Installing photovoltaic panels on company roofs

Photovoltaics: an environmentally and financially interesting alternative for your company’s electricity production

A photovoltaic installation enables you to produce renewable electricity and to decouple part of your electricity costs from market price fluctuations. Beyond self-consumption, there are other support mechanisms that can represent an interesting economic model, such as the guaranteed feed-in tariff or the market premium resulting from a call for tenders. The installation can be financed from your own funds or by a third-party investor, who can also take care of its planning and completion.

Definition of the requirements

Analysis of plant location and solar potential – solar cadastre

• Self-assessment of solar potential

Identify solution and check feasibility of photovoltaic panel installation project

General planning of the installation (depending on the scope of the project, in collaboration with a qualified craftsman or design office)

• Qualified craftsmen (certified electrician)
• List of large-scale photovoltaic project planners

Feasibility study of the solar panel installation project

• Technical and constructive feasibility (static calculations, roof condition, etc.): design office
• Connection feasibility: network operator
• Fire protection requirements: CGDIS

Request for quotation

• Qualified craftsmen (certified electrician)
• Possibility of including plant maintenance in the offer

Subsidy application

Government subsidies

Please note: any application for government or non-government subsidies must comply with the “incentive effect”, subject to compliance with the subsidy conditions.
In order to respect the “incentive effect”, no binding commitment (signing a quotation; paying a deposit) may be made BEFORE having received the agreement in principle from the State or the electricity and natural gas supplier following an application for subsidy.

Klimabonus

The Klimabonus state subsidy scheme is available to both legal entities and individuals. However, pre-financing is not available to legal entities whose activities are subject to a business permit. These entities must follow the standard procedure and apply to the Environment Agency (AEV) after the work has been completed.

The subsidy rate for a photovoltaic installation is calculated based on the power of the system, using the following formula:

P_PV * (1.155 – (1.155 / 35) * P_PV) €

P_PV: peak electrical power of the photovoltaic solar installation concerned, expressed in kilowatt-peak (kW_p) and rounded to two decimal places.

This scheme does not impose any limit on the peak power of the installation. However, a ceiling of €10,000 per installation applies for systems with a capacity of 15 kW_p or more. The minimum eligible capacity is 2 kW_p.

A photovoltaic installation can be combined with a storage battery, which is also eligible for a subsidy. For further details, please refer to the measure “Installation of a battery storage system in your company”. Here you cand find more information on the application procedure for financial assistance.

• If you have any questions, please contact Klima-Agence.

Call for tenders for operating subsidies for large-scale photovoltaic power plants

The operating subsidy allows, in principle, companies to enter into a market premium contract over a 15-year period, during which they will be remunerated based on the electricity produced and fed into the grid.

There are currently no open calls for tenders under the operating aid scheme.

An indicative multi-annual timetable now makes it possible to anticipate future opportunities.

Call for tenders to support investment in photovoltaic installation projects >30kWp and ≤200 kWp

As part of competitive tenders for photovoltaic installation projects, the State supports the establishment of photovoltaic power plants through investment aid. This subsidy is granted to encourage companies to produce their own energy.

This new call for tenders launched by the Ministry of Economy is open from 16 February to 17 April 2026 and comprises three lots (see table below). For each lot, sub-lots dedicated to photovoltaic installations with storage devices are included. The maximum budget for this call for tenders is €3 million.

• Here is the link to the specifications in French
• If you have any questions, please contact Klima-Agence

An indicative multi-year calendar now makes it possible to anticipate future opportunities.

N.B. Government subsidies and calls for projects cannot be combined for the same project.

Tax relief for investment in an ecological and energy transition project

The tax relief is calculated based on the investments and operating expenses incurred as part of an ecological and energy transition project.
The tax relief rate is set at 18% and is applied directly to the amount of tax due.
This deduction can be combined with standard state subsidies.

For the project to be eligible, it must meet at least one of the following objectives:

• Improve the energy efficiency of a production process
• Improve the material efficiency of a production process
• Decarbonise a production process
• Reduce air pollution at the production site (excluding CO2 emissions)
• Produce or store renewable energy for self-consumption
• Promote the extended use of products through reuse

For certain objectives, minimum thresholds must be met.
To verify your eligibility and ensure that these thresholds are satisfied, it is recommended that the impact of the measure on one of the above conditions be certified by an expert or a design office.

Further details and conditions: Guichet.lu
For questions: Ministry of Economy – Bonus

Applying for permits

• Municipal permits depending on the municipality where the project is located.
• Permit and conditions for the installation of the grid operator.
• “Nature protection” permit if the facility is located in a protected area.

After the installation of photovoltaic panels

• In the case of self-consumption: submitting the application for self-consumption to the grid operator
  • For the surplus electricity to be injected: sign an electricity buy-back contract at the market price with a supplier
  • If participating in a call for tenders with investment aid: submit the request for payment of the aid via the tool on MyGuichet.lu.

• Apply for remuneration for the electricity produced by the photovoltaic system, depending on the specific situation:
  • Guaranteed feed-in tariff under the Klimabonus subsidy scheme (< 30 kWp) with the grid operator
  • Feed-in tariff without investment aid for installations >30kWp to < 400 kWp with cooperative with the grid operator.
  • Market premium with or without a call for tenders for photovoltaic installations from 400 kWp to 10 MWp with the grid operator and conclusion of a contract for the direct sale of the electricity with an agent who is normally a supplier.

• Scheduled maintenance of the installation