US startup Revoy has raised $27 million to accelerate production of its detachable electric truck dolly, a system designed to add electric propulsion to existing diesel-powered heavy-duty trucks without replacing the vehicles.
The company plans to launch its first commercial operations later this year, targeting fleet operators seeking lower-emission transport solutions without investing in new battery-electric trucks.
Electric Dolly Extends Existing Diesel Fleets
Revoy’s detachable drive unit is installed between a truck tractor and trailer, providing electric assistance while allowing fleets to continue using their existing diesel tractors.
According to the company, the system can propel a fully loaded truck weighing up to 36.3 tonnes for more than 200 miles (322 kilometres) on a single charge while reducing carbon emissions by up to 85%.
The electric dolly supplements the diesel engine by delivering electric torque during acceleration. During braking, the system switches to regenerative mode, recovering energy to recharge the battery.
Revoy also plans to develop a network of battery swap stations where drivers can exchange depleted dollies for fully charged units, reducing downtime compared with conventional charging.
“Our technology allows you to compete with diesel at cost, which is not true yet for other electric trucks in the US,” said Revoy Chief Executive Officer Peter Reinhardt.
Funding to Support Commercial Expansion
Reinhardt said the company’s business model allows fleet operators to electrify existing vehicles without purchasing entirely new battery-electric trucks, addressing one of the key cost barriers to heavy-duty vehicle electrification in North America.
Under the model, Revoy retains ownership of the powered dollies while customers continue operating their existing diesel tractors.
The latest funding round was led by Standard Capital, with participation from XYZ Venture Capital, Doerr Capital, Time Ventures, Paul Graham, Y Combinator, Leap Ventures and other investors.
Including previous financing rounds, Revoy has now raised a total of $41 million.
The company plans to begin commercial operations later this year on a 200-mile freight route near Portland, Oregon, using four electric dollies assembled with components sourced from China.
The new capital will also support development of a second-generation electric dolly featuring a smaller, lower-cost battery while maintaining the same driving range.
