Meter Read Validation11th August 2014

Background

• The meter read validation principles were developed under ‘The Settlement’ BRD and formed part of Modification 0432.

• The new read validations and tolerances are documented in the ‘Uniform Network Code Validation Rules’

• Concerns have been raised that the read validation tolerances may not be appropriate, particularly for Smaller Supply Points

• British Gas delivered a presentation at the 31st January 2014 Project Nexus meeting highlighting some issues with the current proposed tolerances

• Further analysis was carried out by British Gas and by Xoserve• The following slides provides proposals for changes to the

tolerances

Summary of the Issues Identified

• The tolerances for SSPs in Class 4 will not allow for a read that produces a zero consumption to be accepted without the ‘Override Flag’

• Market Breaker Tolerances for all Classes for larger Supply Meter Points appears too high, particularly for DM Supply Meter Points

• Where the AQ has reduced over a period of time due to low consumption and the Supply Meter Point starts consuming again, the current tolerances may prevent a read from being loaded– Scenario generally applies to SSP’s that are ‘vacant’

• High consumptions due to the ‘Through the Zero’ count not being populated on the read file

Financial Values for Class 2 & 3

Daily Read Sites (Class 2 & 3) Calculated consumption compared to SOQ for each day

Large sites within Band, Standard EUC  

AQ Band EUCs

Absolute Lower

limit

Lower override

limit

Upper Override

limit

Absolute Upper Limit Example AQ

Typical Load

Factor

Typical SOQ (non

WAR Band)

Min daily consumption - with override

flag kWh

Min daily consumption -

without override flag kWh

Max daily consumption -

without override flag kWh

Max daily consumption - with override

flag kWh

Daily Max Energy Value -

without flag

Daily Max Energy Value -

with override flag

Monthly Max Energy Value

0-73,200 1 0% 0% 73200 kWh 700% 70,000 30.0 639   0 - 73200 kWh 4,475 £ 1,464.00 £ 89.50 £ 2,685

73,201-732,000 2-3 0% 10% 100% 650% 700,000 27.0 7,103   0 710 7,103 46,169 £ 142.06 £ 923.38 £ 27,701

732,000-2,196,000 4 0% 10% 100% 600% 2,000,000 33.0 16,604   0 1,660 16,604 99,626 £ 332 £ 1,993 £ 59,776

2,196,000-29,300,000 5-7 0% 10% 100% 550% 29,000,000 42.0 189,172   0 18,917 189,172 1,040,444 £ 3,783 £ 20,809 £ 624,266

29,300,000-58,600,000 8 0% 10% 100% 500% 58,000,000 55.0 288,917   0 28,892 288,917 1,444,583 £ 5,778 £ 28,892 £ 866,750

>58,600,000 9 0% 10% 100% 450% 100,000,000 67.0 408,914   0 40,891 408,914 1,840,114 £ 8,178 £ 36,802 £ 1,104,068

The figures in the following slides are indicative only, based on the latest version of the UNC Related document, and use estimated values for Load Factors (to calculate SOQs) and SAP prices. It is designed to illustrate the largest values which might be expected to pass within the market breaker upper tolerance test, however actual outcomes may differ in practice.

Financial Values for Class 4

Non Daily Read Sites (Class 4) Calculated consumption compared to AQ/365 per day Large sites within Band (EUC is irrelevant)

AQ Band EUCs

Absolute Lower

limit

Lower override

limit

Upper Override

limit

Absolute Upper Limit Example AQ AQ/365

Min daily consumption - with override

flag kWh

Min daily consumption -

without override flag kWh

Max daily consumption -

without override flag kWh

Max daily consumption - with override

flag kWh

Daily Max Energy Value -

without flag

Daily Max Energy Value -

with override flag

Monthly Max Energy Value

0-73,200 1 0% 20% 300% 700% 70,000 192 0 38 575 1,342 £ 12 £ 27 £ 805

73,201-732,000 2-3 0% 20% 250% 650% 700,000 1,918 0 384 4,795 12,466 £ 96 £ 249 £ 7,480

732,000-2,196,000 4 0% 20% 200% 600% 2,000,000 5,479 0 1,096 10,959 32,877 £ 219 £ 658 £ 19,726

2,196,000-29,300,000 5-7 0% 20% 150% 550% 29,000,000 79,452 0 15,890 119,178 436,986 £ 2,384 £ 8,740 £ 262,192

29,300,000-58,600,000 8 0% 20% 100% 500% 58,000,000 158,904 0 31,781 158,904 794,521 £ 3,178 £ 15,890 £ 476,713

>58,600,000 9 0% 20% 100% 450% 100,000,000 273,973 0 54,795 273,973 1,232,877 £ 5,479 £ 24,658 £ 739,726

The figures in the following slides are indicative only, based on the latest version of the UNC Related document, and use estimated values for Load Factors (to calculate SOQs) and SAP prices. It is designed to illustrate the largest values which might be expected to pass within the market breaker upper tolerance test, however actual outcomes may differ in practice.

Xoserve Recommendations

• For all Classes and all Supply Points allow zero consumption reads to be submitted without the need of the Override Flag

• Lower the Market Breaker upper tolerances, especially for Class 2 as currently allows a daily read to be accepted that is 7 x the SOQ

• For Class 4 SSPs have a Override Read Tolerance high enough to allow reads in following period of very low or zero consumption

• Make the ‘Through the Zero’ (TTZ) count mandatory on all read files

Tolerances for Daily Reads Documented in the Settlement BRD

Lower AQ band (kWh)

Upper AQ band (kWh)

Tolerances where read will be accepted Read Accepted if

submitted with an Override Flag

‘Market Breaker’ Read Rejected

0 73,200 0 - 73,200 kWh 0 – 699% of SOQ < 0% or > 700% of SOQ

73,201 732,000 10% - 100% of SOQ0 - 9% or 101% - 649% of

SOQ< 0% or > 650% of SOQ

732,001 2,196,000 10% - 100% of SOQ0 - 9% or 101% - 599% of

SOQ< 0% or > 600% of SOQ

2,196,001 29,300,000 10% - 100% of SOQ0 - 9% or 101% - 549% of

SOQ< 0% or > 550% of SOQ

29,300,001 58,600,000 10% - 100% of SOQ0 - 9% or 101% - 499% of

SOQ< 0% or > 500% of SOQ

58,600,001 and above 10% - 100% of SOQ0 - 9% or 101% - 449% of

SOQ< 0% or > 450% of SOQ

Tolerances for a daily read received following an actual read

Proposed Tolerances for Daily Reads (Classes 1, 2 & 3)

Lower AQ band (kWh)

Upper AQ band (kWh)

Tolerances where read will be

accepted

Read Accepted if submitted with an

Override Flag

‘Market Breaker’ Read Rejected

0 73,200 0% - 130% of SOQ 131% - 299% of SOQ > 300% of SOQ

73,201 732,000 0% - 130% of SOQ 131% - 299% of SOQ > 300% of SOQ

732,001 2,196,000 0% - 130% of SOQ 131% - 249% of SOQ > 250% of SOQ

2,196,001 29,300,000 0% - 130% of SOQ 131% - 249% of SOQ > 250% of SOQ

29,300,001 58,600,000 0% - 130% of SOQ 131% - 199% of SOQ > 200% of SOQ

58,600,001 and above 0% - 130% of SOQ 131% - 199% of SOQ > 200% of SOQ

Tolerances for a daily read received following an actual read

Tolerances for Periodic Read (Class 4) Documented in the Settlement BRD

Lower AQ band (kWh)

Upper AQ band (kWh)

Tolerances where read will be accepted

Read Accepted if submitted with an Override Flag

‘Market Breaker’ Read Rejected

0 73,20010% - 300% of AQ/365 x

no. of days0 - 19% or 301% - 699% of

AQ/365 x no. of days0 – 700% of AQ/365 x no. of

days

73,201 732,00010% - 250% of AQ/365 x

no. of days0 - 19% or 251% - 649% of

AQ/365 x no. of days0 - 650% of AQ/365 x no. of

days

732,001 2,196,00010% - 200% of AQ/365 x

no. of days0 - 19% or 201% - 599% of

AQ/365 x no. of days0 - 600% of AQ/365 x no. of

days

2,196,001 29,300,00010% - 150% of AQ/365 x

no. of days0 - 19% or 151% - 549% of

AQ/365 x no. of days0 - 550% of AQ/365 x no. of

days

29,300,001 58,600,00010% - 100% of AQ/365 x

no. of days0 - 19% or 101% - 499% of

AQ/365 x no. of days0 - 500% of AQ/365 x no. of

days

58,600,001 and above10% - 100% of AQ/365 x

no. of days0 - 19% or 101% - 449% of

AQ/365 x no. of days0 - 450% of AQ/365 x no. of

days

Tolerances for a periodic read received following an actual read

Proposed Tolerances for a Periodic Read (Class 4)

Lower AQ band (kWh)

Upper AQ band (kWh)

Tolerances where read will be accepted

Read Accepted if submitted with an Override Flag

‘Market Breaker’ Read Rejected

0 73,2000% - 300% of AQ/365 x

no. of days301% - 599% of AQ/365 x no.

of days0 – 600% of AQ/365 x no. of

days

73,201 732,0000% - 250% of AQ/365 x

no. of days251% - 549% of AQ/365 x no.

of days0 - 550% of AQ/365 x no. of

days

732,001 2,196,0000% - 200% of AQ/365 x

no. of days201% - 499% of AQ/365 x no.

of days0 - 500% of AQ/365 x no. of

days

2,196,001 29,300,0000% - 150% of AQ/365 x

no. of days151% - 449% of AQ/365 x no.

of days0 - 450% of AQ/365 x no. of

days

29,300,001 58,600,0000% - 100% of AQ/365 x

no. of days101% - 399% of AQ/365 x no.

of days0 - 400% of AQ/365 x no. of

days

58,600,001 and above0% - 100% of AQ/365 x

no. of days101% - 349% of AQ/365 x no.

of days0 - 350% of AQ/365 x no. of

days

Tolerances for a periodic read received following an actual read

Next Steps

• Shippers to check the proposed tolerances on a sample of Meter Points

• At the September meeting review the tolerances and results of Shipper analysis

• Update tolerances where required• Update Settlement BRD• Update UNC Validation Rules and submit for

approval