Long Term Development Statement (LTDS) Table 3a Observed Peak Demand - Transposed

The LTDS is published at the end of May and November each year. This is Table 3a from our current LTDS report (published 29th May 2026), 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.