National Grid plc specializes in owning and operating electricity and gas networks. Net sales break down by activity as follows:
transmission and distribution in the United States (63.3%): electricity transmission (owned 14,659 km of overhead lines, 169 km of underground cables and 396 substations, at the end of March 2020), electricity distribution (117,488 km of circuits and 730 substations) and distribution of gas (57,425 km of gas pipelines);
- transport and distribution in the United Kingdom (31.7%): electricity transmission (80.2% of net sales; 7,212 km of high-voltage network and 2,239 km of underground cables) and gas transmission (19,8%; 7,630 km of network);
- other (5%): telecom and interconnection activities among the various domestic electrical networks, liquefied natural gas storage activities, etc.
Net sales are distributed geographically as follows: the United Kingdom (36.3%) and the United States (63.7%).