The substations and the grid operated at 132 kV and provided local and regional inter-connections. The first high-voltage substations in Britain were built as part of the National Grid in 1927–33 by the Central Electricity Board under the provisions of the Electricity (Supply) Act 1926. 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. Entry points include power stations, major wind farms and inter-connectors from other countries and regions. The substations provide entry points to, and exit points from, the National Grid (GB) or Northern Ireland Electricity Network. The high-voltage (400 kV and 275 kV) electricity substations in the United Kingdom are listed in the following tables.
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