Mid-term (Y-1) Stability Market
In 2021 we launched the Stability Market Design innovation project to explore the design for the enduring stability market.
This project has recently concluded and AFRY summarised their recommendations in an end of project webinar on 17 July 2023 (slides and recording available on the stability market design webpages).
As a result of this work, in our 2023 Markets Roadmap we set out the aim to procure stability services across several timescales:
- Long-term (Y-4)
- Mid-term (Y-1)
- Short-term (D-1)
We determined that the next step in launching our suite of Stability Markets is to initiate the mid-term (Y-1) market, starting with a request for information (RFI).
28 September 2023 – ESO have now completed the RFI review process and plan to launch the EOI phase in October 2023.
In the interim, please refer to the RFI generic query log that has been created to summarise the generic queries that were received during the RFI process and ESO’s responses.
Thank you for all of the feedback received, which has been used to finalise the details of the mid-term (Y-1) Market.
18 August 2023 – The ESO’s request for information (RFI) regarding the Stability mid-term (Y-1) Market has now closed.
Thank you to the parties that provided responses, which will be used to help design and launch the market.
If you have any questions, please get in touch using [email protected]
17 July 2023 – we ran an industry webinar signifying the conclusion of the Stability Market Design innovation project, followed by the launch of the mid-term (Y-1) Stability Market RFI.
Mid-term (Y-1) Stability Market: Round 1, delivery year 2025/2026
Launching the mid-term (Y-1) Stability Market is the first step in implementing the enduring Stability Market.
On 18 August 2023 ESO concluded a request for information (RFI) which sought feedback from industry to help design the mid-term market. Using this market feedback ESO continued to refine the design of the mid-term market, launching the first round of the mid-term (Y-1) Stability Market on 3 October 2023. On 31 May 2024 ESO received tender submissions, meaning the tender window has now closed for this first round. ESO will now assess these tender submissions in line with the published Contract Award Criteria before completing Contract Award.
Round 1 (2025/2026): process summary
Step 1 – Expression of interest (EOI) and consultation window: October 2023
This step initiates the first round of the mid-term (Y-1) Stability Market, seeking solutions that can help meet our Stability needs between 2025 and 2026.
During this window, market participants are invited to express their interest in participating in the first round of the mid-term (Y-1) Stability Market. Market participants must formally express their interest to be invited to the invitation to tender (ITT) stage.
NESO has published draft tender documentation which we welcome market feedback on as part of the consultation process. Please refer to the "documents and materials" section further down to access the EOI documentation.
Key dates:
- Consultation feedback deadline: 3 November 2023 (5pm)
- Expression of interest "early bird" deadline: 1 December 2023
- Expression of interest "backstop" deadline: 26 January 2024
Please note as a result of consultation feedback, NESO may make amendments to the tender requirements and/or documents prior to the ITT stage.
Step 2 – Launch invitation to tender (ITT): December 2023 (complete)
Market participants who express their interest in participating during the EOI window will be invited to the ITT stage. At this stage NESO will publish the ITT documentation.
Step 3 – Invitation to tender (ITT) window: Complete
This is the period of time allocated for market participants to develop their technical and commercial submissions. Those participating must return their tender submissions to the NESO by the stipulated deadline to be considered for contract award.
Step 4 – Contract award: planned
NESO has published the Tender Results for Tender Round 1 (Delivery year 2025/2026).
Documents and materials
Expression of interest and consultation stage
EOI and Consultation Webinar
Please note that content covered in these webinars is subject to change as a result of consultation feedback.
| Name | Published |
|---|---|
| Mid-term 2025/26 EOI technical webinar | 27 Oct 2023 |
| Mid-term 2025/26 EOI commercial webinar | 27 Oct 2023 |
| Mid-term 2025/26 EOI technical webinar slides | 27 Oct 2023 |
| Mid-term 2025/26 EOI commercial webinar slides | 27 Oct 2023 |
| Mid-term Y-1 25/26 EOI stage generic query log V1 | 27 Oct 2023 |
| Mid-term Y-1 25/26 EOI stage generic query log V2 | 29 Nov 2023 |
| Mid-term Y-1 25/26 EOI stage generic query log V3 | 12 Dec 2023 |
| Mid-term Y-1 25/26 EOI stage generic query log V4 | 10 Jan 2024 |
Invitation to Tender (ITT) documents
The Mid-Term (Y-1) Stability Market tender is being facilitated using NESO’s internal tender platform, and therefore only a portion of the tender documents are available on this webpage.
Mid-Term (Y-1) Stability Market: Round 2, Delivery Year 2026/2027
In December 2023 NESO launched the first tender round under the new Mid-Term (Y-1) Stability Market. Following a successful procurement event, NESO is concluding contract award and expects to notify the industry of the tender outcome in November 2024.
Today, 8th November 2024, NESO is pleased to announce the Expression of Interest and consultation phase for Mid-Term (Y-1) Stability Market: Round 2, Delivery Year 2026/2027 is now open.
Round 2 (2026/2027): Process Summary
Step 1 – Expression of Interest (EOI) and Consultation Window – November 2024
During this window, market participants are invited to express their interest in participating in the second round of the Mid-Term (Y-1) Stability Market. Market participants must formally express their interest to be invited to the Invitation to Tender (ITT) stage.
NESO has published draft tender documentation which we welcome market feedback on as part of the consultation process. Please refer to the ‘Documents and Materials’ section further down to access the EOI documentation.
Key Dates
- Commercial & Technical Webinar 21 November 2024
- Consultation Feedback Deadline 29 November 2024
- Expression of Interest ‘Early Bird’ Deadline 10 December 2024
- Backstop deadline 24 January 2025
Please note as a result of consultation feedback, NESO may make amendments to the tender requirements and/or documents prior to the ITT stage.
Step 2 – Launch Invitation to Tender (ITT) – Planned
Market participants who express their interest in participating during the EOI window will be invited to the ITT stage. At this stage NESO will publish the ITT documentation.
Step 3 – Invitation to Tender (ITT) window - Planned
This is the period of time allocated for market participants to develop their technical and commercial submissions. Those participating must return their tender submissions to the NESO by the stipulated deadline to be considered for contract award.
Step 4 – Contract Award - Planned
Market participants whose tenders are successful will be notified by ESO and can begin work to meet their contractual requirements.