New analysis from FEV has revealed that range-extender electric trucks (REEV) can achieve a total cost of ownership (TCO) reduction of up to 33 percent compared to conventional diesel vehicles. The findings, derived from an extensive internal research program evaluating techno-economic data across multiple driving cycles, underscore the immediate economic viability of hybrid battery-electric architectures in the commercial vehicle sector.
Depending on the application profile, the analysis shows that REEV trucks not only deliver significant cost savings but also reduce CO₂ emissions dramatically. Even in the most demanding long-haul scenarios, TCO advantages of approximately 14 percent are achievable — without reliance on a fully developed public high-performance charging network.
What Range Extender Technology Means
Range extender technology refers to a hybrid-electric vehicle architecture in which a battery-electric drivetrain is supplemented by a small auxiliary power unit — typically a combustion engine or fuel cell — that recharges the battery during operation. Unlike conventional hybrid systems, the range extender does not directly drive the wheels. Instead, it acts as an onboard generator, maintaining battery charge levels and extending the vehicle’s operational range beyond the capacity of its battery alone.
This architecture enables commercial vehicles to operate almost entirely electrically in daily use, particularly when combined with overnight depot charging. The combustion engine engages only when needed — for instance, on longer routes where charging infrastructure is sparse. As a result, range extender trucks offer the emissions benefits of electric driving for the majority of operations while eliminating the range anxiety and infrastructure dependence that currently constrain pure battery-electric trucks (BEVs). Crucially, this allows for a significantly smaller, lighter, and more cost-effective battery than those required for long-haul BEVs.
Economic Efficiency Without Megawatt Charging
A central finding of the FEV study is the reduced dependency on costly and not yet widely available megawatt charging systems. While a pure battery-electric long-haul truck typically requires a battery capacity of around 560 kWh to ensure adequate range, a range-extender truck can operate effectively with a battery of approximately 280 kWh. This smaller battery reduces vehicle weight, increases payload capacity, and lowers acquisition costs.
The analysis assumes a realistic European operating scenario with overnight depot charging at industrial electricity rates of around 19 cents per kWh. With standard AC charging at 22 kW, approximately 240 kWh can be replenished overnight — sufficient to cover the vast majority of daily mileage electrically. This makes the REEV architecture immediately deployable within existing depot infrastructures, bypassing the need for expensive and time-intensive expansion of megawatt charging networks.
“Our analysis clearly shows that the range extender makes electric trucks immediately economically and ecologically viable — without waiting for the widespread expansion of high-performance charging infrastructure. This is precisely what is crucial in long-distance transport,” said Dr. Norbert W. Alt, Chief Operating Officer of the FEV Group.
TCO Advantages and Operational Flexibility
The economic superiority of the REEV architecture stems from a combination of lower capital expenditure, reduced operating costs, and enhanced operational practicality. Compared to diesel trucks, the total cost of ownership is lowered through:
- Reduced vehicle investment: Smaller battery size translates directly into lower manufacturing and purchase costs.
- Lower energy costs: A high share of electric driving, especially with low-cost overnight depot charging, significantly reduces fuel expenditures.
- Greater payload capacity: Reduced battery weight allows for higher cargo loads, increasing revenue potential per trip.
- Infrastructure independence: Fleet operators avoid the substantial capital outlay required for megawatt charging installations and are insulated from delays in public infrastructure rollout.
In short-distance and regional transport cycles, where electric driving shares are highest, the TCO advantage climbs to as much as 33 percent — a margin considered transformative in the cost-sensitive commercial vehicle market.
Significant CO₂ Reductions
Beyond the compelling economic case, the FEV analysis highlights substantial environmental benefits. Depending on the application profile and the energy mix used for charging, range-extender trucks can reduce global warming potential by up to 82 percent compared to conventional diesel trucks. This positions the technology as a key enabler of near-term decarbonization in the transport sector, bridging the gap between today’s diesel-dependent fleets and a fully electric future.
