Introduction National Grid sites (Transmission System) that feed UK Power Networks' Primary substations (Distribution System). Methodological Approach This was created internally by combining the primary feeding areas according to which Grid Supply Point is upstream. Quality Control Statement Quality Control Measures include: Manual review and correction of data inconsistencies Use of additional verification steps to ensure accuracy in the methodology Assurance Statement The Open Data Team checked 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: Open Data Portal Glossary