Formal Consultation on the Form of Long Term Development Statement

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The publication of Long Term Development Statements (LTDS), describing the characteristics and development of GB electricity distribution networks, is a long standing obligation on distribution network operators (DNOs), mandated through a direction, pursuant to paragraph 25.2 of the standard conditions of the Electricity Distribution Licence and described in detail in the Form of Long Term Development Statement (FoS).

In accordance with the requirements of paragraph 25.6 of the standard conditions of the Electricity Distribution Licence, the Notice below sets out our intention to give a direction revising the FoS. A draft copy of the direction is provided, along with the revised FoS and associated Annexes and Appendices.

The revised FoS introduces important new requirements for grid model data to be provided using the Common Information Model (CIM) and for the publication of Capacity Heatmap data. These changes build upon the work undertaken by the LTDS Reforms Working Group, and follow an informal consultation on the revised FoS that closed on 10 October 2023. A track changed version of the FoS is published below, along with a letter, setting out the key areas of feedback that we received from stakeholders at the informal consultation stage and the changes that have been made to the FoS and associated Annexes and Appendices as a result of this feedback.

In accordance with the Notice below, any representations with respect to the proposed direction must be made on or before 7 February 2024 by email to ben.watts@ofgem.gov.uk.

We are publishing the FoS along with all supporting Annexes and Appendices. The files in zip folders are machine readable only and are included for completeness; they are not intended to be readable by visitors to the website.

Respond name

Ben Watts

Respond email

ben.watts@ofgem.gov.uk

Main document

[Notice – LTDS [PDF, 107.38KB]

](https://www.ofgem.gov.uk/sites/default/files/2024-01/Notice%20-%20LTDS.pdf)

[DRAFT Direction LTDS [PDF, 108.14KB]

](https://www.ofgem.gov.uk/sites/default/files/2024-01/DRAFT%20Direction%20LTDS.pdf)

[LTDS Form of Statement Formal Consultation Letter [PDF, 134.86KB]

](https://www.ofgem.gov.uk/sites/default/files/2024-01/LTDS%20Form%20of%20Statement%20Formal%20Consultation%20Letter.pdf)

[Form of Long Term Development Statement [PDF, 496.81KB]

](https://www.ofgem.gov.uk/sites/default/files/2024-01/Form%20of%20Long%20Term%20Development%20Statement.pdf)

[Form of Long Term Development Statement – Track Changes [PDF, 575.23KB]

](https://www.ofgem.gov.uk/sites/default/files/2024-01/Form%20of%20Long%20Term%20Development%20Statement%20-%20Track%20Changes.pdf)

Subsidiary documents

[LTDS Grid Modelling Annex 1 – Grid Modelling Guidelines [PDF, 1.81MB]

](https://www.ofgem.gov.uk/sites/default/files/2024-01/LTDS%20Grid%20Modelling%20Annex%201%20-%20Grid%20Modelling%20Guidelines.pdf)

[LTDS Grid Modelling Annex 2 – Data Exchange Specifications [PDF, 5.81MB]

](https://www.ofgem.gov.uk/sites/default/files/2024-01/LTDS%20Grid%20Modelling%20Annex%202%20-%20Data%20Exchange%20Specifications.pdf)

[Capacity Heatmaps Appendix 1 – Information Model [PDF, 532.37KB]

](https://www.ofgem.gov.uk/sites/default/files/2024-01/Capacity%20Heatmaps%20Appendix%201%20-%20Information%20Model.pdf)

[Capacity Heatmaps Appendix 2 – Open API [ZIP, 6.32KB]

](https://www.ofgem.gov.uk/sites/default/files/2024-01/Capacity_Heatmaps_Appendix_2_Open_API.zip)

[Grid Modelling Appendix 1 – LTDS Information Model and Profiles in UML [ZIP, 42.72MB]

](https://www.ofgem.gov.uk/sites/default/files/2024-01/Grid_Modelling_Appendix_1_LTDS_Information_Model_and_Profiles_in_UML.zip)

[Grid Modelling Appendix 2 – LTDS Information Model Extension Definitions and Diagrams [PDF, 744.33KB]

](https://www.ofgem.gov.uk/sites/default/files/2024-01/Grid%20Modelling%20Appendix%202%20-%20LTDS%20Information%20Model%20Extension%20Definitions%20and%20Diagrams.pdf)

[Grid Modelling Appendix 3 – LTDS Profiles in RDFS [ZIP, 211.62KB]

](https://www.ofgem.gov.uk/sites/default/files/2024-01/Grid_Modelling_Appendix_3_LTDS_Profiles_in_RDFS.zip)

[Grid Modelling Appendix 4 – LTDS Difference Profile Definitions and Diagrams [PDF, 1.60MB]

](https://www.ofgem.gov.uk/sites/default/files/2024-01/Grid%20Modelling%20Appendix%204%20-%20LTDS%20Difference%20Profile%20Definitions%20and%20Diagrams.pdf)

[Grid Modelling Appendix 5 – LTDS Merged Profile Class and Attribute Lists [XLSX, 77.77KB]

](https://www.ofgem.gov.uk/sites/default/files/2024-01/Grid%20Modelling%20Appendix%205%20-%20LTDS%20Merged%20Profile%20Class%20and%20Attribute%20Lists.xlsx)

[Grid Modelling Appendix 6 – LTDS Subset of CGMES [ZIP, 42.69KB]

](https://www.ofgem.gov.uk/sites/default/files/2024-01/Grid_Modelling_Appendix_6_LTDS_Subset_of_CGMES_Constraints_in_SHACL.zip)

[Grid Modelling Appendix 7 – LTDS Subset of CGMES Constraints Descriptions [PDF, 340.71KB]

](https://www.ofgem.gov.uk/sites/default/files/2024-01/Grid%20Modelling%20Appendix%207%20-%20LTDS%20Subset%20of%20CGMES%20Constraints%20Descriptions.pdf)

[General Appendix 1 - Short Circuit Result Profile Definitions and Diagrams [PDF, 303.25KB]

](https://www.ofgem.gov.uk/sites/default/files/2024-01/General%20Appendix%201%20-%20Short%20Circuit%20Result%20Profile%20Definitions%20and%20Diagrams.pdf)

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