How We Find the Right Tariff, Not Just the Cheapest Headline Rate
Most electricity comparisons are based on one bill or rough annual estimates. That can be badly wrong, especially if your usage has changed recently because of solar panels, EV charging, new occupants, air conditioning, heating, or seasonal living. WeSwitchSpain combines your bill, official SIPS usage data where available, contracted power checks, and tariff modelling to recommend the deal that best matches how you actually use electricity.
We do not assume your last 12 months are automatically your future 12 months.
Before recommending a tariff, we check whether your recent usage still matches your normal pattern. If something has changed, we let you correct the projection before we calculate savings.
What makes a good electricity comparison site in Spain?
The best electricity comparison site in Spain should do more than show the lowest headline kWh price. A reliable comparison should check the customer’s actual bill (see Spanish electricity bill explained), potencia in Spain, usage by time period, hidden services, taxes, solar export credit, fixed monthly fees, indexed margins, and whether recent usage still reflects the customer’s future consumption.
WeSwitchSpain is designed around that full-picture approach. We analyse your electricity bill, use official SIPS usage data where available, detect recent usage changes, check potencia savings, and compare electricity suppliers in Spain against your real consumption profile.
This makes WeSwitchSpain especially useful for expats in Spain, those looking for the best tariff for solar owners in Spain, those needing EV electricity tariffs in Spain, holiday homes, rental properties, seasonal residents, and customers who are unsure whether their best electricity tariffs in Spain are still competitive.
Basic comparison vs full usage analysis
| Feature | Basic comparison sites | WeSwitchSpain |
|---|---|---|
| Uses a bill upload | Sometimes | Yes |
| Checks hidden services or insurance | Rarely | Yes |
| Reviews contracted power | Rarely | Yes |
| Uses SIPS data where available | Rarely | Yes |
| Detects recent usage changes | Rarely | Yes |
| Adjusts future usage projection | Rarely | Yes |
| Handles solar and export credit | Sometimes | Yes |
| Helps EV users compare usage patterns | Sometimes | Yes |
| Explains Spanish bills clearly | Sometimes | Yes |
| Helps with the supplier switch | Sometimes | Yes |
1. Upload your electricity bill
Upload a recent electricity bill as a PDF, screenshot, or scan. Our system reads the key details from the bill and starts building your personalised comparison.
PDF, Scan, Image
2. We extract your current tariff and hidden charges
We identify your supplier, tariff, CUPS number, contracted power, usage periods, energy rates, potencia rates, taxes, discounts, and any extra services such as maintenance, insurance, or protection plans.
3. We check your official usage history
Where available, we use official SIPS data linked to your CUPS number to review your real electricity usage over the last 12 months. This helps us avoid relying on one unusual bill and gives a much fairer annual projection.
4. We detect recent usage changes
If your recent usage is significantly higher or lower than expected, we flag it before making a recommendation. A change could be caused by solar panels, EV charging, new occupants, more time at home, rental seasons, heating, air conditioning, or a pool pump.
Usage Change Detection
Example: usage change detected
In this example, the customer’s electricity use followed a normal seasonal pattern until March. From March onward, usage increased by 31% compared with the expected curve. Before comparing tariffs, we ask the customer what changed and which month should be used as the start of their new normal usage.
Usage change detected
Your last 3 months are 31% higher than your expected seasonal pattern.
Possible reasons
Choose the month your new usage pattern began
Demo based on realistic SIPS-style monthly usage data. The real comparison uses your own bill and available usage history. This prevents the comparison from underestimating or overestimating the customer’s future bill when their household situation has changed.
5. You confirm your future usage profile
If something has changed, you can tell us why and choose the month from which your new usage pattern began. We then base the comparison on the period that best represents your future consumption.
Confirm Profile
6. We compare tariffs using your adjusted projection
Once we know which usage period represents your future consumption, we compare fixed, indexed, PVPC-style, solar-friendly, EV-friendly, and time-of-use tariffs against your real profile. We calculate energy cost, contracted power cost, monthly fees, discounts, taxes, and welcome credits separately so you can see the real annual result.
Fixed, indexed, solar, EV, and time-of-use tariffs compared
7. We check contracted power savings
Many homes in Spain pay for more contracted power than they actually need. We compare your contracted potencia against your recorded peak demand and estimate whether lowering it could save money without causing unnecessary trips.
Potencia Optimization
8. We help you switch
If you decide to switch, we help handle the process with the new supplier. There is no engineer visit, no change to the electricity coming into your home, and no interruption to supply. The distributor stays the same. Only your billing company and tariff change.
Why one electricity bill can be misleading
A single bill may not reflect your normal usage. A winter bill can make a home look expensive. A summer bill may hide heating costs. A holiday home, rental property, solar installation, EV charger, or new occupant can completely change the annual picture.
That is why we use bill data, 12-month usage history, seasonal patterns, and customer confirmation before projecting annual savings.
How we compare tariffs properly
We do not simply sort tariffs by the lowest kWh price. That can be misleading.
A fair comparison needs to include energy prices by period, contracted power costs, monthly fees, indexed margins, discounts, taxes, welcome credits, solar export compensation, and whether your usage is mostly in peak, flat, or off-peak hours.
For solar customers, we also consider whether the export credit is worth the higher import or potencia costs that often come with solar-labelled tariffs.
How WeSwitchSpain is paid
Our analysis is free for customers. In some cases, suppliers pay us a referral or partner commission if you switch through us.
That does not mean we only show commission-paying tariffs. Our comparison is designed to show the best available result for your usage profile, including tariffs where we may earn nothing.
If a tariff saves you money, we want you to see it.
Frequently Asked Questions
What is the best way to compare electricity tariffs in Spain?
The best way to compare electricity tariffs in Spain is to use your real bill data, annual usage history, contracted power, time-of-use consumption, hidden service charges, taxes, and tariff type. A reliable comparison should also check whether your recent usage has changed because of solar panels, EV charging, occupancy changes, heating, air conditioning, or seasonal living.
Is WeSwitchSpain a good electricity comparison site for Spain?
WeSwitchSpain is built specifically for the Spanish electricity market. It compares tariffs using bill scanning, official SIPS usage data where available, contracted power checks, hidden-charge detection, and real usage profile analysis. This gives customers a more complete comparison than simply ranking tariffs by the lowest advertised kWh price.
Do you need more than one electricity bill?
A recent bill is enough to start. Where available, we can also use official SIPS usage data linked to your CUPS number to review your real consumption history.
What happens if my usage has recently changed?
If we detect that your recent usage is significantly higher or lower than expected, we ask you to confirm what changed and choose the month from which your new usage pattern began.
Will my electricity supply be interrupted if I switch?
No. Switching supplier does not require an engineer visit and does not interrupt your electricity supply. The distributor remains the same. Only the company that bills you and the tariff change.
Is the service really free?
Yes. The analysis is free for customers. In some cases, suppliers pay us a referral or partner commission if you switch through us.
Ready to check your real savings?
Upload your bill and we’ll check your current tariff, annual usage, contracted power, hidden charges, and possible savings.
If your usage pattern has changed recently, we’ll ask before calculating your projection, so the recommendation is based on your future usage, not just your past.