Why does my bill vary if the price is always the same?

The price per kWh is fixed, but the total amount on your bill can vary for several reasons:

• Consumption: if you use more or less than the previous month, the amount changes.
• Days in the cycle: billing cycles don't always cover the same number of days, as they depend on when your distributor reads your meter.
• System Adjustment Services: these vary with the market and are billed separately.
• Estimated readings: if the distributor sends an estimated reading, there may be a subsequent adjustment.