Introduction
The LTDS CIM dataset provides a structured representation of the Long-Term Development Statement (LTDS) using the Common Information Model (CIM), enabling Interoperable consistent data exchange and network modelling across Distribution Network Operators (DNOs).
The CIM LTDS profiles are developed based on the CGMES (Common Grid Model Exchange Specification) profiles, which are defined under the IEC 61970 and IEC 61968 standards. The LTDS profiles incorporate additions and deviations from these CGMES profiles to meet the specific British requirements of the LTDS framework. A central component of this dataset is the LTDS Equipment (EQ) Profile, which forms the foundational layer of physical grid data.
The EQ Profile describes the physical equipment and connectivity of the distribution network, covering assets from the 132kV level (or EHV in Scotland) down to the lower voltage busbars of primary substations. It includes:
- Circuits, modelled via AC line segments with impedance and seasonal ampacity limits.
- Transformers, including winding details, tap changers, and seasonal apparent power limits.
- Loads, represented as individual or aggregated energy consumers depending on voltage level.
- Generation and storage, modelled by fuel type and connection voltage, using appropriate CIM classes (e.g., SynchronousMachine, PowerElectronicsConnection).
- Busbar sections and their connectivity nodes.
- Switching devices such as breakers, disconnectors, fuses, and load break switches, including representative feeder breakers for aggregated modelling.
- Compensators, including shunt, series, and static VAr devices.
- Containment and voltage level associations, defining the hierarchical structure of substations, voltage levels, and sub geographical regions.
- External connections and model reductions, using equivalent injections and branches to represent networks outside the licensee’s scope.
This profile underpins other future LTDS CIM profiles such as Short Circuit (SC), System Capacity (SYSCAP) , Geographical Location (GL), and Steady State Hypothesis (SSH), and is essential for building Full Models and Difference Models used in planning, forecasting, and regulatory reporting. This dataset is designed to support interoperability, planning, and analysis across DNOs and stakeholders.
The supporting documentation can be found on our library using the following link: LTDS CIM Deliverables - November 2025
Shared Data Request Form
This dataset has been triaged as 'Shared' (see attached data sharing risk assessment). To request access to this dataset, please fill out the Shared Data Request Form
Methodological Approach
The models were developed by configuring all required LTDS CIM classes, attributes, and associations, while sensitive data was excluded to produce an EQ Profile showing equipment and connectivity status. Conformity and Interoperability tests were performed iteratively to ensure usability, accuracy and alignment with the relevant standards.
Quality Control Statement
Quality control measures applied during the development of the LTDS CIM models include:
- Execution of Interoperability round-trip tests and independent XML-based validation to confirm structural completeness and data exchange reliability.
- Application of the latest SHACL constraints to ensure compliance with current LTDS CIM schema requirements and guidance developed in coordination with Ofgem and the LTDS CIM Working Group, established under the ENA Data and Digitalisation Steering Group (DDSG) Work Programme.
Assurance Statement
The Network Insights Team collaborated closely with Data Interoperability Engineers and Modelling Engineers to ensure the LTDS CIM models meet the required standards of accuracy, consistency, and interoperability.
This work was coordinated with Ofgem and the LTDS CIM Working Group, ensuring that all models published for the three licence areas reflect agreed methodologies and best practice.
Other
The LTDS Data Exchange Definition artefacts were developed to support Stage 1.3 of the CIM LTDS grid modelling. Publication notes were also produced to provide guidance on the current EQ model. All artefacts and notes for this release are available on the BSI Engagement Hub at: LTDS Stage 1.3 Publication Notes.
For any further inquiries, please contact us at via email to
networkinsights@ukpowernetworks.co.uk
The dataset is updated every May and November in line with regulatory requirements and is intended to improve transparency, interoperability, and stakeholder engagement across the energy sector.
You can download metadata information here:
Eastern Power Networks (EPN)
London Power Networks (LPN)
South Eastern Power Networks (SPN)
Definitions of key terms related to this dataset can be found in the Open Data Portal Glossary: https://ukpowernetworks.opendatasoft.com/pages/glossary/