Material Error Monitoring


Material 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

For more information see below:

Erroneous Large EAC/AAs

You can view our video on EAC/AA on the new Training Videos page of our website.

Erroneous Large EAC/AA Annual Billed Unit Guidance
Issued On: 7-November-2013

Erroneous Large EAC/AA Reporting Timetable 2015
Issued On: 04-December-2013

Management and Resolution of Large EAC/AAs
Issued On: 27-February-2014

NHH Meter Reading Validation Algorithm [305 Kb]
Issued On: 7-November-2013

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

ELEXON Monitoring of Incorrect NHH Energisation Status [290 Kb]
Issued On: 07-November-2013

Energisation Status Monitoring Calendar 2015-2016
Issued On: 11-February-2015

UMS Monitoring Timetable 2015-2016
Issued On: 30-March-2015

UMS Monitoring Timetable 2014-2015
Issued On: 31-March-2014

Unmetered Supplies Monitoring Guidance [156 Kb]
Issued On: 7-November-2013

Performance Assurance Framework

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