The Long Term Development statements provide information for anyone connecting to our distribution system at extra high voltage (EHV) level (including HV busbar of primary substations). It is designed to help to identify and evaluate opportunities for entering into arrangements with us relating to use of system or connection. Our statements include the following: network data; the likely development of our distribution system; plans for modifying the distribution system; and identification of parts of the distribution system that are likely to reach capacity limit in the next years. A long term development statement is available for each of our distribution network areas in central southern England and northern Scotland. Each statement has two sections, a summary (Part 1) and a detailed section (Part 2) both of which are available for download below.
SSEN Data Triage record for SEPD Long Term Development Statement
SEPD LTDS 132 and 33 kV Geographic Map issued Nov 2022
SEPD LTDS 132&33kV Geographic Map Nov 23
Southern Electric Power Distribution long term development statement tables Nov 24
XLSXSEPD Long Term Development Statement part 1 & 2 May 2024
Southern Electric Power Distribution long term development statement tables May 2023
XLSXLTDS Data Surgery Part 2 - CIM Formats (26th February 2025)
URLMethodology Statement - SEPD Long Term Development Statement
SEPD LTDS Part 1&2 Nov 23
LTDS Purpose and Overview
SEPD Geographic Plan 1 Nov 2025
SEPD LTDS Tables Nov 23
XLSXSEPD- LTDS CIM EQ Profile
ZIPSEPD LTDS Tables May 2024
XLSXSEPD LTDS 66 and 22 kV Geographic Map Nov 24
PDFLong Term Development Statement Data Definitions
Southern Electric Power Distribution long term development statement schematic diagrams May 25
PDFSEPD Long Term Development Statement Schematic Diagrams issued Nov 2022
Southern Electric Power Distribution Long Term Development Statement Schematic Diagrams Nov 2025
PDFSouthern Electric Power Distribution long term development statement tables May 25
XLSXSEPD Geographical Plan 2 Nov 2025
PDFLTDS Data Surgery Part 1 (26th February 2025)
URLSouthern Electric Power Distribution long term development statement part 1 & 2 Nov 2024
SEPD LTDS 66 & 22kV Geographic Map Nov 23
PDFSEPD LTDS 132&33kV Geographic Map Nov 23
SEPD LTDS Schematic Diagrams Nov 23
Southern Electric Power Distribution Long Term Development Statement Schematic Diagrams May 2025
PDFSEPD LTDS 132 and 33 kV Geographic Map Nov 24
Southern Electric Power Distribution long term development statement part 1 & 2 May 25
Southern Electric Power Distribution Long Term Development Statement Tables 1-6 Nov 25
XLSXSouthern Electric Power Distribution long term development statement schematic diagrams Nov 24
PDFSEPD Long Term Development Statement Part 1 and 2
Southern Electric Power Distribution Long Term Development Statement Tables May 25
XLSXSEPD Long Term Development Statement Part 1 - May 2023
Scottish Electric Power Distribution long term development statement part 1 & 2 Nov 2025
PDFSEPD LTDS 66 and 22 kV Geographic Map issued Nov 2022
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