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Installing Solar Panels for Self-Consumption in Portugal

Researched and written with AI tools from official sources. How we make our guides

The production unit tiers, the notification to the energy directorate, the rules on selling surplus to the grid, and what your roof actually earns.

Installing Solar Panels for Self-Consumption in Portugal

Last verified: September 2026.

Who this is for

  • You own a house, or a flat with use of the roof, and want solar panels to cut your electricity bill.
  • You live in a building and want your condominium to install shared solar.
  • You are thinking of a small plug-in balcony kit.

Not for you if: you only want to choose or switch an electricity supplier. Read Setting Up Electricity in Portugal instead.

Updated September 2026. Since 1 July 2026, a simple majority of owners can approve shared solar in a building. From 28 August 2026, systems up to 800 W no longer need a certified installer.

Self-consumption (autoconsumo) means producing your own electricity, usually with rooftop solar panels, and using it in your home. Most households fit a system of 3 to 6 kW. For systems up to 30 kW, your installer sends a free online notice to the energy directorate (DGEG). There is no fee. Panels pay back fastest when you use the power as it is produced. Surplus sent to the grid earns only a few cents per kWh. Up to €1,000 a year of surplus sales is free of income tax.

Which rules apply to your system

The paperwork depends on the installed power of your system, measured in watts (W) or kilowatts (kW). In law your system is a "self-consumption production unit" (UPAC).

Installed powerWhat you needFee
Up to 800 WNo certified installer needed; check with DGEG whether a notice is neededNone
Over 800 W, up to 30 kWA certified installer and prior notice (mera comunicação prévia) to DGEGNone
Over 30 kW, up to 1 MWRegistration and an operating certificateFrom €200, depending on size
Over 1 MWProduction and operating licencesSet separately

Before 28 August 2026 the installer limit was 700 W. Most home rooftop systems fall in the second row.

These rules apply in mainland Portugal. The Azores and Madeira have their own energy departments and procedures.

Plug-in balcony kits

Small kits plug into a wall socket through a micro-inverter. Up to 800 W, you do not need a certified installer. Check with DGEG whether your kit needs a notice before you connect it. Choose a kit with a setting or device that stops it sending power to the grid.

Above 800 W, a kit counts as a normal system. It then needs a certified installer and a notice to DGEG.

Step by step: a rooftop system up to 30 kW

  1. Check your consumption. Log in to the E-Redes customer area. You can see your use in 15-minute intervals. This shows how much power you use in daylight.
  2. Check the roof and permissions. In most places you do not need planning permission. The panels must stay within the roof area and no more than 1 metre above it. Listed buildings and protected areas are an exception. Some councils ask you to notify them before work starts, so check with yours.
  3. Get quotes. Ask at least three installers for written quotes. Compare the system size, the expected yearly production, the equipment warranties, and whether the DGEG notice is included.
  4. Use a qualified installer. Any system over 800 W must be installed by a certified electrical installer or a registered electrical technician. DGEG publishes the list.
  5. The installer submits the prior notice. This goes through the DGEG self-consumption portal (Portal do Autoconsumo e CER). The owner registers as a producer, then the installer or owner files a new notice (Nova MCP). There is no fee up to 30 kW.
  6. Check your meter. Most homes in mainland Portugal already have a smart meter that records power in both directions. If yours is older, the grid operator adapts it. A separate production meter is compulsory for systems over 4 kW.
  7. Decide what to do with surplus. You can give it to the grid for free, store it in a battery, or sign a contract to sell it (see below).

If you live in a flat

Since 1 July 2026, a building with at least two flats can approve rooftop solar by a simple majority of owners. Before, some works needed wider agreement. See How a Condominium (Condomínio) Works in Portugal.

A building can run collective self-consumption (autoconsumo coletivo). One system on the roof is shared among the flats that join. A managing entity, often the condominium, registers the system. It sets how the power is split, for example by fixed shares or by each flat's use. Surplus is sold together.

When shared power passes through the public grid, you pay network charges on it. Eligible projects can get a seven-year exemption from part of those charges, the general economic interest costs (CIEG). DGEG checks eligibility.

Renting out your roof

A new type of contract, the renewable energy use contract (contrato de aproveitamento energético renovável, CAER), started on 1 July 2026. You let a company install and run panels on your roof or land. In return you share the savings or income.

  • The contract must be in writing, and you must get a copy within 30 days.
  • It lasts up to 15 years, renewable once.
  • It must say who pays for installation and upkeep, how income is split, and who owns the equipment at the end.
  • Companies must register with DGEG before offering these contracts. Check the DGEG register first.

A government model contract is still due.

Selling your surplus

Power you do not use can be:

  • given to the grid for free
  • stored in a battery for later
  • sold, under a contract, to a supplier or an aggregator (agregador)

If you sign no contract, the last-resort aggregator can buy it at a price set by the government. The electricity regulator (ERSE) runs a free online tool to compare aggregators' offers alongside suppliers.

Surplus prices are low. Offers are either a fixed price or linked to the Iberian wholesale market price, minus a fee. Either way you usually get a few cents per kWh. That is far less than you pay for power from the grid.

Tax. Up to €1,000 a year from selling surplus is excluded from income tax, for systems up to 1 MW. Above that, you declare the income in your annual return. See Filing Your Annual Income Tax Return (IRS) in Portugal.

What your roof actually earns

Your savings come mainly from power you use yourself, not from what you sell.

How much a system produces. A well-placed system in Portugal typically produces about 1,400 to 1,700 kWh per kW of panels each year. The Algarve and Alentejo are at the top of that range, and the north at the bottom. For your exact roof, use the EU's free solar calculator, PVGIS.

A worked example. These figures are illustrations only. Use your own bill and quote.

  • A 4 kW system in Lisbon produces about 6,000 kWh a year.
  • A household at home in the day uses 40% of it directly: 2,400 kWh.
  • If you pay €0.20 per kWh, including taxes, that saves about €480 a year.
  • The other 3,600 kWh go to the grid. At €0.05 per kWh, that earns about €180.

Using more of your own power changes the result most. Run the dishwasher, washing machine, and water heater in daylight. Charge an electric car at midday if you can.

Size to your daytime use. A system far bigger than your daytime use mostly produces cheap surplus. Size it to what you use while the sun is up.

Batteries. A battery lets you use daytime power in the evening. It adds a lot to the cost and lengthens the payback. It makes most sense if you have frequent power cuts or high evening use.

What it costs

Ask for itemised quotes. Prices vary with roof type, equipment, and access.

VAT. Panels and installation are charged at the standard VAT rate: 23% in mainland Portugal. The temporary 6% rate ended on 30 June 2025.

Grants. The Environmental Fund (Fundo Ambiental) has run household energy grants in rounds. As of September 2026 no general grant for home solar was open. Check its website before you sign, as some schemes do not fund work done before you apply. Some councils offer their own support or property tax (IMI) reductions.

Insurance. Tell your home insurer about the panels. They may need to be added to the building cover. See Getting Home Insurance in Portugal.

Checklist before you sign

  • You have checked your daytime electricity use in the E-Redes area.
  • The installer is on the DGEG list of certified installers.
  • The quote states the power in kW, the expected yearly kWh, and the warranties.
  • The quote includes the DGEG notice and meter arrangements.
  • You know whether you will give, store, or sell your surplus.
  • In a flat, the owners' meeting has approved the work.
  • For a roof rental (CAER), the company is on the DGEG register and you have read the whole contract.

Sources

This guide is written from official Portuguese and EU sources and, for prices and contact details, the providers' own websites.

Last verified September 2026. Rules and fees change; check the official source before acting.

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