United Kingdom, May 8 -- Rolls-Royce Power Systems is developing a hybrid drive system for haul trucks and will begin field testing it from autumn 2026 at a mining location. The system combines proven mtu Series 4000 engines with a high-performance electric drivetrain. Depending on the topography and operational profile of the mine, this can result in savings of up to 30 per cent in fuel consumption and CO2 emissions compared to conventional drive systems. Rolls-Royce will present the development concept at the Electric Mine Conference on 7 May 2026 in Lisbon, Portugal.The hybrid system stores the haul truck's braking energy in batteries during downhill journeys. This energy is then used to drive the wheel motors during the subsequent uphil...