about joule
Joule inspires change and aspires innovation
Joule is an owner-managed, medium-sized company based in Luxembourg. Our services include:
-
Consulting
-
Fast Online Simulation of your PV system
-
Home Assessment
-
3D Roof Measuring with drones
-
3D Simulation for PV systems
-
Amortization calculation
-
Authorization requests preparation
-
Installation and Initial Operation
-
Maintenance and Repair
-
Cleaning of PV systems
-
E-mobility
-
Integration of E-Mobility with PV
We are committed to driving the energy transition by delivering sustainable energy solutions, embracing innovation, and creating a path toward a more energy-efficient future for everyone.
Tired of rising energy costs and looking for long-term independence? Joule has the perfect solution for you!
Whether you are a tenant, an apartment owner or homeowner, our services are tailored to meet your unique needs and living situation.
Tenant
As a tenant, you can still be part of the energy transition. Our compact balcony solar systems let you generate clean energy, covering a substantial part of your household electricity needs.
Owner
As a property owner, your house, apartment, or unused land can be optimized for solar self-consumption. Additionally, you can sell surplus energy back to your energy supplier, turning your property into a source of sustainable power.
Co-owner
As a co-owner, you can collaborate with others to embrace sustainable energy solutions. By working together, you and your neighbors can create a shared commitment to renewable energy and a greener future.
With our expertise and innovative solutions, we guide you on the path to a more energy-efficient and sustainable future. Contact us today to get started!
about our services & products
what can joule do for you?
Balcony solar systems
Fits on balconies, flat roofs, carports or lown areas.
Each solar module produces 400W, while the lightweight version produces 200W. A maximum of 2 standard solar panels or 4 lightweight modules can be installed, offering a total output of 800W (which corresponds to the power usage of several common household appliances.)
joule provides the complete PV system:
-
Solar Panels
-
Inverter
(What converts the solar energy into energy you can use)
-
Wi-Fi Antenna
(In order to connect with the mobile app)
-
Production Control App
(So you can monitor the performance of your solar panel)
-
Optional Wi-Fi-Repeater
(If it is too far from your router)
-
10 year product warranty
Our service includes on-site installation for immediate use.
Good to know
Your benefits:
-
Increased energy independence
-
Electricity bill reduction
-
Active contribution to the energy transition and climate protection
-
Fast amortisation in 3 to 5 years
-
Up to 50% investment subsidy
(Klima-Bonus), plus possible subsidy from your municipality)
-
Systems of 800W
do not require authorization or registration with your grid operator
Compared to a Classic solar plant:
-
Any overproduction
can be fed into the grid, but without financial compensation.
-
Maximum of 800 watts
per residential unit
What are my next steps?
Standard solar panel system (Mostly self-consumption)
Fits on roofs, lawn areas or any flat area.
The most common installation for this type of system is on a roof, whether it’s your home or an outbuilding like a barn. As a single-family homeowner, you can set up the system for your own use. If you co-own a property, you can collaborate with other owners to plan a collective self-consumption installation.
joule provides the complete PV system:
-
Solar Panels
-
Inverter
(What converts the solar energy into energy you can use)
-
Battery Storage System
-
Wi-Fi Antenna or optional 4G antenna with SIM card
(if Wi-Fi is unavailable)
-
Production Control App
(So you can monitor the performance of your solar panel)
-
Optional Wi-Fi-Repeater
(If it is too far from your router)
-
10 year product warranty
Our service includes on-site installation for immediate use.
Good to know
Your benefits:
-
Increased energy independence
-
Electricity bill reduction
-
Option to feed excess energy into the grid for compensation
-
Fast Amortisation in less than 5 years
-
Active contribution to the energy transition and climate protection
-
Increased property value
-
Up to 50% investment subsidy
(Klima-Bonus), ) (max. 1562,50€ per kWp for systems under 30kWp), plus possible subsidy from your municipality
Compared to a Value solar plant:
-
Lower feed-in tariff for overproduction
you need a purchase agreement with an electricity supplier and are subject to their tariff policies
What does it cost me?
The photovoltaic market is complex and constantly evolving, with numerous models and formats available. To help you navigate this landscape, joule offers a free simulation with our calculation tool that provides a detailed assessment of your roof’s potential.
This tool estimates energy output, cost savings, and environmental impact in terms of CO2 reduction and an estimation of the installation cost. After using the simulation tool, you can book a site visit for a binding offer that includes all technical details for the recommended system.
What are my next steps?
Utility-scale solar system (100% feed in)
Fits on roofs, lawn areas or any flat area.
This type of installation is particularly advantageous for unused buildings or plots of land. It allows the owner(s) to generate income, increase the property’s value, and contribute to the energy transition all at the same time.
joule provides the complete PV system, including on-site installation and initial operation.
joule provides the complete PV system:
-
Solar Panels
-
Inverter
(What converts the solar energy into energy you can use)
-
Battery Storage System
-
Wi-Fi Antenna or optional 4G antenna with SIM card
(if Wi-Fi is unavailable)
-
Production Control App
(So you can monitor the performance of your solar panel)
-
Optional Wi-Fi-Repeater
Optional Wi-Fi-Repeater
-
10 year product warranty
Our service includes on-site installation & initial operation.
Good to know
Good points:
-
Feed-in of your solar energy production
into the grid with a guaranteed feed-in tariff for 15 years (Grand-Ducal regulation of 12 April 2019). Alternatively, you can negotiate a purchase agreement with an electricity supplier that offers a flexible feed-in tariff and contract duration.
-
Amortisation of the system in less than 5 years
-
Active contribution to the energy transition and climate protection
-
Increased property value
-
20% and max. 500€ per kWp investment subsidy
(Klima-Bonus) ) for installations under 30kWp, plus possible subsidy from your municipality
Compared to a Value solar plant:
-
You cannot consume the energy you produce.
-
The investment subsidy is smaller
(20% compared to 50%)
What does it cost me?
The photovoltaic market is complex and constantly evolving, with numerous models and formats available. To help you navigate this landscape, joule offers a free simulation with our calculation tool that provides a detailed assessment of your roof’s potential.
This tool estimates energy output, cost savings, and environmental impact in terms of CO2 reduction and an estimation of the installation cost. After using the simulation tool, you can book a site visit for a binding offer that includes all technical details for the recommended system.
What are my next steps?
Agri-PV
Agri-PV - Maximizing Land Potential with Solar Energy
Sustainable energy meets agriculture – our Agri-Photovoltaic (Agri-PV) solutions allow landowners to generate clean electricity while maintaining agricultural activities, ensuring both economic and environmental benefits.
What is Agri-PV?
Agri-PV integrates solar power generation with farming, enabling a dual use of land. Unlike conventional solar farms, these installations are designed to coexist with crops or livestock, preserving the land’s primary function while increasing its value.
Key Benefits of Agri-PV
-
Optimized Land Use
Generate renewable energy without sacrificing agricultural productivity
-
Sustainable & Profitable
Additional income through self-consumption or energy feed-in
-
Climate-Resilient Farming
Provides shade for crops and livestock, reducing heat stress and water evaporation
-
Biodiversity Enhancement
Solar installations can create microhabitats that support pollinators and soil health
-
Long-Term Energy Security
Reduce reliance on traditional energy sources and mitigate rising electricity costs
Our Agri-PV Services
We provide a turnkey solution to simplify the transition to Agri-PV, including:
-
Feasibility Studies & Business Planning
Evaluating land suitability, energy output and financial viability
-
Regulatory & Environmental Planning
Assistance with permitting, biodiversity assessments, and legal requirements
-
Custom Solar System Installation
Designed for optimal integration with farming operations
-
Ongoing Maintenance & Monitoring
Ensuring system performance and long-term efficiency
Discover how Agri-PV can enhance your land’s potential while contributing to a more sustainable future. Learn more about our solutions and explore the possibilities with our team.
EV charging station
You can charge your electric vehicle either at a permanently installed wall charging station or occasionally using a standard socket. For reasons of convenience and safety, we advise you to install a wall charging station.
A wall charging station is a powerful charging solution that significantly reduces charging time. It allows you to charge your electric car safely and efficiently at home, as conventional household sockets are not designed to handle the continuous load of charging an electric vehicle.
Since every home has different requirements, we will assess on a site visit how your wall charging station can be installed for optimal performance.
Wall charging station AMTRON® 4You 100 installation includes:
-
11 kW charging power
(the average power, it can add 50-70km per hour of charging depending on the vehicle)
-
Easy cable management
-
LED status indicator
-
Replaceable covers in the colors of choice
-
Made in Germany
-
Investment subsidy Klima-Bonus: 750€
-
2year product warranty
Our service includes on-site installation & initial operation.
What are my next steps?
Smart EV charging station
If you arelooking to purchase a wall charging station for your electric vehicle and already have, or are planning to install, a photovoltaic system? With our intelligent wall charging station, you can utilize your self-generated electricity to either power your vehicle or feed it back into the grid.
The smart wall charging station detects when there is a surplus of electricity from your solar modules and uses this excess energy to charge your vehicle.
Since every home has different requirements, we will assess on a site visit how your wall charging station can be installed for optimal performance.
Smart wall charging station AMTRON® 4You 300 installation includes:
-
11 kW charging power
(the average power, it can add 50-70km per hour of charging depending on the vehicle)
-
Easy cable management
-
LED status indicator
-
Replaceable covers in the colors of choice
-
Made in Germany
-
Investment subsidy Klima-Bonus: 1.200€
-
2year product warranty
Smart wall charging station AMTRON® 4You 500:
-
Optional RFID access control to prevent unauthorized use
-
Optional App for managing functions such as starting, stopping, and monitoring the charge
Our service includes on-site installation & initial operation.
What are my next steps?
joule prepares all the necessary documents so that you can request authorisation from the grid operator.
Solar panels Simulator
Get an estimation of your roof's potential.
Quickly check and discover the benefits of joule's photovoltaic solutions with the help of our simulation and calculation tool.
e-cars Charging station configurator
questions
Frequently asked questions
Is Joule a Luxembourgish company?
Does Joule only operate in Luxembourg?
What does kWp mean?
Who is my grid operator?
In Luxembourg it rains a lot. Does a PV-installation make any sense?
How about maintenance?
What happens if my installation has a problem? Can I be without electricity?
My name is Marc Wagener, and I am an electrical engineer. I founded joule to help all types of households contribute to a sustainable future. My goal is to provide both home owners and tenants with the opportunity to invest in solar energy.
With over 20 years of experience as Manager and Managing Director in different industries (energy), as well as in the construction, renovation and management of properties in Luxembourg and abroad, I have gained extensive knowledge in energy efficiency and building sustainability. I am eager to share this expertise with you, both now and in the future.
I look forward to building a sustainable future together with the joule team and our customers.
Joule is an owner-managed, medium-sized service company based in Luxembourg, specializing in renewable energy solutions that empower electricity consumers to actively participate in the energy transition.
Whether you are a tenant, apartment owner, co-owner, or the owner of a house or other property, we offer tailored solar solutions for every living situation.
With our expert advice and end-to-end support, you can make a significant impact on the environment, reduce your energy costs, and embrace a sustainable lifestyle. At Joule, we are dedicated to make clean energy accessible for everyone.
Our brands
Contact us
Drop us a quick note in the form, and we’ll get back to you right away!
