Off-peak EV tariffs: how to pick one
The cheap overnight rate is funded by a higher daytime one. Whether you win depends on your whole household, not just the car.
An off-peak EV tariff can cut your charging cost by three-quarters. It can also raise your total bill. Which one happens depends on your household, not your car.
How they work
A block of cheap hours overnight, and a higher rate for the rest of the day. The cheap block is typically four to seven hours in the small hours.
The discount is not free money — it is cross-subsidised by the daytime rate. Suppliers offer it because shifting load off peak is worth something to them.
Who wins
You win if you can move most of your consumption into the window: car charging, dishwasher, washing machine, hot water, and a home battery if you have one.
You lose if your household uses most of its electricity during the day and you cannot move it. A home-working household with high daytime use can end up worse off.
What to check before switching
The window. Length and timing. A four-hour window at 00:30 is a different proposition from seven hours starting at 23:00.
The day rate. This is the number that decides whether you win. Compare it against what you pay now, not against the off-peak rate.
Your actual usage split. Your smart meter data will tell you what fraction of your consumption is already overnight. That is the honest input.
Exit terms. If it does not work out, what does leaving cost?
Making it work
Schedule the car, do not babysit it. Set the charger or the car to start inside the window and forget about it. Plugging in at 6pm and charging immediately means paying the day rate for most of the session.
Move the big appliances. Dishwasher and washing machine on delay timers are meaningful load.
Check it worked. A month later, compare the bill to the previous one. If it went up, the tariff is wrong for your household, and switching back is not a failure.
The size of the prize
At the off-peak rate, a full charge on a 60 kWh car is a few pounds. At the standard rate it is roughly four times that. Over a year of typical mileage the difference runs to several hundred pounds — the arithmetic is in the £7 fill-up, and the charging cost calculator will do it with your numbers.
In pictures
Common questions
Can I get one without an EV?
Some require proof of an EV or a smart charger; others do not. Terms vary by supplier and change often.
What if I cannot shift my usage?
Then an EV tariff can cost you more overall. The overnight discount is funded by the daytime premium, and a household that uses most of its power in the day pays for that.
About the author
ElectraMile EditorialEditorial desk
The ElectraMile editorial team covers charging, running costs and EV ownership for readers in the UK and US.
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Figures shown for United Kingdom in GBP. Switch market in the header to see local pricing and terminology.
