Solar panels in Mazarrón: what foreign homeowners need to know

Council tax discounts in Mazarrón

Spanish councils may reduce two taxes for solar self-consumption: the IBI (Impuesto sobre Bienes Inmuebles, the annual property tax, by up to 50% under national law) and the ICIO (Impuesto sobre Construcciones, Instalaciones y Obras, paid once on the works, by up to 95%). Both are optional for each council, which is why the figures differ from town to town. Our comparison of 21 cities (in Spanish) shows how widely they vary.

IBI: 25% of the IBI quota for 4 tax periods (from 2026)

• Article 5.5 of the IBI ordinance in force since 1 January 2026 gives a 25% bonus on the IBI quota for dwellings with solar thermal or electric systems for self-consumption, limited to four tax periods counted from the one after the bonus is granted.
• The system must be sized to cover all the needs of the dwellings of the building where it is installed. The bonus is incompatible with other tax benefits on the same property, and must be requested before the tax accrues, with a certificate from a competent technician stating the installation date and that the conditions are met.
• A transitional rule cancels solar bonuses that had already been enjoyed for more than four periods under the old text.

ICIO: 45% on the electric solar part (older consolidated text; confirm)

• The ICIO ordinance on the council website (article 8.3) gives a 45% bonus to works that incorporate electric solar systems for self-consumption, provided the equipment is homologated and sized to cover the dwellings’ needs, requested when you apply for the works licence.
• This is the consolidated text on the council website; a 2015 modification changed other parts of the same ordinance. We could not confirm whether it has been modified again, so check the current figure when you apply.

How much a system produces in Mazarrón

PVGIS, the free tool of the European Commission’s Joint Research Centre, gives 1,661 kWh per year for each kWp installed at Mazarrón town (37.599, -1.315), with panels facing south at the optimal tilt (35°), 14% system losses and 2113 kWh/m² of yearly irradiation on the panels. A 5 kWp system would therefore produce roughly 8,305 kWh a year. A roof that does not face south, or that is shaded, will produce less: your installer should model your actual roof.

Source: PVGIS v5.2 (JRC, European Commission), consulted 3 October 2026, coordinates 37.5994, -1.3149, elevation 65 m. Use the calculator to turn this into euros with your own tariff.

Licence and paperwork in Mazarrón

Request the IBI bonus before the tax accrues (on 1 January) and keep the installer’s certificate showing the date of installation: the ordinance requires it.

The steps that are the same everywhere in Spain (registering the installation, the surplus-energy contract, what changes on your bill) are explained in our guide to solar panels in Spain for foreign homeowners.

Particularities for Mazarrón

Camposol is a large residential area of villas, many owned by foreign residents. Check whether your plot sits within a residents’ community or an urbanisation association with rules about roofs before you sign a contract.

The “sized to cover all the needs of the dwelling” wording is unusual. Ask your installer to document the consumption they used for sizing, in case the council asks for it.

Camposol, Puerto de Mazarrón, Bolnuevo and Mazarrón town are all inside the municipality and follow the same ordinances.

Frequently asked questions

Sources

• BORM no. 294, 22-12-2025, announcement 6246: IBI ordinance of Mazarrón (article 5.5)
• ICIO ordinance of Mazarrón (council website, article 8)
• BORM no. 301, 31-12-2015: 2015 modification of the ICIO ordinance

All consulted on 2–3 October 2026. PVGIS: re.jrc.ec.europa.eu. Ordinances change, usually in the autumn for the following year: confirm the figure with the council before you sign.

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