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Open-pit mining operations rely heavily on large haul trucks that consume substantial fuel during transport. With fuel costs and emissions-reduction targets placing greater pressure on mine operators, Rolls-Royce Power Systems is preparing to test a hybrid drive system to improve efficiency in heavy mining fleets.

Field trials are scheduled to begin in autumn 2026 using a haul truck fitted with an mtu Series 4000 engine combined with an electric drivetrain.

Hybrid System Designed Around Mine Haul Cycles

The system has been developed to leverage the repetitive operating patterns in surface mining. During downhill travel, braking energy is captured and stored in batteries onboard the truck. That stored energy is later used to power electric wheel motors during uphill climbs, reducing the diesel engine’s load.

Rolls-Royce estimates this could reduce fuel consumption and carbon dioxide emissions by up to 30% compared with conventional drive systems, depending on mine layout and operating conditions.

The company is developing the technology as a modular platform that can be adapted for different truck classes, haul profiles, and site conditions.

Haul Truck Fuel Use Remains a Major Operating Cost

Transport activities account for a significant share of operating expenses in open-pit mines, largely because of the scale and fuel consumption of haul truck fleets. Large mining trucks can burn considerable volumes of diesel fuel per hour while moving ore and waste material along long-haul routes.

Mining companies are increasingly examining lower-emission technologies as demand for minerals tied to electrification, renewable energy infrastructure, and data centre expansion grows. Many producers have also introduced long-term emissions reduction targets extending into the coming decades.

Retrofit Capability Part of Long-Term Plan

Rolls-Royce Power Systems already supplies mtu engines for equipment used throughout surface mining operations, including drilling rigs, excavators, wheel loaders, and dump trucks.

The mtu Series 4000 engines selected for the hybrid project are intended for continuous heavy-duty use. Certain versions are also compatible with hydrogenated vegetable oil fuel.

The hybrid drivetrain is being developed with retrofit capability in mind, allowing existing haul trucks to be upgraded rather than replaced entirely.

Prototype Testing Set for This Year

The first prototype vehicle is expected to begin operating in field conditions later in 2026. Rolls-Royce also plans to present the full hybrid haul truck concept at the Electric Mine conference series in Lisbon in 2027.

The mining sector is expected to closely monitor the trial program as operators continue to evaluate technologies that could reduce diesel consumption across large surface mining fleets.

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