BSC Operations Headline Reports

The report provides commentary on BSC market operation, identifying key events and reporting on important data that may impact BSC Parties. It is produced on a monthly basis and covers the data from the two previous months and is based on a combination of latest and best available data.

Latest report

Content list

  • Feature on Flagged Bids from Wind in January
  • Feature on CAP Breach on 4 February
  • Feature on P359 and Generation/Demand Capacity Breaches
  • Regular article on Trading Charges in November
  • Regular article on Balancing Mechanism volumes in November
  • Regular article on System Prices in December

Feature articles

Flagged Bids from Wind in January

There were 47GWh of flagged Bid Actions taken on the 27 January 2019; 73% of this volume was attributed to Wind BMUs.

Wind flagged actions accounted for 139GWh (20%) of total flagged Bid volume in January, with 69GWh (70%) of this flagged volume occurring on 3 days (12, 13 and 27 January 2019). Conversely, there were 16 days where flagged Wind Bid volume was zero.

Wind Flagged Bid Actions in January 2019

Wind Flagged Bid Actions in January 2019
Wind Flagged Bid Actions in January 2019

On 27 January 2019, the average initial price of all flagged actions was -£51.60/MWh. Of the 2,718 Accepted Wind Bids, 2,273 (84%) were System Operator (SO) or Continuous Acceptance Duration Limit (CADL) flagged.

Flagged Balancing Actions are marked for potential repricing downwards.

CAP Breach on 4 February

The Credit Assessment Price (CAP) is reviewed when the absolute difference between the CAP and the reference price is greater than the current trigger levels. The CAP is currently £68/MWh, with trigger levels of +/-£6/MWh.

The Credit Assessment Price (CAP) reference price breached the lower trigger limit of £62/MWh on 4 February 2019.

Reference Price and CAP

Reference Price and CAP
Reference Price and CAP

ELEXON have published interactive CAP graphs to allow customers to explore this data.

ELEXON issued a consultation on 4 February, suggesting a new CAP value of £56/MWh. If there are no responses to the industry consultation, this new CAP value will be implemented on 6 March 2019.

When there is a change to the CAP, Parties may notice a change in their Credit Cover Percentage, and should review their lodged Credit Cover.

P359 and Generation/Demand Capacity Breaches

GC/DC values are submitted each BSC season. During a BSC Season, BSC Parties with BMUs that breach their declared Generation or Demand Capacity (GC/DC) values beyond the BSC permitted tolerances (see table) are contacted by ELEXON.

Parties are requested to make a mid-season re-declaration with new GC/DC values for any BMUs that have breached.

The graph is based on data from the Trading Operations Report (TOR), and shows GC and DC breaches using SF run data.

Breach Thresholds

Breach Thresholds
Breach Thresholds

For BMUs with a capacity of below 100MW, 146 out of 1,087 BMUs breached either their declared GC or DC. At the other end of the scale, the single BMU in the greater than 500MW capacity has also breached it’s permitted DC value.

Frequent breaches indicate a Party needs to re-declare a higher GC/DC value. Currently, this requires ELEXON to contact the BSC Party responsible for the breach and requesting they manually re-declare their GC/DC values.

From the 28 February 2019, BSC Modification P359 will automate the re-declaration of GC/DC values. This will improve the accuracy of GC and DC re-declarations, and remove the need for BSC Parties to have to manually re-declare.

Number of BMUs Breaching GC/DC

Number of BMUs Breaching GC/DC
Number of BMUs Breaching GC/DC

Currently the majority of breaches occur where BMUs have a capacity of below 100MW, especially where the BSC Party has declared GC/DC values of 0MW for their BMUs.

See P359 ‘Mechanised Process for GC/DC Declarations’ webpage for more information on the upcoming modification.

 

Full list of reports

The BSC Operations Headline Report is produced on a monthly basis for the BSC Panel meetings, and is circulated to the Imbalance Settlement Group (ISG) as well as being published on the ELEXON website.

Please note that the reporting months are the two prior to the current month, based on a combination of latest and best available data.

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