If someone has offered you ‘free’ solar panels for your villa in Spain, or promised that your electricity bill will disappear, this is for you. Not every offer like that is a scam. But very few of them mean what they appear to mean, and when you are dealing with a contract in Spanish, a system you will live with for 25 years and an installer you may never see again once you fly home, the small print matters far more than the headline.
We will not talk about specific companies, only about practices. Below are the six promises we see most often in the quotes that villa owners across the Region of Murcia and the southern Costa Blanca show us, what each one usually hides, and what to ask for before you sign.
1.1. Solar panels at zero cost
Nobody gives away a solar installation. In practice, ‘zero cost’ almost always means zero upfront, not zero overall. You pay through monthly instalments, either a finance agreement or a rental (sometimes called renting or leasing) of the system.
That can suit some owners. The problem starts when the monthly fee is presented as something that pays for itself
from your savings. That is only true if your real consumption matches the system, and nobody can promise that without studying your bills.
Before accepting a ‘free’ offer, get these answers in writing:
check The total of all payments to the end of the contract, not just the monthly figure. check Who owns the panels during the contract and when it ends. check What happens if you sell the villa, want to end the contract early or change electricity supplier. A system you do not own can complicate a sale. check Who pays for maintenance and repairs, and how quickly someone actually comes out.
If any of these is vague in the contract, it is vague in real life too.
2.2. Your electricity bill will drop to zero
Spanish law is quite specific here. Under the most common arrangement for homes, simplified surplus compensation (compensación simplificada), the energy you export is credited against your bill, but with a cap. Article 14 of Royal Decree 244/2019 states that the value of your exported energy can never exceed the value of the energy you take from the grid in the billing period, which cannot be longer than one month.
What that means for you: exports reduce the energy part of your bill, but not the standing charge for your contracted power, the meter rental or taxes. So with simplified compensation your bill can fall a long way, but it does not disappear. And, as a rule, unused credit from one month does not roll over to the next.
Some electricity suppliers offer ways to ‘bank’ that surplus, often called virtual batteries. They are not good or bad by definition: check whether there is a monthly fee, a minimum term, and what value they give each kWh. If you want to store energy for the evening, read is a solar battery worth it if you already have panels?
3.3. Guaranteed 70% savings
A fixed savings percentage, given before anyone has looked at your bills, is a brochure figure. What you save depends on how much electricity you use, when you use it and what you pay for it.
This matters even more for holiday homes. Take a villa in Campoamor lived in all year, with a pool and daytime air conditioning: the panels produce exactly when the house uses most, and savings can be significant. The same villa used only in summer and the odd long weekend will export most of its production, which is usually valued below what you pay to buy electricity. Same roof, very different numbers.
A serious offer gives you ranges based on your consumption and explains the assumptions behind them. For a realistic picture, see how much a villa on the Costa Blanca really saves with solar.
4.4. The more panels, the better
More panels means more production, yes. But anything you do not use at home goes to the grid, usually valued lower and, as above, capped. Spain’s main consumer association, OCU, recommends in its solar panel analysis that you base the study on your actual consumption pattern and avoid oversizing.
The right system is the one that fits how you use the house, with room to grow if you plan an EV, a heat pump or spending more months in Spain. Not the one that squeezes the most panels onto the roof.
5.5. We handle the grant, so it’s almost free
Incentives exist, but in 2026 they are mainly income tax deductions and local council discounts, and how much you benefit depends on your tax residency, whether the villa is your main home and which council you are in. For non-residents in particular, some deductions may not apply at all. No installer can honestly promise you it’s almost free
.
What a good installer can do is give you complete paperwork (invoices, the installation certificate, legal registration) so your tax adviser can claim whatever you are entitled to. For more on being a non-resident owner, read our guide to going solar in Spain when you are not a resident.
6.6. Sign today, the offer ends tomorrow
Pressure is a poor sign in a purchase this size, and even more so if the contract is in a language you do not read comfortably. Take the time to compare, ask questions and, if needed, have the contract translated.
It also helps to know that, in general, Spanish consumer law gives you a cooling-off period (derecho de desistimiento) for contracts signed away from the seller’s premises, for example at your home. According to the public service Consumo Responde, it is 14 calendar days, or 30 days if the sale took place during a home visit you did not request, and you do not have to give a reason. There are nuances depending on the case, so if in doubt, check with a consumer office.
7.Bonus: No need for a visit, a photo of the roof is enough
A photo is fine for a first idea, not for a firm quote. A site survey is where the things that actually shape the system become clear: the condition and waterproofing of the roof, afternoon shading, the real orientation, cable routes, the state of the consumer unit and where the inverter (and a battery, if you want one) will go.
It is also where you find out whether anything in the existing wiring needs updating before the system can be legalised. Every self-consumption system in Spain must be registered with its official electrical certificate, as we explain on our electrical certificates page. Skipping the visit does not save time; it just moves the problems to later, often when you are back home.
8.‘Too good to be true’ vs a serious offer
| What to look for | Too good to be true | Serious offer |
|---|---|---|
| Site survey before quoting | close | check |
| Savings as ranges based on your bills | close | check |
| Total cost in writing (not just the instalment) | close | check |
| Brand and model of panels, inverter and battery | close | check |
| Legalisation and certificate included | close | check |
| Written warranties and a named contact if something fails | close | check |
| Time to think it over without pressure | close | check |
9.Before you sign, ask for this
- A study based on your actual bills, not an area average.
- The total cost of the system and, if paid in instalments, the total you will pay.
- The brand and model of every component, so you can compare like for like.
- What is included: mounting, cabling, protections, legalisation and remote monitoring (essential if you spend months abroad).
- Written warranties for the equipment and the workmanship, and who handles after-sales.
- An installation carried out and certified by a licensed installer (instalador habilitado).
- A contract and explanations you fully understand, in English if you need it.
With this in hand, comparing quotes becomes much easier. And if a company will not give you something on this list, that is already an answer.
10.Frequently asked questions
10.1.Are ‘free’ solar panels in Spain a scam?
Not necessarily. ‘Free’ or ‘zero cost’ usually means nothing upfront and monthly payments through finance or a rental agreement. It can suit some owners, but check the total you will pay, who owns the panels and what happens if you sell the villa or want to cancel.
10.2.Can solar panels bring my electricity bill down to zero in Spain?
Not entirely under simplified surplus compensation. Exported energy offsets the energy you use in each billing month, but not the standing charge, meter rental or taxes, according to Royal Decree 244/2019. The bill can fall a lot, but it does not disappear.
10.3.How much will I save with solar on my holiday home?
It depends on how many months you spend there, when you use electricity and your tariff. Be wary of fixed percentages given without seeing your bills. A serious installer gives you ranges and explains the assumptions.
10.4.Can I cancel a solar contract I signed at home?
In general, contracts signed away from the seller’s premises carry a 14-day cooling-off period, or 30 days if the sale came from an unsolicited home visit, with no reason required. If you are unsure about your case, check with a Spanish consumer office.
10.5.Do I need to be in Spain for the site survey?
It helps, but it is not always essential. Many owners arrange access through a neighbour or property manager. What matters is that someone actually inspects the roof and the electrics before you receive a firm quote.
The information in this article was checked against official sources at the time of publication. Regulations change and every case is different: always review the specific terms of your contract.
11.Get a second opinion before you commit
If you already have a quote on the table and want an independent look at it, or you would rather start from scratch with real numbers, we will visit, review your bills and your roof, and tell you plainly what makes sense for your villa and what does not. In English, and with no brochure promises.
It is free and with no obligation.