OfertEnergía · Rough estimate

Solar calculator

Work out how much electricity panels on your roof would produce and how much you could save, with free official data (the European Commission's PVGIS and Red Eléctrica prices). It is a rough estimate: the installer confirms it.

Province

Optional. Click the corners of the roof to draw it; we work out the m² and the location. The map loads from OpenStreetMap only if you press the button.

Roof area (m²)

…or the power you want to install (kWp)

Roof tilt (degrees)

Orientation

Monthly consumption (kWh)

It is on your bill. If you don't know, enter the bill amount.

…or your average bill (€/month)

A photo of your bill? Automatic bill reading will come later; for now enter the kWh or the amount.

Your energy price (€/kWh, optional)

If empty we use Red Eléctrica's recent average PVPC price.

Battery Price of a quote you have (€, VAT incl., optional)

Only to work out the payback time. We do not show average prices.

Result (rough estimate)

Power considered
Production per year
Self-consumption (of what you produce)
Share of your consumption covered
Estimated saving per year
Payback at that price
CO₂ avoided per year

Month	Production (kWh)	Self-consumption (kWh)	Surplus (kWh)

Assumptions

Sources

Get quotes from installers with these data

Grants and tax rebates (official sources)

IBI property tax: up to 50% rebate (if your town hall offers it)
The Local Finance Act (art. 74.5) lets each town hall reduce the IBI property tax by up to 50% for buildings with solar energy installations. Whether it exists, how much and for how many years is set by your municipality's tax ordinance.
https://www.boe.es/buscar/act.php?id=BOE-A-2004-4214 · Checked on 2026-11-03
ICIO building-works tax: up to 95% rebate (if your town hall offers it)
The same act (art. 103.2.b) allows a rebate of up to 95% of the tax on construction, installations and works when solar energy systems are installed. Each town hall decides in its ordinance.
https://www.boe.es/buscar/act.php?id=BOE-A-2004-4214 · Checked on 2026-11-03
Income tax: deduction for energy-efficiency works
Additional provision 50 of the Income Tax Act allows deducting 20% (max. base €5,000 a year) or 40% (max. base €7,500 a year) of amounts paid for works on the home until 31 December 2026, and 60% for energy refurbishment of residential buildings until 31 December 2027, if energy performance certificates before and after prove the required improvement. Check the exact conditions in the law or with your adviser.
https://www.boe.es/buscar/act.php?id=BOE-A-2006-20764 · Checked on 2026-11-03

Grants from your region and town hall change often. We only show those we have checked at the official source; see your region's energy website and your municipality's tax ordinance.