The Grid Code specifies technical requirements for connection to, and use of, the National Electricity Transmission System (NETS). Compliance with the Grid Code is a requirement under the Connection and Use of System Code (CUSC).
National Grid is the Code Administrator for the Grid Code and maintains the Code. All changes are subject to Industry Consultation and approval by Ofgem.
If you are interested in a connection to the NETS visit New Electricity Connections.