EV tariff whole-home comparison
Is an EV tariff worth it with 1,500 kWh of EV charging per year?
The car is only part of the decision. These examples also include 3,200 kWh/year of non-EV household electricity because a higher peak rate can offset cheap overnight charging.
Base worked exampleEV tariff saves £76 per year
90% of EV charging off-peak · 31p peak / 8p off-peak · 26p comparison tariff
Whole-home tariff sensitivity
| Scenario | Comparison rate | EV tariff peak/off | EV off-peak share | Comparison cost | EV tariff cost | Annual difference | Break-even off-peak share |
|---|---|---|---|---|---|---|---|
| Cautious | 26p | 33/10p | 70% | £1,404 | £1,492 | £88 current saving | 95% |
| Base | 26p | 31/8p | 90% | £1,404 | £1,329 | £76 EV saving | 68% |
| Strong off-peak use | 28p | 29/7p | 100% | £1,498 | £1,216 | £283 EV saving | 14% |
Why household consumption is included
If the EV tariff raises the daytime rate for the rest of the house, cheap overnight car charging must first cover that extra household cost. Standing charges matter too.
All tariff rates are illustrative. Check exact current rates, time windows, standing charges, eligibility and tariff terms available to you.