Swiss trial proves wireless EV charging works at 90% efficiency

Imagine pulling into a parking spot and your car starts charging automatically. No cables. No fumbling with connectors. Just park, walk away, and your battery fills while you're inside.

That's no longer theoretical. Researchers in Switzerland just proved it works in the real world.

A team from Empa, the Swiss Federal Institute of Materials Science and Technology, working with the utility Eniwa AG, tested wireless inductive charging on actual vehicles over months. The results: 90% efficiency — matching traditional plug-in systems — with far less friction.

How the invisible handoff works

The system is elegantly simple. A transmitter coil embedded in the ground sends energy through a magnetic field to a receiver coil mounted under the car. When you park correctly over the plate, charging begins automatically. Before anything happens, the system scans for obstacles or people in the way — a safety check built into the handshake.

The real-world test site was the move mobility demonstrator in Dübendorf, where researchers pushed the technology through conditions that would break lesser ideas: snow, rain, cold, and deliberately misaligned parking. It held up.

"The technology works very reliably in practice," said Mathias Huber, who led the work at Empa's Chemical Energy Carriers and Vehicle Systems lab. "It's similarly efficient to conventional charging systems." The vehicles underwent rigorous electromagnetic compatibility and safety testing before they were allowed on Swiss roads — placing them among the first in the world to use inductive charging daily.

Why this matters beyond convenience

There's a deeper benefit hiding in this. When EVs charge automatically whenever they're parked — which for most cars is 20+ hours a day — they become mobile batteries for the grid. A car sitting in your garage overnight isn't just storing energy; it can feed power back when demand spikes or solar dips. No active intervention needed. The system handles it.

This is why grid operators care. Switzerland is pushing toward renewable energy, but renewables are intermittent. If millions of parked EVs could automatically absorb excess solar power during the day and release it at dinner time, the grid becomes far more stable. The wireless system makes this happen without asking drivers to think about it — they just park like always.

The INLADE project, supported by the Swiss Federal Office of Energy and the cantons of Zurich and Aargau, retrofitted existing vehicles with receiver coils and integrated them into the car's charging systems. It's proof-of-concept at scale, not a lab demo.

The next phase is obvious: scaling from a handful of test cars to actual infrastructure. Cities and parking operators are watching. If wireless charging networks spread, the friction between owning an EV and living with one dissolves. The car charges while you sleep. The grid balances itself. Energy moves from where it's generated to where it's needed, with no human choreography required.