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An Electrical Grid, Electric Grid or Power Grid, is an interconnected network for delivering electricity from producers to consumers. It consists of:[1] generating stations that produce electric power electrical substations for stepping electrical voltage up for transmission, or down for distribution high voltage transmission lines that carry power from distant sources to demand-centers distribution lines that connect individual customers

Electrical grids vary in size from covering a single building through national grids (which cover whole countries) to transnational grids (which can cross continents).

Source: Electric Grid