National Grid Plc engages in the transmission and distribution of electricity and gas. It operates through the following segments: UK Electricity Transmission, UK Gas Transmission, and U.S. Regulated. The UK Electricity Transmission segment engages in electricity transmission in England and Wales. 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 U.S. Regulated segment owns and operates electricity distribution networks in upstate New York, Massachusetts, and Rhode Island. The company was founded in 1989 and is headquartered in London, the United Kingdom.