EV electricity tariff comparison calculator
A cheap-looking night rate does not tell you the whole annual cost. Enter the rates and fixed fees from two offers, then estimate how much of your EV charging can really happen off peak.
€54.00 less per year
How this is calculated
Annual battery energy = annual kilometres × consumption ÷ 100. The calculator divides this by efficiency to estimate energy bought from the wall.
Plan A cost = annual wall energy × flat unit price + the plan's extra annual fee.
Plan B cost uses a weighted unit price: off-peak rate × off-peak share + peak rate × the remaining share. Its extra annual fee is then added.
The result compares EV charging only. It does not calculate the cost of all other household electricity or the value of changing supplier.
Assumptions and limits
- Enter prices from the same basis. Do not compare a tax-inclusive price with a tax-exclusive one, or a bundled price with a price that excludes variable network charges.
- Only enter fixed fees that differ between the two plans. Fees you pay under either plan cancel out in this EV-only comparison.
- The off-peak share is an estimate, not a promise. Check the tariff's exact hours, weekends, seasonal rules and what happens when a charging session crosses a boundary.
- Dynamic tariffs can change more often than a two-rate model. For one, use a cautious average drawn from your own interval data rather than its lowest advertised hour.
Frequently asked questions
What should I put in the off-peak share box?
Use the share you can achieve in normal life, not a perfect week. Check your charging history or compare your usual plug-in times with the tariff window.
Should I include the household standing charge?
Include only the part that changes between the two plans. A charge that is identical under both plans does not change which one is cheaper for the EV.
Why does charging efficiency matter in a tariff comparison?
Your car reports battery-side consumption, while the bill measures energy drawn from the grid. Dividing by efficiency gives a more realistic wall-energy estimate.
Can this choose an electricity supplier for me?
No. It compares the EV-related inputs you provide. Contract terms, price-change rules, export payments, household use and local consumer protections still need a separate review.
