# Electricity tariff workbench

Compare two electricity offers using your annual consumption. See what changes after the welcome bonus ends, then save or share your calculation.

https://getecoback.com/en/energy-tariff-workbench.html

Illustrative example — replace with your own figures.

## How the calculation works

Annual recurring cost = Σ(consumption × all-inclusive rate) + fixed charges + contracted power charges. First-year cost subtracts the one-off bonus; B also adds switching costs. Two-year savings = first-year savings + recurring savings. France’s break-even uses recurring costs, excluding bonuses. The shifting scenario stays separate.

## Limits of this comparison

A 365-day model with constant consumption and prices. It does not forecast index-linked prices, model real hourly schedules, solar export, social tariffs or contract eligibility. Verify bonus conditions, term and exit fees with the supplier. A negative bill can result from an unusually large entered bonus. This is arithmetic, not a switch recommendation.

## Sources and official comparison services

- [DE · Verbraucherzentrale](https://www.verbraucherzentrale.de/wissen/energie/preise-tarife-anbieterwechsel/was-sie-bei-bonustarifen-fuer-strom-und-gas-beachten-sollten-6435)
- [FR · Médiateur national de l’énergie](https://www.energie-info.fr/fiche_pratique/comment-comparer-les-offres-delectricite-et-de-gaz-naturel/)
- [FR · Heures creuses](https://www.energie-info.fr/fiche_pratique/bien-utiliser-les-heures-creuses/)
- [ES · CNMC](https://www.cnmc.es/prensa/entiende-tu-factura-20231002)
- [IT · ARERA / Portale Offerte](https://www.arera.it/consumatori/il-portale-offerte)