GSP

Grid Supply Points are the interfaces between the high-voltage transmission network (operated by National Grid ESO) and the lower-voltage distribution networks (operated by DNOs). Think of them as the "junction boxes" where national electricity highways meet regional roads.

Key facts:

• Approximately 340 GSPs across Great Britain
• Each GSP serves a specific geographic area
• Electricity flows from transmission (132kV+) to distribution at GSPs
• Used for settlement and pricing purposes
• TNUoS charges vary by GSP group (14 zones)

Your GSP group affects your TNUoS charges, with different zones having different locational charges. Northern Scotland typically has the highest transmission charges because electricity must travel furthest from southern generation sources.

The GSP Group ID is a letter (A to P, excluding I and O) that identifies which transmission demand zone your supply falls into.