Fixed vs variable electricity tariffs in Spain
Electricity tariffs in Spain are usually fixed or variable.
Understanding the difference helps you choose a tariff that matches your risk tolerance and usage habits.
What a fixed electricity tariff means
A fixed tariff charges the same price per kWh for a set period.
Benefits
- Predictable bills
- Protection from price swings
Drawbacks
- Missing out on cheaper periods
- Less flexibility
What a variable electricity tariff means
A variable tariff changes price based on market conditions.
Benefits
- Access to cheaper energy when prices fall
- Better alignment with solar-heavy periods
Drawbacks
- Less predictability
- Prices can rise unexpectedly
Which option suits you best
The best choice depends on:
- How flexible your usage is
- Whether you use electricity during the day
- Your tolerance for price changes
Analysing your bill helps determine which option suits you.
To understand why bills rise and fall, it helps to know how electricity prices work in Spain. Read our full guide.
Unsure which plan is right for you?
Upload your electricity bill and we will advise which tariff type fits your usage.
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Frequently Asked Questions
Are fixed tariffs safer?
They offer more stability because your price per kWh does not change, protecting you from sudden market spikes. However, they can be more expensive if market prices drop significantly.
Do variable tariffs always save money?
Not always. While they allow you to benefit from low market prices (often on weekends or sunny days), you are also exposed to high prices during peak demand or low renewable generation periods.
Can I switch between tariff types?
Yes, you can usually switch. However, some fixed tariffs have a minimum contract period (permanencia) which might incur a penalty if you leave early. Variable tariffs rarely have penalties.