Below we have listed every UK energy supplier in the domestic market, along with the % of the market they hold as of March 2021. Updated to include lastest suppliers that have been sold or gone bust (as of 19th September 2021)
| Supplier Name | % of Customers |
| Affect Energy (Sold to Octopus Energy) | |
| Atlantic | |
| Avro Energy | 1.9% |
| Boost Energy | |
| Bristol Energy | |
| British Gas | 18% |
| British Gas Evolve | |
| Bulb Energy | 5.9% |
| Co-Operative Energy | 1% |
| Daligas | |
| E (Gas and Electricity) | |
| E.ON | 12.3% |
| E. ON Next | |
| Ecotricity | |
| EDF Energy | 10.4% |
| Engie (Sold to Octopus Energy) | |
| Enstroga | |
| Entice Energy | |
| ESB Energy | |
| Fairer Power | |
| Go Effortless Energy | |
| Good Energy | |
| Green Energy UK | |
| Green.Energy | |
| Green Network Energy (has now gone bust) | |
| HUB Energy (has now gone bust) | |
| igloo.energy | |
| Lumo | |
| M&S Energy | |
| MoneyPlus Energy (has now gone bust) | |
| Nabuh | |
| Neon Reef | |
| NEO Energy | |
| npower | 5.8% |
| npower Select | |
| Octopus Energy | 5.7% |
| Orbit Energy | |
| Outfox the Market | |
| Ovo Energy | 14.9% |
| People’s Energy (has now gone bust) | |
| PFP Energy (has now gone bust) | |
| Powershop | |
| Pure Planet | |
| Sainsbury’s Energy | |
| Scottish Power | 8.9% |
| Shell Energy | 2.9% |
| So Energy | |
| Spark Energy | |
| SSE | |
| Utility Warehouse | 1.9% |
| Together Energy | |
| Utilita Energy | 2.7% |
| Utility Point (has now gone bust) | |
| Zog Energy |
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