Klimabonus 524

Home battery – new regime

What is Klimabonus 524?

Klimabonus 524 is a public subsidy scheme in Luxembourg supporting the installation of home battery storage systems connected to a l’installation photovoltaïque.

A home battery allows you to store solar electricity produced during the day and use it later — in the evening or during periods of low sunlight. This helps increase l’autoconsommation, improve indépendance énergétique, and reduce reliance on the electricity grid.

Technical requirements for home batteries

To be eligible for Klimabonus 524, the home battery must meet the following technical conditions:

Le usable storage capacity must be at least 2 kWh, with no upper limit.
In an apartment building, the subsidy is granted only if the total power of the photovoltaic installation exceeds 1.5 kWp per private residential unit.
An additional home battery is eligible for a subsidy only five years after the purchase of the previous battery, based on the invoice date.

Conditions for receiving the subsidy

The Klimabonus 524 subsidy is subject to the following conditions:

The battery must be directly linked to a photovoltaic installation.
Electric vehicles are not considered home batteries under this subsidy scheme and are therefore not eligible.

How to apply for Klimabonus 524

Without pre-financing
- The subsidy application can be submitted after the battery installation has been completed.

Majoration sociale Klimabonus

Les ménages éligibles peuvent demander une majoration sociale de l’aide après réception de la décision accordant l’aide Klimabonus.

Applications must be submitted to:

Guichet unique des aides au logement
11, rue de Hollerich
L-1741 Luxembourg
Grand-Duché de Luxembourg
📧 guichet@ml.etat.lu
📞 (+352) 8002 10 10

Formulaires de demande nécessaires

Klimabonus – aide de base

“Demande d’une aide dans le cadre du paquet banque climatique et logement durable – DEPA-2026 – Personne physique”
(ou le formulaire pour les Personnes morales)
“Installation photovoltaïque – Fiche PHOT-2026”

Majoration sociale Klimabonus

“Demande en obtention d’une aide à l’assainissement énergétique (F3)”
“Déclaration relative à la composition de la communauté domestique (L/A21)”
“Déclaration sur l’honneur – Acquisition (A92)”

Validity of the Klimabonus 524 scheme

The Klimabonus 524 basic subsidy applies to:

factures datées entre le 5 January 2026 and 31 December 2029.

Les règles d’aide présentées sur cette page reposent sur le cadre officiel défini par Klima Agence.
La réglementation pouvant évoluer, Klima Agence reste l’autorité de référence pour la validation finale.
Nous suivons ses dernières lignes directrices afin de fournir à nos clients des informations exactes et fiables tout au long des démarches.

Our experts help you assess the right battery capacity, check compatibility with your photovoltaic system, and clearly explain the Klimabonus 524 subsidy conditions. Get practical guidance, clear answers and support with the next steps free of charge and without obligation.

FAQ – Questions fréquentes

What does Klimabonus 524 support?

Klimabonus 524 supports the installation of home battery storage systems connected to a photovoltaic installation, helping homeowners increase self-consumption of solar energy.

Is a photovoltaic system required?

Yes. The subsidy applies only to batteries linked to a photovoltaic installation.

What is the minimum battery size?

The battery must have a usable capacity of at least 2 kWh. There is no upper limit for the storage capacity.

Are electric vehicles considered home batteries?

No. Electric vehicles are not considered home batteries and are not eligible under this subsidy scheme.

Are home batteries subsidised in apartment buildings?

Yes, but only if the total power of the photovoltaic installation exceeds 1.5 kWp per private residential unit.

Quand puis-je demander l’aide ?

The subsidy application can be submitted after the battery installation has been completed.

Is there a social top-up subsidy available?

Yes. Eligible households may apply for a Social Top-Up Klimabonus after receiving the decision granting the Klimabonus subsidy.

Who decides on the subsidy approval?

Final eligibility and approval are determined by the competent public authority, in accordance with the applicable regulations.

What documents are required for the application?

The application requires: the official Klimabonus application form (DEPA-2026), the annex form “Installation photovoltaïque – Fiche PHOT-2026”, and, if applicable, additional forms for the social top-up subsidy.