As the world rapidly moves towards sustainable and green technologies, Detroit, the heart of America's automotive industry, is pioneering an innovative project: electric charging roads.
The project is a collaboration between the state of Michigan, the city of Detroit, Ford, DTE Energy and Electreon. It took two years and $1.9 billion to complete the quarter-mile section of road before opening to testing in November of 2023.[1]
These roads promise to reshape the future of electric vehicle (EV) transportation by providing on-the-go charging solutions, potentially eliminating range anxiety and promoting the widespread adoption of EVs.
In this article, we’re sharing how they work, the likelihood of adoption elsewhere and what it means for the future of electric vehicles.
How do electric charging roads work?
Electric charging roads employ a technology known as dynamic wireless power transfer (DWPT). This system uses a series of embedded copper coils beneath the road surface that generate an electromagnetic field.
When an electric vehicle equipped with a receiver passes over these coils, the receiver converts the electromagnetic field into electrical energy, which charges the vehicle's battery in real-time.
The process involves:
- Power source: Electricity is supplied to the road coils which are connected to the city power grid.
- Transmission: The embedded coils create an alternating electromagnetic field.
- Reception: A receiver coil in the EV captures the electromagnetic energy and converts it to direct current (DC) to power the battery through inductive charging.
- Control system: Advanced software and sensors manage the energy transfer, ensuring efficiency and safety.
Pros and cons of electric charging roads
There are a number of advantages to this new technology, but also some drawbacks. Some of the cons are speculative as this technology is so new, it may take some time to figure out how exactly this innovation can be rolled out.
Pros:
- Extended range: By providing continuous charging, these roads significantly extend the range of electric vehicles, reducing the need for frequent stops at stationary charging stations.
- Convenience: Drivers no longer need to plan their routes based on charging station locations, offering greater flexibility and convenience.
- Reduced battery size: With constant charging, vehicles can operate with smaller batteries, potentially lowering the cost and weight of EVs.
- Environmental impact: The integration of renewable energy sources into the grid powering the roads can further reduce carbon footprints.
- Innovation and economy: As Detroit leads this technological advancement, it can spur economic growth, attract investments and create jobs in the region.
Cons:
- High initial costs: The installation and maintenance of electric charging roads require substantial investment. The technology is currently estimated to cost around $2 million per mile to build.[2]
- Infrastructure challenges: Retrofitting existing roads or building new ones with this technology is a complex process, involving coordination with various stakeholders and possible disruptions to traffic during construction.
- Vehicle compatibility: Not all EVs are currently equipped to use the technology. Upgrading existing vehicles or ensuring new vehicles are compatible may take time.
- Energy efficiency: There are concerns about the energy efficiency of wireless power transfer over long distances and the potential for energy loss, which could affect the system's overall sustainability.
- Maintenance and reliability: The technology must be robust and reliable under various weather conditions and wear from traffic. Ensuring consistent performance requires rigorous maintenance protocols.
What’s next?
Detroit's electric charging road project is currently in a testing phase, with plans for gradual expansion based on the outcomes.
Testing will go on another year before individual drivers can acquire receivers to wirelessly power their EVs. If the pilot project is successful, the expansion plan includes making another road also in Detroit. From there, scaling will depend on collaborating with automotive manufacturers, technology firms, and energy companies to share the costs and benefits of the infrastructure.
The company that made the road in Detroit, Electreon, also completed a wireless charging station for buses in Tel Aviv which charges the bus without plugging in while passengers are loading and unloading. There are other places in Europe, Asia and the Americans where electric-charging road projects are underway or being scouted for potential expansion.
There is a hope that wireless charging roads could be a solution for long-haul trucking which disproportionately contributes to carbon emissions. It’s not currently feasible for most of these trucks to be electric because the weight they care is too great and they aren’t able to stop frequently to charge. If buses or trucks could charge without stopping, it could be a huge benefit for sustainability.
These roads could also encourage more people to purchase electric cars, if they didn't have to worry about stopping at stationary charging stations.
FAQs about electric charging roads
Here are some common questions about this new technology.
Wrapping up
Electric charging roads represent a groundbreaking leap in the quest for sustainable transportation. Detroit's initiative could serve as a model for cities worldwide, demonstrating the potential to integrate advanced technology into everyday infrastructure.
While there are challenges to overcome, the long-term benefits of reduced emissions, enhanced convenience and economic growth make this an exciting development in the journey towards a greener future.