Electricity saving calculator: which appliance takes your bill
The electricity bill has two parts that are saved in different ways: energy, which depends on what the appliances use, and contracted power, which you pay even when the house is empty. This page lets you do both sums with your own figures.
The calculator
| Appliance | Watts | Hours/day | Days/year | Per year |
|---|---|---|---|---|
| Pool pump | 0 | |||
| Dehumidifier | 0 | |||
| Air conditioning | 0 | |||
| Electric water heater | 0 | |||
| Appliances on standby | 0 |
These appliances cost you a year0
Saving from lowering the power, a year0
The rows are examples: change the watts, hours and days to your own (the watts are on the appliance label). The pool pump follows Repsol's example (1 kW, 8 hours); the dehumidifier, the Orbegozo DH 1655 data sheet (230 W). The price per kW is only the 2026 peak period network toll published in the BOE (23.32 € per kW a year): your supplier charges more, adding the off peak period, levies and its margin. Enter the one on your bill and the saving will come out higher.
Where a household's electricity goes
IDAE publishes the breakdown of Spanish household electricity use by purpose. These are the main ones in 2024 (percentages worked out from its data file):
| Use | Share of electricity use |
|---|---|
| Other equipment | 17.9 % |
| Fridges | 12.9 % |
| Lighting | 9.6 % |
| Cooking | 9.5 % |
| Heating | 8.0 % |
| Standby | 6.3 % |
| Hot water | 5.9 % |
| Air conditioning | 5.3 % |
| Freezers | 3.0 % |
This is the Spanish average. In a Costa Blanca house with a pool and air conditioning the split changes a lot: that is why the calculator works with your appliances, not the average.
Contracted power
It is paid per kW, every day, whether you use the house or not. In 2026, the peak period network toll alone is 23.32 € per kW a year according to the BOE, and your supplier adds the off peak period, levies and its margin. If you have 5.75 kW and never go above 4, lowering the power is a guaranteed saving. Your distribution company shows the real maximum you used each month in its customer area.
The price per kWh
According to OCU, the average PVPC price, the regulated tariff, was about 0.22 €/kWh in August 2026. On the free market it depends on your contract: enter the one on your bill in the calculator.
Three savings that cost nothing
- Adjust the pool pump hours to the season.
- Switch off the electric water heater when the house is left empty.
- Air conditioning at 26 °C or more in summer: each degree counts for around 7 %, according to IDAE.
Where the figures come from
Prices checked in September 2026. They change: take them as an order of magnitude and always ask for the final price in writing.
Questions about this
Where do I find an appliance's watts?
Does lowering the power cost anything?
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