An EV tariff is an electricity deal that prices the energy used to charge your car separately — usually at a lower rate, usually overnight. Instead of one price for everything your home uses, the supplier identifies the car’s charging, by time, by meter or by the charger itself, and bills that slice at the EV rate. Whether it saves you money depends on how much of your charging it captures and what it does to the price of everything else.
Key Takeaways
- An EV tariff prices the car’s charging separately — by time window, charger data or a separate meter.
- Judge it on both sides: the saving on charging against any higher price on the rest of your home’s use.
- Equipment matters — charger-reported deals only work with listed smart chargers.
- The comparison is one multiplication using your own monthly home-charging kilowatt-hours.
How the Supplier Knows It Is the Car
Electricity arrives through one supply, so every EV tariff is built on a way of separating the car’s energy from the home’s. Three methods are in use, and which one a tariff uses decides what equipment you need and what is actually discounted.
| Method | How it works | What to watch |
|---|---|---|
| Time-window rate | A smart meter bills all electricity used in a set cheap window at the lower rate; you schedule the car into it | Everything else running in the window is cheap too — and everything outside it may cost more |
| Charger-reported rate | A compatible smart charger measures and reports the car’s sessions, and only that energy gets the EV rate | Your charger model must be on the supplier’s supported list |
| Separate meter | The charging circuit is metered apart from the house, so the car has its own measured supply | An installation job, not just a tariff switch; the metering options sit behind the same idea |
The Catches That Decide Whether It Pays
- The day rate. Many EV tariffs trade a cheap charging rate for a higher price on the rest of your home’s electricity. A small saving per charge can be eaten by a year of pricier heating and laundry.
- The window. Time-window deals set the cheap hours; a car that must charge at other times — shift work, a second daily fill — misses the rate it was bought for.
- The equipment tie-in. Charger-reported tariffs only work with listed smart chargers and a working data connection; change the charger and the deal can break.
- The terms around it. Check contract length, exit fees and what happens to the rate after any introductory period, the same checks you would make on any energy deal.
Doing the Comparison Honestly
The saving from any EV tariff is one multiplication: the kilowatt-hours you charge at home each month, times the gap between the EV rate and your current rate. Set against it the extra you pay on the rest of your home’s use if the day rate rises. Your home-charging total is on your bill or charger app; what it costs to charge an electric car at home shows how to build that figure. If most of your energy goes into the car, the EV rate usually wins; if the car is a minor load in a busy house, a flat or time-of-use deal can be better.
The Charger Is Part of the Deal
Every method above depends on charging that can be scheduled, measured or reported — the smart-charging functions compared in smart vs non-smart chargers. A wallbox with app scheduling, such as the EVDANCE EV-ACT3204PE 22 kW wallbox (three-phase, tethered Type 2 cable, RFID and app, CE), can hold a car ready and charge inside a tariff window automatically. For a home without a fixed installation, the EVDANCE EV-ACS3210E 32A Type 2 portable charger gives about 7 kW single-phase, IP66 — confirm with the supplier whether a portable unit qualifies for the specific tariff you are considering.
Frequently Asked Questions
Is an EV tariff the same as an off-peak tariff?
Not quite. An off-peak tariff discounts everything used in cheap hours. An EV tariff aims the discount at the car itself — by window, by charger data or by a separate meter — and may leave your other electricity on a standard or higher rate.
Do I need a smart charger for an EV tariff?
For charger-reported deals, yes: a compatible smart charger is how the supplier measures the car. Time-window deals need a smart meter instead. Check the tariff’s equipment list before switching.
Can I get an EV tariff without a home charger?
The deal is about home energy, so you need to charge at home to benefit. Without home charging, your electricity goes through public chargers at their prices, and a home tariff changes nothing.
Related Reading
- How Much Does It Cost to Charge an Electric Car at Home?
- Is Charging an Electric Car Cheaper Than Gas?
- Smart vs Non-Smart EV Chargers: What Installers Actually Want
