National Grid

At its inception the CEGB operated 2,763 circuit-km of high-tension 275kV supergrid. The growth of the high voltage National Grid over the lifetime of the CEGB is demonstrated in the following table.

Substations

In 1981-1982 there was a total of 203 substations operating at 275/400kV, these sub-stations included 570 transformers operating

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