Skip Rate - In Merit All Balancing Mechanism - March 2025

"All Balancing Mechanism Skip Rate" (BM skip) – A measure of avoidable skips, taking into consideration all balancing mechanism actions we could have taken over the relevant period.

We endeavour to publish these datasets by 17:00 on business working days.

15/05/2025: We have reissued all published datasets to correct inconsistencies caused by treatment of marginal units and where accepted volume > feasible available volume. Further information about this can be found in the slides & recordings from the Skip Rate Forum on 1st May on the skip rate page of our website.

18/11/2025: We have reissued all published datasets to correct a bug that affected the exclusion of long notice units. This is to ensure consistency of published metrics, and doesn't effect a change of the skip rates methodology.

CKAN Data API

Access resource data via a web API with powerful query support.
Further information in the main CKAN Data API and DataStore documentation.

The Data API can be accessed via the following actions of the CKAN action API.

Query
`https://api.neso.energy/api/3/action/datastore_search`
Query (via SQL)
`https://api.neso.energy/api/3/action/datastore_search_sql`

Query example (first 5 results)
`https://api.neso.energy/api/3/action/datastore_search?resource_id=19dcbf5b-2868-4cce-aeb4-068d42bc17d2&limit=5`
Query example (via SQL statement)
`https://api.neso.energy/api/3/action/datastore_search_sql?sql=SELECT * from "19dcbf5b-2868-4cce-aeb4-068d42bc17d2" LIMIT 5`

A simple ajax (JSONP) request to the data API using jQuery.

var data = {
  resource_id: '19dcbf5b-2868-4cce-aeb4-068d42bc17d2', // the resource id
  limit: 5 // get 5 results
};
$.ajax({
  url: 'https://api.neso.energy/api/3/action/datastore_search',
  data: data,
  dataType: 'jsonp',
  success: function(data) {
    alert('Total results found: ' + data.result.total)
  }
});

A simple ajax (JSONP) request to the data API using jQuery.

import urllib2
  url = 'https://api.neso.energy/api/3/action/datastore_search?resource_id=19dcbf5b-2868-4cce-aeb4-068d42bc17d2&limit=5'
  fileobj = urllib2.urlopen(url)
  print fileobj.read()

Download (CSV)

Data Explorer

Table Information

date

Title	Date
Type	datetime
Description	Datetime slice at 5min intervals
Comment
Example	2024-10-11T23:55:00Z
Unit	DateTime UTC

bm_unit

Title	BM Unit
Type	string
Description	BMU ID in merit stack
Comment
Example	CONTB-1
Unit

fuel

Title	Fuel
Type	string
Description	Fuel type of BMU
Comment
Example	Battery
Unit

bid_offer

Title	Bid/Offer
Type	string
Description	Whether the volume and price refers to a bid or an offer
Comment
Example	Offer
Unit

stage

Title	Stage
Type	integer
Description	Identify which units are still in merit after each stage in skip rate methodology
Comment
Example	5
Unit

available_volume_MWh

Title	Available Volume MWh
Type	number
Description	Total available volume
Comment
Example	100
Unit	MWh

average_price_per_MWh

Title	Average Price £/MWh
Type	number
Description	Average price for accepted volume
Comment
Example	100
Unit	£/MWh

pair_id

Title	Pair Id
Type	string
Description	A number used to identify a particular Bid-Offer Pair. Values are negative for Bid-Offer Pairs that cover operating levels below Final Physical Notification (FPN) and positive for those that cover operating levels above FPN.
Comment
Example	1
Unit

accepted_volume_MWh

Title	Accepted Volume MWh
Type	number
Description	Total accepted volume
Comment
Example	50
Unit	MWh

in_merit_volume_MWh

Title	In Merit Volume MWh
Type	number
Description	Total imbalance volume that was in-merit
Comment
Example	50
Unit	MWh

skipped_volume_MWh

Title	Skipped Volume MWh
Type	number
Description	The volume that was skipped
Comment
Example	10
Unit	MWh

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Skip Rate - In Merit All Balancing Mechanism - March 2025

CKAN Data API

Data Explorer

Data Explorer

Table Information

date

bm_unit

fuel

bid_offer

stage

available_volume_MWh

average_price_per_MWh

pair_id

accepted_volume_MWh

in_merit_volume_MWh

skipped_volume_MWh