Solar panels in Portugal

Is solar worth it in Portugal?

Portugal is one of the sunniest countries in Europe, and self-consumption has grown fast. The national regulator, ERSE, reported about 237,000 self-consumers and 1.8 GW of installed self-consumption capacity at the end of 2024, with the number of systems growing by about 44% a year since 2021. According to REN data reported by pv magazine, solar supplied about 19% of the country’s electricity consumption in July 2026, when it was the largest source for the first time.

For a household, the question is how much of the electricity you use while the sun is out. The more you use directly, the better the return, because power you use yourself saves you the full retail price, while surplus you export is paid much less. The European Commission’s PVGIS tool estimates about 1,580 kWh per year for each kWp of panels in Lisbon, 1,510 in Porto and 1,750 in the Algarve, at the best tilt and facing south. A 5 kWp system in Lisbon would therefore produce about 7,900 kWh a year.

How a project works

• Survey. We study your bills, your roof, the shading and your fuse board, usually in one visit and always free.
• Design and quote. We model the production on your roof and give you an itemised written quote with the price, the expected output and the assumptions.
• Filing. After you accept, we make the prior communication to the authorities and any grid operator notice the power requires.
• Installation. Our technicians fit the panels, inverter and cabling, which usually takes one or two days on site.
• Commissioning. We test the system, set up the monitoring app and declare the installation on the DGEG platform.

From the survey to a working system, three to six weeks is typical, and the time is mostly spent on the filing and on the delivery of equipment. Installers publish timings between two and eight weeks, depending on the season and on the grid operator.

Permits and rules

Self-consumption in Portugal is governed by Decreto-Lei 15/2022, which is built around the UPAC, the production unit for self-consumption. In its original text, a system of up to 700 W that does not export to the grid is exempt from prior control. A system above 700 W and up to 30 kW needs a prior communication, and the proof of submission is what allows you to install it. From 30 kW to 1 MW you need a prior registration and a certificate of operation, and above 1 MW or for non-renewable sources a production and operating licence.

The framework was amended in 2026. Decreto-Lei 130/2026 applies from 28 August 2026, and law firms and tax sites report that the exemption for very small systems without export rose from 700 W to 800 W. Law 29/2026, in force from 1 July 2026, also created a new regime for systems up to 1 MW with a term of up to 15 years. Procedures begun before the new dates keep the old rules. We confirm the current text for every project and handle the filings for you.

Under the original text, the grid operator, E-REDES on the mainland, is consulted only when the power you inject would exceed both 50% of your contracted power and 30 kVA on low voltage, and only while the annual injection quota is not used up. For most homes this means no wait for a grid study.

Costs and payback

Our fixed prices, with 23% VAT included, start at €4,900 for 3 kWp, €6,900 for 5 kWp and €9,400 for 7 kWp. A battery adds from €3,900 for 5 kWh and from €6,900 for 10 kWh, and an EV charger installed starts at €1,190. For comparison, Portuguese installers publish prices of about €4,000 to €5,000 for 3 kWp and €6,000 to €9,000 for 5 kWp in 2026, and about €3,500 to €4,500 for a 5 kWh battery. Shop kits sold online with a battery can look much cheaper because they are equipment only, without installation, design or the filings.

A worked example: a 5 kWp system in Lisbon produces about 7,900 kWh a year. If you use 60% directly at about €0.17 per kWh, you save about €800 a year, and the surplus sold at a low market-linked price adds roughly another €100. On a €6,900 price, that is a payback of about seven to eight years. A smaller share of daytime use makes it longer, and a higher electricity price makes it shorter. Installers’ claims of four-year paybacks are best treated with caution.

On incentives, the reduced 6% VAT rate on solar panels ran from July 2022 to June 2025 and was not renewed, and as far as we found, it has not come back. The Vale Eficiência household voucher programme is being wound down, and no household solar grant was open when we last checked in October 2026. There is no specific solar deduction in the personal income tax return. We do not rely on grants in our quotes, and we tell you if a notice opens.

Surplus and selling power

Portugal has no net-metering scheme that credits exported power against your bill. The surplus can be injected without payment or sold under a contract with an authorised buyer, at a price the buyer sets, which is generally well below the price you pay for electricity. ERSE data show that about 27% of the output of self-consumption systems was injected into the grid in 2024, and 43% of that was sold.

The practical rule is to size the system for your own consumption and to move your use into the daytime, for example by running the dishwasher, the heat pump or the car charger at midday. A battery stores some of the surplus for the evening. Income from selling surplus is reported to be excluded from income tax up to €1,000 a year for systems up to 1 MW, and we suggest you confirm this with your accountant.

Apartments and condominiums

A flat owner can install panels on a private terrace or balcony. For panels in a common area, the framework requires you to give the building administration at least 60 days’ notice. The administration has 20 days to object, and only on four grounds: the architecture of the building, a disproportionate restriction of other owners’ rights, blocked access and safety. An objection can be taken to the owners’ assembly, called within 30 days, and if the administration does not reply, the prior communication is sufficient. Tax and law sites report that since 1 July 2026 a collective system for the building can be approved by a simple majority of owners, which we check for each case.

Collective self-consumption is also possible, where a system supplies several consumption units, and renewable energy communities are recognised in the law. As a general rule, the production and the consumption must be close, within 2 km on low voltage or on the same transformer.

Who may install

A system above 700 W must be installed by a licensed installation entity for private electrical installations, or by a responsible technician for electrical installations, under Law 14/2015 and Decreto-Lei 96/2017. The installer must check that the system is exempt, registered or licensed, and must declare each system on the DGEG platform. The only exception is certified plug-and-play equipment under 1.5 kW. Our company is a licensed installation entity, and our responsible technician signs every project.

Ask any installer for the company’s recognition document and the technician’s number, and ask to see the declaration for a recent project. We could not find an official public list that you can search to check an installer, so asking for the documents is the practical test. Watch out for door-to-door sellers, pressure to sign on the day and requests for a cash deposit. If you sign a contract away from the seller’s premises, you normally have 14 days to withdraw, and a new product carries at least three years of legal guarantee in Portugal under consumer law.

Questions to ask any installer

• Are you a licensed installation entity, and what is the recognition number?
• Who is the responsible technician, and can I see the declaration for a recent project?
• Which panels, inverter and battery brands will you use, and what are their warranties?
• What is the expected annual output on my roof, and what assumptions does it use?
• What does the price include: the design, the filings, the monitoring, the scaffolding and the DGEG declaration?
• What happens if the inverter fails after the warranty, and who do I call?

This guide is general information and is not legal, tax or engineering advice. Rules change, and a survey of your roof and your bills is needed before any system is sized.