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CONTENTS

Unmetered Supplies Monitoring Explanatory Notes

v 5.0
Effective From Date:
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Unmetered Supplies (UMS) Monitoring

Guidance Note

Explanatory Notes

Elexon monitors the issue of erroneous values of Unmetered Supplies in the Non Half Hourly (NHH) market. The monitoring involves comparing UMS data from Unmetered Supplies Operators (UMSOs) and Non Half Hourly Data Aggregators (NHHDAs) on a particular Settlement Date following the SF run. The monitoring takes place quarterly and the dates used can be found in the UMS Monitoring Timetable.

On or shortly after the Settlement Date all UMSOs provide Elexon with an extract of NHH UMS EAC values, similar to those provided to Supplier in the P0218 report as defined in the SVA Data Catalogue.

Following the SF run for the Settlement Date all NHHDAs run a script provided by Elexon that results in a csv file for each partition containing information on all UMS MPANs. The UMSO and NHHDA data is then processed and compared by Elexon to determine the error in Settlement.

The instances identified as contributing to the error as reported in the Supplier Materiality Reports fall into one of three categories:

DA Only

These are MPANs that are only held in NHHDA and are not in the UMSO data. This category includes only:

    • MPANs energised according to SMRS view (unless an AA has been submitted – in this case the AA is replaced by a Default EAC and included in the error in line with aggregation rules)

    • MPANs with Measurement Class B (NHH Unmetered) according to SMRS view

    • Instances where the error > 5MWh (as agreed with BSC Auditor)

If the NHHDA holds an MPAN but no EAC value a Default EAC is inserted by the monitoring system in line with aggregation rules.

UMS Only

These are MPANs that are held in UMSO and do not appear in the NHHDA data. This category includes only:

    • MPANs energised according to the UMSO

    • MPANs with MC B according to the UMSO

    • Instances where the error > 5MWh (as agreed with BSC Auditor)

Both

These are MPANs that appear in both the NHHDA and the UMSO data but either the EAC values or the Energisation Status (ES) held is different. This category includes only:

    • MPANs with MC B according to UMSO

    • Instances where the error > 5MWh (as agreed with BSC Auditor)

Where either the NHHDA or UMSO holds the MPAN as de-energised the EAC value is taken to be zero in the error calculation (unless the NHHDA holds an AA – in this case the AA is replaced by a Default EAC in line with aggregation rules). Where the NHHDA holds the MPAN but no EAC value a Default EAC is inserted. For the purposes of calculating the Settlement error each MPAN contributes it is assumed that the UMSO view of the ES and MC is accurate.

Supplier Reports

The Supplier reports are distributed by Supplier ID. They include all instances contributing to the error that are attributed to that Supplier ID. As well as the instances where the error is greater than 5MWh, they also show instances below 5MWh on separate worksheets. Only the instances above 5MWh contribute to the error reported in the Supplier Materiality Reports, the other instances are reported to give a complete view to the Supplier of all discrepancies to help with resolution. The reports contain sheets with the following columns:

Totals

DA_Count

Number of MPANs in DA Only

UMS_Count

Number of MPANs in UMS Only

Both_Count

Number of MAPNs in Both

Total_Count

Total number of MPANs in all error categories

DA_Error

Sum of the error of all instances in DA Only [MWh]

UMS_Error

Sum of the error of all instances in UMS Only [MWh]

Both_Error

Sum of the error of all instances in Both [MWh]

Total_Error

Sum of the error of all instances across all categories [MWh]

DA_Only (above and below 5MWh)

MPAN

MPAN

NHHDA

NHHDA ID

SUP

Supplier ID

DC_ID

NHHDC ID

E_or_A

Whether the NHHDA holds and EAC or AA. If the NHHDA does not hold either this column will be empty

ES

Energisation Status held by the NHHDA

EAC

This will either be the EAC value as submitted by the NHHDA or a Default EAC value inserted by the monitoring system if the E_or_A column is empty or is A [kWh]

EFSD

Effective From Settlement Date of the EAC

MWh_Error

The error contribution for that MPAN. This will equal the EAC value but will be reported in MWh

UMS Only (above and below 5MWh)

MPAN

MPAN

UMSO

UMSO ID

SUP

Supplier ID

ES

Energisation Status held by the UMSO (if this was missing from the original extract it will be assumed energised and will be shown as ‘E (assumed)’ in this column)

EAC

The EAC value as submitted by the UMSO [kWh]

EAC_eff_date

Effective From Settlement Date of the UMSO EAC

MWh_Error

The error contribution for that MPAN. This will be equal to the negative of the EAC value (as it is negative error) but will be reported in MWh rather than KWh.

Both (above and below 5MWh)

MPAN

MPAN

NHHDA

NHHDA ID

UMSO

UMSO ID

SUP

Supplier ID

DC_ID

NHHDC ID

E_or_A

Whether the NHHDA holds and EAC or AA. If the NHHDA does not hold either this column will be empty

DA_ES

Energisation Status held by the NHHDA

DA_EAC

This will either be the EAC value as submitted by the NHHDA or a Default EAC value inserted by the monitoring system if the E_or_A column is empty or is A. If the MPAN is de-energised according to SMRS the EAC value submitted will be shown here but a value of zero will be used to calculate the error. [kWh]

DA_EAC_EFSD

Effective From Settlement Date of the NHHDA EAC

UMSO_ES

Energisation Status held by the UMSO (if this was missing from the original extract it will be assumed energised and will be shown as ‘E (assumed)’ in this column)

UMSO_EAC

The EAC value as submitted by the UMSO. If the MPAN is de-energised according to the UMSO the EAC value submitted will still be shown here but a value of zero will be used to calculate the error. [kWh]

UMSO_EAC_EFSD

Effective From Settlement Date of the UMSO EAC

MWh_Error

The error contribution for that MPAN. This is the difference between the EACs (unless either the UMSO or NHHDA hold the MPAN as de-energised in which case it will be the value of the EAC that is not held as de-energised). [MWh]

UMSO Reports

The UMSO reports contain the same sheets as the Supplier reports apart from the ‘DA Only’. They include all instances contributing to the error that are attributed to that UMSO ID.

Need more information?

For more information please contact the BSC Service Desk or call 0370 010 6950.

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