- Avanti Gas Ltd
- Avro Energy
- Bristol Energy
- British Gas
- Budget Energy Limited
- Bulb Energy
- Clever Energy
- ECOTRICITY
- EDF Energy
- EON
- Good Energy
- Green Energy UK
- Green Network Energy
- Green Star Energy
- Gulf Gas and Power
- iSupplyEnergy Limited
- Octopus Energy
- Outfox The Market
- OVO Energy
- Scottish Power
- Shell Energy
- SPARK ENERGY
- SSE
- Utilita Energy
- Utility Warehouse
