Calculator
Time-of-use tariff comparison
Split annual consumption across peak, off-peak and night bands, then rank up to three tariffs.
Your situation
kWh/yr
%
%
%
Tariffs (up to 3)
€/kWh
€/kWh
€/kWh
€/day
€/kWh
€/kWh
€/kWh
€/day
€/kWh
€/kWh
€/kWh
€/day
Estimate only. Based on the assumptions you entered. Get a site-specific survey before spending money.
Cheapest tariff
Two-rate
€1,119 / yr
Saving vs. most expensive
€202
vs Flat standard
Ranked annual cost
- #1 Two-rateenergy €944 + standing €175 = €1,119
- #2 EV / night saverenergy €952 + standing €183 = €1,135
- #3 Flat standardenergy €1,120 + standing €201 = €1,321
Formula with your numbers
peak_kWh = 4000 × 40% = 1,600
off_kWh = 4000 × 35% = 1,400
night_kWh = 4000 × 25% = 1,000
Two-rate: Σ(band_kWh × rate) + 0.48 × 365 = €1,119
Frequently asked questions
Who do time-of-use tariffs suit?+
Households that can shift EV charging, immersion heaters, dishwashers or heat-pump tanks into cheap windows. If most use is evening peak and you cannot shift, a flat rate can win.