UNC Transportation Principal DocumentDocument files listed below. General Offtake Arrangements Document Transportation Principal Document European Interconnection Document Independent Gas Transporter Arrangements Document Code Updates Printer friendly version Related Files File 09 September 2024 Transportation Principal Document (Consolidated, printable version) File 01 June 2017 TPD Front Cover File 01 April 2017 TPD Table of Contents File 09 September 2024 TPD Section A - System Classification File 09 September 2024 TPD Section B - System Use and Capacity File 29 March 2023 TPD Section C - Nominations File 09 September 2024 TPD Section D - Operational Balancing and Trading Arrangements File 24 May 2024 TPD Section E - Daily Quantities Imbalances and Reconciliation File 09 September 2024 TPD Section F - System Clearing Balancing Charges and Neutrality File 09 September 2024 TPD Section G - Supply Points File 29 March 2023 TPD Section H - Demand Estimation and Demand Forecasting File 12 August 2024 TPD Section I - Entry Requirements File 13 April 2023 TPD Section J - Exit Requirements File 29 March 2023 TPD Section K - Operating Margins File 09 September 2024 TPD Section L - Maintenance and Operational Planning File 08 March 2024 TPD Section M - Supply Point Metering File 29 March 2023 TPD Section N - Shrinkage File 09 September 2024 TPD Section O - System Planning File 09 September 2024 TPD Section Q - Emergencies File 29 March 2023 TPD Section R - Storage File 09 September 2024 TPD Section S - Invoicing and Payment File 01 April 2017 TPD Section U - Not Used File 09 September 2024 TPD Section V - General File 09 September 2024 TPD Section X - Energy Balancing Credit Management File 09 September 2024 TPD Section Y - Charging Methodologies Download All Files