Photo by Seattle Municipal Archives via Flickr (CC BY 2.0)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.
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.
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.
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.
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.