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Electricity tariff comparison Calculator
Compare two single-rate offers with standing charges and credits. This free electricity tariff comparison calculator shows the calculation and its assumptions so you can compare your own figures.
Your results
Compare two single-rate offers with standing charges and credits.
Calculated outcomes
- First Annual Cost
- €1,379.00
- Second Annual Cost
- €1,426.00
- Cheaper Tariff
- First tariff
Assumptions and estimates
- Method: Period cost = energy × unit rate + days × standing charge − credit. Crossover solves the two cost equations.
- Use prices on the same tax basis and include all recurring charges in standing costs. Credits may have eligibility conditions; time-of-use tariffs need weighted unit rates.
Useful next steps
- Use Compare options to test an alternative side by side.
- Copy, print or download a record of this calculation when you need one.
Reports open your email app addressed to s@s1.ie with the public page address only. Your inputs are never added.
How the electricity tariff comparison calculation works
Period cost = energy × unit rate + days × standing charge − credit. Crossover solves the two cost equations.
Use prices on the same tax basis and include all recurring charges in standing costs. Credits may have eligibility conditions; time-of-use tariffs need weighted unit rates.
Using this calculator
- Enter your own figures in the labelled inputs. Keep the currencies, units and time periods consistent.
- Choose any applicable rate profile, pattern or assumption shown for this tool. Open additional inputs when relevant.
- Review second tariff saving and crossover kwh, then read the stated assumptions and eligibility conditions before using the result.
Worked example
This is a static example using illustrative inputs, not facts about you or today’s date. The displayed eligibility selections and assumptions apply only to this example.
See example inputs
- Energy over comparison period (kWh)
- 4200
- Days in comparison period
- 365
- First unit price (€/kWh)
- 0.3
- First standing charge (€/day)
- 0.6
- First period credit (€)
- 100
- Second unit price (€/kWh)
- 0.27
- Second standing charge (€/day)
- 0.8
- Second period credit (€)
- 0
- Second Tariff Saving
- -€47.00
- Crossover KWh
- 5,766.67 kWh