1. Project Nexus Workgroup Unique Sites 4 th November 2014

2. Key Points Unique Sites are currently maintained ‘offline’ to UKLink due to complex processes. Requirement from PN UNC for Unique Sites to be held and maintained on the Supply Point Register (UKLink). All existing Unique Sites will be migrated to UKLink for Go Live All SPA and update processes will be managed via file interface with a few exceptions All transportation charges will be included on the standard invoices. All LDZ Unique Sites will have a Confirmation Reference Number allocated, not an LMN (Logical Meter Number). NTS and LDZ Telemetered sites will continue to be allocated an LMN.

3. Overview of Changes – MPRN Creation For LDZ Supply Meter Points the MPRN will be created as per the existing process for directly connected sites, For NTS Supply Meter Points the MPRN will be created via liaison with National Grid Transmission. All Supply Meter Points will be assigned an MPRN. Currently NTS sites do not have an MPRN but a notional MPRN will be allocated in order that standard file flows can be utilised

4. Nominations will be submitted via the standard SPA file flows except for Shared Supply Meter Points (SSMPs) and Interconnectors (to be covered in a later slide) Nominations will be Referred to the appropriate Network/NGT for the following checks: –Contract i.e. NEXA –MNEPOR (NTS) –NEXA Max SOQ value is not available (CSO) –NTS/ LDZ Optional Commodity requested –Capacity revisions Overview of Changes – Nominations

5. Overview of Changes – Confirmations Confirmations will be submitted via the standard SPA file flows except for Shared Supply Meter Points (SSMPs) and Interconnectors (to be covered in a later slide) Objections will be processed as per SPA file flows For LDZ Supply Meter Points a Confirmation reference will be allocated & notified via SPA file flows For NTS and Telemetered Supply Meter Points an LMN will be allocated & notified via SPA file flows Standard transfer of ownership files will be issued to the Proposing & Outgoing Shipper

6. Overview of Changes – Supply Point Updates With the exception of SSMPs, all updates to the Supply Meter Point will be via the SPA file flows –Capacity requests will be via SPA file flows and will be Referred as required to the relevant Network for approval An AQ will be calculated monthly, subject to a valid read being received, and notifications issued Ratchets (LDZ) and Overruns (NTS) will be calculated as normal and Ratchet notification issued via the Ratchet notification files

7. Overview of Changes – Asset Updates All asset updates will be submitted via RGMA flows except for Supply Meter Points with ‘Special Metering Arrangements’ For Supply Meter Points with Special Metering Arrangements the GT will submit the asset updates which will be notified to the Shipper (via MRI file)

8. Shared Supply Meter Points Shared Supply Meter Points (SSMP) will not be included in standard SPA file flows, due to the complexity in time bound activities. It is proposed that the following activities are managed as part of an authorised email route using standard templates: –Nominations –Offers –Withdrawal –Confirmation –Asset Updates A separate presentation has been provided regarding email communication

9. Shared Supply Meter Points Cont. Supply Point updates may be made via file except where it would result in an amendment to the set-up of the SSMP i.e. capacity revision/change of Shipper, in which case it must be performed via re-nomination and confirmation. Where a withdrawal occurs at an SSMP, Xoserve will notify all other Shippers via email. If as a result the site becomes a single Shipper Supply Meter Point a notification will be issued via SPA files.

10. Interconnectors Interconnectors have different data requirements to other sites, including the recording of specific contractual agreements, and will therefore be managed separately. Interconnectors will be directly confirmed via email in order to provide the contract documentation required for processing.

11. Transition Requirements Confirmation Numbers will be generated, assigned and communicated in advance of Project Nexus implementation. These will replace the LMN’s for LDZ Supply Meter Points. Outstanding Offers and Referrals will be treated as per all other sites and will not be migrated. Transportation charges for the September billing period will be calculated & issued from legacy systems and files