Renault and Geely have introduced a breakthrough in electric mobility: a compact combustion engine system designed to extend the driving range of electric vehicles (EVs). Developed by HORSE, the brands’ joint powertrain division, the new unit is so small it can fit inside a suitcase.
The announcement was made just before the Munich Motor Show (September 9–14), where the innovative technology drew attention for its potential to transform EVs into extended-range electric vehicles (EREVs) with minimal modifications.
The HORSE C15: A Suitcase-Sized Range Extender
The HORSE C15 integrates a motor, generator, and inverter into a single compact module. Its flexibility allows installation in the front or rear, horizontally or vertically, without requiring major structural changes.
✨ Key highlights of the HORSE C15:
- Uses a 1.5L four-cylinder engine (naturally aspirated or turbocharged).
- Power output ranges from 70 kW (95 hp) to 120 kW (163 hp).
- Works exclusively as a generator — not mechanically connected to the wheels.
- Ensures optimal efficiency by running in the ideal rpm range.
- Enables smaller, lighter, and cheaper batteries without compromising range.
- Supports plug-in charging as a complement to its generator function.
- Designed to meet Euro 7, China 7, and SULEV20 standards.
- Compatible with low-carbon synthetic fuels.
🟢 Driving Experience: The C15 keeps the smooth, silent, and instant-response feel of EVs while solving the biggest concern — range anxiety.
Specs at a Glance
| Feature | Entry-Level Version | Turbocharged Version |
|---|---|---|
| Engine | 1.5L 4-cylinder | 1.5L 4-cylinder |
| Output | 70 kW (95 hp) | 120 kW (163 hp) |
| Target Vehicles | Compact cars | SUVs, vans, larger vehicles |
| Operation | Generator only | Generator only |
| Charging | Plug-in + generator | Plug-in + generator |
| Fuel Compatibility | Synthetic fuels | Synthetic fuels |
Brazilian Development: Kardian-Based Solution
While Europe prepares for the HORSE C15, Brazil is already testing its own localized solution. At Electric Days Brasil 2025 (Rio de Janeiro, June 24–26), Renault-Geely presented a working prototype based on the Renault Master EV.
Instead of the 1.5L C15, the Brazilian team used the HR10 1.0L turbo flex engine (also used in the Renault Kardian). Installed in the cargo area for demonstration, the unit will ultimately fit in the trunk for passenger models.
🔋 Key features of the Brazilian prototype:
- Operates between 2,500–3,500 rpm.
- Paired with a WEG generator, inverter, and energy management module.
- Retains plug-in charging functionality.
- Scalable to larger engines like the HR13 1.3 turbo (used in Duster and future Bigster).
- Capable of powering cars, boats, buses, and vans.
- Reduces battery modules for lower weight, cost, and faster recharging.
💡 According to HORSE CEO Matias Giannini, extended-range solutions are one of the fastest-growing EV categories globally. Brazil’s locally adapted system is expected to be crucial for electrifying fleets, especially in converting diesel-powered vehicles.
Why This Matters
This innovation could mark a turning point in EV adoption, particularly in markets where:
- Charging infrastructure is still developing.
- Large fleets rely heavily on diesel vehicles.
- Consumers remain hesitant due to range limitations.
By enabling smaller batteries, reducing reliance on rare raw materials, and supporting synthetic fuels, Renault and Geely are making electrification more accessible and sustainable.
🌍 The HORSE C15 and its Brazilian counterpart show how regional adaptations can accelerate the global transition to clean mobility — from compact city cars to heavy-duty buses.
✅ News takeaway: Renault and Geely’s HORSE division is redefining EV range extenders with a compact, flexible, suitcase-sized engine. While Europe gets the C15 1.5L system, Brazil is pioneering its own solution with the HR10 1.0L flex engine, targeting the local reality of mixed fuels and heavy vehicle fleets.
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