Joint Office of Gas Transporters http://www.gasgovernance.com/Code/Modifications/

UNC Modification Register *Key Dates are normally an end-date, where shown red this is date sent to Ofgem Modification Reference Suffix: A - Alternate, S - Self Governance, FT - Fast Track Self Governance, V - Varied

Mod Proposing Date Live/ Text Text Modification Title Category Workgroup Current Status Next Stage Key date* Legal Text Provider Text Requested Text Due Std Met ACS Ref Organisation Raised Closed Rotation Delivered

Amendment to Gas Quality NTS Entry SAGE North Sea Allocated to 0780 S Specification at the St Fergus SAGE System 11-Aug-21 Live Self-Governance Transmission Report to Panel 16-Dec-21 National Grid Limited Workgroup Entry Point

Allocated to 0779 Introduction of Entry Capacity Assignments National Grid NTS 10-Aug-21 Live Modification Transmission Report to Panel 17-Feb-22 N/A - National Grid Workgroup

Allocated to 0778 R Gas Vacant Sites Process review 09-Aug-21 Live Request Distribution Report to Panel 18-Aug-22 N/A - Request Workgroup

Pavilion Energy Allocated to 0777 Removal of Obstacles to Market Withdrawal 09-Aug-21 Live Modification Transmission Report to Panel 18-Nov-21 National Grid Spain Workgroup

Revision of the Modification Panel Meeting Allocated to 0776 S National Grid NTS 09-Jul-21 Live Self-Governance Governance Report to Panel 21-Oct-21 N/A - National Grid Location Requirement in the Modification Rules Workgroup

Amendment to the Requirement to Conduct the Allocated to 0775 S National Grid NTS 05-Jul-21 Live Self-Governance Transmission Report to Panel 16-Sep-21 N/A - National Grid Transporting Britain’s Energy Consultation Workgroup

Alignment of UNC TPD to the National Grid Representations 0774 S National Grid NTS 05-Jul-21 Live Self-Governance Governance Consultation end 03-Sep-21 N/A - National Grid 19/08/2021 10/09/2021 19/08/2021 Y Licence in respect of the NTS invited

Introduction of a Micro Business identifier in 0773 Gazprom Energy 05-Jul-21 Closed Modification Distribution Withdrawn End of process 12-Jul-21 Cadent 2 Central Systems

Transparency Improvements to the Process for Allocated to 0772 S Changing Gas Quality Limits in NTS National Grid NTS 09-Jun-21 Live Self-Governance Transmission Report to Panel 16-Sep-21 N/A - National Grid n/a Workgroup Connection Agreements

Removal of the absolute requirement to include Allocated to 0771 S a Remotely Operable Valve (ROV) Installation National Grid NTS 08-Jun-21 Live Self-Governance Transmission Report to Panel 21-Oct-21 N/A - National Grid n/a Workgroup for all new NTS Entry connections

Amendments to legal text numbering for UNC Northern Gas 0770 FT 04-Jun-21 Closed Fast Track None Implemented Effective date 09-Jul-21 Northern Gas Networks Modification 0701 Networks

Adding Local Authorities as a new User type to Representations No Text req'd - 0769 S Cadent 01-Jun-21 Live Self-Governance Distribution Consultation end 13-Sep-21 Cadent n/a the Data Permissions Matrix invited enabling Mod

SCR - text Retail Code Consolidation Significant Code Significant Code 0768 Ofgem 13-May-21 Closed Other Implemented Effective date 01-Sep-21 Cadent provided with Review Review mod

Incorporation of AUGE Framework Document Allocated to 0767 Gazprom Energy 12-May-21 Live Modification Distribution Report to Panel 18-Nov-21 Scotia Gas Networks 1 into the UNC main body Workgroup

Align TPD Section Y (Part A-I) to the National 0766 FT National Grid NTS 07-Apr-21 Closed Fast Track NTS CMF Implemented Effective date 11-May-21 N/A - National Grid Grid Licence in respect of the NTS

New retrospective debit and credit charges to reflect changes to the treatment of Entry Representations 0765 National Grid NTS 07-Apr-21 Live Modification NTS CMF Consultation end 20-Sep-21 N/A - National Grid 19/08/2021 10/09/2021 19/08/2021 Y Capacity Revenue between October and invited December 2020

UNC TPD Section Y (Part A-I) amendments to 0764 National Grid NTS 06-Apr-21 Closed Urgent NTS CMF Implemented Effective date 24-May-21 N/A - National Grid Kt to align to RIIO2 Licence

Allocated to 0763 R Review of Gas Meter By-Pass Arrangements 29-Mar-21 Live Request Distribution Report to Panel 21-Oct-21 N/A - Request n/a Workgroup

Adding the Retail Energy Code Company as a 0762 S SGN 12-Mar-21 Closed Self-Governance Distribution Implemented Effective date 12-Jul-21 Scotia Gas Networks n/a new User type to the Data Permissions Matrix

Arrangements for Interconnectors with Allocated to 0761 National Grid NTS 10-Mar-21 Live Modification Transmission Report to Panel 21-Oct-21 N/A - National Grid n/a additional Storage capability Workgroup

© all rights reserved Page 1 of 19 Printed 06/09/2021 15:09 Joint Office of Gas Transporters http://www.gasgovernance.com/Code/Modifications/

UNC Modification Register *Key Dates are normally an end-date, where shown red this is date sent to Ofgem Modification Reference Suffix: A - Alternate, S - Self Governance, FT - Fast Track Self Governance, V - Varied

Mod Proposing Date Live/ Text Text Modification Title Category Workgroup Current Status Next Stage Key date* Legal Text Provider Text Requested Text Due Std Met ACS Ref Organisation Raised Closed Rotation Delivered

Introducing the concept of a derogation Northern Gas Representations 0760 09-Mar-21 Live Modification Governance Consultation end 20-Sep-21 Northern Gas Networks n/a 19/08/2021 10/09/2021 18/08/2021 Y framework into Uniform Network Code (UNC) Networks invited

Enhancements to NTS Within-Day Firm Entry 0759 S National Grid NTS 08-Mar-21 Closed Self-Governance Transmission Implemented Effective date TBC N/A - National Grid n/a 15/04/2021 07/05/2021 and Exit Capacity Allocations

Temporary extension of AUG Statement Utilita Energy 0758 04-Mar-21 Closed Modification Distribution Rejected End of process 06-Sep-21 Cadent 8 15/04/2021 07/05/2021 creation process Limited

Amendment to Ratchet Process Guidance 0757 FT SGN 12-Feb-21 Closed Fast Track None Implemented Effective date 11-May-21 Scotia Gas Networks n/a Document Name

Changes to Offtake Profile Notice Submission Panel requested 0756 S National Grid NTS 11-Feb-21 Closed Self-Governance Transmission Implemented Effective date 14-Jun-21 N/A - National Grid n/a 12/04/2021 01/04/2021 Y Requirements text 18/03/21

Panel requested 0755 S Enhancement of Exit Capacity Assignments National Grid NTS 08-Feb-21 Closed Self-Governance Transmission Implemented Effective date TBC N/A - National Grid n/a text 21/05/21

Investigate Advanced Analytic Options to Allocated to 0754 R Gazprom Energy 05-Feb-21 Live Request Other Report to Panel 18-Nov-21 N/A - Request n/a improve NDM Demand Modelling Workgroup

Removal of Pricing Disincentives for Secondary Panel did not Total Gas and Panel requested 0753 Trading of Fixed Price NTS System Entry 29-Jan-21 Live Modification NTS CMF recommend Ofgem decision 17-Jun-21 N/A - National Grid n/a 12/04/2021 12/02/2021 Y Power text 18/03/21 Capacity implementation

South Hook Gas Panel requested 0752 S Introduction of Weekly Entry Capacity Auction 11-Jan-21 Closed Self-Governance Transmission Implemented Effective date TBC N/A - National Grid n/a 12/04/2021 15/04/2021 Company Ltd text 18/03/21

Panel did not Panel requested 0751 Capping price increases for Long-Term Entry Storengy UK Ltd 11-Jan-21 Live Modification NTS CMF recommend Ofgem decision 17-Jun-21 N/A - National Grid n/a 12/04/2021 13/04/2021 text 18/03/21 Capacity implementation

FT - text Amendment to regulations relating to Covid Northern Gas 0750 FT 14-Dec-20 Closed Fast Track None Implemented Effective date 13-Jan-21 Northern Gas Networks n/a provided with Modifications Networks mod

Allocated to 0749 R Increased DM SOQ Flexibility Barrow Shipping Ltd 11-Dec-20 Live Request Other Report to Panel 21-Oct-21 N/A - Request n/a Workgroup

Prospective Removal of Entry Capacity 0748 Revenue from Capacity Neutrality National Grid NTS 08-Dec-20 Closed Urgent NTS CMF Implemented Effective date 01-Jan-21 N/A - National Grid n/a Arrangements

Amendment of reference from AIGT to INA 0747 FT GTC Pipelines Ltd 03-Dec-20 Closed Fast Track None Implemented Effective date 13-Jan-21 Wales & West Utilities 7 within the UNC

Application of Clarificatory change Panel did not Panel requested 0746 to the AQ amendment process Gazprom Energy 19-Nov-20 Live Modification Distribution recommend Ofgem decision 15-Jul-21 Cadent text 21/05/21 within TPD G2.3 from 1st April 2020 implementation

Panel requested 0745 S Mandatory Setting of Auction Bid Parameters National Grid NTS 12-Nov-20 Closed Self-Governance Transmission Implemented Effective date tbc N/A - National Grid n/a 11/02/2021 text 21/01/21

Remove redundant reference to NTS Optional 0744 FT National Grid NTS 06-Nov-20 Closed Fast Track None Implemented Effective date 11-Dec-20 N/A - National Grid n/a Commodity Charges

Panel requested 0743 S Revisions to User Termination Provisions National Grid NTS 06-Nov-20 Closed Self-Governance Transmission Implemented Effective date 12-Mar-21 N/A - National Grid n/a 11/02/2021 text 21/01/21

Amendment to Gas Quality NTS Entry SAGE North Sea 0742 Specification at the St Fergus SAGE System 06-Nov-20 Closed Modification Transmission Withdrawn End of process 19-Feb-21 N/A - National Grid n/a Limited Entry Point

Updating specific gender references to neutral 0741 S E.ON UK 23-Oct-20 Closed Self-Governance Governance Implemented Effective date 14-Jun-21 Cadent 6 18/02/2021 11/03/2021 09/02/2021 Y terms

© all rights reserved Page 2 of 19 Printed 06/09/2021 15:09 Joint Office of Gas Transporters http://www.gasgovernance.com/Code/Modifications/

UNC Modification Register *Key Dates are normally an end-date, where shown red this is date sent to Ofgem Modification Reference Suffix: A - Alternate, S - Self Governance, FT - Fast Track Self Governance, V - Varied

Mod Proposing Date Live/ Text Text Modification Title Category Workgroup Current Status Next Stage Key date* Legal Text Provider Text Requested Text Due Std Met ACS Ref Organisation Raised Closed Rotation Delivered

0740 - Amending the Formula Year AQ 0740 E.ON UK 09-Oct-20 Closed Modification none Withdrawn End of process 14-Oct-20 approach for 2021/2 Formula Year

Aggregate overrun regime for Original Capacity Panel requested 0739 ENI 05-Oct-20 Closed Modification Transmission Rejected End of process 20-Aug-21 N/A - National Grid n/a 12/01/2021 04/01/2021 held at the Bacton ASEPs text 17/12/20

Panel requested 0738 Incremental NTS Entry Capacity Surrender Barrow Shipping Ltd 05-Oct-20 Closed Modification Transmission Rejected End of process 19-Mar-21 N/A - National Grid n/a Text 19/11/2020

Panel did not Transfer of NTS Entry Capacity from a Panel requested 0737 Centrica 09-Sep-20 Live Modification NTS CMF recommend Ofgem decision 21-Jan-21 N/A - National Grid n/a Capacity Abandoned ASEP Text 19/11/2020 implementation

Clarificatory change to the AQ amendment 0736 A process within TPD G2.3 (Renumbered as Gazprom Energy 15-Sep-20 Closed Modification Distribution Withdrawn End of process 19-Nov-20 Cadent n/a 0746)

Panel Clarificatory change to the AQ amendment 0736 S Cadent 07-Sep-20 Closed Self-Governance Distribution Implemented Effective date 14-Jan-21 Cadent n/a Requested Text 05/11/2020 process within TPD G2.3 15/10/2020

UNC Changes as a consequence of the United 0735 VS National Grid NTS 21-Jan-21 Closed Self-Governance None Implemented Effective date 12-Mar-21 N/A - National Grid Kingdom’s exit from the European Union

UNC Changes as a consequence of the Distribution absence of trade agreement/s between the 0735 S National Grid NTS 04-Sep-20 Closed Self-Governance and Withdrawn End of process 21-Jan-21 N/A - National Grid n/a and the European Union (‘no Transmission deal’)

Reporting Valid Confirmed Theft of Gas into Allocated to 0734 S Central Systems and Reporting Suspected Gazprom Energy 12-Aug-20 Live Self-Governance Distribution Report to Panel 18-Nov-21 Scotia Gas Networks 5 Workgroup Theft to Suppliers

FT - text UNC Section Y clarification post decision on 0733 FT National Grid NTS 10-Aug-20 Closed Fast Track None Implemented Effective date 01-Oct-20 N/A - National Grid n/a provided with implementation of Modification 0678A mod

FT - text Performance Assurance Committee voting Wales & West 0732 FT 07-Aug-20 Closed Fast Track None Implemented Effective date 14-Sep-20 Wales & West Utilites n/a provided with arrangements Utilities mod

Panel Introduction of an Annual Modification Panel 0731 S Gazprom Energy 06-Aug-20 Closed Self-Governance Governance Implemented Effective date 13-Jan-21 Cadent 4 Requested Text 05/11/2020 Report 15/10/2020

0730 V COVID-19 Capacity Retention Process Gazprom Energy 17-Dec-20 Closed Modification Distribution Rejected End of process 19-Mar-21 Northern Gas Networks 3

0730 COVID-19 Capacity Retention Process Gazprom Energy 30-Jun-20 Closed Modification Distribution Withdrawn End of process 17-Dec-20 Northern Gas Networks 02/07/2020

Panel Applying a discount to the Revenue Recovery 0729 Storengy UK Ltd 24-Jun-20 Closed Modification NTS CMF Implemented Effective date 01-Oct-21 National Grid NTS n/a Requested Text 19/08/2020 19/08/2020 Y Charge at Storage Points 19/08/2020

Introduction of Conditional Discounts for 0728 D ENI 09-Jun-20 Closed Urgent NTS CMF Rejected End of process 27-Apr-21 National Grid NTS n/a Avoiding Inefficient Bypass of the NTS

Introduction of a Capacity Discount to Avoid 0728 C RWE 09-Jun-20 Closed Urgent NTS CMF Rejected End of process 27-Apr-21 National Grid NTS n/a Inefficient Bypass of the NTS

Introduction of Conditional Discount for 0728 B Avoiding Inefficient Bypass of the NTS with Vitol SA Geneva 09-Jun-20 Closed Urgent NTS CMF Implemented Effective date 01-Oct-21 National Grid NTS n/a 28km distance cap

Introduction of Conditional Discounts for South Hook Gas 0728 A 09-Jun-20 Closed Urgent NTS CMF Rejected End of process 27-Apr-21 National Grid NTS n/a Avoiding Inefficient Bypass of the NTS Company Ltd

Introduction of a Conditional Discount for 0728 National Grid NTS 09-Jun-20 Closed Urgent NTS CMF Rejected End of process 27-Apr-21 National Grid NTS n/a Avoiding Inefficient Bypass of the NTS

© all rights reserved Page 3 of 19 Printed 06/09/2021 15:09 Joint Office of Gas Transporters http://www.gasgovernance.com/Code/Modifications/

UNC Modification Register *Key Dates are normally an end-date, where shown red this is date sent to Ofgem Modification Reference Suffix: A - Alternate, S - Self Governance, FT - Fast Track Self Governance, V - Varied

Mod Proposing Date Live/ Text Text Modification Title Category Workgroup Current Status Next Stage Key date* Legal Text Provider Text Requested Text Due Std Met ACS Ref Organisation Raised Closed Rotation Delivered

Increasing the Storage Transmission Capacity 0727 Storengy UK 05-Jun-20 Closed Urgent NTS CMF Implemented Effective date 01-Oct-21 National Grid NTS n/a Charge Discount to 80%

Wales & West 0726 COVID-19 Liquidity Relief Scheme for Shippers 03-Jun-20 Closed Urgent Distribution Implemented Effective date 24-Jun-20 Northern Gas Networks n/a Utilities

Ability to Reflect the Correct Customer Network 0725 Use and System Offtake Quantity (SOQ) Gazprom Energy 05-May-20 Closed Urgent Other Rejected End of process 29-May-20 Northern Gas Networks n/a During COVID-19

Amendment to Ratchet charges during COVID- Northern Gas 0724 21-Apr-20 Closed Urgent Distribution Implemented Effective date 12-May-20 Northern Gas Networks n/a 19 period Networks

Use of the Isolation Flag to identify sites with Northern Gas 0723 abnormal load reduction during COVID-19 21-Apr-20 Closed Urgent Distribution Implemented Effective date 12-May-20 Northern Gas Networks n/a Networks period

Allow Users to submit Estimated Meter 0722 Gazprom Energy 21-Apr-20 Closed Urgent Distribution Implemented Effective date 12-May-20 Northern Gas Networks n/a Reading during COVID-19

Shipper submitted AQ Corrections during 0721 Gazprom Energy 21-Apr-20 Closed Urgent Distribution Rejected End of process 02-Jun-20 Northern Gas Networks n/a COVID-19

Amendments to the Agreed Target Quantity at N/A - Enabling 0720 S National Grid 11-Mar-20 Closed Self-Governance Transmission Implemented Effective date 09-Oct-20 n/a the Moffat Interconnection Point Modification

0719 R Calculation of Energy Value of Gas SGN 06-Mar-20 Closed Request Offtake Request Closed End of process 17-Sep-20 National Grid NTS n/a

Introduction of Conditional Capacity Discount 0718 C RWE 06-Mar-20 Closed Modification NTS CMF Withdrawn End of process 26-Mar-20 National Grid NTS n/a for Avoiding Inefficient Bypass of the NTS

Introduction of Conditional Discounts for VPI Immingham 0718 B Avoiding Inefficient Bypass of the NTS with 06-Mar-20 Closed Modification NTS CMF Withdrawn End of process 26-Mar-20 National Grid NTS n/a LLP 28km Distance Cap

Introduction of Conditional Discounts for 0718 A South Hook Gas 06-Mar-20 Closed Modification NTS CMF Withdrawn End of process 26-Mar-20 National Grid NTS n/a Avoiding Inefficient Bypass of the NTS

Introduction of a Conditional Discount for 0718 National Grid 06-Mar-20 Closed Modification NTS CMF Withdrawn End of process 26-Mar-20 National Grid NTS n/a Avoiding Inefficient Bypass of the NTS

Increasing the Storage Transmission Capacity 0717 Storengy UK 05-Mar-20 Closed Modification NTS CMF Withdrawn End of process 26-Mar-20 na na Charge Discount to 80%

Panel 0716 A Revision of Overrun Charge Multiplier Storengy UK 20-Apr-20 Closed Modification Transmission Rejected End of process 18-Sep-20 N/A - National Grid n/a Requested Text 09/07/2020 19/06/2020

Panel 0716 Revision of Overrun Charge Multiplier National Grid 12-Feb-20 Closed Modification Transmission Implemented Effective date 01-Oct-20 N/A - National Grid n/a Requested Text 09/07/2020 19/06/2020

Amendment of the Data Permission Matrix and 0715 S UNC TPD Section V5 to add Electricity System National Grid 10-Feb-20 Closed Self-Governance Distribution Implemented Effective date 15-Jun-20 n/a n/a Operator (ESO) as a new User type

Amendment to Network Entry Provision at 0714 Centrica 08-Jan-20 Closed Modification Other Implemented Effective date 29-Mar-21 n/a n/a Bacton terminal

Panel Amendments to TPD V3.1.7 Independent Wales & West Transmission 0713 S 12-Dec-19 Closed Self-Governance Implemented Effective date 11-May-20 Wales & West Utilities n/a Requested Text 14/01/2020 Assessment table Utilities & Distribution 19/12/2019

Amending the oxygen content limit in the OMV Gas Marketing 0712 S Network Entry Agreement (NEA) at the St 20-Nov-19 Closed Self-Governance Transmission Implemented Effective date 11-May-20 n/a and Trading GmbH Fergus SAGE plant

© all rights reserved Page 4 of 19 Printed 06/09/2021 15:09 Joint Office of Gas Transporters http://www.gasgovernance.com/Code/Modifications/

UNC Modification Register *Key Dates are normally an end-date, where shown red this is date sent to Ofgem Modification Reference Suffix: A - Alternate, S - Self Governance, FT - Fast Track Self Governance, V - Varied

Mod Proposing Date Live/ Text Text Modification Title Category Workgroup Current Status Next Stage Key date* Legal Text Provider Text Requested Text Due Std Met ACS Ref Organisation Raised Closed Rotation Delivered

Panel 0711 Update of AUG Table to reflect new EUC bands Gazprom 11-Nov-19 Closed Modification Distribution Implemented Effective date 01-Oct-21 Northern Gas Networks 3 Requested Text 06/02/2020 28/01/2020 Y 16/01/20

CDSP provision of Class 1 read Wales & West 0710 S 08-Nov-19 Closed Self-Governance Distribution Implemented Effective date tbc Wales & West Utilites n/a service Utilities

Amendment of references to Data Protection Wales & West 0709 FT 08-Nov-19 Closed Fast Track None Implemented Effective date 12-Dec-19 Wales & West Utilites n/a 07/11/2019 Act for GDPR Utilities

Re-ordering of the UNC in advance of Faster Northern Gas 0708 S 08-Nov-19 Closed Self-Governance Governance Implemented Effective date tbc Northern Gas Networks n/a Switching Networks

Introducing ‘Performance Assurance No Text req'd - 0707 S Framework Administrator’ as a new User type Shell 08-Nov-19 Closed Self-Governance Distribution Implemented Effective date 14-Apr-20 n/a n/a enabling Mod to the Data Permissions Matrix

Instances where Shippers can exit commercial Contract Natural 0706 R 31-Oct-19 Closed Request Distribution Withdrawn End of process 25-Feb-20 n/a n/a agreements with an independent Supplier Gas Ltd

Allocated to 0705 R NTS Capacity Access Review National Grid NTS 10-Oct-19 Live Request Transmission Report to Panel 21-Oct-21 n/a n/a Workgroup

0704 S Review of Transporter Theft Reporting SGN 04-Oct-19 Closed Self-Governance Distribution Implemented Effective date 15-Jun-20 SGN n/a

Correction to Modification 0689S Text provided 0703 S 'Improvements to Margins Notice National Grid NTS 04-Oct-19 Closed Self-Governance Transmission Implemented Effective date 25-Nov-19 National Grid NTS n/a with mod Arrangements'

Introducing ‘Research Body’ as a new User 0702 S type to the Data Permissions Matrix and UNC Gazprom Energy 11-Sep-19 Closed Self-Governance Distribution Implemented Effective date tbc Cadent 2 TPD Section V5

Aligning Capacity booking under the UNC and Northern Gas 0701 01-Aug-19 Closed Modification Distribution Implemented Effective date TBC Northern Gas Networks n/a arrangements set out in relevant NExAs Networks

0700 Enabling large scale utilisation of Class 3 Gazprom Energy 19-Jul-19 Closed Urgent Distribution Implemented Effective date 28-Sep-19 Cadent 2

Incentivise Key Areas of Performance using 0699 Scottish Power 10-Jul-19 Closed Modification Distribution Withdrawn End of process 21-Jan-20 Scotia Gas Networks 1 additional UIG Charges

Text provided 0698 S Improvements to Margins Notice Arrangements National Grid NTS 09-Jul-19 Closed Self-Governance Transmission Implemented Effective date 09-Sep-19 National Grid NTS n/a 18/07/2019 18/07/2019 Y with mod

Panel Alignment of the UNC TPD Section V5 and the 0697 VS Gazprom Energy 17-Sep-20 Closed Self-Governance Distribution Implemented Effective date 18-Nov-20 Cadent 8 Requested Text 17/09/2020 17/09/2020 Y Data Permissions Matrix 17/09/2020

Panel Alignment of the UNC TPD Section V5 and the 0697 S Gazprom Energy 08-Jul-19 Closed Self-Governance Distribution Withdrawn End of process 17-Sep-20 Cadent 8 Requested Text 19/08/2020 19/08/2020 Y Data Permissions Matrix 19/08/2020

Aligning Capacity booking under the UNC and Northern Gas 0696 A arrangements set out in relevant NExAs 01-Aug-19 Closed Modification Distribution Withdrawn End of process 15-Aug-19 Wales & West Utilities 7 Networks (Renumbered to 0701)

Addressing inequities between Capacity Panel Panel 0696 V booking under the UNC and arrangements set Gazprom Energy 19-Mar-20 Live Modification Distribution recommended Ofgem decision 21-May-20 Wales & West Utilities 7 Requested Text 09/04/2020 19/03/2020 Y out in relevant NExAs implementation 19/03/2020

Addressing inequities between Capacity Panel 0696 booking under the UNC and arrangements set Gazprom Energy 12-Jun-19 Closed Modification Distribution Withdrawn End of process 19-Mar-20 Wales & West Utilities 7 Requested Text 06-Sep-19 06/09/2019 Y out in relevant NExAs 15/08/2019

Obligations on Shippers to pass Transporter Northern Gas Text provided 0695 S compensation payments on to consumers, via 10-Jun-19 Closed Self-Governance Distribution Implemented Effective date 08-Nov-19 Northern Gas Networks n/a 17/09/2019 17/09/2019 Y Networks with mod Suppliers

© all rights reserved Page 5 of 19 Printed 06/09/2021 15:09 Joint Office of Gas Transporters http://www.gasgovernance.com/Code/Modifications/

UNC Modification Register *Key Dates are normally an end-date, where shown red this is date sent to Ofgem Modification Reference Suffix: A - Alternate, S - Self Governance, FT - Fast Track Self Governance, V - Varied

Mod Proposing Date Live/ Text Text Modification Title Category Workgroup Current Status Next Stage Key date* Legal Text Provider Text Requested Text Due Std Met ACS Ref Organisation Raised Closed Rotation Delivered

Wales & West 0694 R CDSP provision of Class 1 Read service 31-May-19 Closed Request Distribution Withdrawn End of process 25-Nov-19 n/a Utilities

Treatment of kWh error arising from statutory 0693 R Scottish Power 23-May-19 Closed Request Distribution Request Closed End of process 21-Jan-21 n/a volume-energy conversion

Total Gas and Text provided 0692 S Automatic updates to Meter Read Frequency 02-May-19 Closed Self-Governance Distribution Implemented Effective date tbc Cadent 6 Power with mod

Panel CDSP to convert Class 2, 3 or 4 meter points to 0691 S Centrica 09-Apr-19 Closed Self-Governance Distribution Implemented Effective date tbc Scotia Gas Networks 5 Requested Text 12/03/2020 12/03/2020 Y Class 1 when G1.6.15 criteria are met 20/02/2020

Panel 0690 S Reduce qualifying period for Class 1 Centrica 09-Apr-19 Closed Self-Governance UIG Implemented Effective date 25-Mar-20 Cadent 4 Requested Text 12/12/2019 21/11/2019

Removing the requirement to support Invoice 0689 queries before the due date with information Gazprom 09-Apr-19 Closed Modification Distribution Withdrawn End of process 13-Sep-19 Northern Gas Networks 3 from the .AML file

Recovery of Shipper Losses incurred in Contract Natural 0688 09-Apr-19 Closed Modification Transmission Withdrawn End of process 02-Oct-19 Cadent 2 Supplier of Last Resort events Gas Ltd

Panel Panel Creation of new charge to recover Last Resort Total Gas and 0687 09-Apr-19 Live Modification Distribution recommended Ofgem decision 17-Oct-19 Scotia Gas Networks 1 Requested Text 06/09/2019 19/08/2019 Y Supply Payments Power implementation 15/08/2019

Panel Removal of the NTS Optional Commodity Rate Vermilion Energy 0686 02-Apr-19 Closed Modification NTS CMF Rejected End of process 18-Jun-21 National Grid NTS n/a Requested Text 14/05/2019 15/05/2019 N with adequate notice Ireland Ltd 18/4/19

Panel Amendment of the UNC term ‘Gas Deficit 0685 National Grid NTS 02-Apr-19 Closed Modification None Implemented Effective date 01-Oct-19 National Grid NTS n/a Requested Text 14/05/2019 29/04/2019 Y Warning’ to ‘Gas Balancing Notification’ 18/04/19

Amendment of the Data Permission Panel 0684 S Matrix to add Meter Asset Provider as a new Scottish Power 14-Mar-19 Closed Self-Governance Distribution Implemented Effective date 28-Jun-19 Cadent 8 Requested Text 11/04/2019 27/03/2019 Y User type Document - Phase 1 21/03/19

Offtake Arrangements Document (OAD) 0683 S Cadent 11-Mar-19 Closed Self-Governance Offtake Implemented Effective date 15-Jun-20 Cadent n/a Review Updates – Phase 1

Panel Market Participant MDD Migration to UNC 0682 E.ON UK 08-Mar-19 Closed Modification Distribution Implemented Effective date 28-Feb-20 Wales & West Utilities 7 Requested Text 14/05/2019 20/05/2019 N Governance from the SPAA 18/4/19

Panel Improvements to the quality of the Conversion 0681 S E.ON UK 06-Mar-19 Closed Self-Governance UIG Implemented Effective date 25-Mar-20 Cadent 6 Requested Text 07/06/2019 04/06/2019 Y Factor values held on the Supply Point Register 16/05/19

Panel UNC Changes as a Consequence of ‘no deal’ 0680 VS National Grid NTS 01-Nov-19 Closed Self-Governance Transmission Withdrawn End of process 18-Feb-20 National Grid NTS Requested Text 14/03/2019 United Kingdom Exit from the European Union 21/02/19

Panel UNC Changes as a Consequence of ‘no deal’ 0680 S National Grid NTS 07-Feb-19 Closed Self-Governance Transmission Withdrawn End of process 01-Nov-19 National Grid NTS Requested Text 14/03/2019 United Kingdom Exit from the European Union 21/02/19

Amendments to Gas Transmission Charging 0679 Regime (Postage Stamp) (Renumbered to RWE Npower 24-Jan-19 Closed Urgent Other Withdrawn End of process 28-Jan-19 National Grid NTS 0678A)

Amendments to Gas Charging Regime South Hook Gas 0678 J (Postage Stamp) including a Cost based 19-Mar-19 Closed Urgent Other Rejected End of process 28-May-20 National Grid NTS Company Ltd Optional Capacity Charge

Amendments to Gas Transmission Charging 0678 I Gazprom 27-Feb-19 Closed Urgent Other Rejected End of process 28-May-20 National Grid NTS Regime

Amendments to Gas Transmission Charging 0678 H Regime (Postage Stamp) including a Cost EP UK Investments 27-Feb-19 Closed Urgent Other Rejected End of process 28-May-20 National Grid NTS based Optional Capacity Charge

© all rights reserved Page 6 of 19 Printed 06/09/2021 15:09 Joint Office of Gas Transporters http://www.gasgovernance.com/Code/Modifications/

UNC Modification Register *Key Dates are normally an end-date, where shown red this is date sent to Ofgem Modification Reference Suffix: A - Alternate, S - Self Governance, FT - Fast Track Self Governance, V - Varied

Mod Proposing Date Live/ Text Text Modification Title Category Workgroup Current Status Next Stage Key date* Legal Text Provider Text Requested Text Due Std Met ACS Ref Organisation Raised Closed Rotation Delivered

Amendments to Gas Transmission Charging 0678 G Regime including a Cost based Optional Vitol SA Geneva 26-Feb-19 Closed Urgent Other Rejected End of process 28-May-20 National Grid NTS Capacity Charge

Amendments to Gas Transmission Charging 0678 F Regime – Treatment of Unprotected Entry Storengy UK Limited 22-Feb-19 Closed Urgent Other Rejected End of process 28-May-20 National Grid NTS Capacity and Storage

Amendments to Gas Charging Regime – Gateway LNG 0678 E 20-Feb-19 Closed Urgent Other Rejected End of process 28-May-20 National Grid NTS Treatment of Storage Company Ltd

Amendments to Gas Transmission Charging 0678 D ENI 20-Feb-19 Closed Urgent Other Rejected End of process 28-May-20 National Grid NTS Regime

Amendments to Gas Charging Regime 0678 C SSE 15-Feb-19 Closed Urgent Other Rejected End of process 28-May-20 National Grid NTS (Postage Stamp)

Amendments to Gas Transmission Charging 0678 B Centrica 06-Feb-19 Closed Urgent Other Rejected End of process 28-May-20 National Grid NTS Regime

Amendments to Gas Transmission Charging 0678 A RWE 28-Jan-19 Closed Urgent Other Implemented Effective date 01-Oct-20 National Grid NTS Regime (Postage Stamp)

Amendments to Gas Transmission Charging 0678 National Grid NTS 17-Jan-19 Closed Urgent Other Rejected End of process 28-May-20 National Grid NTS Regime

0677 R Shipper Supplier Theft Reporting Request first:utility 04-Jan-19 Closed Request Other Request Closed End of process 21-Nov-19 n/a

Review of Gas Transporter Joint Office 0676 R Gazprom 24-Dec-18 Closed Request Governance Withdrawn End of process 22-Feb-21 SGN 5 Arrangements

Enabling changes to the BBL Interconnection No Text req'd - 0675 S National Grid NTS 11-Dec-18 Closed Self-Governance Transmission Implemented Effective date 12-Jul-19 National Grid NTS Agreement to facilitate physical reverse flow enabling Mod

Performance Assurance Techniques and Allocated to Panel requested 0674 Scottish Power 07-Nov-18 Live Modification Other Report to Panel 16-Dec-21 Cadent 4 11/02/2021 Controls Workgroup text 21/01/21

Amendment of UNC and DSC arrangements to 0673 enable Xoserve to bid for and provide CSS Gazprom 19-Oct-18 Closed Urgent Other Implemented Effective date 30-Nov-18 Northern Gas Networks 3 Services

Panel Target, Measure and Reporting Product Class 4 0672 S Scottish Power 08-Oct-18 Closed Self-Governance UIG Implemented Effective date 07-Sep-20 Cadent 2 Requested Text 12/12/2019 06/12/2019 Y Read Performance 21/11/19

New Capacity Exchange process at NTS exit Wales & West 0671 08-Oct-18 Closed Modification Transmission Withdrawn End of process 16-Aug-19 n/a points for capacity below baseline Utilities

Review of the charging methodology to avoid No Text req'd - 0670 R National Grid NTS 08-Oct-18 Closed Request NTS CMF Request Closed End of process 16-Jul-20 National Grid NTS the inefficient bypass of the NTS Request

Review of the Gas Deficit Warning (GDW) and 0669 R National Grid NTS 07-Sep-18 Closed Request Transmission Request Closed End of process 15-Aug-19 National Grid NTS Margins Notice (MN) Arrangements

Amendment of the Data Permission Matrix to 0668 S E.ON UK 06-Sep-18 Closed Self-Governance Distribution Implemented Effective date 01-Mar-19 Scotia Gas Networks 1 19/12/2018 N add Alt Han Company as a new User type

Panel Inclusion and Amendment of Entry Incremental South Hook Gas 0667 06-Sep-18 Closed Modification Transmission Rejected End of process 20-Feb-20 National Grid NTS Requested Text 11/04/2019 16/04/2019 N Capacity Release NPV test in UNC Company Ltd 21/03/19

Establishment of a CSS Bid Group or CDSP Text provided 0666 Gazprom 15-Aug-18 Closed Urgent Other Implemented Effective date 11-Sep-18 Cadent 8 29/08/2018 29/08/2018 Y central switching system bid activities with mod

© all rights reserved Page 7 of 19 Printed 06/09/2021 15:09 Joint Office of Gas Transporters http://www.gasgovernance.com/Code/Modifications/

UNC Modification Register *Key Dates are normally an end-date, where shown red this is date sent to Ofgem Modification Reference Suffix: A - Alternate, S - Self Governance, FT - Fast Track Self Governance, V - Varied

Mod Proposing Date Live/ Text Text Modification Title Category Workgroup Current Status Next Stage Key date* Legal Text Provider Text Requested Text Due Std Met ACS Ref Organisation Raised Closed Rotation Delivered

Panel 0665 Changes to Ratchet Regime Gazprom 14-Aug-18 Closed Modification Other Implemented Effective date 01-Oct-19 SGN 7 (5) Requested Text 14/03/2019 21/02/19

Transfer of Sites with Low Read Submission Panel 0664 VVS Performance from Class 2 and 3 into Class 4 SSE 17-Jun-21 Closed Self-Governance Distribution Implemented Effective date TBC Cadent 6 Requested Text 17/09/2020 17/09/2020 Y (adopted) 17/09/20

Transfer of Sites with Low Read Submission Panel 0664 V Performance from Class 2 and 3 into Class 4 SSE 17-Sep-20 Closed Modification Distribution Withdrawn End of process 17-Jun-21 Cadent 6 Requested Text 17/09/2020 17/09/2020 Y (adopted) 17/09/20

Transfer of Sites with Low Read Submission Panel 0664 Performance from Class 2 and 3 into Class 4 SSE 28-Jun-19 Closed Modification UIG Withdrawn End of process 17-Sep-20 Cadent 6 Requested Text 06/02/2020 29/01/2020 Y (adopted) 16/01/20

Transfer of Sites with Low Read Submission 0664 Npower 06-Aug-18 Closed Modification UIG Withdrawn End of process 26-Jun-19 Cadent 6 Performance from Class 2 and 3 into Class 4

Extending the data comprised under the 0663 S definition of Supply Point Premises Data (TPD Scottish Power 06-Jul-18 Closed Self-Governance Distribution Withdrawn End of process 27-Nov-18 Wales & West Utilities 5 (7) V5.18.1)

0662 Revenue Recovery at Combined ASEPs National Grid NTS 12-Jun-18 Closed Modification Transmission Withdrawn End of process 09-Jan-20 National Grid

0661 R Reconciliation and Imbalance Cash Out Prices Winchester Gas 11-Jun-18 Closed Request Other Request Closed End of process 16-May-19 n/a n/a

Panel Amendment to PARR permissions to allow 0660 S Centrica 08-Jun-18 Closed Self-Governance Distribution Implemented Effective date 07-Dec-18 Cadent 4 Requested Text 11/10/2018 PAC to update with UNCC approval 20/09/18

Improvements to the Composite Weather Panel requested 0659 S E.ON UK 29-May-18 Closed Self-Governance UIG Withdrawn End of process 14-Nov-18 Northern Gas Networks 3 08/11/2018 Variable Text 18/10/18

CDSP to identify and develop improvements to Total Gas and 0658 25-May-18 Closed Urgent None Implemented Effective date 06-Jul-18 Cadent 2 LDZ settlement processes Power

Adding AQ reporting to the PARR Schedule 0657 S Npower 30-Apr-18 Closed Self-Governance Distribution Implemented Effective date 12-Oct-18 SGN 1 N/A reporting suite

Panel 0656 Changes to Modification Panel arrangements Gazprom 30-Apr-18 Closed Modification Governance Implemented Effective date 28-Nov-18 Cadent 8 Requested Text 07/09/2018 17/08/2018 Y 16/08/18

Requiring a Meter Reading following a change 0655 S Gazprom 06-Apr-18 Closed Self-Governance Distribution Withdrawn End of process 16-Jul-18 Wales & West Utilities 7 of Local Distribution Zone or Exit Zone.

Panel requested 0654 S Mandating the provision of NDM sample data E.ON UK 28-Mar-18 Closed Self-Governance UIG Implemented Effective date 01-Mar-19 Scotia Gas Networks 5 16/08/2018 16/08/2018 Y Text 16/08/18

Updating the parameters for the NTS Optional 0653 Commodity Charge – Introducing the NTS Centrica 15-Mar-18 Closed Modification NTS CMF Withdrawn End of process 13-Aug-18 National Grid NTS n/a Optional Capacity Charge

Introduction of winter read/consumption reports Panel requested 0652 Npower 07-Mar-18 Closed Modification UIG Implemented Effective date tbd Northern Gas Networks 3 08/11/2018 16/11/2018 N and associated obligations Text 18/10/18

Changes to the Retrospective Data Update Panel requested 0651 Cadent 05-Mar-18 Closed Modification Distribution Implemented Effective date tbd n/a n/a 18/07/2018 18/07/2018 Y provisions Text 18/07/18

Minor Typographical Correction to UNC0638V Northern Gas 0650 FT 28-Feb-18 Closed Fast Track Distribution Implemented Effective date 10-Apr-18 n/a Legal Text Networks

Panel Update to UNC to formalise the Data Enquiry 0649 S Gazprom 26-Feb-18 Closed Self-Governance Distribution Implemented Effective date 09-Nov-18 Cadent 2 Requested Text 07/09/2018 17/08/2018 Y Service Permissions Matrix 16/08/18

© all rights reserved Page 8 of 19 Printed 06/09/2021 15:09 Joint Office of Gas Transporters http://www.gasgovernance.com/Code/Modifications/

UNC Modification Register *Key Dates are normally an end-date, where shown red this is date sent to Ofgem Modification Reference Suffix: A - Alternate, S - Self Governance, FT - Fast Track Self Governance, V - Varied

Mod Proposing Date Live/ Text Text Modification Title Category Workgroup Current Status Next Stage Key date* Legal Text Provider Text Requested Text Due Std Met ACS Ref Organisation Raised Closed Rotation Delivered

Panel End dating the revised DM Read estimation 0648 S Gazprom 06-Feb-18 Closed Self-Governance Distribution Implemented Effective date 11-Jun-18 Scotia Gas Networks 1 Requested Text 08/03/2018 26/02/2018 Y process introduced by Modification 0634 15/02/18

Wales & West 0647 Opening Class 1 reads to Competition 18-Jan-18 Closed Modification Distribution Withdrawn End of process 20-Jun-19 n/a Utilities

Allocated to 0646 R Review of the Offtake Arrangements Document Cadent 10-Jan-18 Live Request Oftake Report to Panel 21-Oct-21 n/a Workgroup

Panel Amending the oxygen content limit in the 0645 S South Hook Gas Ltd 02-Jan-18 Closed Self-Governance Transmission Implemented Effective date 11-Jun-18 National Grid NTS Requested Text 08/03/2018 16/02/2018 Y Network Entry Agreement at South Hook LNG 15/02/18

Improvements to nomination and reconciliation 0644 through the introduction of new EUC bands and E.ON UK 15-Dec-17 Closed Modification Distribution Withdrawn End of process 27-Jul-18 Cadent 2 (6) improvements for the ALP and DAF

(Urgent) - Changes to settlement regime to 0643 address Unidentified Gas issues including Orsted Sales 15-Dec-17 Closed Urgent Distribution Rejected End of process 17-Aug-18 Cadent 2 (4) retrospective correction

Panel (Urgent) - Changes to settlement regime to 0642 A E.ON UK 22-Dec-17 Closed Urgent UIG Rejected End of process 17-Aug-18 Cadent 2 Requested 08/02/2018 01/02/2018 Y address Unidentified Gas issues 18/01/18

(Urgent) - Changes to settlement regime to 0642 Corona Energy 15-Dec-17 Closed Urgent Distribution Rejected End of process 17-Aug-18 Cadent 2 address Unidentified Gas issues

Amendments to Modification 0431 - Panel 0641 S Shipper/Transporter - Meter Point Portfolio Centrica 08-Dec-17 Closed Self-Governance Distribution Implemented Effective date 11-Jun-18 Cadent 8 Requested 08/02/2018 07/03/2018 N Reconciliation rules and obligations 18/01/18

Panel Provision of access to Domestic Consumer 0640 S Centrica 08-Dec-17 Closed Self-Governance Distribution Implemented Effective date 10-Apr-18 Wales & West Utilities 7 Requested Text 17/01/2018 17/01/2018 Y data for Suppliers 21/12/17

Review of AUGE Framework and 0639 R Gazprom 07-Dec-17 Closed Request Individual Request Closed End of process 21-Jun-18 n/a n/a Arrangements

Panel Mandate monthly read submission for Smart 0638 V Centrica Energy 21-Dec-17 Closed Modification Distribution Implemented Effective date 01-Apr-18 Northern Gas Networks 3 Requested Text 16/01/2018 08/01/2018 Y and AMR sites from 01 April 2018 21/12/17

Panel Mandate monthly read submission for Smart 0638 Centrica Energy 30-Oct-17 Closed Modification Distribution Withdrawn End of process 21-Dec-17 Northern Gas Networks 3 Requested Text 09/11/2017 07/11/2017 Y and AMR sites from 01 April 2018 19/10/17

Panel Amending the permissions to release data to 0637 S E.ON UK 11-Oct-17 Closed Self-Governance Distribution Implemented Effective date 08-Dec-17 Cadent 6 Requested Text 19/10/2017 19/10/2017 Y Meter Asset Provider organisations 19/10/17

Updating the parameters for the NTS Optional 0636 D Commodity Charge while complying with the Gazprom 06-Apr-18 Closed Modification NTS CMF Rejected End of process 31-Jul-18 National Grid NTS n/a EU Tariff Code Updating the parameters for the NTS Optional Commodity Charge – Introducing the NTS 0636 C* Centrica 20-Feb-18 Closed Modification NTS CMF Withdrawn End of process 13-Aug-18 National Grid NTS n/a Optional Capacity Charge (Renumbered to 0653) Panel Updating the parameters for the NTS Optional 0636 C Aughinish Alumina 02-Mar-18 Closed Modification NTS CMF Rejected End of process 31-Jul-18 National Grid NTS n/a Requested Text 09/04/2018 03/04/2018 Y Commodity Charge 15/03/18

Panel Updating the parameters for the NTS Optional 0636 B SSE 01-Feb-18 Closed Modification NTS CMF Rejected End of process 31-Jul-18 National Grid NTS n/a Requested Text 08/03/2018 03/04/2018 N Commodity Charge 15/02/18

Panel Updating the parameters for the NTS Optional 0636 A Vitol S.A. Geneva 05-Jan-18 Closed Modification NTS CMF Rejected End of process 31-Jul-18 National Grid NTS n/a Requested 08/02/2018 03/04/2018 N Commodity Charge 18/01/18

Panel Updating the parameters for the NTS Optional Vermilion Energy 0636 10-Oct-17 Closed Modification NTS CMF Rejected End of process 31-Jul-18 National Grid NTS n/a Requested Text 16/01/2018 03/04/2018 N Commodity Charge Ireland Ltd 21/12/17

© all rights reserved Page 9 of 19 Printed 06/09/2021 15:09 Joint Office of Gas Transporters http://www.gasgovernance.com/Code/Modifications/

UNC Modification Register *Key Dates are normally an end-date, where shown red this is date sent to Ofgem Modification Reference Suffix: A - Alternate, S - Self Governance, FT - Fast Track Self Governance, V - Varied

Mod Proposing Date Live/ Text Text Modification Title Category Workgroup Current Status Next Stage Key date* Legal Text Provider Text Requested Text Due Std Met ACS Ref Organisation Raised Closed Rotation Delivered

Reforms to incentivise accurate and timely DM Wales & West 0635 A reads and to remove the Transporter Class 1 10-Jan-18 Closed Modification Distribution Renumbered End of process 18-Jan-18 SGN 5 Utilities read obligation

Reforms to incentivise accurate and timely DM 0635 reads for Class 2 Meter Points to improve the first:utility 09-Oct-17 Closed Modification Distribution Withdrawn End of process 20-Feb-18 SGN 5 accuracy of Unidentified Gas allocation

Panel (Urgent) - Revised estimation process for DM 0634 first:utility 09-Oct-17 Closed Urgent Distribution Implemented Effective date 20-Nov-17 Cadent 4 Requested Text 09/11/2017 07/11/2017 Y sites with D-7 zero consumption 19/10/17

Panel Mandate monthly read submission for Smart 0633 V Corona Energy 21-Dec-17 Closed Modification Distribution Rejected End of process 31-Jan-18 Northern Gas Networks 3 Requested Text 16/01/2018 08/01/2018 Y and AMR sites from 01 February 2018 21/12/17

Panel Mandate monthly read submission for Smart 0633 Corona Energy 09-Oct-17 Closed Modification Distribution Withdrawn End of process 21-Dec-17 Northern Gas Networks 3 Requested Text 09/11/2017 07/11/2017 Y and AMR sites from 01 December 2017 19/10/17

Panel 0632 S Shipper asset details reconcilation Corona Energy 09-Oct-17 Closed Self-Governance Distribution Implemented Effective date 10-Apr-18 Cadent 2 Requested 08/02/2018 24/01/2018 Y 18/01/18

0631 R Review of NDM algorithm post-Nexus Corona Energy 06-Oct-17 Closed Request Distribution Request Closed End of process 19-Apr-18 n/a n/a

Review of the consequential changes required 0630 R in UNC as a result of the Ofgem Switching Cadent 06-Oct-17 Closed Request Distribution Request Closed End of process 16-May-19 n/a n/a Programme

Standard Design Connections: A2O connection Text provided 0629 S National Grid NTS 04-Oct-17 Closed Self-Governance Transmission Implemented Effective date 30-Oct-18 National Grid NTS n/a 26/03/2018 N process modification with mod

Text provided 0628 S Standard Design Connections: PARCA process National Grid NTS 04-Oct-17 Closed Self-Governance Transmission Implemented Effective date 30-Oct-18 National Grid NTS n/a 26/03/2018 N with mod

Removal of the absolute requirement to include Panel 0627 S a Remotely Operable Valve (ROV) Installation National Grid NTS 08-Sep-17 Closed Self-Governance Transmission Implemented Effective date 17-Jan-18 National Grid NTS n/a Requested Text 16/11/2017 16/11/2017 Y for all new NTS Exit Connections 16/11/17

Updating UNC Section B to correct a number of 0626 FT references to the timing of processes National Grid NTS 08-Sep-17 Closed Fast Track Transmission Implemented Effective date 13-Oct-17 National Grid NTS n/a associated with the start of a Gas Day

Panel Extension of 4 months to 10 months to transfer 0625 Gazprom 01-Aug-17 Closed Modification Distribution Implemented Effective date 28-Nov-17 SGN 1 Requested Text 19/10/2017 19/10/2017 Y non-mandatory sites from Class 1 19/10/17

Review of arrangements for Retrospective No Text req'd - 0624 R Adjustment of Meter Information, Meter Cadent 07-Jul-17 Closed Request Other Request Closed End of process 15-Feb-18 N/A - Request n/a Request Point/Supply Point and Address data

Panel Governance Arrangements for Alternatives to Wales & West 0623 03-Jul-17 Closed Modification Governance Implemented Effective date 20-Apr-18 Wales & West Utilities n/a Requested Text 07/12/2017 30/11/2017 Y Self-Governance Modification Proposals Utilities 16/11/17

Correct allocation of Shrinkage Error as 0622 Gazprom 13-Jun-17 Closed Modification Distribution Withdrawn End of process 03-Jul-17 Cadent 8 identified by the AUGE

Amendments to Gas Transmission Charging 0621 L Shell 26-Apr-18 Closed Modification NTS CMF Rejected End of process 20-Dec-18 National Grid NTS n/a Regime

Amendments to Gas Transmission Charging Gateway LNG 0621 K 24-Apr-18 Closed Modification NTS CMF Rejected End of process 20-Dec-18 National Grid NTS n/a Regime Company Ltd

Amendments to Gas Transmission Charging 0621 J RWE 08-Mar-18 Closed Modification NTS CMF Rejected End of process 20-Dec-18 National Grid NTS n/a Regime

Amendments to Gas Transmission Charging 0621 H E.ON UK 02-Mar-18 Closed Modification NTS CMF Rejected End of process 20-Dec-18 National Grid NTS n/a Regime

© all rights reserved Page 10 of 19 Printed 06/09/2021 15:09 Joint Office of Gas Transporters http://www.gasgovernance.com/Code/Modifications/

UNC Modification Register *Key Dates are normally an end-date, where shown red this is date sent to Ofgem Modification Reference Suffix: A - Alternate, S - Self Governance, FT - Fast Track Self Governance, V - Varied

Mod Proposing Date Live/ Text Text Modification Title Category Workgroup Current Status Next Stage Key date* Legal Text Provider Text Requested Text Due Std Met ACS Ref Organisation Raised Closed Rotation Delivered

Amendments to Gas Transmission Charging 0621 G Vitol S.A. Geneva 02-Mar-18 Closed Modification NTS CMF Withdrawn End of process 20-Apr-18 National Grid NTS n/a Regime

Amendments to Gas Transmission Charging 0621 F Interconnector 02-Feb-18 Closed Modification NTS CMF Rejected End of process 20-Dec-18 National Grid NTS n/a Regime

Amendments to Gas Transmission Charging 0621 E Uniper Energy 02-Feb-18 Closed Modification NTS CMF Rejected End of process 20-Dec-18 National Grid NTS n/a Regime

Amendments to Gas Transmission Charging Wales & West 0621 D 01-Feb-18 Closed Modification NTS CMF Rejected End of process 20-Dec-18 National Grid NTS n/a Regime Utilities

Amendments to Gas Transmission Charging 0621 C Centrica 01-Feb-18 Closed Modification NTS CMF Rejected End of process 20-Dec-18 National Grid NTS n/a Regime

Amendments to Gas Transmission Charging 0621 B SSE 12-Dec-17 Closed Modification NTS CMF Rejected End of process 20-Dec-18 National Grid NTS n/a Regime

Amendments to Gas Transmission Charging 0621 A Storengy 12-Dec-17 Closed Modification NTS CMF Rejected End of process 20-Dec-18 National Grid NTS n/a Regime

Amendments to Gas Transmission Charging 0621 National Grid NTS 05-Jun-17 Closed Modification NTS CMF Rejected End of process 20-Dec-18 n/a n/a Regime

Deferral of the UK Link Manual delivery date Text provided 0620 S Cadent 02-Jun-17 Closed Self-Governance Distribution Implemented Effective date 31-Jul-17 n/a n/a 05/06/2017 05/06/2017 Y (further revision) with mod

Panel Application of proportionate ratchet charges to 0619 B Centrica Energy 31-Oct-17 Closed Modification Distribution Rejected End of process 27-Jul-18 Wales & West Utilities 7 Requested Text 16/01/2018 16/01/2018 Y daily read sites 21/12/17

Panel Protection from ratchet charges for daily read Scotia Gas 0619 A 08-Sep-17 Closed Modification Distribution Rejected End of process 27-Jul-18 Wales & West Utilities 7 Requested Text 16/01/2018 27/10/2017 Y customers with an AQ of 732,00kWh and below Networks 21/12/17

Panel Application of proportionate ratchet charges to 0619 Gazprom 10-May-17 Closed Modification Distribution Rejected End of process 27-Jul-18 Wales & West Utilities 7 Requested Text 12/10/2017 20/09/2017 Y daily read sites 21/09/17

Extension of Invoicing Contingency Wales & West Text provided 0618 03-May-17 Closed Urgent Distribution Implemented Effective date 01-Jun-17 Wales & West Utilities n/a 05/05/2017 05/05/2017 Y Arrangements in case of Project Nexus defect Utilities with mod

Text provided 0617 S Revised UK Link Manual delivery date Cadent 07-Apr-17 Closed Self-Governance Distribution Implemented Effective date 01-Jun-17 Cadent n/a 20/04/2017 20/04/2017 Y with mod

Panel Capacity Conversion Mechanism for 0616 S National Grid NTS 06-Apr-17 Closed Self-Governance Transmission Implemented Effective date 10-Nov-17 National Grid NTS n/a Requested Text 08/09/2017 07/09/2017 Y Interconnection Points 17/08/17

Panel Representation on DSC Committees – 0615 S E.ON UK 31-Mar-17 Closed Self-Governance Distribution Implemented Effective date 11-Sep-17 Cadent 6 Requested Text 06/07/2017 21/06/2017 Y amendment to include mid-year appointments 15/06/2017

Introducing IHD (In-Home Display) Installed No Text req'd - 0614 EDF Energy 08-Mar-17 Closed Modification Distribution Withdrawn End of process 14-Jun-17 n/a n/a Status of Failed enabling Mod

Panel Revised UK Link Manual CDSP Data Services 0613 S Cadent 07-Mar-17 Closed Self-Governance Distribution Implemented Effective date 13-Oct-17 Cadent n/a Requested Text 10/08/2017 09/08/2017 Y Document 20/07/17

Project Management and Assurance provisions Scotia Gas No Text req'd - 0612 R 06-Feb-17 Closed Request None Withdrawn End of process 21-Mar-17 Scotia Gas Networks n/a n/a for gas industry changes Networks Request

Panel Amendments to the firm capacity payable price 0611 S National Grid NTS 03-Feb-17 Closed Modification Transmission Implemented Effective date 11-Aug-17 National Grid NTS n/a Requested Text 09/06/2017 26/05/2017 Y n/a at Interconnection Points 18/05/17

© all rights reserved Page 11 of 19 Printed 06/09/2021 15:09 Joint Office of Gas Transporters http://www.gasgovernance.com/Code/Modifications/

UNC Modification Register *Key Dates are normally an end-date, where shown red this is date sent to Ofgem Modification Reference Suffix: A - Alternate, S - Self Governance, FT - Fast Track Self Governance, V - Varied

Mod Proposing Date Live/ Text Text Modification Title Category Workgroup Current Status Next Stage Key date* Legal Text Provider Text Requested Text Due Std Met ACS Ref Organisation Raised Closed Rotation Delivered

Panel 0610 S Project Nexus - Miscellaneous Requirements Cadent 11-Jan-17 Closed Self-Governance Distribution Implemented Effective date 07-Jun-17 Cadent n/a Requested Text 09/03/2017 17/02/2017 Y n/a 16/02/17 Transitional arrangements for gas settlement Panel and replacement of Meter Readings, retaining 0609 A British Gas 08-Feb-17 Closed Modification Distribution Withdrawn End of process 10-Mar-17 Cadent n/a Requested Text 09/03/2017 17/02/2017 Y AQ2017 16/02/17 (Project Nexus transitional modification) Transitional arrangements for gas settlement Panel 0609 and replacement of Meter Readings (Project Cadent 09-Jan-17 Closed Modification Distribution Implemented Effective date 22-May-17 Cadent n/a Requested Text 09/02/2017 17/02/2017 N n/a Nexus transitional modification) 19/01/17

Implementation of 'single service provision' Panel 0608 S arrangements for iGT connected system exit Cadent 09-Jan-17 Closed Self-Governance Distribution Implemented Effective date 15-May-17 Cadent n/a Requested Text 09/02/2017 01/02/2017 Y n/a points (Project Nexus transitional modification) 19/01/17

Amendment to Gas Quality NTS Entry No Text req'd - 0607 Specification at the St Fergus NSMP System BP 07-Dec-16 Closed Modification Transmission Implemented Effective date 28-Feb-18 National Grid NTS n/a enabling Mod Entry Point National Grid Gas plc and National Grid Gas Panel Nexus Imp 0606 S Distribution Limited transitional invoicing Cadent 05-Dec-16 Closed Self-Governance Distribution Implemented Effective date Cadent n/a Requested Text 09/02/2017 20/01/2017 Y n/a Date arrangement post Project Nexus 19/01/17 Amendments to TPD Section K - Additional Panel 0605 S Methods to Procure and Dispose of Operating National Grid NTS 02-Dec-16 Closed Self-Governance Transmission Implemented Effective date 11-Aug-17 National Grid NTS n/a Requested Text 09/02/2017 19/01/2017 Y n/a Margins Gas 19/01/17 Panel Central Data Services Provider – Arrangements Nexus Imp 0604 S Cadent 30-Nov-16 Closed Self-Governance Other Implemented Effective date Cadent n/a Requested Text 09/03/2017 16/02/2017 Y n/a following implementation of Project Nexus Date 16/02/17

Removal of liability for members of Wales & West Text provided 0603 S 08-Nov-16 Closed Self-Governance Distribution Implemented Effective date 11-Jan-17 Wales & West Utilities n/a 15/12/2016 15/12/2016 Y n/a Performance Assurance Committee Utilities with mod

Implementation of Non Effective Days and Panel Variant Non-Business Days for Project Nexus 0602 A RWE Npower 23-Dec-16 Closed Modification Distribution Implemented Effective date 20-Feb-17 Cadent n/a Requested Text 19/01/2017 19/01/2017 Y n/a Implementation, maintaining a minimum of two 19/01/17 Supply Point Business Days (Project Nexus Implementation of Non Effective Days and Panel Variant Non-Business Days for Project Nexus 0602 Cadent 07-Nov-16 Closed Modification Distribution Rejected End of process 17-Feb-17 Cadent n/a Requested Text 10/01/2017 12/01/2017 N n/a Implementation (Project Nexus transitional 15/12/16 modification) Revision of National Grid Gas plc’s Individual FT - text 0601 FT Network Code to reflect the correct company National Grid NTS 01-Nov-16 Closed Fast Track Transmission Implemented Effective date 09-Dec-16 National Grid NTS n/a provided with 17/11/2016 17/11/2016 Y n/a name mod

Panel Amend obligation for the acceptance of EPDQD 0600 S National Grid NTS 10-Oct-16 Closed Modification Transmission Implemented Effective date 07-Apr-17 National Grid NTS n/a Requested Text 10/11/2016 10/11/2016 Y n/a revisions made after D+5 20/10/16 Amendments to Capacity Allocations 0599 Mechanisms (Interruptible) to comply with EU National Grid NTS 10-Oct-16 Closed Modification European Withdrawn End of process 16-Nov-16 National Grid NTS n/a Mod withdrawn n/a Capacity Regulations Amendments to Capacity Allocations Panel 0598 S Mechanisms to comply with EU Capacity National Grid NTS 10-Oct-16 Closed Self-Governance Transmission Implemented Effective date 06-Apr-17 National Grid NTS n/a Requested Text 10/01/2017 16/12/2016 Y n/a Regulations 15/12/16 Panel Rules for the release of incremental capacity at 0597 National Grid NTS 10-Oct-16 Closed Modification Transmission Implemented Effective date 06-Apr-17 National Grid NTS n/a Requested Text 10/01/2017 23/12/2016 Y n/a Interconnection Points 15/12/16

Panel Implementing CGR3 decisions on Significant Wales & West 0596 07-Oct-16 Closed Modification Governance Implemented Effective date 17-Feb-17 Wales & West Utilities n/a Requested Text 10/11/2016 20/10/2016 Y n/a Code Reviews and self-governance Utilities 20/10/16

Amendment to the Arrangements between No Text req'd - 0595 S National Grid NTS and GNI at the Moffat IP to National Grid NTS 02-Sep-16 Closed Self-Governance Transmission Implemented Effective date 09-Dec-16 n/a n/a n/a enabling Mod Provide for Interruption of Virtual Reverse Flow Meter Reading Submission for Advanced & No Text req'd - 0594 R Gazprom 02-Sep-16 Closed Request Distribution Request Closed End of process 21-Dec-17 N/A - Request n/a n/a Smart Metering Request Provision of access to Domestic Consumer Panel Northern Gas 0593 V data for Price Comparison Websites and Third 20-Jul-17 Closed Modification Distribution Implemented Effective date 15-Dec-17 Northern Gas Networks n/a Requested Text 06/10/2016 07/10/2016 N n/a Networks Party Intermediaries 15/09/2016 Provision of access to Domestic Consumer Panel Northern Gas 0593 data for Price Comparison Websites and Third 08-Aug-16 Closed Modification Distribution Withdrawn End of process 20-Jul-17 Northern Gas Networks n/a Requested Text 06/10/2016 07/10/2016 N n/a Networks Party Intermediaries 15/09/2016 Separation of National Grid Transmission and Panel 0592 S Distribution owned networks - Transitional Cadent 13-Jul-16 Closed Self-Governance Distribution Implemented Effective date 30-Sep-16 Cadent n/a Requested Text 11/08/2016 05/08/2016 Y n/a invoicing arrangements 21/07/2016

© all rights reserved Page 12 of 19 Printed 06/09/2021 15:09 Joint Office of Gas Transporters http://www.gasgovernance.com/Code/Modifications/

UNC Modification Register *Key Dates are normally an end-date, where shown red this is date sent to Ofgem Modification Reference Suffix: A - Alternate, S - Self Governance, FT - Fast Track Self Governance, V - Varied

Mod Proposing Date Live/ Text Text Modification Title Category Workgroup Current Status Next Stage Key date* Legal Text Provider Text Requested Text Due Std Met ACS Ref Organisation Raised Closed Rotation Delivered

DSR - Removal of 7 day rolling profile Demand Side Text provided 0591 S National Grid NTS 13-Jul-16 Closed Self-Governance Implemented Effective date 12-Sep-16 National Grid NTS n/a 21/07/2016 21/07/2016 Y n/a functionality Response with mod

Review the options to remove the use of Fax No Text req'd - 0590 R E.ON UK 27-Jun-16 Closed Request Distribution Withdrawn End of process 16-Aug-16 n/a n/a machines within the UNC Request Panel Inclusion of CSEP Supply Meter Points within Nexus Imp 0589 S E.ON UK 27-Jun-16 Closed Self-Governance Distribution Implemented Effective date Scotia Gas Networks 5 Requested Text 11/08/2016 08/08/2016 Y n/a NDM Sampling Arrangements Date 21/07/2016 Review UNC arrangements relating to the Wales & West No Text req'd - 0588 R connection to and operation of gas fired 06-Jun-16 Closed Request Transmission Withdrawn End of process 05-Aug-16 n/a n/a Utilities Request generation on DN networks Panel 0587 Seasonal Energy Balancing Credit Cover 06-Jun-16 Closed Modification Transmission Implemented Effective date 01-May-17 National Grid NTS n/a Requested Text 09/09/2016 09/09/2016 Y Yes 18/08/2016 Resolution of minor legal text drafting conflicts Nexus Imp Text provided 0586 FT Cadent 06-Jun-16 Closed Fast Track Distribution Implemented Effective date Cadent n/a 16/06/2016 16/06/2016 Y n/a arising from UNC Modification 0432 Date with mod Separation of NTS and National Grid owned Panel 0585 networks – Calculation of Code Credit Limit Cadent 06-Jun-16 Closed Modification Distribution Withdrawn End of process 03-Aug-16 Cadent n/a Requested Text 07/07/2016 30/06/2016 Y n/a and Value at Risk 16/06/2016 Energy Theft Tip-Off Service (ETTOS) – Northern Gas Text provided 0584 S 01-Jun-16 Closed Self-Governance Distribution Implemented Effective date 12-Aug-16 Northern Gas Networks n/a 16/06/2016 16/06/2016 Y n/a Release of Supplier identity Networks with mod Panel Requiring an Opening Meter Reading at same Nexus Imp 0583 S Cadent 10-May-16 Closed Self-Governance Distribution Implemented Effective date Cadent n/a Requested Text 10/06/2016 10/06/2016 Y n/a User Confirmation Date 19/05/2016 Amendments to reflect separation in legal Panel ownership of NTS and National Grid owned 0582 S Cadent 09-May-16 Closed Self-Governance Distribution Implemented Effective date 12-Sep-16 Cadent n/a Requested Text 19/05/2016 19/05/2016 Y n/a LDZs to facilitate the sale of National Grid's 19/05/2016 Gas Distribution Business Amending the Oxygen content limit specified in No Text req'd - 0581 S British Gas Trading 08-Apr-16 Closed Self-Governance Transmission Implemented Effective date 12-Aug-16 n/a n/a n/a the Network Entry Agreement at Grain LNG enabling Mod Implementation of Non Effective Days to enable Scotia Gas Text provided 0580 VS Annual AQ Review (independent of Nexus 21-Jul-16 Closed Self-Governance Distribution Implemented Effective date 12-Aug-16 Scotia Gas Networks n/a 19/05/16 19/05/16 Y Networks with mod transition) Implementation of Non Effective Days to enable Scotia Gas Text provided 0580 S Annual AQ Review (independent of Nexus 07-Apr-16 Closed Self-Governance Distribution Withdrawn End of process 21-Jul-16 Scotia Gas Networks n/a 19/05/16 19/05/16 Y Networks with mod transition) FT - Text Updating code to reflect the correct ‘Designated 0579 FT British Gas 04-Apr-16 Closed Fast Track Governance Implemented Effective date 16-May-16 Cadent 4 provided with 21/04/16 21/04/16 Y n/a Person’ mod Implementation of Retrospective Invoice Panel 0578 Adjustment arrangements (Project Nexus Cadent 09-Mar-16 Closed Modification Nexus Implemented Effective date 18-Aug-16 Cadent n/a Requested Text 13/05/2016 13/05/2016 Y transitional modification) 21/04/2016 Aligning UNC to the indirect clearing model Text provided 0577 S National Grid NTS 09-Mar-16 Closed Self-Governance Transmission Implemented Effective date 16-May-16 National Grid NTS n/a 17/03/2016 17/03/2016 Y operated by ICE Endex with mod Generation of an estimated Meter Reading at Panel Nexus Imp 0576 the Code Cut Off Date in the absence of an Cadent 09-Mar-16 Closed Modification Nexus Implemented Effective date Cadent n/a Requested Text 13/05/2016 13/05/2016 Y Date actual Meter Reading 21/04/2016 Consider the Performance Assurance No Text req'd - 0575 R Scottish Power 03-Mar-16 Closed Request Offtake Request Closed End of process 18-Aug-16 n/a n/a Reporting Requirements for Transporters Request Creating the permission to release supply point Panel 0574 data to the Theft Risk Assessment Service RWE Npower 08-Feb-16 Closed Modification Distribution Implemented Effective date 09-Dec-16 Northern Gas Networks 3 Requested Text 07/07/2016 13/07/2016 N (TRAS) 16/06/2016 Project Nexus – deferral of implementation of Urgent - text Nexus Imp 0573 elements of Retrospective Adjustment Cadent 08-Feb-16 Closed Urgent Distribution Implemented Effective date Cadent n/a provided with Date arrangements mod Panel Amendment to the definition of AUG Year Nexus Imp 0572 British Gas 08-Jan-16 Closed Modification Distribution Implemented Effective date Scotia Gas Networks 1 Requested Text 10/03/2016 04/03/2016 Y within UNC TPD Section E Date 18/02/16 Application of Ratchet Charges to Class 1 Panel 0571 A Supply Points and Class 2 with an AQ above E.ON UK 05-May-16 Closed Modification Distribution Withdrawn End of process 11-May-17 Cadent n/a Requested Text 07/07/2016 22/06/2016 Y 73,200kWhs 16/06/2016 Panel Application of Ratchets Charges to Class 1 0571 Gazprom 24-Dec-15 Closed Modification Distribution Withdrawn End of process 10-May-17 Cadent 8 Requested Text 07/07/2016 22/06/2016 Y Supply Points Only 16/06/2016 Obligation on Shippers to provide at least one Panel 0570 valid meter reading per meter point into Scottish Power 03-Dec-15 Closed Modification Distribution Implemented Effective date tbc Cadent 6 Requested Text 06/07/2017 23/05/2017 Y settlement once per annum 15/06/2017 Panel Removal of the minimum security requirement 0569 S Locus Energy 03-Dec-15 Closed Self-Governance Transmission Implemented Effective date 11-Mar-16 National Grid NTS n/a Requested Text 11/02/2016 21/01/2016 Y n/a from the Energy Balancing Credit Rules 21/01/16 Security Requirements and Invoice Payment Panel 0568 Settlement Cycle for the Trading System ICE Endex 06-Nov-15 Closed Modification Transmission Implemented Effective date 01-Aug-16 National Grid NTS n/a Requested Text 11/02/2016 29/01/2016 Y Clearer 21/01/16

© all rights reserved Page 13 of 19 Printed 06/09/2021 15:09 Joint Office of Gas Transporters http://www.gasgovernance.com/Code/Modifications/

UNC Modification Register *Key Dates are normally an end-date, where shown red this is date sent to Ofgem Modification Reference Suffix: A - Alternate, S - Self Governance, FT - Fast Track Self Governance, V - Varied

Mod Proposing Date Live/ Text Text Modification Title Category Workgroup Current Status Next Stage Key date* Legal Text Provider Text Requested Text Due Std Met ACS Ref Organisation Raised Closed Rotation Delivered

Amendment to reference temperature No Text req'd - 0567 S conditions within the National Grid NTS – IUK National Grid NTS 06-Nov-15 Closed Self-Governance Transmission Implemented Effective date 12-Feb-16 n/a n/a enabling Mod Interconnection Agreement Panel UNC modification stakeholder engagement and Scotia Gas 0566 S 06-Nov-15 Closed Self-Governance Governance Implemented Effective date 12-Feb-16 Scotia Gas Networks n/a Requested Text 12/01/2016 17/12/2015 Y Guidelines Networks 17/12/15 Central Data Service Provider: General Scotia Gas Pane Requested 0565 B 26-Oct-16 Closed Modification Other Rejected End of process 19-Jan-17 National Grid Distribution n/a 18/11/2016 02/11/2016 Y n/a framework and obligations Networks Text 28/10/16 Panel Central Data Service Provider: General 0565 A E.ON UK 10-Oct-16 Closed Modification Other Implemented Effective date 01-Apr-17 National Grid Distribution n/a Requested Text 10/11/2016 02/11/2016 Y n/a framework and obligations 20/10/16 Panel Central Data Service Provider: General National Grid 0565 05-Nov-15 Closed Modification Other Rejected End of process 19-Jan-17 National Grid Distribution n/a Requested Text 10/11/2016 02/11/2016 Y n/a framework and obligations Distribution 20/10/16 Review of Annual Read Meter Reading National Grid No Text req'd - 0564 R 14-Oct-15 Closed Request Distribution Request Closed End of process 16-Jun-16 n/a n/a requirements Distribution Request Panel Moving the NTS Optional Commodity Charge 0563 S SSE 12-Oct-15 Closed Self-Governance NTS CMF Implemented Effective date 12-Feb-16 National Grid NTS n/a Requested Text 12/01/2016 17/12/2015 Y Formula into the UNC 17/12/15 Amendment to the Effective Date of FT - text 0562 FT Modification 0519 ‘Harmonisation of Reference National Grid NTS 02-Oct-15 Closed Fast Track None Implemented Effective date 06-Nov-15 National Grid NTS n/a provided with 15/10/2015 15/10/2015 Y n/a Conditions at Interconnection Points’ mod Amendment to the oxygen limit within the BBL / No Text req'd - 0561 S National Grid NTS 02-Oct-15 Closed Self-Governance Transmission Implemented Effective date 11-Dec-15 n/a n/a n/a NTS Interconnection Agreement enabling Mod Addressing under-allocation of flows from BBL 0560 arising from misalignment of reference GasTerra 30-Sep-15 Closed Urgent Transmission Implemented Effective date 08-Dec-15 National Grid NTS n/a Urgent Mod 10/11/2015 09/11/2015 Y n/a conditions FT - text Correction of a minor legal text reference 0559 FT National Grid NTS 28-Sep-15 Closed Fast Track None Implemented Effective date 06-Nov-15 National Grid NTS n/a provided with 15/10/2015 15/10/2015 Y n/a related to Information Provision changes mod 0558 Standardisation of Industry Payment Terms RWE Npower 04-Sep-15 Closed Modification Distribution Withdrawn End of process 05-Nov-15 Scotia Gas Networks 5 Mod withdrawn n/a Notice Period for Changes to Transportation 0557 Charges resulting from Uncertain costs allowed E.ON UK 04-Sep-15 Closed Modification DN CMF Withdrawn End of process 13-Nov-15 National Grid Distribution 4 Mod withdrawn n/a expenditure - financial adjustments Amendment to the Legal Text provided for FT - text National Grid 0556 FT “Modification 0548 Project Nexus – deferral of 04-Sep-15 Closed Fast Track None Implemented Effective date 09-Oct-15 National Grid Distribution n/a provided with 17/09/2015 17/09/2015 Y n/a Distribution Implementation Date” mod Review of the Market Operator (OCM) Market No Text req'd - 0555 R National Grid NTS 04-Sep-15 Closed Request Request Closed End of process 17-Mar-16 n/a n/a n/a Provisions Operator Request FT - text Scotia Gas 0554 FT Gender-neutral terms within the UNC 26-Aug-15 Closed Fast Track None Implemented Effective date 09-Oct-15 Scotia Gas Networks n/a provided with 17/09/2015 17/09/2015 Y n/a Networks mod Removal of National Grid LNG Storage UNC Panel National Grid LNG 0553 S TPD Section Z obligations and associated 07-Aug-15 Closed Self-Governance Transmission Implemented Effective date 11-Dec-15 National Grid NTS n/a Requested Text 08/10/2015 30/09/2015 Y n/a Storage cross-references 17/09/2015 Panel 0552 S UNC Section Y Housekeeping National Grid NTS 07-Aug-15 Closed Self-Governance None Implemented Effective date 09-Oct-15 National Grid NTS n/a Requested Text 10/09/2015 07/08/2015 Y n/a 20/08/2015 Protecting consumers who are disaggregated Panel 0551 under Modification 0428 from Ratchet charges Gazprom 06-Aug-15 Closed Modification Distribution Rejected End of process 21-Mar-16 Northern Gas Networks 3 Requested Text 08/10/2015 05/10/2015 Y n/a for Winter 2015 17/09/2015 Panel Project Nexus: Incentivising Central Project 0550 RWE Npower 04-Aug-15 Closed Modification Governance Rejected End of process 27-May-16 National Grid Distribution 2 Requested Text 11/02/2016 29/01/2016 Y n/a Delivery 21/01/16 Improving Arrangements for Managing Major 0549 Gazprom 14-Jul-15 Closed Modification Governance Withdrawn End of process 22-0ct-15 Scotia Gas Networks 1 Mod withdrawn n/a Industry Changes Urgent - text Project Nexus – deferral of Implementation National Grid 0548 14-Jul-15 Closed Urgent Nexus Implemented Effective date 14-Aug-15 National Grid Distribution n/a provided with n/a Date Distribution mod Panel Corrections to the EID arising from 0547 S National Grid NTS 03-Jul-15 Closed Self-Governance Transmission Implemented Effective date 09-Oct-15 National Grid NTS n/a Requested Text 06/08/2015 06/08/2015 Y n/a implementation of Modifications 0493/0500 16/07/2015 Panel Reduction of the Minimum Eligible Quantity 0546 S National Grid NTS 03-Jul-15 Closed Self-Governance Transmission Implemented Effective date 09-Oct-15 National Grid NTS n/a Requested Text 06/08/2015 05/08/2015 Y n/a (100,000kWh) for European IP capacity 16/07/2015 Panel Northern Gas 0545 S Changes to GDN MOD186 Publication dates 02-Jul-15 Closed Self-Governance DN CMF Implemented Effective date 06-Nov-15 Northern Gas Networks n/a Requested Text 10/09/2015 18/08/2015 Y n/a Networks 20/08/2015 Amendment to charging under Modification 0544 Gazprom 30-Jun-15 Closed Urgent Distribution Withdrawn End of process 02-Jul-15 National Grid Distribution 8 Mod withdrawn n/a 0428 - Single Meter Supply Points Ex-post removal of uncontrollable UNC charges 0543 at ASEPs which include sub-terminals Gazprom 23-Jun-15 Closed Modification Transmission Renumbered End of process 16-Jul-15 National Grid NTS n/a Mod withdrawn n/a operating on a 06.00 to 06.00 Gas Day

© all rights reserved Page 14 of 19 Printed 06/09/2021 15:09 Joint Office of Gas Transporters http://www.gasgovernance.com/Code/Modifications/

UNC Modification Register *Key Dates are normally an end-date, where shown red this is date sent to Ofgem Modification Reference Suffix: A - Alternate, S - Self Governance, FT - Fast Track Self Governance, V - Varied

Mod Proposing Date Live/ Text Text Modification Title Category Workgroup Current Status Next Stage Key date* Legal Text Provider Text Requested Text Due Std Met ACS Ref Organisation Raised Closed Rotation Delivered

Ex-ante removal of uncontrollable UNC charges 0542 at ASEPs which include sub-terminals BP 23-Jun-15 Closed Modification Transmission Renumbered End of process 16-Jul-15 National Grid NTS n/a Mod withdrawn n/a operating on a 06.00 to 06.00 Gas Day

Ex-post removal of uncontrollable UNC charges Panel 0541 B at ASEPs which include sub-terminals Gazprom 16-Jul-15 Closed Modification Transmission Rejected End of process 26-May-16 National Grid NTS n/a Requested Text 11/02/2016 11/02/2016 Y n/a operating on a 06.00 to 06.00 Gas Day 21/01/16

Ex-ante removal of uncontrollable UNC charges Panel 0541 A at ASEPs which include sub-terminals BP 16-Jul-15 Closed Modification Transmission Rejected End of process 26-May-16 National Grid NTS n/a Requested Text 11/02/2016 11/02/2016 Y n/a operating on a 06.00 to 06.00 Gas Day 21/01/16 Removal of uncontrollable UNC charges at ASEPs which include sub-terminals operating 0541 EDF Trading 23-Jun-15 Closed Modification Transmission Withdrawn End of process 15-Dec-15 National Grid NTS n/a Mod withdrawn n/a on a 06.00 to 06.00 Gas Day via an ex-ante, quantity adjustment FT - text Scotia Gas 0540 FT Amendment to TPD Section G2.15 10-Jun-15 Closed Fast Track Distribution Implemented Effective date 07-Aug-15 Scotia Gas Networks n/a provided with 16/07/2015 16/07/2015 Y n/a Networks mod Deemed Text Removal of NTS Exit Commodity Charges for 0539 Barrow Shipping Ltd 05-Jun-15 Closed Modification DN CMF Rejected End of process 19-Nov-15 Scotia Gas Networks 5 Request 17/09/2015 17/09/2015 Y n/a Distributed Gas 17/09/15 FT - text Correcting legal text errors – gas Security of 0538 FT National Grid NTS 04-Jun-15 Closed Fast Track Transmission Implemented Effective date 01-Oct-15 National Grid NTS n/a provided with 18/06/2015 18/06/2015 Y n/a Supply Significant Code Review mod Change of Project Nexus Implementation Date Total Gas and 0537 27-Apr-15 Closed Modification Nexus Withdrawn End of process 18-Jun-15 National Grid Distribution n/a Mod withdrawn n/a to 1st April 2016 Power Project Nexus – deferral of implementation of National Grid 0536 elements of Retrospective Adjustment 24-Apr-15 Closed Modification Nexus Withdrawn End of process 24-Jul-15 National Grid Distribution n/a Mod withdrawn n/a Distribution arrangements Implementation of Non-Effective Days to Panel Scotia Gas 0535 enable Annual AQ Review (independent of 06-Mar-15 Closed Modification Nexus Implemented Effective date 24-Jul-15 Scotia Gas Networks n/a Requested Text 07/05/2015 07/05/2015 Y TBC Networks Nexus transition) 16/04/2015 Maintaining the Efficacy of the NTS Optional Panel 0534 Commodity ('shorthaul') Tariff at Bacton Entry Gazprom 06-Mar-15 Closed Modification Transmission Implemented Effective date 01-Aug-16 National Grid NTS n/a Requested Text 06/08/2015 23/07/2015 Y TBC Points 16/07/2015 Corrections to Network Entry Provisions in the No Text req'd - 0533 S National Grid NTS-BBL Interconnection National Grid NTS 06-Mar-15 Closed Self-Governance Transmission Implemented Effective date 15-Jun-15 National Grid NTS n/a n/a enabling Mod Agreement Panel Implementation of Non-Effective Days (Project National Grid 0532 06-Mar-15 Closed Modification Nexus Rejected End of process 30-Jun-16 National Grid Distribution n/a Requested Text 10/12/2015 03/12/2015 Y n/a Nexus transitional modification) Distribution 19/11/2015 Panel 0531 Provision of an Industry User Test System SSE 09-Feb-15 Closed Modification Nexus Rejected End of process 20-Oct-16 National Grid Distribution 4 Requested Text 13/05/2016 06/05/2016 Y n/a 21/04/2016 Use of Supply Point Register data for Project National Grid 0530 06-Feb-15 Closed Modification Nexus Withdrawn End of process 18-Feb-15 National Grid Distribution n/a Mod withdrawn n/a Nexus 'Market Trials' Testing Phase Distribution Implementation of Retrospective Adjustment Panel National Grid 0529 arrangements (Project Nexus transitional 06-Feb-15 Closed Modification Nexus Rejected End of process 10-Feb-16 National Grid Distribution n/a Requested Text 11/06/2015 21/05/2015 Y n/a Distribution modification) 21/05/15 Implementation of Supply Point Administration, Panel National Grid 0528 V gas allocation and settlement arrangements 20-Aug-15 Closed Modification Nexus Implemented Effective date 11-Feb-16 National Grid Distribution n/a Requested Text 07/05/2015 16/04/2015 Y n/a Distribution (Project Nexus transitional modification) 16/04/2015

Implementation of Supply Point Administration, Panel National Grid 0528 gas allocation and settlement arrangements 06-Feb-15 Closed Modification Nexus Withdrawn End of process 20-Aug-15 National Grid Distribution n/a Requested Text 07/05/2015 16/04/2015 Y n/a Distribution (Project Nexus transitional modification) 16/04/2015 Implementation of Annual Quantity Panel National Grid 0527 arrangements (Project Nexus transitional 06-Feb-15 Closed Modification Nexus Implemented Effective date 11-Feb-16 National Grid Distribution n/a Requested Text 07/05/2015 16/04/2015 Y n/a Distribution modification) 16/04/2015 Panel Identification of Supply Meter Point pressure 0526 S E.ON UK 06-Feb-15 Closed Self-Governance Distribution Rejected End of process 16-Jun-16 Northern Gas Networks 3 Requested Text 13/05/2016 13/05/2016 Y n/a tier 21/04/2016 Panel Enabling EU Compliant Interconnection 0525 National Grid NTS 04-Feb-15 Closed Modification European Implemented Effective date 01-Oct-15 National Grid NTS n/a Requested Text 12/06/15 04/06/2015 Y n/a Agreements 21/05/15 Enabling the Use of Pre Nexus Meter Reads for 0524 the purposes of Post Nexus Rolling AQ Gazprom 23-Jan-15 Closed Modification Nexus Withdrawn End of process 11-Feb-15 National Grid Distribution n/a Mod withdrawn n/a Calculation Supply Point Registration – Facilitation of Panel National Grid Nexus Imp 0523 S ‘faster switching’ for Shared Supply Meter 07-Jan-15 Closed Self-Governance Distribution Implemented Effective date National Grid Distribution n/a Requested Text 12/06/15 21/05/2015 Y n/a Distribution Date Points 21/05/15 Panel Governance of the use of email as a valid UNC 0522 S E.ON UK 08-Aug-14 Closed Self-Governance Distribution Rejected End of process 17-Dec-15 Northern Gas Networks n/a Requested Text 10/12/15 18/11/2015 Y n/a communication 19/11/15 Revision of User Admission Criteria to include Panel requested 0521 Transporter verification of its ability to transact National Grid NTS 10-Dec-14 Closed Modification NTS CMF Rejected End of process 11-May-15 National Grid NTS n/a 14/01/15 18/12/2014 Y n/a text 18/12/14 with the Applicant User

© all rights reserved Page 15 of 19 Printed 06/09/2021 15:09 Joint Office of Gas Transporters http://www.gasgovernance.com/Code/Modifications/

UNC Modification Register *Key Dates are normally an end-date, where shown red this is date sent to Ofgem Modification Reference Suffix: A - Alternate, S - Self Governance, FT - Fast Track Self Governance, V - Varied

Mod Proposing Date Live/ Text Text Modification Title Category Workgroup Current Status Next Stage Key date* Legal Text Provider Text Requested Text Due Std Met ACS Ref Organisation Raised Closed Rotation Delivered

Panel 0520 A Performance Assurance Reporting E.ON UK 02-Oct-15 Closed Modification Distribution Implemented Effective date 01-Jan-17 Wales & West Utilities n/a Requested Text 10/12/2015 08/12/2015 Y TBC 19/11/2015 Panel requested 0520 Performance Assurance Reporting British Gas 25-Nov-14 Closed Modification Distribution Rejected End of process 25-Apr-16 Wales & West Utilities n/a 10/09/15 04/09/2015 Y TBC Text 20/08/15 Panel Harmonisation of Reference Conditions at 0519 National Grid NTS 07-Nov-14 Closed Modification European Implemented Effective date 01-Oct-15 National Grid NTS n/a Requested Text 05/02/15 16/01/15 Y n/a Interconnection Points 15/01/15 Panel Shipper Verification of meter and address Scotia Gas 0518 S 31-Oct-14 Closed Self-Governance Distribution Implemented Effective date 01-Sep-17 Scotia Gas Networks n/a Requested Text 12/06/15 21/05/15 Y n/a details following system meter removals. Networks 21/05/15 Review of the Supply Matching Merit Order in Deemed Text 0517 B Setting Capacity Charges, Rolling Average to SSE 16-Dec-14 Closed Modification NTS CMF Rejected End of process 25-Sep-15 National Grid NTS n/a Request 09/07/15 18/06/15 Y n/a Reduce Volatility in Annual Charges 18/06/15 Review of the Supply Matching Merit Order in Wales & West Panel requested 0517 A Setting Capacity Charges and Timing of 11-Dec-14 Closed Modification NTS CMF Rejected End of process 25-Sep-15 National Grid NTS n/a 14/01/15 06/01/15 Y n/a Utilities text 18/12/14 Resultant Price Changes Review of the Supply Matching Merit Order in Panel requested 0517 National Grid NTS 03-Oct-14 Closed Modification NTS CMF Rejected End of process 25-Sep-15 National Grid NTS n/a 14/01/15 06/01/15 Y n/a Setting Capacity Charges text 18/12/14

Information provision by large Customers to aid Nexus Imp Panel requested 0516 S Wingas 16-Sep-14 Closed Self-Governance Distribution Implemented Effective date Scotia Gas Networks n/a 12/03/15 19/02/15 Y n/a understanding of site characteristics Date text 19/02/15 Resolution timescales for SRVs and USRVs Panel National Grid 0515 S 27-Aug-14 Closed Self-Governance Nexus Implemented Effective date 13-Mar-15 National Grid Distribution n/a Requested Text 11/12/14 04/12/14 Y n/a Distribution following Project Nexus Implementation 20/11/14 Extending the Daily Metered ‘voluntary’ service Panel National Grid Nexus Imp 0514 to Project Nexus Implementation Date plus six 27-Aug-14 Closed Modification Nexus Implemented Effective date National Grid Distribution n/a Requested Text 20/11/14 20/11/14 Y n/a Distribution Date months 20/11/14 UK Link Programme (Project Nexus) - National Grid 0513 20-Aug-14 Closed Urgent Nexus Implemented Effective date 27-Oct-15 National Grid Distribution n/a None Required Yes independent project assurance for Users Distribution Amendment to Section M to be consistent with Panel requested 0512 S British Gas 20-Aug-14 Closed Self-Governance Distribution Implemented Effective date 13-Mar-15 National Grid Distribution 2 14/01/15 18/12/14 Y n/a Faster Switching proposals text 18/12/14 Introduction of an Enduring Solution for 0511 managing Advanced Meters in central systems Gazprom 18-Aug-14 Closed Modification Nexus Withdrawn End of process 23-Jan-15 Northern Gas Networks n/a Mod withdrawn n/a post Nexus Panel Reform of Gas Allocation Regime at GB 0510 V National Grid NTS 16-Jul-15 Closed Modification European Implemented Effective date 01-Oct-15 National Grid NTS n/a Requested Text 06/08/15 16/07/15 Y n/a Interconnection Points 16/07/15 Panel Reform of Gas Allocation Regime at GB 0510 National Grid NTS 08-Aug-14 Closed Modification European Withdrawn End of process 16-Jul-15 National Grid NTS n/a Requested Text 05/02/15 19/01/15 Y n/a Interconnection Points 15/01/15 Permission to release Protected Information to 0509 an Authorised Third Party for Performance E.ON UK 08-Aug-14 Closed Modification Governance Withdrawn End of process 24-Jun-15 Scotia Gas Networks 1 Mod withdrawn n/a Assurance settlement risk analysis DN Charging Revised Distributed Gas Charging National Grid 0508 04-Jul-14 Closed Modification Methodology Withdrawn End of process 24-Oct-14 National Grid Distribution n/a Mod withdrawn n/a Arrangements Distribution Forum Panel 0507 Changing The Effective Date of 0451AV Winchester Gas 01-Jul-14 Closed Modification Distribution Implemented Effective date 01-Nov-14 National Grid Distribution 8 Requested Text 11/09/14 21/08/14 Y n/a 21/08/13 Panel Gas Performance Assurance Framework and Performance 0506 AV SSE 19-Nov-15 Closed Modification Rejected End of process 17-Dec-15 Wales & West Utilities n/a Requested Text 10/12/15 19/11/15 Y n/a Governance Arrangements Assurance 19/11/15 Panel Gas Performance Assurance Framework and Performance 0506 A SSE 02-Jan-15 Closed Modification Withdrawn End of process 19-Nov-15 Wales & West Utilities n/a Requested Text 09/07/15 30/06/15 Y n/a Governance Arrangements Assurance 18/06/15 Panel Gas Performance Assurance Framework and Performance 0506 V Scottish Power 19-Nov-15 Closed Modification Implemented Effective date 29-Jan-16 Wales & West Utilities 7 Requested Text 10/12/15 19/11/15 Y n/a Governance Arrangements Assurance 19/11/15 Panel Gas Performance Assurance Framework and Performance 0506 Scottish Power 12-Jun-14 Closed Modification Withdrawn End of process 19-Nov-15 Wales & West Utilities 7 Requested Text 09/07/15 30/06/15 Y n/a Governance Arrangements Assurance 18/06/15 Update to UNC TPD Section G & M to correct Scotia Gas 0505 S anomalies arising from the implementation of 06-Jun-14 Closed Self-Governance Distribution Withdrawn End of process 22-Oct-14 Scotia Gas Networks n/a Mod withdrawn 10/07/14 30/06/14 n/a Networks UNC Modification 0463S Panel Demand Side Response (DSR) Methodology Demand Side 0504 National Grid NTS 04-Jun-14 Closed Modification Implemented Effective date 01-Mar-16 National Grid NTS n/a Requested Text 10/12/15 19/11/15 Y n/a Implementation Response 19/11/15 FT Mod - Text Update of Transporter Procedure Document (Proposed as FT - Text 0503 FT E.ON UK 02-Jun-14 Closed Fast Track Distribution Implemented Effective date 08-Aug-14 n/a provided with 18/07/14 18/07/14 Y n/a references within Network Code included) the Mod Amendment to Gas Quality NTS Entry No Text req'd - 0502 Specification at the px Teesside System Entry Energy24 Limited 01-May-14 Closed Modification Transmission Implemented Effective date 28-Sep-15 National Grid NTS n/a n/a enabling Mod Point

© all rights reserved Page 16 of 19 Printed 06/09/2021 15:09 Joint Office of Gas Transporters http://www.gasgovernance.com/Code/Modifications/

UNC Modification Register *Key Dates are normally an end-date, where shown red this is date sent to Ofgem Modification Reference Suffix: A - Alternate, S - Self Governance, FT - Fast Track Self Governance, V - Varied

Mod Proposing Date Live/ Text Text Modification Title Category Workgroup Current Status Next Stage Key date* Legal Text Provider Text Requested Text Due Std Met ACS Ref Organisation Raised Closed Rotation Delivered

Treatment of Existing Entry Capacity Rights at the Bacton ASEP to comply with EU Capacity Panel requested 0501 CV Eni 01-May-15 Closed Modification European Rejected End of process 20-Jul-15 National Grid NTS n/a 14/01/15 14/01/15 Y n/a Regulations, including a capped capacity text 18/12/14 return option and an aggregate overrun regime.

Treatment of Existing Entry Capacity Rights at Panel the Bacton ASEP to comply with EU Capacity 0501 C Eni 07-Nov-14 Closed Modification European Withdrawn End of process 01-May-15 National Grid NTS n/a Requested Text 06/11/14 17/10/14 Y Yes Regulations, including a capped capacity 16/10/14 return option and an aggregate overrun regime. Treatment of Existing Entry Capacity Rights at Panel the Bacton ASEP to comply with EU Capacity 0501 BV Centrica Storage 01-May-15 Closed Modification European Rejected End of process 20-Jul-15 National Grid NTS n/a Requested Text 09/10/14 02/10/14 Y n/a Regulations, including a restricted capacity 18/09/14 return option. Treatment of Existing Entry Capacity Rights at Panel the Bacton ASEP to comply with EU Capacity 0501 B Centrica Storage 10-Oct-14 Closed Modification European Withdrawn End of process 01-May-15 National Grid NTS n/a Requested Text 09/10/14 02/10/14 Y n/a Regulations, including a restricted capacity 18/09/14 return option. Treatment of Existing Entry Capacity Rights at Panel 0501 AV the Bacton ASEP to comply with EU Capacity Centrica Energy 01-May-15 Closed Modification European Rejected End of process 20-Jul-15 National Grid NTS n/a Requested Text 09/10/14 02/10/14 Y n/a Regulations, including capacity return option. 18/09/14

Treatment of Existing Entry Capacity Rights at Panel 0501 A the Bacton ASEP to comply with EU Capacity Centrica Energy 23-Jul-14 Closed Modification European Withdrawn End of process 01-May-15 National Grid NTS n/a Requested Text 09/10/14 02/10/14 Y n/a Regulations, including capacity return option. 18/09/14 Treatment of Existing Entry Capacity Rights at Panel 0501 V the Bacton ASEP to comply with EU Capacity National Grid NTS 01-May-15 Closed Modification European Implemented Effective date 21-Jul-15 National Grid NTS n/a Requested Text 09/10/14 02/10/14 Y n/a Regulations 18/09/14 Treatment of Existing Entry Capacity Rights at Panel 0501 the Bacton ASEP to comply with EU Capacity National Grid NTS 01-May-14 Closed Modification European Withdrawn End of process 01-May-15 National Grid NTS n/a Requested Text 09/10/14 02/10/14 Y n/a Regulations 18/09/14 EU Capacity Regulations – Capacity Allocation Panel 0500 Mechanisms with Congestion Management National Grid NTS 01-May-14 Closed Modification European Implemented Effective date 19-Jun-15 National Grid NTS n/a Requested Text 09/10/14 02/10/14 Y n/a Procedures 18/09/14 FT - text National Grid 0499 FT Amendment to TPD Section G1.6.13(e)(iv) 10-Apr-14 Closed Fast Track Distribution Implemented Effective date 01-Oct-14 National Grid Distribution n/a provided with 18/09/2014 18/09/2014 Y n/a Distribution mod Amendment to Gas Quality NTS Entry No Text req'd - 0498 BP Gas Marketing 04-Apr-14 Closed Modification Transmission Implemented Effective date 28-Sep-15 National Grid NTS n/a n/a Specification at BP Teesside System Entry enabling Mod Panel Removal of the CSEP NExA table held within 0497 RWE Npower 04-Apr-14 Closed Modification Distribution Implemented Effective date 27-Feb-15 National Grid Distribution 6 Requested Text 11/09/14 21/08/14 Y n/a Annex A part 8 21/08/13 FT - text Reinstatement of Calendar Days as a measure Scotia Gas 0496 FT 04-Apr-14 Closed Fast Track Governance Implemented Effective date 14-May-14 Scotia Gas Networks n/a provided with 17/04/2014 17/04/2014 Y n/a in Section G2.5.8(b) Networks mod 0495 Introduction of a Change Board for the UNC E.ON UK 04-Apr-14 Closed Modification Governance Withdrawn End of process 04-Nov-14 Scotia Gas Networks 5 Mod withdrawn n/a Imbalance Charge amendments required to Panel requested 0494 align the UNC with the Network Code on Gas National Grid NTS 04-Apr-14 Closed Modification European Implemented Effective date 01-Oct-15 National Grid NTS n/a 10/07/14 19/06/14 Y n/a Text 19/06/14 Balancing of Transmission Networks Panel EU Gas Balancing Code - Daily Nominations at 0493 National Grid NTS 04-Apr-14 Closed Modification European Implemented Effective date 19-Jun-15 National Grid NTS n/a Requested Text 09/10/14 19/09/14 Y n/a Interconnection Points (IP) 18/09/14 Governance change - update to Mod Rules FT - text 0492 FT following Consumers' Representative's name National Grid NTS 04-Apr-14 Closed Fast Track Governance Implemented Effective date 09-Jun-14 National Grid NTS n/a provided with 09/06/14 15/05/14 Y n/a change mod Sugg Text was Change Implementation Date of Project Nexus confirmed as 0491 National Grid NTS 10-Mar-14 Closed Modification Distribution Rejected End of process 16-May-14 National Grid NTS n/a 01/04/14 11/03/14 Y n/a to 1st April 2016 formal Text at Panel 11/03/14 Updates to UNC TPD Section B to correct FT - text anomalies arising from the implementation of 0490 S National Grid NTS 07-Mar-14 Closed Self-Governance Transmission Implemented Effective date 14-May-14 National Grid NTS n/a provided with 15/05/2014 15/05/2014 Y n/a UNC Modification 0376S “Increased Choice mod when Applying for NTS Exit Capacity EU Gas Balancing Code - Information Panel requested 0489 Provision changes required to align the UNC National Grid NTS 07-Mar-14 Closed Modification European Implemented Effective date 01-Oct-15 National Grid NTS n/a 10/07/14 19/06/14 Y n/a Text 19/06/14 with the EU Code Panel requested 0488 S Additional Changes to the Mod 81 Reports Scottish Power 07-Mar-14 Closed Self-Governance Distribution Implemented Effective date 01-Jul-14 National Grid Distribution 4 09/06/14 15/05/14 Y n/a text 15/05/14

Panel requested Introduction of an Advanced Meter Reader text 17/07/14, 0487 V (AMR) Service Provider (ASP) Identifier (ASP Gazprom 16-Oct-14 Closed Self-Governance Distribution Implemented Effective date 01-Apr-15 Northern Gas Networks 3 05/09/14 05/09/14 Y Yes NGN 'stop' note ID) and Advanced Meter Indicator 12/08/14

© all rights reserved Page 17 of 19 Printed 06/09/2021 15:09 Joint Office of Gas Transporters http://www.gasgovernance.com/Code/Modifications/

UNC Modification Register *Key Dates are normally an end-date, where shown red this is date sent to Ofgem Modification Reference Suffix: A - Alternate, S - Self Governance, FT - Fast Track Self Governance, V - Varied

Mod Proposing Date Live/ Text Text Modification Title Category Workgroup Current Status Next Stage Key date* Legal Text Provider Text Requested Text Due Std Met ACS Ref Organisation Raised Closed Rotation Delivered

Introduction of Advanced Meter Indicator and Panel requested Advanced Meter Reader (AMR) Service text 17/07/14, 0487 S Gazprom 05-Mar-14 Closed Self-Governance Distribution Withdrawn End of process 16-Oct-14 Northern Gas Networks 3 05/09/14 05/09/14 Y n/a Provider Identifier in advance of Project Nexus NGN 'stop' note Go Live 12/08/14 0486 Use of the Pre-Payment Profile For IGTs Winchester Gas 25-Feb-14 Closed Modification Distribution Withdrawn End of process 04-Jul-14 National Grid Distribution 2 Withdrawn n/a Introduction of the Long-term use-it-or-lose-it Panel requested 0485 mechanism to facilitate compliance with the EU National Grid NTS 07-Feb-14 Closed Modification European Implemented Effective date 30-Sep-14 National Grid NTS n/a 05/06/14 30/05/14 Y n/a text 15/05/14 Congestion Management Procedures Panel requested 0484 S Guidance for the production of legal text Gazprom 07-Feb-14 Closed Self-Governance Governance Implemented Effective date 11-Jul-14 Scotia Gas Networks 1 14/03/2014 14/03/14 Y n/a text 20/02/14

Performance Assurance Framework Incentive Performance National Grid Distribution 0483 British Gas 07-Feb-14 Closed Modification Withdrawn End of process 06-Mar-15 8 Mod withdrawn n/a Regime Assurance transferred to WWU

Proposed Changes to Mod 81 Reports to be Panel requested 0482 S Scottish Power 06-Feb-14 Closed Self-Governance Distribution Implemented Effective date 01-Jul-14 Wales & West Utilities 7 13/03/14 30/04/14 N n/a effective from 01/7/14 text 20/02/14

Amendment to AQ Values Present Within 04/02/14 CW 0481 Annex A of the CSEP NExA AQ Table SSE 03-Feb-14 Closed Modification Distribution Implemented Effective date 01-Oct-14 National Grid Distribution confirmed none n/a Following the 2013 AQ Review required for UNC FT - text Northern Gas 0480 FT Minor update to UNC General Terms Section B 27-Jan-14 Closed Fast Track Distribution Implemented Effective date 14-Mar-14 Northern Gas Networks provided with 14/03/2014 14/03/2014 Y n/a Networks mod Panel Inclusion of email as a valid UNC Northern Gas 0479 S 27-Jan-14 Closed Self-Governance Distribution Implemented Effective date 13-Mar-15 Northern Gas Networks Requested Text 11/12/14 02/12/14 Y n/a communication’ Networks 20/11/14 Sugg Text was Filling the gap for SOQ reductions below Northern Gas confirmed as 0478 27-Jan-14 Closed Modification Distribution Implemented Effective date 01-Oct-14 Northern Gas Networks n/a BSSOQ until Project Nexus Networks formal Text at Panel 20/02/14 Supply Point Registration - Facilitation of Panel requested 0477 British Gas 03-Jan-14 Closed Modification Distribution Implemented Effective date 07-Nov-14 Scotia Gas Networks Yes Faster Switching text 20/02/14 Sugg Text was DN Charging Alignment of DN Charging Methodology with National Grid confirmed as 0476 S 30-Dec-13 Closed Self-Governance Methodolgy Implemented Effective date 01-Apr-14 National Grid Distribution n/a RIIO-GD1 Arrangements Distribution formal Text at Forum Panel 16/01/13 Update to Section G, Annex G3 (Prospective Panel requested 0475 S Scottish Power 23-Dec-13 Closed Self-Governance Distribution Implemented Effective date 11-Jul-14 National Grid Distribution 09/06/14 08/04/14 Y n/a Erroneous Large AQ Calculation Proforma) text 15/05/14

Inclusion of the guidelines relating to the "Customer Settlement Error Claims Process" National Grid Panel requested 0474 S 10-Dec-13 Closed Self-Governance Distribution Implemented Effective date 09-Jun-14 National Grid Distribution Yes within UNC governance and introduction of the Distribution text 19/12/13 User Pays charges associated with such claims

Panel requested 0473 A Project Nexus – Allocation of Unidentified Gas British Gas 01-May-14 Closed Modification Nexus Rejected End of process 20-Nov-14 Northern Gas Networks 06/11/14 12/11/14 N Yes text 16/10/14

Nexus Imp Panel requested 0473 Project Nexus – Allocation of Unidentified Gas Gazprom 18-Nov-13 Closed Modification Nexus Implemented Effective date Northern Gas Networks 13/05/14 14/05/14 N Yes Date text 17/04/14

Reporting the number of registration attempts Panel requested 0472 S RWE Npower 11-Nov-13 Closed Self-Governance Distribution Implemented Effective date 15-Sep-14 National Grid Distribution 10/07/14 08/07/14 Y n/a by a Gas Shipper text 19/06/2014

Amending the start time that a Day-ahead Panel requested 0471 S EDF Energy 08-Nov-13 Closed Self-Governance Transmission Implemented Effective date 29-Apr-14 National Grid NTS Yes Market Offer can be accepted text 21/11/13 Notification of Minimal Safety operating gas Withdrawn 0470 Wingas 04-Oct-13 Closed Modification Distribution Withdrawn End of process 16-Sep-14 Scotia Gas Networks n/a needs of large customers 16/09/14 Panel requested 0469 S Transporter Gas Safety Visit Reporting British Gas 04-Oct-13 Closed Self-Governance Distribution Implemented Effective date 14-Jan-15 National Grid Distribution 06/11/14 22/10/14 Y n/a text 16/10/14 Unique Property Reference Number (UPRN) Withdrawn 0468 E.ON UK 01-Oct-13 Closed Modification Distribution Withdrawn End of process 21-Dec-15 National Grid Distribution n/a Population by Gas Transporters 21/12/15 Project Nexus - iGT Single Service Provision; National Grid Panel requested 0467 01-Oct-13 Closed Modification Nexus Implemented Effective date 16-Jan-15 National Grid Distribution 07/11/13 04/02/14 N n/a data preparation Distribution text 17/10/13 (Panel Requested Text Daily Meter Reading Simplification with for 0466A 0466 AV Wingas 23-Jun-14 Closed Modification Distribution Implemented Effective date 01-Apr-16 National Grid Distribution 09/10/14 26/08/14 Y n/a improved within day data provision 18/09/14 - Mod withdrawn/replac ed by 0466AV) Panel Daily Meter Reading Simplification with 0466 A Wingas 23-Jun-14 Closed Modification Distribution Withdrawn End of process 19-Feb-15 National Grid Distribution Requested Text 09/10/14 26/08/14 Y Yes improved within day data provision 18/09/14

© all rights reserved Page 18 of 19 Printed 06/09/2021 15:09 Joint Office of Gas Transporters http://www.gasgovernance.com/Code/Modifications/

UNC Modification Register *Key Dates are normally an end-date, where shown red this is date sent to Ofgem Modification Reference Suffix: A - Alternate, S - Self Governance, FT - Fast Track Self Governance, V - Varied

Mod Proposing Date Live/ Text Text Modification Title Category Workgroup Current Status Next Stage Key date* Legal Text Provider Text Requested Text Due Std Met ACS Ref Organisation Raised Closed Rotation Delivered

National Grid Panel requested 0466 Daily Meter Reading Simplification 01-Oct-13 Closed Modification Distribution Rejected End of process 26-Mar-15 National Grid Distribution 05/06/14 19/05/14 Y n/a Distribution text 15/05/14 Introduction of the Planning and Advanced Sugg Text was Reservation of Capacity Agreement (PARCA), confirmed as 0465 V SSE 27-Sep-13 Closed Modification Transmission Implemented Effective date 02-Feb-15 National Grid NTS n/a Weighted Average PARCA Security formal Text at Panel 17/10/13 Alternative LNG supply to the Scottish Text was Independent Networks (SINs) Scotia Gas confirmed as 0464 06-Sep-13 Closed Urgent Distribution Implemented Effective date 31-Oct-13 Scotia Gas Networks n/a Networks formal Text at Panel 17/10/13 Recognition of the ‘2nd January’ Scottish Bank Panel requested 0463 S Holiday as a Business Day for Supply Point SSE 02-Aug-13 Closed Self-Governance Distribution Implemented Effective date 14-Mar-14 Scotia Gas Networks n/a text 21/11/13 related transactions Introducing Fast Track Self Governance into Scotia Gas Panel requested 0462 the Uniform Network Code 01-Aug-13 Closed Modification Governance Implemented Effective date 31-Dec-13 Scotia Gas Networks n/a Networks text 21/11/13 Changing the UNC Gas Day to Align with the Panel requested 0461 Gas Day in EU Network Codes National Grid NTS 07-Jun-13 Closed Modification Transmission Implemented Effective date 01-Oct-15 National Grid NTS n/a text 21/11/13 Alignment of capacity and revenue treatment NTS Charging 0460 S within the NTS Charging Methodology with National Grid NTS 07-Jun-13 Closed Self-Governance Methodology Implemented Effective date 11-Oct-13 National Grid NTS 20/06/2013 n/a RIIO-T1 arrangements Forum NTS Charging Amendments to the 'K' revenue adjustment 0459 S National Grid NTS 07-Jun-13 Closed Self-Governance Methodology Implemented Effective date 09-Sep-13 National Grid NTS 20/06/2013 n/a factor based on RIIO-T1 Forum Scotia Gas Panel requested 0458 Seasonal LDZ System Capacity 07-Jun-13 Closed Modification Distribution Implemented Effective date 28-Feb-15 Scotia Gas Networks n/a Networks text 21/11/13 Rights. Extending the use of the UK Link Network National Grid 0457 S (Information Exchange (IX)) to Meter Asset 04-Jun-13 Closed Self-Governance Distribution Implemented Effective date 13-Dec-13 National Grid Distribution 19/09/2013 n/a Distribution Provider (MAP) organisations Revision to the treatment of Allocation of 03/06/13 0456 British Gas 24-May-13 Closed Urgent Distribution Rejected End of process 28-Jun-13 National Grid Distribution n/a Unidentified Gas for the 2013/14 AUG Year (Ofgem) Updating of Meter Information by the National Grid Panel requested 0455 21-May-13 Closed Modification Distribution Implemented Effective date 27-May-14 National Grid Distribution Yes Transporter Distribution text 21/11/13 Introduction of a Long Term Non Firm Capacity 0454 National Grid NTS 02-May-13 Closed Modification Transmission Rejected End of process 20-Jun-14 National Grid NTS 19/09/2013 Yes Product 19/09/2013 National Grid 0453 Project Nexus - Demand Estimation 23-Apr-13 Closed Modification Nexus Withdrawn End of process 18-Oct-13 National Grid Distribution (mod withdrawn n/a Distribution 18/10/13) Sugg Text was Introduction of the Planning and Advanced confirmed as 0452 V National Grid NTS 05-Apr-13 Closed Modification Transmission Rejected End of process 05-Dec-14 National Grid NTS n/a Reservation of Capacity Agreement (PARCA) formal Text at Panel 17/10/13 Individual Settlements For Pre-Payment & 18/07/2013 Smart Meters (0451A); 0451 AV E.ON UK 04-Jul-13 Closed Modification Distribution Implemented Effective date 01-Feb-14 Northern Gas Networks 0451AV n/a provided 22/12/13 Individual Settlements For Pre-Payment & 20/06/2013(045 Smart Meters 1); revised text 0451 V Winchester Gas 27-Mar-13 Closed Urgent Distribution Rejected End of process 31-Jan-14 Northern Gas Networks Yes for 0451V 10/01/14

© all rights reserved Page 19 of 19 Printed 06/09/2021 15:09