National Grid plc is an international electricity and gas company and one of the largest investor-owned energy companies in the world. National Grid owns the high-voltage electricity transmission network in England and Wales and operates the system across Great Britain. It also owns and operates the high pressure gas transmission system in Britain and its distribution business delivers gas to 11 million homes and businesses. In the US, National Grid delivers electricity to approximately 3.3 million customers and manages the electricity network on Long Island under an agreement with the Long Island Power Authority (LIPA). Furthermore the company is acting as distributor of natural gas in the northeastern US, serving approximately 3.4 million customers. Additional National Grid also has a number of related businesses such as Liquefied Natural Gas (LNG) importation and storage, land remediation and metering. National Grid plc is headquartered in London, UK.