An electricity bill can seem complex at first glance, yet it rests on a fairly simple structure once the main lines are identified.
In brief
- The bill is made up of a fixed subscription and a variable consumption charge.
- The kWh price directly determines the amount of the variable part.
- The subscribed power (in kW) should match the home’s actual needs.
- Taxes represent a significant share of the total billed.
- Comparing several bills over time helps spot an anomaly.
- Level payments and settlement bills do not work the same way.
The subscription, a fixed part independent of consumption
The subscription is a fixed amount, billed regardless of the quantity of electricity consumed. Its price depends on the subscribed power (expressed in kVA or kW): the higher the power, the more expensive the subscription. A power level poorly matched to the home’s needs can mean paying for a more expensive subscription than necessary.
Consumption, a variable part in kWh
This is the item that varies the most from one bill to another. It corresponds to the electricity actually consumed, multiplied by the kWh price. This is the item most affected by daily energy-saving habits.
As a benchmark, a household consumes on average between 200 and 500 kWh per month, depending on the home’s size, heating type and number of occupants. This figure rises sharply in winter for homes heated with electricity, and stays more stable year-round for those heated with gas or wood.
Level payments or settlement bill, what’s the difference
Most suppliers offer two billing methods. Level payments (mensualisation) mean paying an identical amount each month, calculated from an estimate of annual consumption, then adjusted with an annual settlement bill based on actual consumption. The other option, actual billing, sends a bimonthly or monthly bill calculated directly from the meter reading.
Level payments smooth the budget over the year but can lead to a significant catch-up payment if the initial estimate was too low, for example after a change in habits or the addition of a new energy-hungry appliance in the home.
Taxes and contributions
| Item | Role |
|---|---|
| Subscription | Fixed cost linked to subscribed power |
| Consumption | Variable cost based on kWh used |
| Taxes and contributions | Funding for the grid and public schemes |
Taxes apply on top of the subscription and consumption. They represent a significant share of the total, generally around a third of the bill. This item cannot be negotiated or reduced by the consumer, unlike consumption itself.
Spotting an anomaly on your bill
An unusual increase with no change in usage is worth checking. It can come from a faulty home appliance consuming more than normal, or an incorrect estimate sent by the supplier in the absence of an actual meter reading. Comparing the bill to the same month the previous year gives a reliable benchmark: a gap of more than 20% with no obvious explanation justifies contacting the supplier’s customer service to check the meter reading.
Using your bill to adjust your habits
Understanding the structure of your bill makes it easier to identify the items to prioritise, particularly as part of energy renovation work aimed at durably reducing the home’s consumption. Tracking the kWh consumed month after month, rather than only looking at the total amount, also helps measure the real effect of the energy-saving habits put in place.