Integration of High-Voltage Systems in Britain [includes discussion]

High-voltage integration has proceeded in Britain in two well-defined stages, the first about 1930 with the establishment of a 132-kv national grid, and the second now in progress with the construction of a 275/300-kv supergrid. Each stage of development has been associated with important statutory changes. This paper deals broadly with the main problems encountered at each stage, the general principles adopted, and the effect on system planning. The economic basis of the 275/300-kv scheme is discussed with some indication of its implications for the future pattern of electricity supply in Britain.