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 and New England (50.6%); - operation of electricity networks for transmission operators in the United Kingdom (18.9%); - electricity transmission in the United Kingdom (13.6%): owning, at the end of March 2024, a network of over 7,000 km of overhead power lines and over 300 substations; - electricity distribution in the United Kingdom (7.9%): electricity distribution (220,000 km of overhead lines and underground cables, and more than 185,000 substations); - other (7.9%): 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 (45.7%) and the United States (54.3%).