The cheapest fixed overnight rate in this list, across the longest window: 6.99p/kWh from 11pm to 6am, seven hours. That combination beats Octopus Intelligent Go, which charges 8p across six. EDF's supply is backed by nuclear and renewable generation, so it is also one of the lower-carbon options here — but the reason to take it is the rate.
Best for: Anyone whose priority is the cheapest guaranteed overnight unit rate, and who has a large battery or a long commute that needs more than five or six hours to refill.
How It Works
GoElectric is a plain time-of-use tariff. Between 11pm and 6am you pay 6.99p/kWh. For the remaining seventeen hours you pay 28.91p/kWh. No smart charger integration, no vehicle API, no scheduling algorithm — set a timer and let it run.
That simplicity is the trade. Octopus and OVO will find cheap half-hours for you; EDF gives you a longer cheap window and expects you to use it.
Who It Suits
Seven hours at 7kW is 49kWh — enough to refill a Model S from nearly flat inside one window, which no five-hour tariff can do. It suits high-mileage drivers, large batteries, and anyone who would rather have a wide window than a clever one. It also suits EV owners who care where the electricity comes from: EDF's generation mix is predominantly nuclear and renewable.
The catch is the contract. GoElectric is a 12-month fix with exit fees, so the rate that makes it worth taking is also the thing you are locked into if the market moves.
Cost Breakdown
These figures isolate EV charging electricity. They do not include household use or postcode-dependent standing charges.
| Scenario | Cost per full charge | EV electricity only (10k miles) |
|---|
| EDF GoElectric (6.99p/kWh) | ~£4.19 | ~£200 |
| Octopus Intelligent Go (8p/kWh) | ~£4.80 | ~£229 |
| Standard variable (~26.11p/kWh) | ~£15.67 | ~£746 |
Against a standard variable tariff that is roughly £546 a year at 10,000 miles — the largest saving of any fixed-rate tariff here.
Compatible Chargers
Any charger works with GoElectric. Set your Tesla Wall Connector or Zappi GLO to start charging at 11pm, and you're covered. There is no smart charger integration, so the simplest chargers work just as well as premium ones on this tariff — which is part of the point.
Read the EDF GoElectric vs Intelligent Go comparison for the rate-versus-automation decision. For the wider market, see the tariff comparison guide and UK EV Charging Cost Index.
