| Energy supplier | Switching time |
| Affect Energy | 17 days |
| Avro | 28 days |
| Better Energy | 3 weeks |
| Bristol Energy | 3 weeks |
| British Gas | 21 days |
| Bulb Energy | 21 days |
| Co-operative Energy | 6-8 weeks |
| Daligas | 2-4 weeks |
| Economy Energy | 3 weeks |
| EDF | 3 weeks |
| Engie | 3 weeks |
| Enstroga | 21 days |
| Entice | 21 days |
| EON | 17 days |
| Extra Energy | 5 weeks |
| Fairer Power | 21 days |
| First Utility | 21 days |
| Flow Energy | 21 days |
| Glide | 21 days |
| Gnergy | 28 days |
| Go Effortless | 17 days |
| Good Energy | 3 weeks |
| Green Energy UK | 21 days |
| Green Network Energy | 3-4 weeks |
| Green Star Energy | 22 days |
| iSupplyEnergy | 21 days |
| M&S Energy | 21 days |
| npower | 21 days |
| Octopus Energy | 17 days |
| One Select | 19 days |
| Ovo Energy | 20 days |
| Peterborough Energy | 4 weeks |
| PFP Energy | 21 days |
| Powershop | 21 days |
| Robin Hood Energy | 3-6 weeks |
| Sainsbury’s Energy | 2.5 weeks |
| Scottish Power | 3 weeks |
| So Energy | 21 days |
| Solarplicity | 21 days |
| Spark Energy | 21 days |
| SSE | 21 days |
| Tonik Energy | 3-4 weeks |
| Toto Energy | 21 days |
| Utilita Energy | 21 days |
| Utility Warehouse | 3 weeks |
| Woodland Trust Energy | 20 days |
A full list of participating Energy suppliers can be found on the Energy Switch Guarantee website.