Solar panel subsidies in Luxembourg 2026: up to 10.000 € from the Klimabonus

How much the state pays

For a system below 15 kWp, the aid is P × (1.155 − 1.155/35 × P) euros, where P is the peak power in kW to two decimals. From 15 kWp the aid is fixed at 10.000 €. The amount grows more slowly with each extra kWp, so the aid per kWp is highest on small systems.

Battery

For a battery below 9 kWh of usable capacity, the aid is Q × (500 − 500/18 × Q) euros, where Q is the usable capacity in kWh. From 9 kWh it is fixed at 2.250 €.

A home energy management system that steers the panels, battery, heat pump or charging station gets 500 €, for invoices from 1 October 2026.

Conditions

• Self-consumption: the system runs in self-consumption mode and you expressly give up the regulated feed-in tariff. You can still feed surplus electricity into the grid and sell it at market price.
• Size: at least 2 kWp. In an apartment building, more than 1,5 kWp per private unit.
• Mounting: on the roof or facade of the building, or built into the building envelope. Hybrid collectors that produce hot water and electricity count as solar panels.
• Battery: at least 2 kWh, connected to a solar system in self-consumption. A battery for an existing system is eligible too. A further battery for the same system is only eligible 5 years after the last subsidised one.
• Dates: the invoice must be dated between 4 January 2026 and 31 December 2029, or up to 31 December 2031 if the system was ordered by the end of 2029. Applications close on 31 December 2031.

1. 01Compare quotesCompare the peak power in kWp, the battery’s usable capacity in kWh, the mounting, and how the system is set up for self-consumption.
2. 02Sign the orderIf you want the aid deducted from the invoice, do not pay a deposit of more than 30 % of the final price including VAT.
3. 03InstallationThe panels go on the roof or facade, or are built into the building envelope. The invoice must be dated between 4 January 2026 and 31 December 2029.
4. 04AidEither the installer deducts it from the invoice (pre-financing), or you apply to the Guichet unique des aides au logement after the invoice, by 31 December 2031 at the latest.

Pre-financing: the aid deducted from the invoice

Pre-financing is optional. A company listed in the register of intermediary applicants files the application through MyGuichet.lu and passes the full aid on to you as a lower price. The current pre-financing scheme moves into the Klimabonus 2026 on 1 January 2027. It does not apply to a system financed by leasing, when you paid a deposit of more than 30 % of the final price including VAT, or to a battery added to an existing system: those go through the standard application after the invoice. You cannot file two applications for the same system.

Commune top-ups

Many communes add their own aid for solar panels, either a share of the state aid or a fixed amount, with a cap that differs from one commune to the next. Far fewer communes pay anything for a battery. Many regulations cap state and commune aid together at 100 % of the cost, and most expect the commune application within six to twelve months of the state's decision. Klima-Agence's aid simulator shows the amounts for your commune.

3 % VAT

The supply and installation of solar panels on private housing are directly subject to the super-reduced 3 % VAT rate, so the installer invoices 3 % from the start.

What to ask for in your quotes

• The peak power in kWp and, for a battery, the usable capacity in kWh: both set the aid.
• How the system is set up for self-consumption, and what happens to surplus electricity.
• Whether the installer offers pre-financing, and a deposit of no more than 30 % if you want it.
• Separate lines for panels, inverter, battery, mounting and electrical work.

What a solar system costs before aid is in our guide to solar panel costs in Luxembourg.