National Grid specializes in owning and operating electricity and gas networks. Net sales break down by activity as follows:
- transport and distribution in the United States (56.3%): electricity distribution (3.4 million customers and more than 112,100 km of network), gas distribution (nearly 3.5 million customers located in New York state and a network of nearly 58,000 Km), electricity transportation (13,700 km of network);
- transport and distribution in the United Kingdom (38.7%): transport of gas (71% of sales; 7,200 km of gas network; 7,662 km of high-tension network and 1,350 km of underground electrical cables) and gas distribution (29%; nearly 10.8 million customers and 132,000 Km of network);
- other (5%): telecom and interconnection activities among the various domestic electrical networks, liquefied natural gas storage activities, etc.
Net sales break down geographically as follows: the United Kingdom (43.4%) and the United States (56.6%).