Settlement Data for Capacity Providers

EMRS Settlement Calendar provides a schedule of when payments for Suppliers, CFD Generators and Capacity Provider will be invoiced, when payment is due, and if applicable, the Settlement Date and the Settlement Run.

This document sets out the main rates and amounts used in the calculation of payments under both the Contracts for Difference (CfD), Nuclear Regulated Asset Base (RAB) and Capacity Market (CM) schemes. For example, it includes the Interim Levy Rate for the CfD and Nuclear RAB schemes and Total Annual Capacity Payments for a specific Delivery year in the CM schemes.

Following customer feedback, the Key Payment Figures are now also available in an Excel format to make the data more digestible and allow customers to analyse and use it more easily.

Monthly Weighting Factors are produced annually and used in the calculation of payments under the Capacity Market (CM) scheme in accordance with Schedule 1 of The Electricity Capacity Regulations 2014.

The table below includes the Monthly Weighting Factors for Delivery Year from 1 October 2025 to 30 September 2026:

Capacity Provider’s Capacity Payments, Supplier’s Capacity Market Supplier Charge and Credit Cover requirements will vary from month to month as the above Monthly Weighting Factors are used to calculate payments.

The historical Monthly Weighting Factors from 2019/2020 to the current Delivery Year is also available. Following customer feedback, they are provided in a CSV format to make the data more digestible and allow customers to analyse and use it more easily.

Capacity Cleared Price (CCP) is adjusted for UK Consumer Prices Index (CPI) for T-4 and T-3 Auctions only.

This must be calculated no later than three months before the commencement of the Delivery Year. CPI adjusted CCP is calculated in pounds per MW and is the price at which Capacity Payments are payable in respect of Capacity Market Units (CMU) for the Delivery Year. This is detailed within the Electricity Capacity Regulations 2014 (as amended).

The table below illustrates the CCP adjusted for CPI for Delivery Year from 1 October 2026 to 30 September 2027:

*As stated in the Final Auction: Results T-4 Capacity Market Auction 2014, Auction Results: T-4 Capacity Market Auction 2015, Auction Results: T-4 Capacity Market Auction 2016, Auction Results: T-4 Capacity Market Auction 2017, Final Auction Results: T-3 2019, Final Auction Results: T-4 Capacity Market Auction 2020, Final Auction Results – T-4 Capacity Market Auction 2021, and Auction Results: T-4  Capacity Market Auction 2022. For this table it’s been converted from £ per kW to £ per MW.
** “CPI” means the UK Consumer Prices Index (All Items) published monthly by the Office for National Statistics or, if such index ceases to be published, such other index as may replace it.
*** As stated in the Electricity Capacity Regulations 2014 (as amended) to calculate the price in pounds per MW.

Further Information

The historical Capacity Cleared Price Adjusted for UK Consumer Prices Index from 2019/2020 Delivery Year to the current Delivery Year is also available.

G17 – Capacity Provider Payments illustrates a worked example of Capacity Cleared Price (CCP) adjusted for inflation in Appendix 4.

All CMUs are required to demonstrate a capacity at or above its Capacity Obligation during at least one Settlement Period on three separate Settlement Dates by 30 April of each Delivery Year. For full SPD and EP Testing requirements, please see our step 8 of our Stakeholder Support for Capacity Providers webpage.

The SPD & EP Pass Report is produced by the Electricity Settlements Company (ESC) with an automation that uses the metered volumes and actual data provided by Capacity Providers to EMRS. This means that estimated data is excluded from all calculations to ensure greater accuracy. Capacity Providers can check the report for their CMUs to understand if they have passed or not. A CMU will only be added to the report once the automation finds three separate Settlement Dates within the required window where it has met the generation requirement.

If your CMU appears on the report it means you have passed and no further action is required.

CMU Portfolios are the only CMUs that will not automatically be included in the SPD Pass Report. You will be required to follow the existing Portfolio Submission process with the EMR Delivery Body and will need to follow the process outlined in the EMR Delivery Body Guidance.

Please be aware this report is published fortnightly throughout the Delivery Year. However, during March and April, the frequency will increase to weekly as the SPD and EP window nears closure.

Where can I find additional supporting information?

Our Stakeholder Support for Capacity Providers webpage provides some additional information about this activity and includes some Frequently Asked Questions (FAQs) about the report, e.g. why your CMU is not appearing on the report, and what happens if your CMU fails to meet SPD or EPT obligations by the deadline of 30 April.

EMR Delivery Body publish the Satisfactory Performance Days and Extended Performance Guidance document and you can locate this via Agreement Management in the Knowledge Base and select the relevant CMU type (e.g., Existing) and scroll down to locate.

If you have a query relating to this report, we ask you to please contact us in the first instance.

On behalf of Electricity Settlements Company (ESC) we publish the Capacity Market Non-Payment Register in relation to the Electricity Capacity Regulations 2014, as amended.

Capacity Market Non-Payment Register sets out the names and details relating to Suppliers and Capacity Providers who have not paid an invoice under these regulations by 5:00 pm on the payment due date.

You can also view the Capacity Market Credit Cover Default Register which contains details of Suppliers who have entered Stage 1 or Stage 2 Credit Cover Default, available on the Settlement Data for Suppliers webpage.

Capacity Providers must complete these metering processes using My EMRS:

• Metering Assessment
• Metering Test (if required)
• Requesting a Test Certificate (if required)

To improve the experience for Capacity Providers and make it easier to understand their obligations, we have consolidated the deadlines for Metering Assessments and Metering Tests.

The purpose of a Metering Assessment is to determine whether a Metering Test is required. Capacity Providers must complete a Metering Assessment by providing answers to all relevant questions within My EMRS.

These are the Metering Assessment deadlines for the 2026/27 Delivery Year:

After completing the Metering Assessment, we will notify the Capacity Provider whether a Metering Test is required for a Component within a CMU.

Where a Metering Test is required for a CMU within the 2026/27 Delivery Year, Capacity Providers must obtain a Metering Test Certificate by these dates:

Capacity Market Metering Registers

On behalf of Electricity Settlements Company, we also publish the Capacity Market Metering Registers, which maintain essential details as follows:

• Metering Test requirements
• Metering Assessment requirements
• Status of DSR Components
• Metering identification codes and if there are any changes to these

The registers are available within our Settlement Data for Capacity Providers webpage.

Further information

We have further information available about these activities as follows; step three of our Stakeholder Support for Capacity Providers webpage, G1 – Capacity Market Metering, G20 – Capacity Market Metering Statement and G25 – My EMRS User Guide.

On behalf of Electricity Settlements Company, we publish the Capacity Market Metering Registers. The registers maintain details that are essential in the administration and settlement of the Capacity Market, including:

• Metering Test requirements
• Metering Assessment requirements
• Status of DSR Components
• Metering identification codes and if there are any changes to these

The registers validate metered data to ensure Capacity Providers are complying with Chapter 7 of the Capacity Market Rules. The registers will be published in accordance with the timeframes as set out in the Capacity Market Rules.

To help interpret the file name of the registers to ensure you’ve selected the correct register, let’s use T-4-2019(DY-2024)-31_07_2024 as an example. We’ve summarised this as follows:

• 2019 refers to the first Delivery Year for that auction (e.g. T-4 2014 Auction)
• DY-2024 is the current Delivery Year when we produce the report
• 31_07_2024 the last date in the filename is the date the file was generated

Do note, that the Delivery Year is always the current year, except where we show the first Delivery Year for Auctions, those Delivery Year starts in the future (e.g. T-4-2026(DY-2026)-31_07_2024).

Please also note that filtering by Company Name will display CMU rows, but not individual components. Metering Identifiers are associated with components, not CMUs, so you will not be able to view Metering Identifiers when filtering by Company Name.

Although our CM Metering Register includes details for prequalified CMUs, you are only required to complete a Metering Assessment once a Capacity Agreement has been awarded. For CMUs with a type of ‘New Build Interconnector’ or ‘New Build Generating’ the Metering Assessment deadline is based on your Long Stop Date. For further information on when to submit your Metering Assessment, please see Section 8.3 of the Informal consolidation of the Capacity Market Rules.

For more information about the registers, please see G1 – Capacity Market Metering, G20 – Capacity Market Metering Statement and G25 – My EMRS User Guide.

The Mock System Stress Event Reporting is to address data quality issues to improve the overall settlement accuracy if a System Stress Event were to happen. This reporting replicates the calculations involved in a System Stress Event. It will help Capacity Providers understand their initial position had a Stress Event occurred and be informed of any issues identified against individual CMUs.

When is the next Mock System Stress Event Reporting scheduled for 2025/26 Delivery Year?

What happens if you have any queries regarding the Mock System Stress Event Reporting received?

EMRS will be available to respond to any queries related to your Mock System Stress Event Reporting during the period 27 November – 22 December 2025 following the first reporting period, and 17 February – 12 March 2026 following the second reporting period. Please do contact our Service Desk and they’ll assign your query accordingly.

Where can I locate further information on this activity?

Further details about this reporting is available in the Latest Changes section and is directly accessible by the Latest Change – Mock System Stress Event Reporting webpage. This provides information to help support Capacity Providers in reviewing the Mock System Stress Event Reporting received.

Also, we thought it would be helpful to highlight these items:

• The format of the reporting is based on the Capacity Volume Register (CVR) and WP48 – Volume Reallocation ‘Appendix 1. Capacity Volume Register’ (p16) has the definitions of the column headers that are used.
• Frequently asked Questions on the Mock System Stress Event Reporting.
• Watch the Mock System Stress Event Webinar held on 4 July 2023 or you can view the slides that were presented.
• G18 – Capacity Market Stress Event Guide will help Capacity Providers the processes involved, their obligations, and penalties for failing to deliver in an actual System Stress Event.

The Capacity Volume Register (CVR) will be published from 24^th to 33^rd Working Day inclusive after the end of the month in which a System Stress Event occurred.

The CVR lists all the CMUs’ over or under delivery positions from a System Stress Event with the aim of facilitating Volume Reallocation amongst CMUs. It also includes the following for each Settlement Period in the previous calendar month which was a System Stress Event and in respect of each CMU:

• The capacity delivered by a CMU (i) during the Settlement Period (j), (E);
• The Adjusted Load Following Capacity Obligation (ALFCO);
• (if any) the Initial Over-Delivery Volume (IOD);
• (if any) the Initial Under-Delivery Volume (IUD);
• The Aggregated traded Capacity Market Volume (ACMV); and
• The adjusted metered output (AE), which is equal to E plus ACMV.

The CVR will be updated and republished by 5:30pm daily throughout the window. We’d encourage you to check this webpage to view the latest CVR.

Please note:

• During the Volume Reallocation window any CMVRNs received between 8.30am-4pm will be reflected in the CVR published by 5:30pm on the same day.
• CMVRNs received after 4pm will be processed the following day.
• At 5:30pm on WD33, EMRS will publish the CVR with all trades received up to 5pm.

While the Volume Reallocation window is open, your performance during the Stress Event (E) and your DSR baseline will be recalculated if EMRS receives updated data through a later Settlement Run. This may cause changes to your Over-Delivery or Under-Delivery amounts before the close of the window.

The Final Capacity Volume Register will be published on Working Day 33. This will indicate everyone’s positions as at 5pm on Working Day 33, the close of the Volume Reallocation window.

WP48 – Volume Reallocation provides details on how Capacity Providers can participate in Volume Reallocation and the timescales associated with this process.

In the Capacity Market, Capacity Committed CMUs must fulfil their Capacity Obligations during a System Stress Event. After a System Stress Event has occurred, Capacity Providers may use Volume Reallocation if they have under or over-delivered compared to their obligation. This can be done to reduce penalty charges they may face based on their performance during the System Stress Event and provide a mechanism for over-delivering CMUs to receive earlier payments for their excess capacity.

We have produced a webinar-style training video to guide Capacity Providers through the Capacity Volume Register and Volume Reallocation process. You can watch the recording on Vimeo, step through the presentation slides, and also see the glossary of data items discussed during the session.