On June 5th, test pilot Miguel Iturmendi piloted the Helios Horizon from Zephyrhills, Florida, making history as the first crewed, fixed-wing aircraft powered by solid-state batteries. This breakthrough hints at a promising future for sustainable aviation with improved energy density and safety.
- Helios Horizon is the first crewed electric plane using solid-state batteries
- Solid-state technology improves safety and increases energy density by 60%
- Future flights aim to reach commercial cruising altitudes and longer durations
What happened
On June 5th, Miguel Iturmendi successfully completed the first crewed flight of an aircraft powered by solid-state batteries. The Helios Horizon, a modified motorized glider, took off from Zephyrhills Municipal Airport in Florida for a series of brief test flights. These were designed primarily to validate the aircraft’s weight distribution and balance after replacing its previous lithium-ion battery pack.
The solid-state batteries installed deliver 410 watt-hours per kilogram, significantly outperforming the older technology’s 260 Wh/kg. This marked a historic achievement as the first time a fixed-wing, manned aircraft flew using this safer, more efficient battery type. Though the flights were short, their success opens a new chapter for electric aviation.
Why it feels good
Electric aviation has long been limited by the low energy storage capacity of traditional lithium-ion batteries, which rely on liquid electrolytes and pose fire risks. Solid-state batteries replace liquids with solid materials, making them more impact-resistant and safer to operate. By boosting energy density by 60%, these cells promise longer flights and lighter aircraft designs.
Additionally, the Helios Horizon uses renewable sources like solar panels on its wings and regenerative systems that recover energy during descents. This holistic approach to energy efficiency not only aligns with global sustainability goals but also enhances the practicality of electric flight without depending on complex charging infrastructure.
What to enjoy or watch next
The development team aims to push the Helios Horizon to reach commercial cruising altitudes of 40,000 feet later this year, a key milestone in proving the viability of solid-state battery-powered planes for real-world travel. Meanwhile, other companies, including China's EHang and battery giants like CATL, are also exploring solid-state technologies to revolutionize eVTOLs and commercial aircraft.
With energy density improvements projected to increase by another 40% soon, we can expect rapid advancements in electric aviation. This history-making flight might be just the beginning of a cleaner, quieter, and more sustainable era in air travel.