The general electrical substation locations are initially determined by line routing and transmission requirements. Substation may be needed to enhance supply of electricity from power stations into national grid systems for transmission; or next to urban areas. In some situations, it is needed as a point of grid supply to decrease voltage levels for local distribution firms. Electrical substation locations are governed by these factors. With regard to precise electrical substation locations, the National Grid contains guidelines to help in designing and siting substations to mitigate environmental effects.
Substation guidelines often complement the line routing guidelines of the National Grid and in appropriate circumstances, they are used together.
Proposals for significant or new extensions to electrical substations usually do not need environmental impact assessment. However, the National Grid often undertake pertinent environmental investigations on proposals like this and report the findings of their investigations to local planning authority.
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