Every company licensed by Ofgem to operate in the British gas and electricity markets, from the household suppliers you can switch to, through the shippers and traders that move energy around the wholesale market, to the network companies that own the pipes and wires. This directory is built from the official Ofgem licensee registers dated 10 August 2026 and covers 1,332 companies holding 1,470 licences across 17 licence types.
Electricity licences
ElectricityElectricity Distribution Network Operators (DNOs)
Owns and operates a regional electricity distribution network (DNO).
ElectricityIndependent Electricity Distribution Network Operators (IDNOs)
Owns and operates independent local electricity networks (IDNO).
ElectricityElectricity Generation Licensees
Is licensed to generate electricity for the grid.
ElectricityElectricity Interconnector Licensees
Operates high voltage cables linking GB with other electricity markets.
ElectricityElectricity Suppliers (Domestic and Non-Domestic)
May sell electricity to both households and businesses.
ElectricityElectricity Suppliers (Non-Domestic)
May sell electricity to businesses and other non-domestic customers.
ElectricityElectricity System Operator
Balances electricity supply and demand across Great Britain.
ElectricityElectricity Transmission Licensees
Owns and operates high voltage transmission infrastructure.
Gas licences
GasGas Interconnector Licensees
Operates pipelines linking the GB gas network with other countries.
GasGas Shipper Licensees
Moves wholesale gas through the national pipeline system for onward sale to suppliers.
GasGas Suppliers (Domestic and Non-Domestic)
May sell gas to both households and businesses.
GasGas Suppliers (Non-Domestic)
May sell gas to businesses and other non-domestic customers.
GasGas Suppliers (Private Network)
May supply gas on private networks, such as a council or university estate.
GasIndependent Gas Transporters (IGTs)
Owns and operates independent local gas networks, typically on new developments.
GasGas Transporter (National Transmission System)
Operates the national high pressure gas transmission system.
Cross-market licences
BothSmart Meter Communication Licensee
Runs the national smart meter communications network.