LTDS CIM Files

The LTDS CIM dataset provides a structured representation of
the Long-Term Development Statement (LTDS) using the Common Information Model
(CIM), enabling consistent data exchange and network modelling across
Distribution Network Operators (DNOs). 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:
Busbar
sections and their connectivity nodes.
Switching
devices such as breakers, disconnectors, fuses, and load break
switches, including representative feeder breakers for aggregated
modelling.
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).
Compensators,
including shunt, series, and static VAr devices.
Containment
and voltage level associations, defining the hierarchical structure of
substations, voltage levels, and 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), 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 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.

Related Feature Pages

Embedded Capacity Register Page - Our Embedded Capacity Register provides information on generation and storage sites, both connected to and accepted to connect to our network.

Glossary of Terms
Our Glossary dataset provides definitions for various terms and acronyms found throughout our data. If the term you are searching for isn't in our list, please let us know via our Open Data team and we will get it added!
Data Governance
If you wish to view the data triage document for any dataset, they can be found in our Data Triage Assessment dataset.
This dataset DOES require a login to view
Any data caveats for the dataset are listed below
- None