Klimabonus 522
Photovoltaics and Home Battery (Old Regime)
What is Klimabonus 522?
Klimabonus 522 is a public subsidy scheme in Luxembourg supporting the installation of photovoltaic (PV) systems, with or without electricity storage, under the previous regulatory framework.
The subsidy is designed for property owners who want to:
produce their own electricity using solar energy,
reduce reliance on the public grid,
contribute to climate protection,
benefit from financial support for their photovoltaic investment.
Technical requirements for photovoltaic systems
To be eligible for Klimabonus 522, the photovoltaic installation must meet the following conditions:
The peak output of the system must not exceed 30 kWp.
PV panels may be:
mounted on the roof,
installed on the façade, or
integrated into the building envelope.
Installations are allowed on:
residential buildings, and
non-residential buildings.
Hybrid solar collectors producing both electricity and hot water are also eligible.
Subsidy options – two possible models
Two subsidy options are available. The applicant must choose one of them.
Option 1: Feed-in mode with guaranteed feed-in tariff
Investment grant: 20% of the eligible investment.
Maximum subsidy: 500 €/kWp.
The installation operates in feed-in mode with a state-guaranteed feed-in tariff.
Self-consumption is still possible under this option.
The feed-in tariff is guaranteed for 15 years.
The exact tariff level depends on the grid connection date of the installation.
📅 Validity:
invoices dated between 1 January 2022 and 31 December 2026,
the installation must have been ordered no later than 4 March 2026.
Option 2: Self-consumption mode (no guaranteed feed-in tariff)
Investment grant: 50% of the eligible investment.
Maximum subsidy: 1,250 €/kWp.
The system operates in self-consumption mode.
The applicant must renounce the guaranteed feed-in tariff for the entire lifetime of the installation.
This renunciation is firm and irreversible.
A buy-back contract must be concluded with an electricity supplier for surplus electricity.
In most cases, this involves:
individual or collective self-consumption, or
participation in an energy community.
📅 Validity:
invoices dated between 1 January 2022 and 31 December 2026,
order placed no later than 4 March 2026.
Increased subsidy for specific installations
For photovoltaic installations:
ordered between 1 January 2023 and 30 September 2024, and
invoiced by 31 December 2026,
an increased investment subsidy of 62.5% applies if the guaranteed feed-in tariff is waived.
Maximum subsidy: 1,562.5 €/kWp.
Subsidy for home battery storage
Electricity storage (net capacity) is eligible for a subsidy under the following conditions:
Single-family homes
PV system output: more than 4 kWp,
storage capacity: up to 1.5 kWh per kWp,
with a maximum of 12 kWh.
Apartment buildings
PV system output: more than 1.5 kWp per residential unit,
storage capacity: up to 1.5 kWh per kWp,
with a maximum of 9 kWh per residential unit.
Non-residential buildings
storage capacity: up to 1 kWh per kWp.
Taxation of photovoltaic income
For the 2022 tax year, income from installations above 10 kWp is taxable.
For the 2023 tax year, income from installations above 30 kWp is taxable.
Additional photovoltaic installations
An additional photovoltaic installation on the same roof, façade or building envelope is eligible for subsidy if:
the electricity injection into the grid takes place at least 2 years after the first injection of the previous installation.
How to apply for Klimabonus 522
The subsidy application can be submitted after the installation has been completed.
Social Top-Up Klimabonus
Eligible households may apply for a social top-up subsidy after receiving the decision granting the Klimabonus subsidy.
Applications must be submitted to the Single Point of Contact for Housing Assistance:
Single point of contact for housing assistance
11, rue de Hollerich
L-1741 Luxembourg
Grand Duchy of Luxembourg
📧 guichet@ml.etat.lu
📞 (+352) 8002 10 10
Required application forms
Klimabonus – basic subsidy
“Demande d’une aide dans le cadre du PAQUET BANQUE CLIMATIQUE ET LOGEMENT DURABLE – DEPA-2022 – Personne physique”
(or the form for Personnes morales)“Installation photovoltaïque – Fiche annexe: PHOT-2022”
Social Top-Up 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 522 scheme
The Klimabonus 522 basic subsidy applies to:
invoices dated between 1 January 2022 and 31 December 2026,
installations ordered no later than 4 March 2026.