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How Honda’s Wireless Charging Road Could Power EVs—and What Still Needs Testing
Honda and its partners have developed a road embedded system that transfers power wirelessly to moving EVs, with reported capability of up to 150 kW. Honda R&D is responsible for the vehicle receiver and power transfer technology, Taisei for the DC power supply, and Taisei Rotec for methods to embed equipment in the...
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Key takeaways
- Honda and its partners have developed a road embedded system that transfers power wirelessly to moving EVs, with reported capability of up to 150 kW.
- Honda R&D is responsible for the vehicle receiver and power transfer technology, Taisei for the DC power supply, and Taisei Rotec for methods to embed equipment in the road.
- A separate Japanese public road trial reported about 10 kW of transfer and stable buried coil parameters after 18 months; those results are not a test of Honda’s system.
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Honda’s wireless charging project puts power-transmitting equipment in the road and a receiver on the vehicle. As an EV travels over the equipment, magnetic coupling transfers electricity without a plug. The partners are developing the system for passenger EVs and large commercial vehicles, including trucks; reported power capability is up to 150 kW. That is a development target, not evidence that the system is already operating as a highway charging service. 3
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How the road-based charging system works
The road contains transmitting equipment, while the vehicle carries a receiver. When the two are aligned as the vehicle passes over the equipment, magnetic coupling transfers power to the vehicle. Honda describes the technology as a wireless power-transfer road system; it is designed to support charging while driving rather than only when a vehicle is parked. 2
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The partners’ work is divided across the vehicle technology, power supply and road installation:
- Honda R&D develops the power receiver for EVs and the power-transfer equipment used in the system.
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- Taisei develops the power-supply system, including a high-response DC power supply.
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- Taisei Rotec develops methods for embedding the equipment in road pavement.
The system is intended for vehicles ranging from passenger cars to large commercial vehicles. Honda’s Japanese announcement describes work to accommodate the loads of heavy trucks, while other reporting gives an approximate vehicle weight of 20 tonnes. 11
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What testing has established—and what it has not
The companies have tested the system on an experimental road at Taisei Group’s T-FIELD/SATTE facility. Honda reports that the work verified the wireless power-transfer system, pavement structure, and construction and renewal methods. 3
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Those tests are a development milestone, not proof of long-term performance on a busy public highway. Honda’s Japanese announcement says further work is planned on durability using actual vehicles, power transfer while driving, and measures to address electromagnetic-field leakage. 11 The available Honda materials do not give a measured end-to-end charging-efficiency percentage, so the system’s overall efficiency cannot yet be judged from the published information cited here.
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Highway trials are planned from fiscal 2027
Honda, Taisei and Taisei Rotec plan to take part in NEXCO East’s Tateyama Project on the Tateyama Expressway in Chiba Prefecture. Demonstration testing is planned from Japan’s 2027 fiscal year, which begins April 1, 2027, to assess power-supply performance and durability in a highway setting. This is a planned trial, not a commercial launch date. 3
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Potential benefits and open questions
Charging while driving could reduce the need for some stationary charging stops, an especially relevant possibility for vehicles on regular freight routes. But the potential benefit depends on how much power vehicles receive on a route and how the system performs in real operating conditions. 1
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The available announcements do not establish a project-wide installation cost, operating cost or payback period. Whether any reduction in charging stops would offset the costs of road work, electricity supply, maintenance and compatible vehicle equipment remains an open question.
How Honda’s project compares with an earlier Japanese trial
Honda’s planned highway work is not Japan’s first experiment with charging EVs while they move. A separate public-road study reported transferring approximately 10 kW to an actual car, supplying 63.3% of the energy the car consumed while driving. It also reported that the buried transmission-coil parameters remained stable after 18 months of testing. 13
Those findings belong to a different project and should not be treated as results for Honda’s system. The Tateyama trials will provide a further opportunity to evaluate dynamic wireless charging on an expressway, but their planned scope does not show that Honda’s design has already outperformed earlier trials. 13
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What is the short answer to "How Honda’s Wireless Charging Road Could Power EVs—and What Still Needs Testing"?
Honda and its partners have developed a road embedded system that transfers power wirelessly to moving EVs, with reported capability of up to 150 kW.
What are the key points to validate first?
Honda and its partners have developed a road embedded system that transfers power wirelessly to moving EVs, with reported capability of up to 150 kW. Honda R&D is responsible for the vehicle receiver and power transfer technology, Taisei for the DC power supply, and Taisei Rotec for methods to embed equipment in the road.
What should I do next in practice?
A separate Japanese public road trial reported about 10 kW of transfer and stable buried coil parameters after 18 months; those results are not a test of Honda’s system.