The only 24-hour solar race in the world

On September 19 and 20, 2026, Circuit Zolder will once again host the iLumen European Solar Challenge (iESC), the largest solar race in Europe and the second largest worldwide. This endurance event brings together university teams from across the globe to push the limits of solar technology.

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iESC 2026

Are you ready to take part in the world’s only 24-hour solar race?

Team registration
Compete against teams from around the world.
Volunteer registration
Contribute to the event and help shape the future of solar racing.

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19 & 20 September 2026

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Why participate
in the iESC?

The iLumen European Solar Challenge is designed to push the boundaries of solar racing and innovation.

Unique endurance race: the only 24-hour competition for solar cars worldwide.
Preparation for the World Solar Challenge: teams can test and optimize their vehicles one year ahead of the Australian race.
Open to all: university teams, factory teams, and independent innovators are all welcome.
A full racing experience: teams work around the clock on strategy, problem-solving, and performance optimization.
Strong international community: teams not only compete but also exchange knowledge, support each other, and share best practices.
More than a race: Greenville at Circuit Zolder offers insights into the latest advancements in renewable energy, battery storage, smart charging …

The iESC is free and open to visitors from Friday afternoon onwards. Schools, businesses, and technology enthusiasts are invited to explore cutting-edge solar and electric mobility innovations.