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Guidance Notes

CONTENTS

Elexon Monitoring of Incorrect Non Half Hourly (NHH) Energisation Status

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Elexon Monitoring of Incorrect Non Half Hourly (NHH) Energisation Status

Guidance Note

What is the Issue?

Metering System Energisation Status is used by Non-Half Hourly Data Aggregators (NHHDAs) to determine whether consumption for a Metering System is included in data aggregation. If the Energisation Status in the Supplier Meter Registration Service (SMRS) does not match the actual physical status, this can result in a Settlement error. Settlement Risk SR0026 relates to incorrect Energisation Status. This document gives an overview of the issue and outlines how we monitor it.

How does incorrect Energisation Status impact Settlement?

Where a Metering System is energised in SMRS, any consumption Estimated Annual Consumption (EAC) or Annualised Advance (AA) will be used in Settlement. However, the rules are more complex when it comes to De-energised Metering Systems. Settlement aims to omit consumption for De-Energised Metering Systems from data aggregation. This is done using logic. Where a Metering System is De-energised in SMRS but an AA exists in NHHDA, the AA will be used in Settlement. The reasoning is that if an AA exists, it is based on an actual Meter Reading and is therefore correct. The Metering System can be considered to be logically Energised. Where a Metering System is De-energised in SMRS but only an Estimated Annual Consumption (EAC) exists in NHHDA, the EAC will not be used in Settlement. The Metering System can be considered to be logically De-energised. The table below shows the different potential scenarios and the inferred logical Energisation Status.

Physical Energisation Status

Energisation Status according to SMRS

Consumption in NHHDA

Logical Energisation Status

Settlement

Error?

D

D

EAC

D

NO

E

D

EAC

D

YES

D

D

AA

E

YES

E

D

AA

E

NO

D

E

EAC/AA

E

YES

E

E

EAC/AA

E

NO

Errors arise in Settlement where the logical Energisation Status of a Metering System does not match its physical Energisation Status. The error can be in two forms:

    • either a Metering System is logically Energised in Settlement but physically De- energised resulting in an overstatement of energy in Supplier Volume Allocation; or

    • a Metering System is logically De-energised in Settlement but physically Energised resulting in an understatement of energy in Supplier Volume Allocation.

Only errors resulting in an understatement of Supply Volume Allocation are monitored by the Performance Assurance Board (PAB).

What do Elexon do?

We monitor the issue of incorrect energisation status and report information to the industry. This includes instance reporting to Suppliers identifying potential Settlement errors. We also provide Material Error Monitoring to the PAB. This highlights the Suppliers which are underperforming at the issue. We carry out monitoring on a quarterly basis, and the Elexon Monitoring of Incorrect NHH Energisation Status Timetable is published on the BSC Website.

Supplier Instance Reports

Instance Reports are produced for each Supplier Id. The reports identify Metering Systems within NHHDA databases which are at risk of having an incorrect Energisation Status. Instance reporting is carried out for data at R3. This identifies potential errors to Suppliers ahead of RF so that they can be corrected.

It is not possible, based solely on the data within NHHDA, to determine whether a Metering System has an incorrect Energisation Status. However, it is possible to identify specific scenarios for which this is a high risk. These “at risk pots” are used to monitor the issue. There are nine “at risk pots” in total, each of which is determined by a particular scenario in NHHDA. They are:

1. Non Zero AA (NZAA)

2. Zero AA (ZAA)

3. Non Zero EAC (NZEAC)

4. Zero EAC (ZEAC)

5. Long Term De-energised (LTD)

6. SMRS De-energised & DC Null (DC Null)

7. Long Term De-energised & DC Null (LTD DC Null)

8. SMRS Energised & DC Null (E DC Null)

9. Other

Instance Reports include all Metering Systems in NHHDA that fit into these nine “at risk pots”. Appendix 1 illustrates at a high level the different NHHDA scenarios that compile each “at risk pot”. Appendix 2 defines the specific criteria used to assign Metering Systems to the different pots.

Material Error Monitoring and Incorrect Energisation Status

Material Error Monitoring is a detective technique under the Performance Assurance Framework. It is used to estimate the impact of a Settlement error, monitor error levels over time, and estimate contributions made by individual Party's and their Agents. We carry out material error monitoring for incorrect Energisation Status and report the results to the PAB. This information is also included in Materiality Reports to Suppliers.

Similarly to the Instance Reports above, the data used for material error monitoring is extracted from NHHDA. However, the aim with material error monitoring is to obtain a view of the error that exists at RF. It therefore uses data extracted for an RF Settlement Date.

Material error monitoring is done for just four of the nine “at risk pots”. The monitored pots are for scenarios resulting in an underestimate of Supplier Volume Allocation and benefit the Suppliers responsible for the error. Any Metering Systems in these pots which were physically energised on the RF date in question, have resulted in energy incorrectly omitted from Settlement.

The monitored pots are:

    • Non Zero EAC (NZEAC)

    • Long Term De-energised (LTD)

    • SMRS De-energised & DC Null (DC Null)

    • Long Term De-energised & DC Null (LTD DC Null)

To estimate the size of this error we ask Suppliers to analyse a sample from each of their four monitored pots. This gives us an estimate of the proportion of instances which were physically energised and causing an error. We apply the proportions to the relevant pot counts to estimate the total number of Metering Systems in error. Finally to establish a material error value we apply an average annual consumption figure to the error counts. This gives us an estimate of the material error associated with the issue and the contribution of each Supplier Id.

How should I carry out Supplier Sampling?

If you are a Supplier, you will receive a sample of instances within each of the four “at risk pots” used for material error monitoring. The sample size depends on the total number of instances within each pot. As a Supplier you should investigate each Metering System on the list to determine its physical Energisation status, either Energised or De-energised.

As a Supplier you should have a good view as to the physical energisation status at the site on the RF date in question. Evidence to determine this may be available from your billing & data flow management system. Key indicators are:

    • Is the customer electricity account being billed? If so are the bills being paid?

    • Is any consumption being recorded against the account?

    • Have you received any instructions or notifications that confirm the energisation status, e.g. data flow from the Meter Operator?

    • Is there any additional information on the customer in the Supplier’s records? This could be from communications with the customer, or additional information from a duel fuel account.

If a comparison to the billing system is not possible, the data should be compared to the Supplier's own registration system.

Once Energisation status has been assessed this should be indicated by putting a “D” for de- energised or an “E” for energised in the appropriate column of the Sample Spreadsheet. A comment can also be included but this is not mandatory. The results should be returned to Elexon.

Appendix 1: “At Risk Pot” Descriptions

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Appendix 2: "At Risk Pot" Detail

Category ID 1. Non Zero AA (NZAA)

SMRS ES Status

NHHDC ES Status

Analysis Description

Analysis

Id

D

D

AA > 10 kWh

25

D

D

AA < -10 kWh

26

D

E

AA > 10 kWh

45

D

E

AA < -10 kWh

46

D

Null

AA from a previous DC

101

Category ID 2. Zero AA (ZAA)

SMRS ES Status

NHHDC ES Status

Analysis Description

Analysis

Id

D

D

AA = 0 kWh

21

D

D

-10 kWh < AA < 10 kWh

22

D

E

AA = 0 kWh

41

D

E

-10 kWh < AA < 10 kWh

42

Category ID 3. Non Zero EAC (NZEAC)

SMRS ES Status

NHHDC ES Status

Analysis Description

Analysis

Id

D

D

No AA, EAC > 10 kWh

27

D

D

No AA, EAC < -10 kWh

28

D

D

No Consumption from DC

31

D

E

No AA, EAC > 10 kWh

47

D

E

No AA, EAC < -10 kWh

48

D

E

No Consumption from DC

51

Category ID 4. Zero EAC (ZEAC)

SMRS ES Status

NHHDC ES Status

Analysis Description

Analysis

Id

D

D

No AA, EAC = 0 kWh

23

D

D

No AA, -10 kWh < EAC < 10 kWh

24

D

E

No AA, EAC = 0 kWh

43

D

E

No AA, -10 kWh < EAC < 10 kWh

44

D

Null

Low or Zero EAC from previous DC

102

Category I Category ID 5. Long Term De-energised (LTD)

SMRS ES Status

NHHDC ES Status

Analysis Description

Analysis

Id

D

D

De-energised in SMRS before 31/12/1998, No AA, EAC missing or EAC effective from date before 31/12/1998

30

D

E

De-energised in SMRS before 31/12/1998, No AA, EAC missing or EAC effective from date before 31/12/1998

50

Category ID 6. SMRS De-energised & DC Null (DCNull)

SMRS ES Status

NHHDC ES Status

Analysis Description

Analysis

Id

D

Null

De-energised in SMRS after 01/01/1999, DC Energisation status is Null

80

Category ID 7. Long Term De-energised & DC Null (LTD_DCNull)

SMRS ES Status

NHHDC ES Status

Analysis Description

Analysis

Id

D

Null

De-energised in SMRS before 31/12/1998, DC Energisation status is Null

90

Category ID 8. SMRS Energised & DC Null (EDCNull)

SMRS ES Status

NHHDC ES Status

Analysis Description

Analysis

Id

E

Null

DC Energisation status is Null

100

Category ID 9. Other

SMRS ES Status

NHHDC ES Status

Analysis Description

Analysis

Id

Not in any other group

0

E

D

AA = 0 kWh

61

E

D

-10 < AA < 10 kWh

62

E

D

EAC = 0 kWh

63

E

D

-10 kWh < EAC < 10 kWh

64

E

D

AA > 10 kWh

65

E

D

AA < -10 kWh

66

E

D

EAC > 10 kWh

67

E

D

EAC < -10 kWh

68

E

D

De-energised in SMRS before 31/12/1998,

No AA, EAC missing or EAC effective from date before 31/12/1998

70

E

D

No Consumption from DC

71

Need more information?

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

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No representation, warranty or guarantee is made that the information in this document is accurate or complete. While care is taken in the collection and provision of this information, Elexon Limited shall not be liable for any errors, omissions, misstatements or mistakes in any information or damages resulting from the use of this information or action taken in reliance on it.