Connection and Use of System Code - CUSC

Connection and Use of System Code (CUSC), which constitutes the contractual framework for connection to, and use of, National Grid’s high voltage transmission system.

Information relating to all aspects of the Connection and Use of System Code (CUSC) can be accessed on these pages, including documents relating to proposed amendments to the CUSC and Information on the CUSC Panel.

If you wish to apply to connect to or use the National Grid Transmission System or interconnector, then please click on application forms in the left hand menu.

Meeting Documents

The CUSC Amendments Panel hold regular meetings. Papers from the most recent are below

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National Grid offers a free subscription service for CUSC, STC and Grid Code Alerts via email.

CUSC Documents

Combined PDF's are shown below. A breakdown of the document is under CUSC Contracts.

CUSC Summary

This document provides a summary of the Connection and Use of System Code (CUSC).