Capacity Market Unit (CMU) History

This datafile contains list of weekly changes to the Capacity Market Unit (CMU) History dataset by type and date.

NOTE: The following resource will begin receiving updates starting January 21st onwards.

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Table Information

Auction Name

Title Auction Name
Type string
Description Name of Capacity Market Auction
Comment
Example Capacity Market Register 2027-28 (T-4)
Unit

Application ID

Title Application ID
Type string
Description System generated ID for Application
Comment ID is a combination of application type, delivery year and CMU ID
Example A-T-4-2028-CMU123-00001
Unit

CMU ID

Title CMU ID
Type string
Description ID of Capacity Market Unit - defined by Capacity Provider
Comment 6 characters alpha numeric
Example 18EG18
Unit

Type

Title Type
Type string
Description Indicates the number of years leading up to the delivery year
Comment Either T-1, T-3, T-4 or ST (Secondary Trade)
Example T-1
Unit

Delivery Year

Title Delivery Year
Type integer
Description First Delivery Year to which the Capacity Auction Relates to
Comment
Example 2024
Unit Year

Attribute

Title Attribute
Type string
Description The name of the column in CMU dataset where the value has changed
Comment
Example Name of Applicant
Unit

Previous

Title Previous Value
Type string
Description The attribute value in the previously published CMR
Comment
Example Example Company A
Unit

Latest

Title Latest Value
Type string
Description The updated attribute value, as at the change date
Comment
Example Example Company B
Unit

Change Type

Title Change Type
Type string
Description Type of change to value, new, removed or update
Comment New/Removed/Update
Example Update
Unit

Change Date

Title Change Date
Type date
Description The date that the change was first reported on CMR (normally Wednesday)
Comment
Example 2025-06-29
Unit