Wireless EV charging while driving uses transmitter coils installed in or beneath a specially equipped road and a receiver coil mounted under a compatible vehicle. Electricity sent through a road coil creates a changing magnetic field; the vehicle’s receiver captures energy from that field, and onboard electronics convert it into power for the battery or propulsion system. It works only on equipped road sections and with vehicles built or retrofitted with the matching receiver hardware—not on an ordinary road with an ordinary EV.
What happens between the road and the car?
The technology is called dynamic wireless power transfer, or dynamic wireless charging. “Wireless” describes the transfer across the small gap between the roadway transmitter and the vehicle receiver: no cable connects the moving car to the road. The energy still comes from the electrical grid, and the roadway needs substantial installed equipment to deliver it.
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The underlying principle is inductive power transfer. A current that changes direction in a transmitter coil produces a changing magnetic field. When a receiver coil is close enough to that field, the changing field induces electrical power in the receiver. The receiver’s electronics condition that power for the vehicle’s electrical system. The same broad principle is used in some small wireless chargers, but a road system operates at automotive power levels, over a road-to-vehicle gap, and with hardware designed for moving vehicles. The analogy does not mean that a phone charger or stationary wireless pad can charge an EV in motion.
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- Grid supply: Electricity reaches power equipment beside or near the equipped roadway.
- Power conversion: A rectifier converts grid-frequency alternating current (AC) to direct current (DC). An inverter then converts that DC into high-frequency AC for the road’s transmitter coils. Compensation components help the system transfer power across the gap.
- Road transmitter: Current in an energized transmitter coil creates a changing magnetic field. The coils are embedded in or installed beneath the pavement.
- Vehicle receiver: A coil mounted underneath a compatible vehicle couples to the magnetic field. Receiver-side compensation and rectification electronics condition the captured energy and provide DC.
- Vehicle use: The resulting power can supply the vehicle’s propulsion system and/or battery system, depending on the system design.
The car does not receive power simply because it is driving over a coil. A road segment has to be connected to its power electronics, the vehicle needs a compatible receiver, and the system must control when a road section is energized. On Indiana’s testbed, receiver-equipped test vehicles can trigger the system; during testing, non-test traffic is excluded from the segment.
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What hardware must be installed?
Dynamic charging requires equipment on both sides of the transfer. On the road, that means transmitter coils, power electronics, connections to the electrical supply, and controls. In the vehicle, it means a receiver coil and onboard electronics able to process the received power and connect it to the vehicle’s electrical system. A vehicle without this receiver cannot pick up energy from the road coils.
Indiana’s testbed illustrates the roadway components. The installation has 85 transmitter coils beneath the pavement, with roadside power electronics housed in vaults. The coils sit about 2.4 inches below the pavement, according to the project description. The test vehicles use retrofitted receivers; the system is not a feature that can be assumed to exist in a standard production EV.
The coils are arranged along a defined test segment rather than spread continuously across an ordinary road network. That distinction matters: a car can receive power only while it is over an energized part of a suitably equipped route. It does not continuously charge on roads without transmitters, and the system does not eliminate the need to store energy in the vehicle battery.
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What has been demonstrated on real roads?
Two project reports show that dynamic inductive charging has been tested at substantial power, but their figures describe particular installations, vehicles, and operating conditions. They are not universal specifications for every wireless road-charging system.
| Project | Test setup | Reported results | How to interpret the figures |
|---|---|---|---|
| Indiana, United States | An 85-coil testbed on a quarter-mile section of US 52/US 231 near West Lafayette; a retrofitted Class 8 truck was used for the high-power test. | 50–190 kW at speeds up to 65 mph; efficiency approaching 85%. | These are results reported for the specific test configuration in Purdue University’s 2026 Joint Transportation Research Program final report. “Up to” and “approaching” are important qualifications, not promises of constant output or a guaranteed efficiency on other roads. |
| A10 near Paris, France | A 1.5 km motorway pilot with pickup-coil-equipped truck, van, car, and bus prototypes tested in real traffic. | More than 300 kW instantaneous power and more than 200 kW average power under optimal steady-state conditions. | These are initial results reported by VINCI, a project partner, in 2025. The average figure is explicitly tied to optimal steady-state conditions; it should not be read as typical output for any vehicle or trip. |
The Indiana project began in 2018 and built a quarter-mile testbed. The roadway was completed and reopened to traffic after construction, while tests used equipped vehicles. Its 2026 final report documents power delivery to a retrofitted Class 8 truck at speeds up to 65 mph. This establishes that a particular engineered system can transfer power to a moving vehicle at highway speed; it does not establish that public roads are generally equipped or that consumer EVs can use them.
VINCI’s 2025 announcement describes the A10 motorway trial as a pilot. Its four vehicle types and reported power figures demonstrate the scope of that project, but the numbers come from the project partner and are not a standardized comparison with the Indiana test. The projects differ in installation, vehicles, test conditions, and the way their performance figures are stated.
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How should power and efficiency figures be read?
Power, energy, and efficiency answer different questions. Kilowatts (kW) measure the rate of energy transfer at a moment or over a stated interval. Kilowatt-hours (kWh) measure an amount of energy accumulated over time. A high power figure does not by itself say how much charge a car gains during an entire journey; that depends on how long it is above energized coils and the actual power delivered over that interval.
“Instantaneous” or peak power is not interchangeable with sustained or average power. VINCI’s report distinguishes more than 300 kW instantaneous from more than 200 kW average under optimal steady-state conditions. Those qualifiers must travel with the numbers. Likewise, Indiana’s 50–190 kW range and “up to 65 mph” describe reported test results, not a guaranteed power level at every speed or on every pass.
Efficiency describes how much input energy becomes useful transferred energy under a specified measurement boundary. The Indiana report says efficiency approached 85% for its configuration. That result should not be generalized to every deployment, and it is not the same as saying that a vehicle’s full grid-to-wheel process is 85% efficient. The test report also describes strong tolerance to misalignment, but its result is system-specific; it does not mean placement is irrelevant or every vehicle can receive power regardless of its receiver position.
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Does the car charge its battery or power its motor?
Received power can serve the propulsion system and battery system. That means the system may contribute to driving the vehicle while it passes over powered roadway, and energy may also be directed into the battery. The proportion and control strategy depend on the particular vehicle and charging system; the cited demonstrations do not establish a single universal operating mode.
Even with dynamic charging, a vehicle still needs a battery or other onboard energy storage. It must travel between equipped sections and continue to operate where no transmitter coils are installed. Dynamic charging is therefore better understood as an additional source of energy along selected routes than as a replacement for the vehicle’s energy storage or all other charging options.
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What determines whether a road network makes sense?
A working demonstration is only one part of the deployment question. A road network has to put powered segments where vehicles can use them, provide enough power for the traffic and vehicle mix, and connect the roadway equipment to the electrical grid. The National Laboratory of the Rockies’ EVI-InMotion planning tool models variables such as route coverage, charging-segment length and location, receiver-equipped vehicle numbers, battery capacity, grid loads, and costs.
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- Route coverage: Which routes and portions of each route would be equipped? The usefulness of a segment depends on where vehicles encounter it and how often they travel there.
- Segment length and layout: How long are powered sections, and how are coils positioned? Short or infrequently encountered segments may contribute less energy over a trip than a carefully located route network.
- Vehicles and receivers: How many vehicles can use the system, what receiver hardware do they carry, and do the onboard electronics match the roadway installation? Different vehicle classes and receiver arrangements affect planning.
- Power and battery needs: What power can the road deliver under real operating conditions, and how does that compare with vehicle energy use and battery capacity?
- Grid connection and timing: Where must the grid supply be strengthened, and when and where will charging demand occur? Load location and timing are part of the planning problem.
- Combined costs: Roadway equipment and vehicle components both matter. A route-level analysis needs to account for infrastructure and vehicle costs rather than evaluating the transmitter coils alone.
The planning tool can help agencies or fleet planners explore feasibility and trade-offs; a model is not proof that a particular route is economically favorable. The cited project sources do not establish broadly applicable commercial installation costs, long-term maintenance costs, or lifecycle emissions results. Claims that dynamic charging will necessarily reduce battery sizes, costs, or emissions should therefore be treated as prospective rather than demonstrated outcomes.
What does this mean for an EV owner today?
The described projects use purpose-built road segments and test or prototype vehicles with specially installed receivers. The cited official project information does not show that an ordinary production EV can charge while moving on an ordinary road. Compatibility depends on the vehicle having the required receiver and power electronics, as well as the road being equipped with a compatible transmitter system.
That makes dynamic road charging fundamentally different from stationary wireless charging pads. A stationary pad transfers power while a compatible vehicle is parked over it. A dynamic installation transfers power over a road segment while the vehicle moves. Neither can substitute for the other without the corresponding road or vehicle equipment.
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What to check when evaluating a proposed system
For an agency, fleet, or technology assessment, compare like with like rather than selecting the largest headline number. Record the specific vehicle, speed, route segment, test duration, and conditions alongside every performance figure. Separate peak power from average power, and identify the conditions behind any efficiency claim.
- Ask whether the reported value is instantaneous, peak, or averaged over a stated period.
- Check the vehicle type and whether it was a prototype or a retrofit test vehicle.
- Identify the length and coil layout of the equipped segment and how much of the relevant route it covers.
- Ask how vehicle receiver position and alignment affect coupling; do not assume a tolerance demonstrated by one system applies to another.
- Include grid interconnection, roadway installation, vehicle receiver hardware, and operating costs in the same planning frame.
- Distinguish measured results from modeled future benefits, especially for costs, battery sizing, and emissions.
Dynamic wireless charging is a real engineering approach, not a way for any current EV to draw power from any road. Its core operation is inductive transfer between powered roadway coils and a compatible vehicle receiver. Highway-speed power transfer has been demonstrated in specific trials; broad availability, costs, and long-term environmental performance are separate questions that the cited demonstrations do not settle.
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