IntroductionThis dataset is a geospatial view of the areas fed by grid substations. The aim is to create an indicative map showing the extent to which individual grid substations feed areas based on MPAN data. Methodology Data Extraction and Cleaning: MPAN data is queried from SQL Server and saved as a CSV. Invalid values and incorrectly formatted postcodes are removed using a Test Filter in FME. Data Filtering and Assignment: MPAN data is categorized into EPN, LPN, and SPN based on the first two digits. Postcodes are assigned a Primary based on the highest number of MPANs fed from different Primary Sites. Polygon Creation and Cleaning: Primary Feed Polygons are created and cleaned to remove holes and inclusions. Donut Polygons (holes) are identified, assigned to the nearest Primary, and merged. Grid Supply Point Integration: Primaries are merged into larger polygons based on Grid Site relationships. ny Primaries not fed from a Grid Site are marked as NULL and labeled. Functional Location Codes (FLOC) Matching: FLOC codes are extracted and matched to Primaries, Grid Sites and Grid Supply Points. Confirmed FLOCs are used to ensure accuracy, with any unmatched sites reviewed by the Open Data Team. Quality Control Statement Quality Control Measures include: Verification steps to match features only with confirmed functional locations. Manual review and correct of data inconsistencies Use of additional verification steps to ensure accuracy in the methodology Regular updates and reviews documented in the version history Assurance Statement The Open Data Team and Network Data Team worked with the Geospatial Data Engineering Team 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/To view this data please register and login.