How EV electricity rates work
EV electricity tariffs usually give you a cheaper unit rate during a defined overnight charging window. Some plans are smart meter tariffs with day, peak, night, and EV charging rates.
The attraction is simple: if you can move most car charging into the cheapest window, your cost per kilometre can fall sharply compared with daytime electricity.
The lowest EV rate is not always cheapest
A very low EV charging rate can be paired with higher day or peak rates. If the rest of your home uses a lot of electricity during the day or early evening, the total bill can be higher than expected.
The right comparison uses your full household usage plus your expected EV charging usage. That means looking at the car and the home together, not just the headline EV rate.
- Check the EV charging window and how many hours it lasts.
- Compare day, night, and peak rates, not only the EV rate.
- Include the standing charge in the annual cost.
- Estimate how many kWh your car will need at home each year.
- Check whether the plan needs a smart meter or specific charger setup.
Smart meter EV tariff vs night saver
A night saver tariff is usually simpler, with a day rate and a night rate. A smart meter EV tariff can be more targeted, with a special cheap EV window and a separate peak period.
The better option depends on your charging routine and household pattern. EV owners who can charge predictably overnight may benefit from a smart EV window, while homes with broader overnight usage may prefer a wider night rate.
When to review your EV tariff
Review your tariff when your first-year discount is close to ending, when your provider changes rates, or when your driving pattern changes.
It is also worth checking again if you get solar panels, change work routine, add a second EV, or start using more electricity during peak hours.
- Month 10 of a 12-month energy discount.
- After a provider price change notice.
- After buying an EV or changing annual mileage.
- After installing solar panels or a home battery.
- After a few bills show higher peak usage than expected.
Useful sources
- ESB Networks smart meter time bands
- CRU smart meters and services
- SEAI smart meters and tariffs