Harmonisation Working Group Retail Market Harmonisation Working Group

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Harmonisation Working Group Retail Market Harmonisation Working Group 6 NIAUR Offices, Belfast 14 December

Harmonisation Working Group Retail Market Harmonisation Working Group 6 NIAUR Offices, Belfast 14 December 2009

Harmonisation Working Group Agenda v Minutes from HWG 3 a/4/5 v Matters Arising &

Harmonisation Working Group Agenda v Minutes from HWG 3 a/4/5 v Matters Arising & Outstanding from previous HWG meetings v Proposal Agreements for Data Processing, Aggregation and Billing v Technical Workstream v Any Other Business v Next Meeting 2 Private and Confidential

Harmonisation Working Group Issues Outstanding from Previous HWG – To Close v Report back

Harmonisation Working Group Issues Outstanding from Previous HWG – To Close v Report back on differences in the check digit algorithm v From samples ESB and NIE have been unable to reproduce a difference v Population of interval timestamps v NIE will harmonise arrangements with ESB wherever timestamps are used within market messages v Register Type Code v ESB and NIE codes have different meanings v E. g. 50/52 refer to k. W; IS/ES refer to k. Wh v Incomplete withdrawn meter reading sets in NI v NIE will modify processing withdraw and replace all readings, even though only some readings are in error v Timing of issue of message 301 N by NIE v NIE propose to generate on quotation issue (as ESB) v Most Suppliers requested this approach 3 Private and Confidential

Harmonisation Working Group Issues Outstanding from Previous HWG – Carried Forward v NIE MPRN

Harmonisation Working Group Issues Outstanding from Previous HWG – Carried Forward v NIE MPRN Website Data Publication Legal Review v. Including NIE updates to medical equipment details v CER Consultation & Co. P on Objection & Debt v De-energisation Co. P review – to detailed design v. Domestic de-energisation for non-payment through NI SIG 12 January v Interval metering installation charges in NI v. This will be addressed through NI SIG v Extension of Co. S customer read window to D-5 (IGG status) v Correct population of MIC start date 4 Private and Confidential

Harmonisation Working Group Proposal Agreement on Data Processing Unmetered Data Processing Data Aggregation DUo.

Harmonisation Working Group Proposal Agreement on Data Processing Unmetered Data Processing Data Aggregation DUo. S Billing

Harmonisation Working Group Proposal Agreement – DP; DA; Billing v We will briefly review

Harmonisation Working Group Proposal Agreement – DP; DA; Billing v We will briefly review v Proposals presented on 1 st December v Proposal changes and clarifications made as a result of comments made– highlighted in red v We will then v Seek general agreement v List exceptions to agreement v Work on the items agreed as outstanding – requiring further work v Refer other exceptions to next HSG (18 th December) for decision v Issue message guides v Issue document summarising procedural changes • NIE and ESB will issue separate documents • There may be no changes and hence no document for ESB 6 Private and Confidential

Harmonisation Working Group Customer and MP Data Summary v What key items have changed

Harmonisation Working Group Customer and MP Data Summary v What key items have changed since HWG 5 v. DUo. S re-estimation consumption thresh-hold in NI amended v. Clarification on how message 252 is used to dispute a Co. S read v. Approach to EUF calculation in NI to match ESB approach v. MPRN counts may not be populated by NIE on aggregation messages v What remains the same v. Messaging v. Items not in red type v What remains outstanding and is excluded from agreement vt. b. a. 7 Private and Confidential

Harmonisation Working Group Data Processing - Messaging v NIE will introduce the following messages

Harmonisation Working Group Data Processing - Messaging v NIE will introduce the following messages v Message 208 Co. S Read Disputes v Message 342 Interval Meter Export v Messages 306 W, 307 W, 310 W, 320 W and 332 W – Withdrawn Reading v Messages 303 R and 305 were already introduced by Enduring Solution v NIE will not introduce the following messages v Message 308 Load Factor Exceptions • NHH MD metering is to be phased out in NI 8 Private and Confidential

Harmonisation Working Group Data Processing – NHH Estimation Method (credit and multi-rate keypad meters)

Harmonisation Working Group Data Processing – NHH Estimation Method (credit and multi-rate keypad meters) v NIE will further refine estimating approach as follows v Use equivalent period of previous year for registers with switched profiles v Use immediate previous period for registers with standard profiles v Profiles 1 and 3 are standard, profiles 2 and 4 are switched v Following provisions continue to apply v Base period must be a minimum length • Minimum to be reviewed, NIE tends to be shorter than ESB v Period length weighting to be applied using profiles v If no period can be found matching criteria NIE will continue to use trend default • Default values in NIE are dynamically maintained by type of installation • ESB uses static default values v Estimating approach proposed above more closely aligns to ESB approach v ESB can optionally use equivalent period of previous year v Approach has been shown to deliver accurate results v EAC / Profile approaches tend to inaccuracy at the individual Meter Point level 9 Private and Confidential

Harmonisation Working Group Data Processing – Estimation Application v To align with Ro. I;

Harmonisation Working Group Data Processing – Estimation Application v To align with Ro. I; NIE will apply the method described on the previous slide in all the following circumstances: v Estimation for DUo. S billing when there is no scheduled read • Excluding single rate keypad metering v Estimation for Change of Supplier; excluding disputes v Estimation when a closing read at meter removal, exchange, replacement or deenergisation cannot be obtained or validated v Estimation to complete a set of readings when there are missing or invalid reads (so that the valid reads can be used) v Estimation for meter read validation v NIE do not currently propose to use the above method to estimate readings v When interpolation is to be used (e. g. Co. S disputes, MCR 0165) v NIE do not estimate in the following circumstances v Change of legal entity (unless Change of Supplier is also occuring) • Co. LE is not settlement or DUo. S relevant v Change of usage (a DUo. S estimate may be re-used) v These areas are not aligned with ESB 10 Private and Confidential

Harmonisation Working Group Data Processing – Meter Read Validation v NIE propose to modify

Harmonisation Working Group Data Processing – Meter Read Validation v NIE propose to modify validation routines as follows v To introduce a deminimus advance below which any advance on an energised meter will be considered valid v This will more closely align with a similar routine in Ro. I v NIE will review high limits above which a meter advance must be manually confirmed v In both NI and Ro. I high limits are based on a multiple of expected consumption estimated as previously described v Currently these limits vary between NIE and ESBN • (for example HHU/HHT limits are tighter in NI than in Ro. I) 11 Private and Confidential

Harmonisation Working Group Data Processing – Estimation Application v Settlement Relevant Estimates v When

Harmonisation Working Group Data Processing – Estimation Application v Settlement Relevant Estimates v When an estimate is settlement relevant usage factors are calculated and communicated using messages 300, 300 S, 306, 307, 310, 320, 332 v Estimates are settlement relevant in NI and Ro. I when they are made: v for Change of Supplier; including disputes v when a closing read at meter removal, exchange, replacement or deenergisation cannot be obtained or validated v to complete a set of readings when there are missing or invalid reads • (so that other valid reads can be used) v for a Change of Usage 12 Private and Confidential

Harmonisation Working Group Data Processing – Usage Factors v Calculation method for AUF (ESB)

Harmonisation Working Group Data Processing – Usage Factors v Calculation method for AUF (ESB) and AAC (NIE) aligns v Calculation method for EUF (ESB) and EAC (NIE) does not align v ESB use weighted average of previous 365 days AUF v Weighting is based on profile coefficients v NIE extrapolate from reading greater 46 weeks old v NIE propose to adopt the same approach as ESB v Weighting will be based on profile coefficients v Suppliers requested a harmonised calculation v Approach allows a future use of smoothing parameters v NIE will retain proposal to set EAC to zero for long term vacant sites as described for the Enduring Solution v When site becomes re-occupied EAC reset and message 300 is sent even if no reading 13 Private and Confidential

Harmonisation Working Group Data Processing – Usage Factors v NIE proposes removal of usage

Harmonisation Working Group Data Processing – Usage Factors v NIE proposes removal of usage factors at register level v UFs will be provided at Meter Point/Timeslot level but not Register level v Working practice will be developed to address issues that may arise • Similar to WP 005 implemented by ESB v No Suppliers required retention of usage factors at register level v However; two issues were raised by Suppliers: to resolve these v Estimated consumption will be provided on message 320 at register level to help in first bill calculation v On message 332 when there is new metering or a new connection with the same timeslot on more than one register • EUF will be provided at timeslot but not register level • Suppliers can divide the Timeslot EUF by the number of registers affected to obtain a register specific EUF • In general NIE should not be fitting these metering configurations in future • NIE cannot commit to holding a register specific EUF 14 Private and Confidential

Harmonisation Working Group Effective Dates Difference on re-energisation in NI enables re-energisation next day

Harmonisation Working Group Effective Dates Difference on re-energisation in NI enables re-energisation next day without a break in usage Design in Ro. I allows a short gap in usage for both next day re-energisation and for meter replacement and re-energisation on the same day

Harmonisation Working Group Effective Dates – Co. S and Co. LE Reads v Change

Harmonisation Working Group Effective Dates – Co. S and Co. LE Reads v Change of Supplier v Reading and Required Date (D) on message 010 v Read Date = Required Date, at D, this is the Move Out Date v New Supplier Move In is D+1, EUF effective from D+1 v Change of Legal Entity v Reading and Required Date (D) on message 016 v Required Date is the Move In Date v Reading is dated at D-1, the Move Out Date v Move In Date is D, EUF effective from D

Harmonisation Working Group Message 210 Supplier Provided Read Schema Serial number mandatory on 210

Harmonisation Working Group Message 210 Supplier Provided Read Schema Serial number mandatory on 210 (and 208) but remains optional on 010 and 016 Message also contains Party Contact Details segment

Harmonisation Working Group Message 303 R Rejection of Supplier Provided Read v Message 303

Harmonisation Working Group Message 303 R Rejection of Supplier Provided Read v Message 303 R is used as a rejection of readings submitted using messages 010, 016 and 210 v Message 303 R is to be issued when v Meter details are incorrect (010, 016 and 210) v Readings are dated prior to the last DUo. S bill (210 only in Ro. I) v Readings are future dated (010 and 210 only in Ro. I) v NIE will also issue message 303 R as follows where ESB do not v When meter reads are implausible v Readings are provided for a Co. LE with no date • ESB will estimate readings in this scenario • NIE do not estimate for Co. LE v Available Meter ID segment contain the actual metering details provided when message 303 R is issued in response: v When the meter details provided were incorrect

Harmonisation Working Group Message 303 R Schema

Harmonisation Working Group Message 303 R Schema

Harmonisation Working Group Message 300 Meter Reading Schema (MPRN, Usage Factor and Remarks) Meter

Harmonisation Working Group Message 300 Meter Reading Schema (MPRN, Usage Factor and Remarks) Meter reader remarks used by NIE for now vacant / now occupied

Harmonisation Working Group Message 300 Meter Reading Schema (Meter and Register)

Harmonisation Working Group Message 300 Meter Reading Schema (Meter and Register)

Harmonisation Working Group Message 300 S Special Read (MPRN, Usage Factor and Remarks) Meter

Harmonisation Working Group Message 300 S Special Read (MPRN, Usage Factor and Remarks) Meter ID and Register Data are the same as for message 300

Harmonisation Working Group Message 305 Estimate Schema Used for non-settlement relevant estimates Therefore does

Harmonisation Working Group Message 305 Estimate Schema Used for non-settlement relevant estimates Therefore does not contain load profile (any profile change would be settlement relevant) Read status code, proposed by NIE in Enduring Solution, is not provided as has only one value

Harmonisation Working Group Message 306 De-Energisation Schema Message 307 Re-Energisation Schema (MPRN and Usage

Harmonisation Working Group Message 306 De-Energisation Schema Message 307 Re-Energisation Schema (MPRN and Usage Factors) Meter ID and Register Data are the same as for message 300

Harmonisation Working Group Message 310 Co. S Closing Read Schema (MPRN and Usage Factors)

Harmonisation Working Group Message 310 Co. S Closing Read Schema (MPRN and Usage Factors) Meter ID and Register Data are the same as for message 300

Harmonisation Working Group Message 320 Co. S Opening Read Schema (MPRN and Usage Factors)

Harmonisation Working Group Message 320 Co. S Opening Read Schema (MPRN and Usage Factors)

Harmonisation Working Group Message 320 Co. S Opening Read Schema (Meter ID and Register

Harmonisation Working Group Message 320 Co. S Opening Read Schema (Meter ID and Register Data ) Estimated consumption provides details for first customer bill. It will be calculated by NIE using the same approach as an EUF

Harmonisation Working Group Message 332 Meter Works Schema (MPRN and Usage Factors) Generally AUF

Harmonisation Working Group Message 332 Meter Works Schema (MPRN and Usage Factors) Generally AUF are not present for a New Connection Generally EUF are not present when all meters are removed

Harmonisation Working Group Message 332 Meter Works Schema (Removed Meters)

Harmonisation Working Group Message 332 Meter Works Schema (Removed Meters)

Harmonisation Working Group Message 332 Meter Works Schema (New Meters)

Harmonisation Working Group Message 332 Meter Works Schema (New Meters)

Harmonisation Working Group Message 332 Meter Works Schema (Retained Meters) Segment will be introduced

Harmonisation Working Group Message 332 Meter Works Schema (Retained Meters) Segment will be introduced into NI schema and used for retained meters Currently NI do not use the retained meter segment

Harmonisation Working Group Message 300 W Withdrawn Reading Schema (MPRN Level)

Harmonisation Working Group Message 300 W Withdrawn Reading Schema (MPRN Level)

Harmonisation Working Group Message 300 W Withdrawn Reading Schema (Meter ID and Register Data

Harmonisation Working Group Message 300 W Withdrawn Reading Schema (Meter ID and Register Data ) Meter ID and Register Data schema are the same as for message 300 This was not previously the case in NI

Harmonisation Working Group Message 306 W Withdrawn De-Energisation Schema Message 307 W Withdrawn Re-Energisation

Harmonisation Working Group Message 306 W Withdrawn De-Energisation Schema Message 307 W Withdrawn Re-Energisation Schema (MPRN Level) Replaces message 300 W in NI Read date will no longer be available in NI Meter ID and Register Data are the same as for message 300 W

Harmonisation Working Group Message 310 W Withdrawn Co. S Read Schema (MPRN Level) Replaces

Harmonisation Working Group Message 310 W Withdrawn Co. S Read Schema (MPRN Level) Replaces message 300 W in NI Meter ID and Register Data are the same as for message 300 W

Harmonisation Working Group Message 320 W Withdrawn Co. S Read Schema (MPRN Level) Replaces

Harmonisation Working Group Message 320 W Withdrawn Co. S Read Schema (MPRN Level) Replaces message 300 W in NI

Harmonisation Working Group Message 320 W Withdrawn Co. S Read Schema (Meter and Register

Harmonisation Working Group Message 320 W Withdrawn Co. S Read Schema (Meter and Register Level) Replaces message 300 W in NI

Harmonisation Working Group Message 332 W Withdrawn Meter Works Schema (MPRN Level) Replaces message

Harmonisation Working Group Message 332 W Withdrawn Meter Works Schema (MPRN Level) Replaces message 300 W in NI Read date will no longer be available in NI Removed, new and retained meter segments follow the same format as 332 Usage factors will be removed from ESB message 332 W (they are not used)

Harmonisation Working Group Co. S Reading Dispute v NIE to introduce message 208 to

Harmonisation Working Group Co. S Reading Dispute v NIE to introduce message 208 to enable a Supplier to submit a replacement reading to settle a Co. S dispute v Only one Supplier is required to submit the 208 message v NIE MRS will contact the other Supplier to obtain agreement v Assuming agreement responses are: • 310 W and 310 to Old Supplier and 320 W and 320 to New Supplier v NIE to introduce a usage of message 252 to resolve a Co. S reading dispute v Read type E is used with reason code 04 to request estimate from an actual read v NIE MRS will contact the other Supplier to obtain agreement to use of an estimate v If NIE hold an actual read collected after the Co. S, that read is used v If NIE do not hold an actual read collected after the Co. S, a special read is obtained v Estimates are created by interpolation from the special read or actual read v The special read may be chargeable if the original Co. S read is upheld v The special read is sent to the registered Supplier using message 300 S. v Responses containing the interpolated estimated Co. S read are as per 208 v Proposals match ESB processing and will be reflected in AP 102 a v NB: In general where an actual read is less than an estimated or Supplier provided customer reading used for a Change of Supplier, the Change of Supplier reading will be reversed and replaced

Harmonisation Working Group Message 208 Replacement Reading Schema Serial number mandatory on 208 (and

Harmonisation Working Group Message 208 Replacement Reading Schema Serial number mandatory on 208 (and 210) but remains optional on 010 and 016 Message also contains Party Contact Details segment

Harmonisation Working Group Message 331 Interval Meter – ex Meter Works & Co. S

Harmonisation Working Group Message 331 Interval Meter – ex Meter Works & Co. S

Harmonisation Working Group Message 341 Interval Import Schema Alert Flag replaces Channel Status in

Harmonisation Working Group Message 341 Interval Import Schema Alert Flag replaces Channel Status in NI (channel status had valid and invalid status codes) Both NIE and ESB accumulate data from multiple outstations into one record

Harmonisation Working Group Message 342 Interval Export Schema Both NIE and ESB accumulate data

Harmonisation Working Group Message 342 Interval Export Schema Both NIE and ESB accumulate data from multiple outstations into one record This message is sent to Suppliers nominated to receive data of distribution connected (NPE) Participant Generators and those registered in a Non Participant Export Arrangement

Harmonisation Working Group Unmetered Supplies v NIE will introduce the following messages v Message

Harmonisation Working Group Unmetered Supplies v NIE will introduce the following messages v Message 701 Unmetered Consumption • Will be used by NIE as a result of Billing including Co. S Loss v Messages 700 W and 701 W – Withdrawn Inventory/Consumption v Messages 700 was already introduced by Enduring Solution v Will be further used to communicate changes after energisations/deenergisations have occurred v Unmetered processes will remain unchanged in NIE for v Annual confirmation v Inventory update v Inventory splits v Inventory clarifications v Message 700 was introduced for use under the enduring solution for these processes 44 Private and Confidential

Harmonisation Working Group Unmetered Supplies - Data v Decisions on consumption determination remain open

Harmonisation Working Group Unmetered Supplies - Data v Decisions on consumption determination remain open v ESB use Burning Hours Calendar v NIE may use Burning Hours or Profile depending on Procured System v Methods are Equivalent v NIE will not populate Group MPRN v Group MPRN is optional field v NIE does not group unmetered MPRNs v Technical MPRN will always be populated • This MPRN should also be used on registration messaging v Meter Point Address is populated with Billing Address in NI 45 Private and Confidential

Harmonisation Working Group Use of 700 series messages v Message 700 Inventory v New

Harmonisation Working Group Use of 700 series messages v Message 700 Inventory v New unmetered connection v Change of inventory • including energisation or de-energisation of all or part of the inventory v Change of Supplier - Gain v Message 701 Consumption v Monthly billing v Change of Legal Entity v Change of Supplier – Loss – to Old Supplier v Message 700 W Inventory Withdrawal v Reversal across a change of inventory v Reversal across a Change of Supplier – Gain v Message 701 W Consumption (Billing) Withdrawal v Billing reversal across monthly billing v Billing reversal across a Change of Legal Entity v Billing reversal across a Change of Supplier - Loss - to Old Supplier 46 Private and Confidential

Harmonisation Working Group Message 700 Unmetered Inventory Schema Unmetered Type Code has been changed

Harmonisation Working Group Message 700 Unmetered Inventory Schema Unmetered Type Code has been changed to eight characters Message also contains Meter Point Address segment

Harmonisation Working Group Message 701 Unmetered Consumption Schema Consumption at MPRN level is the

Harmonisation Working Group Message 701 Unmetered Consumption Schema Consumption at MPRN level is the sum of consumptions at detail level Unmetered Type Code has been changed to eight character

Harmonisation Working Group Message 700 W Withdrawn Inventory Schema Unmetered Type Code has been

Harmonisation Working Group Message 700 W Withdrawn Inventory Schema Unmetered Type Code has been changed to eight characters Message also contains Meter Point Address segment

Harmonisation Working Group Message 701 W Withdrawn Consumption Schema Unmetered Type Code has been

Harmonisation Working Group Message 701 W Withdrawn Consumption Schema Unmetered Type Code has been changed to eight character

Harmonisation Working Group Data Aggregation - Messaging v NIE will provide Suppliers with the

Harmonisation Working Group Data Aggregation - Messaging v NIE will provide Suppliers with the 59 x series of aggregation messages v Messages 591, 595, 596 and 598 to Suppliers • Messages 591, 595 and 598 contain gross import / export • Message 596 will include import net of non-participant export v Messages 594 and 597 to Participant Generators • or to Suppliers nominated to receive messages on their behalf v All responding Suppliers operating in the Ro. I market required consistency between Ro. I and NI and require messaging in order to: v Reconcile settlement v Reconcile purchases from generators v Transact business with deminimus generators v At least one Supplier preferred retention of NIE secure server files v A potential design solution is to: v Retain the current aggregation processes to generate secure server files v Use the secure server files as an input to generating market messages v 51 Consequently NIE also proposes to retain the secure server files Private and Confidential

Harmonisation Working Group Message 591 Non Interval Aggregation (by SU) MPRN Tally will not

Harmonisation Working Group Message 591 Non Interval Aggregation (by SU) MPRN Tally will not be used by NIE, subject to detailed design

Harmonisation Working Group Message 595 Interval Aggregation (by SU) Percentage of MPRN estimated is

Harmonisation Working Group Message 595 Interval Aggregation (by SU) Percentage of MPRN estimated is now optional to be used by ESB only. MPRN Tally will not be used by NIE, subject to detailed design

Harmonisation Working Group Message 598 Non Participant GU Aggregation It is also confirmed that

Harmonisation Working Group Message 598 Non Participant GU Aggregation It is also confirmed that Message 594 (Participant GU Aggregation) has the same structure as message 598 Messages can be provided to an associated Supplier

Harmonisation Working Group Message 596 Supply Copy SMO SU Aggregation

Harmonisation Working Group Message 596 Supply Copy SMO SU Aggregation

Harmonisation Working Group Message 597 Generator Copy SMO GU Aggregation Can be provided to

Harmonisation Working Group Message 597 Generator Copy SMO GU Aggregation Can be provided to an associated Supplier

Harmonisation Working Group Data Aggregation - Other v NIE to provide EAC/AAC effective date

Harmonisation Working Group Data Aggregation - Other v NIE to provide EAC/AAC effective date on aggregation audit trail 57 Private and Confidential

Harmonisation Working Group DUo. S Billing v The following processes remain unchanged in both

Harmonisation Working Group DUo. S Billing v The following processes remain unchanged in both jurisdictions: v Tariff determination v Billing and invoicing cycles v NIE will not be introducing messages 507 or 507 C v Message 507 C relates to designated disputes v Thresshold for designated disputes in NI is 5% of entire bill v Highly unlikely many disputes will reach this level v Disputes continue to be handled manually v Message 507 adds little value as a reconciliation if message 507 C is not used 58 Private and Confidential

Harmonisation Working Group MCR 0165 v MCR 0165 was approved in Ro. I for

Harmonisation Working Group MCR 0165 v MCR 0165 was approved in Ro. I for adjustments to estimated bills v NIE will align with the general intent of MCR 0165 as follows v Will apply when: • The AUF calculated for a timeslot from a set of meter readings exceeds twice the value of the previous EUF for the timeslot – This accounts for profiling and the longer read cycle in NI • Two or more consecutive quarterly bills have been estimated – ESB use a rule of three bi-monthly bills • No actual readings or settlement relevant estimates have been billed in the last six months v In the above circumstances NIE will • Cancel and rebill all DUo. S estimates since the last billed actual read • Interpolate estimates on the basis of the current actual read • Use message 305 to communicate re-estimates 59 Private and Confidential

Harmonisation Working Group DUo. S Billing – Cancel and Re. Bill v NIE cancel

Harmonisation Working Group DUo. S Billing – Cancel and Re. Bill v NIE cancel and rebill scenarios will be broadly consistent with ESB v Examples of where cancel and rebilling occurs are: v Valid actual read less than previous estimate • (including Supplier provided reads) v Co. S readings are agreed to be replaced v Meter readings are found to be incorrect v Wrong Supplier is billed (e. g. Co. S cancelled) v Late capture of fieldwork completions completed before last DUo. S bill v MCR 0165 scenario previous described 60 Private and Confidential

Harmonisation Working Group DUo. S Billing v Previously communicated changes to be implemented by

Harmonisation Working Group DUo. S Billing v Previously communicated changes to be implemented by NIE are: v Proposed as part of Enduring Solution • Continuous Billing • NIE to move to time-slicing approach when tariff changes occur – This is the current ESB approach v Change of usage to be handled as agreed at HWG 5 v Charges following a request to de-energise to be handled as agreed in HWG 3 a and 4 v Estimation approach for billing NHH credit metering described earlier v Use of message 305 when DUo. S consumption is re-estimated and is not settlement relevant v No further changes are proposed 61 Private and Confidential

Harmonisation Working Group Agreements and Exceptions v Supplier exceptions to proposals for changes to

Harmonisation Working Group Agreements and Exceptions v Supplier exceptions to proposals for changes to NI processes 62 Private and Confidential

Harmonisation Working Group Technical Workgroup Issues v Discussions ongoing regarding the following issues: v

Harmonisation Working Group Technical Workgroup Issues v Discussions ongoing regarding the following issues: v Alternative Supplier ID • Currently used for Supplier IDs under which electricity is traded through SEM and meters points are registered, but for which a physical EMMA does not exist • Not used for suppliers who do not register meter points and trade through SEM • Meter points where energy is retailed through third party (e. g. supermarket) that does not trade through SEM, must be registered under the Supplier ID that trades through SEM v Technical / receipt acknowledgments v Message reconciliation (message 602) v Character sets v Approach to validating / rejecting jurisdiction specific data codes used in other jurisdiction 63 Private and Confidential

Harmonisation Working Group Any Other Business v Messages and data fields renamed to be

Harmonisation Working Group Any Other Business v Messages and data fields renamed to be independent of interval length v Baseline to include v Message Schema - substantively complete • single common document v Data Codes - now agreed between ESB and NIE • single common document v Data Definition Catalogue • single common document v Message Guides – in progress • initially separate for each jurisdiction v Agreed Changes Document (for Market Procedures) • separate for each jurisdiction 64 Private and Confidential

Harmonisation Working Group Next Meetings v To be announced 65 Private and Confidential

Harmonisation Working Group Next Meetings v To be announced 65 Private and Confidential