Voltmax Energy Solutions au Luxembourg
Klimabonus 523
Photovoltaics (New Regime)
What is Klimabonus 523?
Klimabonus 523 is a public subsidy scheme in Luxembourg supporting the installation of systèmes photovoltaïques (PV) under the new regulatory regime.
The programme is intended for building owners who want to:
produire leur propre électricité grâce à l’énergie solaire,
operate their photovoltaic system primarily in autoconsommation,
reduce dependence on the electricity grid,
contribute to climate protection.
Exigences techniques pour les installations photovoltaïques
To be eligible for Klimabonus 523, the photovoltaic installation must meet the following technical conditions:
Le installed peak output must be at least 2 kWp, with no upper technical limit.
Le maximum subsidy amount of €10,000 is reached with an installed capacity of 15 kWp.
Photovoltaic panels may be:
montés sur le toit,
installés sur la façadeou
intégrés à l’enveloppe du bâtiment.
Les installations sont autorisées sur :
les bâtiments résidentiels, et
les bâtiments non résidentiels.
Les capteurs solaires hybrides produisant à la fois de l’électricité et de l’eau chaude sont également éligibles.
Installations photovoltaïques supplémentaires
Une installation photovoltaïque supplémentaire sur le même toit, la même façade ou la même enveloppe du bâtiment is eligible if:
the injection of electricity into the grid takes place at least two years after la première injection de l’installation précédente.
For apartment buildings with fewer than three residential units, this rule applies individually to each unit, unless:
the applicant already owns an existing photovoltaic installation, or
the applicant belongs to a household that owns such an installation.
Subsidy calculation method
The subsidy amount is calculated using a formula based on the installed peak power (kWp) of the photovoltaic system.
The calculation follows the official formula defined in the regulation and results in a progressively adjusted subsidy amount, avec un plafond de €10,000.
📅 Validité :
applies to signed offers dated until 31 December 2029.
Key conditions for receiving the subsidy
To benefit from Klimabonus 523, the following conditions must be fulfilled:
Le demandeur doit renoncer au tarif d’injection garanti pendant toute la durée de vie de l’installation.
This decision is firm and irrevocable.Une contrat de rachat doit être conclu avec un fournisseur d’électricité pour le surplus d’électricité.
The installation must be operated in autoconsommation.
Collective self-consumption ou
participation in an energy community is also permitted.
Pre-financing option
For photovoltaic installations under Klimabonus 523, a pre-financing option is available.
Key points:
Le pre-financing application must be submitted by the installer via a secure government platform.
Installers must first be listed in the register of eligible installers for the pre-financing procedure.
The beneficiary must be a natural or legal person who owns the building.
The building must include at least one residential unit.
The beneficiary cannot be a company engaged in an activity requiring an establishment authorisation.
In the case of co-ownership, either:
the building manager, or
a designated co-owner
may act as the beneficiary.
Non-eligible projects
The following projects are not eligible for Klimabonus 523:
projects where a deposit exceeding 30% of the final price (including VAT) has already been paid,
installations covered by a leasing contract.
Feed-in tariff without investment subsidy
The option of a guaranteed feed-in tariff remains available.
However, no financial support for installation costs is granted under this option.The level of the feed-in tariff depends on the date de raccordement au réseau of the installation, in accordance with the applicable regulations.
Imposition des revenus photovoltaïques
Pour l’ année fiscale 2022, les revenus des installations de plus de 10 kWp sont imposables.
From the 2023 tax year onwards, les revenus des installations de plus de 30 kWp sont imposables.
How to apply for Klimabonus 523
Without pre-financing
The subsidy application can be submitted after the installation has been completed.
With pre-financing
The subsidy must be applied for by the installer before work begins.
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 523 scheme
The Klimabonus 523 basic subsidy applies to:
installations ordered no later than 31 December 2029, et
applications submitted no later than 31 December 2031.