All-electric cars still walk a narrow path between promise and practicality. While the technology has matured rapidly, customer hesitation—most notably range anxiety—remains a stubborn obstacle. Renault appears to have acknowledged this reality, and its response comes in the form of extended-range electric vehicle (EREV) technology, developed through Horse, the joint venture between Renault and Geely.
The confirmation follows recent sightings of a camouflaged electric Renault Megane undergoing testing with what appeared to be an additional power unit on board. That unit, it turns out, is not a step backwards but a strategic pivot: a compact internal combustion engine designed not to drive the wheels, but to generate electricity when the battery runs low.
A Retrofit Solution to a Lingering Problem
Horse’s EREV kit is particularly intriguing because it is designed to be adaptable. Rather than requiring a ground-up redesign, the system can be retrofitted to existing electric platforms, effectively transforming a pure EV into a range-extended hybrid. In doing so, it directly targets one of the most significant barriers to widespread EV adoption: the fear of running out of charge far from a plug.
This development arrives at a crucial moment. With Europe easing its stance on the 2035 ban and allowing internal combustion engines to survive in alternative forms, Renault—like many other manufacturers—has recalibrated its long-term strategy. EREV technology offers a way to continue investing in electrification without betting everything on battery-only solutions.
Compact, Light, and Technically Ambitious
At the heart of Horse’s solution is a newly developed three-cylinder engine with a displacement of 999 cc. Despite its small size, the unit is impressively versatile. Featuring direct injection and a turbocharger, it can run on standard unleaded petrol as well as E100 ethanol. Continuous output is rated at 95 hp, with peak power reaching 115 hp, while torque remains a healthy 200 Nm in both configurations.
Crucially, this engine is not intended to dominate the driving experience. Instead, it plays a supporting role, acting primarily as a generator to supply electricity to the battery and electric motor. Horse describes it as a “high power density unit,” and it complies fully with stringent Euro 6d emissions standards.
Packaging is where the engineering effort truly shines. Weighing just 135 kilograms and measuring approximately 700 mm in length and 600 mm in width and height, the engine is compact enough to fit into the front of the electric Megane. How Renault’s engineers have managed this remains an open question, potentially involving a rear-mounted electric motor and a complete rethink of front-end architecture.
Efficiency by a Different Measure
Traditional fuel consumption figures are difficult to apply here, as the engine does not directly propel the car. Instead, Horse quotes consumption in terms of energy generation: 0.49 liters per kilowatt when running on E100 ethanol. While ethanol has a lower calorific value than petrol—meaning higher volumes are required to produce the same energy—real-world estimates still appear promising.
Translated into more familiar terms, consumption is estimated at around 4.4 liters per 100 km for the 95 hp configuration, rising to approximately 5.5 liters per 100 km at 115 hp. For a vehicle capable of operating primarily as an electric car, those numbers are remarkably restrained.
Nearly 700 Kilometers of Freedom
The payoff is range. With the EREV system installed, the electric Renault Megane could achieve close to 700 kilometers of total driving range—enough to all but eliminate the need for meticulous charging planning on long journeys. It’s a compelling middle ground between full electrification and conventional hybrids.
That said, patience will be required. Horse plans extensive validation and durability testing, with a targeted market launch in the first quarter of 2027. If all goes according to plan, the technology could appear either late in the current Megane E-Tech’s lifecycle or debut with the next generation of Renault’s compact hatchback.
In a market increasingly divided between ideology and usability, Renault’s EREV strategy feels refreshingly pragmatic. Rather than forcing customers to adapt to technology, Horse’s solution adapts technology to customers—and that may prove to be its greatest strength.
Source: Renault