Horse Powertrain, a joint venture between Geely and Renault, has introduced an innovative new range extender that could reshape the future of extended-range electric vehicles (EREVs). Unveiled at the 2026 Beijing Auto Show, the new HORSE D20 Methanol combines a compact, high-efficiency generator with a methanol-powered engine, offering an alternative to conventional gasoline-powered range extenders.
Range-extended EVs are designed to solve two of the biggest concerns surrounding battery-electric vehicles—range anxiety and charging availability. Unlike traditional hybrids, the combustion engine in an EREV does not drive the wheels directly. Instead, it generates electricity to recharge the battery when needed.
The HORSE D20 takes that concept a step further by replacing gasoline with 100% methanol fuel while introducing an advanced axial flux electric generator that delivers greater efficiency in a significantly smaller package.
Compact Design With High Power Density
The HORSE D20 integrates a 2.0-liter turbocharged four-cylinder engine, an electric generator, and power electronics into a single package weighing just 170 kg (374 pounds). Despite its compact dimensions, the system delivers up to 105 kW of electrical output, making it suitable for a wide range of future electric vehicles.
A key innovation is its axial flux motor, which is mounted directly to the engine’s crankshaft. Unlike traditional radial flux motors that use a cylindrical rotor inside the stator, the axial flux design stacks the rotor and stator into thin discs. HORSE uses a yokeless architecture with two rotors surrounding a single stator, allowing the generator to be considerably more compact.
According to the company, the axial flux motor is 46% shorter than a comparable radial flux unit while producing 63–64% more power per unit of volume. The motor also achieves an impressive 96.4% electrical efficiency, helped by an integrated silicon carbide (SiC) power module that minimizes energy losses.
Methanol-Powered Range Extender
Instead of gasoline, the D20’s turbocharged engine is engineered to operate on 100% methanol fuel. Methanol offers lower carbon monoxide emissions than conventional gasoline and is increasingly being explored as an alternative fuel for future low-emission transportation.
The engine incorporates several advanced technologies, including a 240 mJ high-energy ignition system that enables ultra-lean combustion. This improves overall efficiency while reducing fuel consumption.
Cold-weather performance has also been addressed. The engine can perform pure methanol cold starts at temperatures as low as -35°C (-31°F), helping ensure reliable operation in harsh winter climates.
The powertrain complies with China’s CN6b emissions standard and also meets the requirements of the upcoming Euro 7 emissions regulations.
Strong Efficiency Figures
Horse Powertrain says laboratory testing demonstrated a 47% fuel-to-energy conversion efficiency, meaning approximately 1 kWh of electricity is generated from every 2.1 kWh of methanol consumed.
In practical terms, the company estimates that only 19.6 liters (5.1 gallons) of methanol are required to fully recharge a 40 kWh battery pack, highlighting the system’s potential to significantly extend vehicle driving range without lengthy charging stops.
A Different Approach to Extended-Range EVs
While battery-electric vehicles continue to improve in range and charging speed, range extenders remain attractive for drivers who regularly travel long distances or have limited access to fast charging infrastructure.
Most existing EREV systems rely on gasoline engines. The HORSE D20 introduces a different approach by combining methanol fuel with a highly efficient axial flux generator, reducing package size while improving energy conversion efficiency.
The new powertrain also serves as an early demonstration of axial flux motor technology in a potential mass-market automotive application. If adopted by vehicle manufacturers, it could pave the way for more compact and efficient extended-range electric vehicles in the years ahead.
As automakers continue exploring multiple pathways toward lower emissions, technologies like the HORSE D20 highlight how alternative fuels and next-generation electric drive systems may complement battery-electric vehicles rather than replace them.
