The high-voltage (400 kV and 275 kV) electricity substations in the United Kingdom are listed in the following tables. The substations provide entry points to, and exit points from, the National Grid (GB) or Northern Ireland Electricity Network. Entry points include power stations, major wind farms and inter-connectors from other countries and regions. Exit points are to lower voltage (275 kV, 132 kV, 66 kV and 33 kV) transmission and distribution substations which are also shown in the tables.