Material Error Monitoring


GMaterial Error Monitoring is designed to: Estimate the impact and materiality of a Settlement Error; Monitor error levels over time; and Estimate the contribution to overall market errors made by individual Parties and their Agents. The process also helps us rank customer performance in the market and identify operational issues.

Why is it used?

Material Error Monitoring provides assurance to Panel committees and other market participants that a Performance Assurance Party’s contribution to the error is quantified and the impact of such errors is established. This technique complements the BSC Audit, Technical Assurance, Error and Failure Resolution and Trading Disputes processes.

The PAB has a set of reporting requirements used to monitor materiality.

How does the process work?

We use the Material Error Monitoring process to analyse settlement data and supplementary data to estimate and track identified material errors. We can model and communicate the impact of identified settlement errors to the Performance Assurance Board and/or Trading Disputes Committee to help them make decisions. It also enables us to provide estimated error contribution to customers confidentially so they can monitor their progress in resolving errors.

What are the big issues at the moment?

Issues we’re currently monitoring include:

  • Erroneous Large Estimated Annual Consumption (EAC)/Annualised Advances (AAs);
  • Unmetered Supplies (UMS); and
  • Incorrect Energisation Status.
  • Additional Information

Erroneous Large EAC/AAs

Discover full details of Erroneous Large EAC/AAs and how the process works by reading the relevant guidance note

Related information

2021 Erroneously Large EAC AA Reporting Calendar

2020 Erroneously Large EAC AA Reporting Calendar

Erroneous Large EAC/AAs Management and Resolution

Work shop notes: 22 September 2011 [182 Kb]
Issued On: 24-November-2011

Large EAC/AA Forum Minutes – March 2012

Large EAC/AA Forum Minutes – April 2013

Incorrect NHH Energisation Status & Unmetered Supplies

Monitoring of Incorrect Non Half Hourly (NHH) Energisation Status

Energisation Status Monitoring Calendar 2020-2021

Issued On: 12-October-2020

UMS Monitoring Timetable 2021 – 2022
Issued On: 30-March-2021

Unmetered Supplies Monitoring Explanatory Notes

Performance Assurance Framework

Material Error Monitoring is a detective technique in Elexon’s Performance Assurance Framework.



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