We are a separate company

On 1 April the Electricity System Operator became a legally separate company within the National Grid Group. Find out more about what this change means.

Connection and Use of System Code (CUSC)

The Connection and Use of System Code (CUSC) is the contractual framework for connection to, and use of, the National Electricity Transmission System (NETS).

The Connection and Use of System Code (CUSC) is the contractual framework for connection to, and use of, the National Electricity Transmission System (NETS). We are the Code Administrator for the CUSC and maintains the Code. All changes are subject to industry consultation and approval by either Ofgem or the CUSC Modifications Panel. If you are interested in becoming a CUSC party visit our 'connections' pages.