We have been driving hybrid vehicles for decades, why not have a diesel-electric parallel hybrid semi truck? I take this hybrid big rig for a test drive. Is it as powerful and smooth as I would expect? Let’s dig in!
Why am I driving an European-spec IVECO semi truck? It’s because I am in Germany at a 2026 ZF Technology Day. This IVECO cabover truck is equipped with a 11-liter FPT Cursor 11 turbo-diesel engine and a ZF 12-speed automated-manual transmission. This engine is rated between 420-480 horsepower and between 1,500-1,700 lb-ft of torque depending on its version. This is a standard setup that you can find in a lot of trucks on the road today.
The new part is the addition of an electric motor, battery, and supporting electrical components. This is a parallel-style hybrid. It means that the diesel engine and/or the electric motor can send power to the wheels via the transmission. The electric motor is sandwiched between the turbo-diesel engine and the transmission. You see this configuration in the current Ford F-150 PowerBoost hybrid and the Toyota Tundra iForce-MAX hybrid pickup trucks.
The electric motor adds up to about 300 horsepower to the system. This means the semi truck can drive on electric power alone without starting the diesel engine. This can benefit you greatly while driving in dense traffic or moving around a yard or depot. It provides quiet and efficient driving.
When you need extra power or the battery is getting low on charge, the turbo-diesel engine joins in for maximum power and long range driving. Consider that you can have around 700 horsepower combined from this hybrid. You can accelerate quickly and climb a long mountain grade with more ease.
When the time comes to slow down, you have the benefit of the electric motor regeneration, the diesel exhaust/engine brake, and the transmission gearing. ZF says the system can regenerate energy at a rate of around 200 kW, which could amount to a significant amount when descending long mountain highways.
The prototype truck I am driving has a small 30 kWh battery for demonstration purposes. ZF envisions a system like this could have a 100 kWh battery or a 220 kWh battery with its own charging plug. They say when equipped with a large battery and a plug-in system this hybrid can save up to 47% on diesel fuel and DEF costs.
After a quick first drive, I noticed this hybrid working smoothly and predictably when accelerating and when slowing down. It’s a pleasure when you can get going from a stop in near silence and with smooth and uninterrupted acceleration.
Adding an electric system to the big rig can also allow for engine downsizing. If you needed a 15-liter or 13-liter turbo-diesel before, you may make do with an 11-liter or a 9-liter engine. This can allow for further fuel savings.
Naturally, a hybrid system will add cost. It includes an electric motor, a battery, inverter, and more. This technology is not for every use case, but the added initial cost can be recouped quickly if you drive a lot in congested cities or over large hills and mountains.
Please join me in the video below for the first drive and let me know what you think.
