NI Network Code
The governing framework for gas transportation across Northern Ireland’s transmission network.
NI Network Transmission Code
Shippers transporting gas through the NI Transmission System must accede to the NI Network Gas Transmission Code (the Code), approved by the Northern Ireland Authority for Utility Regulation (NIAUR).
The Code sets out the framework for how the system operates, including the roles and obligations of Shippers and Transmission System Operators (TSOs). It covers key processes such as capacity booking, nominations, balancing, allocation, metering, and settlement.
It provides a transparent and consistent basis for accessing and using the NI Transmission System.
Code Modifications
The Code is maintained and updated periodically to reflect regulatory, market, and operational changes.
Under their Gas Conveyance Licences, TSOs are required to work jointly with other high-pressure Gas Conveyance Licensees to establish and maintain a process for modifying the Code.
This process enables Shippers and other stakeholders to raise modification proposals. Proposals are subject to industry consultation and must be approved by NIAUR prior to implementation.
Full details of the modification process are set out in the Code Modification Rules.
Approved Modifications
- No 1 Introduction of a Capacity Conversion Service
- No 2 Amendment of Timescales for the Shipper Forecast Information Request
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No 3 Credit Section Update Proposed Modification No 1 Consultation Response (AES) Proposed Modification No 3 Legal Text Mark Up Proposed Modification No 3 Consultation Response (ESB) Proposed Modification No 3 Consultation Response (fe) Proposed Modification No 3 Consultation Response (PNGL) Final Modification Report No 3 Credit Section Update Modification No 3 Final Legal Text Modification No 3 Approval Letter
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No 4 Code Housekeeping Update Proposed Modification No 4 Code Housekeeping Update Proposed Modification No 4 Code Housekeeping Update Legal Text Mark Up Proposed Modification No 4 Consultation Response (AES) Final Modification Report No 4 - Code Housekeeping Update Modification No 4 Legal Text Mark Up Modification No 4 Approval Letter
- No 5 Extension to the West Transmission System
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No 7 South Section Proposed Modification No 7 South Section Code Modification Rules - Application for Change No 1 Final Modification Report No 7 South Section Code Modifications Rules - Application for Change No 1 Consultation Report Modification No 7 Approval Letter Code Modification Rules - Application for Change No 1 Approval Letter
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No 8 Tolerance and Reallocation Changes Proposed Modification No 8 Tolerance and Reallocation Changes Proposed Modification No 8 Consultation Response (ESB) Proposed Modification No 8 Consultation Response (feDL) Proposed Modification No 8 Consultation Response (feSL) Proposed Modification No 8 Consultation Response (PNGL) Proposed Modification No 8 Consultation Response (PPB) Final Modification Report No 8 Tolerance and Reallocation Changes Modification No 8 Approval Letter
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No 9 Non-IP Entry Point and Stranraer Arrangements No 9 Non-IP Entry Point and Stranraer Arrangements Proposed Modification No 9 Consolation Response (ESB) Proposed Modification No 9 Consolation Response (SGN) OS Scheme and CMP Methodology Statement Approved Version OS Scheme and CMP Methodology Statement Approval Letter Final Modification Report NO 9 Non-IP Entry Point and Stranrear Arrangements Modification NO 9 Approval Letter
- No 10 Arrangements for the ROI System Exit Point
- No 11 Small Adjustment and Tolerance Reductions
- No 12 Brexit Modifications
- No 13 Amendment of Ten Year Statement submission Date
- No 14 Replacement of LIBOR
- No 15 Introduction of Aggregate Balancing
- No 16 Introduction of Kilroot Exit Point, provisions for Network Agreements and associated changes
- No 18 Introduction of Entry Point Switching Agreement and minor 'housekeeping' changes
- No 19 Housekeeping and Credit Updates Modification
- No 20 Introduction of the Carrakeel Exit Point
- No 21 Update to the Gas Specification
- No 22 Introduction of Monthly Credit Monitoring Processes
Withdrawn / Rejected Modifications
- No 6 Brexit Modifications
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No 17 Introduction of mechanism to enable booking of Exit Capacity for Commissioning Proposed Modification No 17 Exit Capacity for Commissioning Initial Modification Report No 17 Introduction of Mechanism to enable booking of Exit Capacity for Commissioning Proposed Modification No 17 Consultation Response (Energia) Proposed Modification No 17 Consultation Response (EPUKI) Proposed Modification No 17 Consultation Response (Phoenix) Final Modification Report No 17 Introduction of Mechanism to enable booking of Exit Capacity for Commissioning Modification No 17 Rejection Letter
Business Rules
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Virtual Reverse Flow Consultation Update To The Virtual Reverse Flow Product And Tariff Methodology Consultation Update To The Virtual Reverse Flow Product And Tariff Methodology Consultation Response Summary Update To The Virtual Reverse Flow Product And Tariff Methodology Consultation Response (ESB) Update To The Virtual Reverse Flow Product And Tariff Methodology Consultation Response (Evolve) Update To The Virtual Reverse Flow Product And Tariff Methodology Consultation Response (FEN) Update To The Virtual Reverse Flow Product And Tariff Methodology Consultation Response (FES) Update To The Virtual Reverse Flow Product And Tariff Methodology Consultation Response (Hall's Pig Farm) Update To The Virtual Reverse Flow Product And Tariff Methodology Consultation Response (Phoenix) Update To The Virtual Reverse Flow Product And Tariff Methodology Consultation Response (United Renewables)