On September 19 and 20, 2026, the Zolder circuitwill once again host the iLumen European Solar Challenge (iESC),Europe’s largest solar car race and the second most important in the world.
This endurance event brings togetheruniversity teams from across the globeto push the boundaries of solar technology.
The iLumen European Solar Challenge is designedto push the limits of competition and innovation in the field of solar vehicles.
It is the only 24-hour competition in the world dedicated to solar cars.
By participating in the iESC,teams can test and optimize their cars a year ahead of Australia’s World Solar Challenge—the world’s premier solar car race.
The Belgian race is open to everyone: university teams, official racing teams, and even independent squads—who are also true innovators in the sector.
The paddock atmosphere is completely different from that of conventional races; while teams work tirelessly on strategy, troubleshooting, and performance optimization, they do more than just compete—they exchange knowledge, support one another, and share best practices.
The “Greenville” area at the Zolder circuit offers an overview of the latest advancements in renewable energy, battery storage systems, smart charging, and more.
The iESC is free and open to visitors starting Friday afternoon.
The history of the iLumen European Solar Challenge
From a small local race to Europe’s biggest solar endurance challenge.
Since its inception, the iLumen European Solar Challenge has grown from a small event featuring just four solar carsinto the largest race of its kind in Europe. With each edition, the competition has grown in size, prestige, and technological impact, establishing itself as akey event on the global solar vehicle racing calendar.
The inaugural edition took place in 2010 at the Zutendaal military airbase, organized by the Rotary Club Genk-Staelen.Four teams fromBelgium, the Netherlands, Germany, and Franceparticipated in this first solar vehicle race.
The second edition in 2012moved to anurban setting, involving the city of Genkand the surrounding areas. With teams participating fromBelgium, the Netherlands, Germany, and Switzerland, international interest in the event continued to grow;consequently, in 2014, Green Technology Events was established as the official organizer and iLumen became the title sponsor, giving the event its current name.The race moved toCircuit Zolder, introducing a6-hour format featuring seven international teams.
For the fourth edition in 2016, the event evolved into the first 24-hour endurance race for solar vehicles.Twelve teams from across Europe and beyond—including Turkey and Colombia—competed at Circuit Zolder in this historic edition.
In 2018, a ten-year partnership was signed with Circuit Zolder, confirming the track as the permanent home of the iESC. The event welcomed22 teams from around the world, further cementing its global reputation.
Despite the COVID-19 pandemic, the 2020 race went ahead in compliance with strict health measures.Although23 teams had registered, travel restrictions reduced the starting grid to12 teams,who competed in a strictly controlled environment.Following the cancellation of the World Solar Challenge in Australia, the iESC organized a special edition in 2021to give teams the chance to compete. The event received strong support from the global solar racing community.
In 2022, the race returned with 22 teams from around the world; His Majesty King Philippe of Belgium attended the event, even boarding a solar vehicleand drawing national attention to the event’s role in sustainable innovation.
The latest edition, held on September 21 and 22, 2024, saw the participation of 23 teams, including many new entrants from across the globe. The event continues to grow, attracting more teams and setting new standards for solar vehicle endurance racing.
Two categories: Challenger and Cruiser
Looking at the starting grid of the iLumen European Solar Challenge,it is immediately apparent that not all solar cars are alike. Some resemblefuturistic race cars, whileothers look like the kind of cars we might one day see on our roads.
This is because teams compete intwo distinct categories: the Challenger Class and the Cruiser Class.
But what exactly is the difference?
Challenger Class: designed for performance
If you picture a typical solar-powered race car, it isyou are likely thinking of a Challenger.These cars aredesigned with a focus on efficiency and performance. Every detail counts: from reducing weight and aerodynamic drag to maximizing the distance covered using available solar energy.
The result is thedistinctive low-profile, aerodynamic shape you will see speeding around the Zolder circuit.
Challenger cars aretypically designed to carry a single person, leaving little room for superfluous elements. The goal is simple: to make the car as efficient as possible.
Cruiser Class: a look at everyday mobility
Cruiser cars approach the solar challenge from a different perspective.
Efficiency remains crucial, but so dopracticality and usability. These cars aredesigned to carry multiple passengers and tend to resemble conventional road cars more closely.
The concept behind the Cruiser class is therefore closelylinked to the future of sustainable mobility: how can solar technology be integrated into a car that people can actually use in their daily lives?
It is a different kind of engineering challenge, requiring teams to strike a balance between efficiency, performance, and practicality.
Two approaches, one challenge. So, which class is better?
In reality, neither is better than the other.
The two categories simply explore solar mobility from different perspectives. While Challenger class teams push the limits of pure efficiency and performance, Cruiser class teams investigate how to combine that technology with practical mobility.
Source: iESC
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