Introduction The Long Term Development Statements (LTDS) report on a 0-5 year period, describing a forecast of load on the network and envisioned network developments. The LTDS is published at the end of May and November each year. This is Table 3a from our current LTDS report (published 29 November 2024), showing the observed substation peak demands with no correction for demand served by generation. This data has been transposed to show years as rows. More information and full reports are available from the landing page below: Long Term Development Statement and Network Development Plan Landing Page Methodological Approach Site Functional Locations (FLOCs) are used to associate the HV or LV Substation to Key characteristics of active Grid and Primary sites — UK Power Networks ID field added to identify row number for reference purposes Data is transposed to show year as a value rather than a field - this allows the data to be viewed graphically. Quality Control Statement Quality Control Measures include: Verification steps to match features only with confirmed functional locations. Manual review and correction of data inconsistencies. Use of additional verification steps to ensure accuracy in the methodology. Assurance Statement The Open Data Team and Network Insights Team worked together to ensure data accuracy and consistency. Other Download dataset information: Metadata (JSON) Definitions of key terms related to this dataset can be found in the Open Data Portal Glossary: https://ukpowernetworks.opendatasoft.com/pages/glossary/