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National Gas Transmission Plc engages in the natural gas transmission and distribution services. It operates through the Gas Transmission and Metering segments. The Gas Transmission segment includes network in Britain and liquefied natural gas storage activities. The Metering segment provides regulated gas metering activities in the UK, together with corporate activities. The company was founded on April 1, 1986 and is headquartered in Warwick, the United Kingdom.

National Grid Electricity Transmission Plc engages in the business of ownership and operation of regulated electricity transmission networks in Great Britain. The company was founded on April 1, 1989 and is headquartered in London, the United Kingdom.

National Grid Holdings One Plc provides electricity and gas distribution services. The company is headquartered in London, the United Kingdom.

National Grid Holdings Ltd. owns and operates a high-voltage electricity transmission network services. The company is headquartered in London, the United Kingdom.

National Grid (US) Holdings Ltd. provides business support services. The company was founded on July 18, 1991 and is headquartered in London, the United Kingdom.

National Grid Gas Holdings Ltd. operates as an investment holding company. The company is headquartered in London, the United Kingdom.

Britned Development Ltd. engages in the transmission of electricity. The joint venture company is based in London, UK.

National Grid (US) Investments 4 Ltd. provides business support services. The company was founded on October 22, 1999 and is headquartered in London, the United Kingdom.

National Grid Grain LNG Ltd. engages in the extraction of crude petroleum. It operates a liquefied natural gas (LNG) terminal; and provides primary and secondary capacity, and truck and ship reloading services. The company was founded on June 18, 2002 and is headquartered in Rochester, the United Kingdom.

National Grid Interconnectors Ltd. engages in transmission of electricity. The company is headquartered in London, the United Kingdom.

Part of National Grid Plc, Thamesport Interchange Ltd. is a British real estate company that owns and operates properties. The company is based in London, UK and was founded in 2007.

Australian Energy Market Operator Ltd. provides a combination of electric, gas, and other services. The private company is based in Melbourne, Australia. Daniel Francis Westerman has been the CEO of the Australian company since 2021.

Advanced Energy United, Inc. engages in provision of energy solutions. It offers power and transportation electrification. The company is headquartered in San Francisco, CA.

Part of National Grid Plc, National Grid North Sea Link Ltd. is a British dormant company. The company is based in London, UK. Founded in 2012.

Part of National Grid Plc, Lattice Group Ltd. functions as an investment holding British company. The company is based in London, UK.

Part of National Grid Plc, National Grid IFA 2 Ltd. is a British company that provides business support services. The company is based in London, UK.

Part of National Grid Plc, National Grid Smart Ltd. is a British company that engages in financing and leasing of smart meters to energy suppliers. The company is based in London, UK and was founded in 2016.

Nemo Link Ltd. is a British company that designs, develops, finances, and owns electricity networks. The joint venture company is based in London, UK and was founded in 2012.