- Modification raised by Centrica on 24th January 2022.
- Modification amended on 3rd February 2022 to change from Self-Governance to Authority Decision.
- Modification amended on 21st July 2022 to make changes to the Solution and other areas of the form.
- IGT159 was issued for consultation on 26th August 2022, with responses due back by 20th September 2022.
- The Panel considered a Variation Request for IGT159 on 28th October 2022, which the Panel unanimously accepted. As a result, IGT159 was withdrawn and replaced with IGT159V.
- The Final Modification Report for IGT159V was presented to Panel on the 28th October 2022. The Panel unanimously agreed to recommend that IGT159V be implemented.
- The Final Modification Report was submitted to the Authority for decision on 31st October 2022.
- The Authority approved IGT159V on 2nd December 2022.
- Modification IGT159V was implemented on 24th February 2024 as part of the February Release.
| Document | Description | Document Type | Author | Date |
| IGT159V | Notice of Implementation (v1.0) | Adobe PDF | Code Administrator | 02/12/2022 |
| IGT159V | Authority Decision | Adobe PDF | Ofgem | 02/12/2022 |
| IGT159V | Post-Panel Final Modification Report (v1.0) | Adobe PDF | Code Administrator | 31/10/2022 |
| IGT159V | Final Legal Drafting (v1.0) | Adobe PDF | Code Administrator | 31/10/2022 |
| IGT159 | Pre-Panel Final Modification Report (v0.1) | Adobe PDF | Code Administrator | 21/10/2022 |
| IGT159 | Variation Request – Modification Proposal (v3.1) | Adobe PDF | Centrica | 06/10/2022 |
| IGT159 | Draft Legal Text (v0.7) | Adobe PDF | Centrica | 06/10/2022 |
| IGT159 | Utility Warehouse Consultation Response | Adobe PDF | Utility Warehouse | 27/09/2022 |
| IGT159 | ScottishPower Consultation Response | Adobe PDF | ScottishPower | 27/09/2022 |
| IGT159 | Last Mile Consultation Response | Adobe PDF | Last Mile | 27/09/2022 |
| IGT159 | Indigo Consultation Response | Adobe PDF | Indigo Pipelines | 27/09/2022 |
| IGT159 | Energy Assets Consultation Response | Adobe PDF | Energy Assets | 27/09/2022 |
| IGT159 | EDF Consultation Response | Adobe PDF | EDF | 27/09/2022 |
| IGT159 | E.ON Consultation Response | Adobe PDF | E.ON | 27/09/2022 |
| IGT159 | Centrica Consultation Response | Adobe PDF | Centrica | 27/09/2022 |
| IGT159 | BUUK Consultation Response | Adobe PDF | BUUK | 27/09/2022 |
| IGT159 | IGT159 Consultation Response Template | Word | Code Administrator | 26/08/2022 |
| IGT159 | Draft Modification Report (v1.0) | Adobe PDF | Code Administrator | 26/08/2022 |
| IGT159 | Draft Legal Text (v0.6) | Adobe PDF | Code Administrator | 26/08/2022 |
| IGT159 | Workgroup Report (v1.0) | Adobe PDF | Code Administrator | 19/08/2022 |
| IGT159 | Draft Legal Text (v0.5) | Adobe PDF | Code Administrator | 19/08/2022 |
| IGT159 | Rough Order of Magnitude (ROM) Request and Response (v1.0) | Adobe PDF | Xoserve | 05/08/2022 |
| IGT159 | Amended Modification Proposal (v3.0) | Adobe PDF | Centrica | 21/07/2022 |
| IGT159 | Amended Modification Proposal (v2.0) | Adobe PDF | Centrica | 03/02/2022 |
| IGT159 | Modification Proposal (v1.0) | Adobe PDF | Centrica | 24/01/2022 |