National Grid Plc engages in the transmission and distribution of electricity and gas in Great Britain and northeastern U.S. It operates through four segments: UK Electricity Transmission, UK Gas Transmission, UK Gas Distribution and U.S. Regulated. The UK Electricity Transmission segment engages in electricity transmission in England and Wales. The day-to-day operations of the system involves the continuous real-time matching of demand and generation output. The UK Gas Transmission segment owns and operates the gas national transmission system in Great Britain, with day-to-day responsibility for balancing demand. The UK Gas Distribution segment owns and operates regional gas distribution network in Great Britain. The U.S. Regulated segment owns and operates electricity distribution networks in upstate New York, Massachusetts, and Rhode Island. The company was founded on July 11, 2000 and is headquartered in London, the United Kingdom.