sell Order Design

Watch the EAC Sell Order Design presentation

We recently held a number of consultation drop-in sessions, providing market participants with support following the release of Article 18 EBR consultation for the Enduring Auction Capability (EAC). 

Below you can find the session recordings alongside an example spreadsheet for calculation of settlement values that participants can use to visualise the changes to the settlement calculation, and see how much they would be paid (or pay ESO) for different clearing prices and performance factors.

EAC Roadmap - July 2023

Consultation drop-in session - 05/07/23

Consultation drop-in session - 07/07/23

Consultation drop-in session - 12/07/23

Example spreadsheet for calculation of settlement value

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