Capacity Market Register
The EMR Delivery Body (DB) has an obligation to create and maintain Capacity Market Registers (CMR) for all capacity market auctions. Each CMR holds a record of all applications made to the Delivery Body ahead of the relevant Capacity Auction as well as details of those who were successful in obtaining a Capacity Agreement and any enduring obligations.
The Clearing Price and Aggregate volume of Capacity Agreements Awarded for each auction is published on the Capacity Market Portal Knowledge site here
NOTE: From 22 July 2026, all components with a capacity less than 30kW have been aggregated per Generating Technology Class per CMU with additional aggregation for Permitted on-site Generating Units. Components with a capacity of 30 kW or above continue to be reported individually. A new column is added to the end of the Components data file called "Number of Components". This reflects the number of components that have been aggregated.
The existing "Component History" datafile will be renamed to "Component History - Pre Aggregation" on 22nd July 2026, and this file will contain the week-on-week changes at Component level prior to component aggregation on 22 July 2026. No changes are made to this datafile after 22 July 2026.
On 22nd July, a new datafile called "Component History" will be created. This datafile will be populated from 29 July 2026 onwards and this data file details the week-on-week changes at Component level following the aggregation of components less than 30kW.
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8 Data Files
| Name | Format | Last Changed Sort ascending | Download | Explore |
|---|---|---|---|---|
| Component History | CSV | Download (CSV) | view | |
| Capacity Market Unit (CMU) History | CSV | Download (CSV) | view | |
| Components | CSV | Download (CSV) | view | |
| Capacity Market Unit (CMU) | CSV | Download (CSV) | view | |
| Component History - Pre Aggregation | CSV | Download (CSV) | view | |
| Capacity Market Auction Capacity and Cost | CSV | Download (CSV) | view | |
| Capacity Market De-Rating Factors | CSV | Download (CSV) | view | |
| Capacity Market Auction Static Data | CSV | Download (CSV) | view |
Additional Information
| Field | Value |
|---|---|
| Date Created | February 18, 2025 at 4:08 PM (UTC+00:00) |
| Rights | NESO Open Data Licence |
| Update frequency | Weekly |
cURL integration
# Get a list of dataset's resources
curl -L -s https://api.neso.energy/api/3/action/datapackage_show?id=capacity-market-register | grep path
# Get resources
curl -L https://api.neso.energy/dataset/0b3ab475-5622-4465-8825-9d35d03bb28b/resource/62bca39c-d4f0-4cd6-b2ff-8ef42dca7f23/download/component_changes_20260805.csv
curl -L https://api.neso.energy/dataset/0b3ab475-5622-4465-8825-9d35d03bb28b/resource/cd034839-73e7-4c37-b4e5-6ebea25627d8/download/cmu_changes_20260805.csv
curl -L https://api.neso.energy/dataset/0b3ab475-5622-4465-8825-9d35d03bb28b/resource/790f5fa0-f8eb-4d82-b98d-0d34d3e404e8/download/component_20260805.csv
curl -L https://api.neso.energy/dataset/0b3ab475-5622-4465-8825-9d35d03bb28b/resource/25a5fa2e-873d-41c5-8aaf-fbc2b06d79e6/download/cmu_20260805.csv
curl -L https://api.neso.energy/dataset/0b3ab475-5622-4465-8825-9d35d03bb28b/resource/015453e0-c73c-416a-901d-623f914c8e70/download/component_changes_20260715.csv
curl -L https://api.neso.energy/dataset/0b3ab475-5622-4465-8825-9d35d03bb28b/resource/b1b58919-eaa4-40ea-80df-3d3e526f8223/download/capacity-market-auction-capacity-and-cost.csv
curl -L https://api.neso.energy/dataset/0b3ab475-5622-4465-8825-9d35d03bb28b/resource/d94ff98d-39ba-40d6-9672-7433de0631ac/download/capacity-market-de-rating-factors.csv
curl -L https://api.neso.energy/dataset/0b3ab475-5622-4465-8825-9d35d03bb28b/resource/784fa703-1460-42cd-a8bb-fba4dcabac8d/download/capacity-market-auction-static-data.csv