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🇵🇹 Solar Calculator Portugal

Enter your monthly electricity bill and city — get solar system size, Fundo Ambiental battery grant, UPAC self-consumption savings, grid injection compensation, and payback period.

Your electricity details
€EUR
Solar system results — Portugal
3 kWp system — 1460 kWh/kWp/yr
Monthly kWh usage364 kWh/mo
Annual solar production4380 kWh/yr
Self-consumption savings€385/yr
Grid injection compensation€158/yr
Total annual benefit€543/yr
System cost (incl. 6% IVA)€3180 – €4770
Total installed cost€3975
Payback period7.3 years
25-year net savings€9603
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How to Use This Calculator

Enter your monthly bill and city

Enter your average monthly electricity bill in Euro from your Portuguese supplier (EDP, Galp, Endesa, or others). The calculator uses a blended retail rate of €0.22/kWh. Select your city — Faro and the Algarve (5.5 PSH) receive the most solar radiation; Porto (4.5 PSH) the least. Portugal overall ranks among Europe's best solar markets, with even Porto outperforming most of Germany.

Set system size and battery

Select your system size in kWp. Portuguese UPAC (autoconsumo) installations are sized up to your contracted power (potência contratada). Enabling the battery toggle adds a home battery and activates the Fundo Ambiental grant of €1,650. Battery storage increases self-consumption from approximately 40% to 65%, greatly improving economics.

UPAC self-consumption mode

Portugal's UPAC (Unidade de Produção para Autoconsumo) regime allows self-consumption with grid injection compensation at the OMIE spot market price (approximately €0.05–0.08/kWh). Since retail electricity costs €0.22/kWh, self-consumption is about 3–4x more valuable than grid injection. Size your system to cover your daytime consumption rather than maximizing export.

The Formula

Monthly kWh = Monthly Bill ÷ €0.22/kWh (blended retail rate) Annual production = kWp × PSH × 365 × 0.80 efficiency Self-consumption = Annual kWh × 40% (no battery) or 65% (with battery) Self-consumption savings = Self-consumed kWh × €0.22/kWh retail Grid injection = Exported kWh × €0.06/kWh (OMIE-based compensation) IVA = 6% reduced rate on solar installation (not 23%) Fundo Ambiental battery grant = €1,650 (apply before installation) Payback = Total cost ÷ Annual benefit

Portugal reduced IVA on solar equipment to 6% (from 23%) in 2023, significantly reducing installation costs. The UPAC decree (DL 153/2014 and subsequent updates) governs self-consumption installations. Systems over 350W must register with DGEG (Direção-Geral de Energia e Geologia). Registration takes 2–4 weeks and requires an installation certificate from a certified electrician. Grid injection compensation is calculated based on the monthly OMIE spot price minus a discount factor.

Example

Ana — Algarve villa, 8kWp, Faro

Ana pays €150/month for her Algarve villa near Faro. She installs an 8kWp UPAC system to maximize self-consumption during the summer tourist season.

Monthly bill€150
City / PSHFaro, 5.5 PSH
System size8 kWp
BatteryNo

Result

Annual production~12,848 kWh/yr
Production per kWp~1,606 kWh/kWp/yr
Self-consumption savings~€1,132/yr
Grid injection income~€462/yr
Total annual benefit~€1,594/yr
System cost (6% IVA)~€8,480–12,720
Payback~6.6 years
25-year net savings~€29,250

Faro's 5.5 PSH gives this system one of the highest production rates in continental Europe. The 6–8 year payback is typical for Portugal. Adding a battery for €4,500 gross (€2,850 after Fundo Ambiental grant) would increase annual benefit to ~€2,000 and total payback to approximately 7.5 years for the full system.

FAQ

Yes — Portugal is one of Europe's best solar markets. Lisbon (5.0 PSH) and Faro (5.5 PSH) produce 1,450–1,600 kWh per kWp per year. Combined with Portugal's €0.20–0.25/kWh retail electricity prices, residential payback periods of 6–8 years are standard. The 6% IVA on solar (reduced from 23% in 2023) and Fundo Ambiental battery grants further improve economics. Over 25 years, a typical 5kWp Lisbon system generates €15,000–25,000 in net savings.
Fundo Ambiental offers a €1,650 non-repayable grant for residential home battery storage systems installed with solar panels. The application must be submitted before installation at fundoambiental.pt. Required documents include: proof of UPAC registration, installer certification, and battery specifications. Grants are awarded subject to fund availability and are processed in the order received. Additional municipal grants (from Câmara Municipal) may also be available depending on your location.
UPAC (Unidade de Produção para Autoconsumo) is Portugal's self-consumption solar regime. Systems over 350W must register with DGEG. The process: (1) Install system with certified electrician. (2) Submit registration to DGEG (2–4 weeks). (3) Your supplier installs a bidirectional meter. (4) You consume solar first; surplus exports to grid and earns OMIE spot price minus discount. Self-consumption is not taxed. Systems up to 1.5kWp are exempt from registration if only used for self-consumption with no grid injection.
Since July 2023, solar panels, inverters, batteries, and installation labor for residential systems have a reduced IVA (VAT) rate of 6% instead of the standard 23%. This reduces a typical 5kWp system cost by approximately €600–1,000. Ensure your installer's invoice clearly states the 6% IVA rate — some installers may incorrectly apply 23%. The reduced rate applies to residential autoconsumo systems under the UPAC regime.
Faro (Algarve, 5.5 PSH) is Portugal's sunniest city — the Algarve consistently ranks among Europe's highest solar irradiance locations. Évora (5.2 PSH) and Lisbon (5.0 PSH) are excellent. Funchal in Madeira (4.8 PSH) benefits from year-round mild temperatures. Coimbra (4.7 PSH) and Porto (4.5 PSH) receive less sun due to Atlantic influence and more cloud cover, but still substantially outperform most of northern Europe.

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