The Electric Retrofit That Cuts Semi Truck Diesel Consumption by Up to 65%. No New Tractor Required.

Semi trucking is one of the harder problems in decarbonization. The tractors are expensive, the routes are demanding, and the charging infrastructure for long-haul electric trucks is still being built out. Range Energy has a different entry point: instead of replacing the tractor, electrify the trailer. Out of Spec Reviews sat down with Range Energy CEO Ali Javidan at ACT Expo to walk through the hardware, the business model, and a recently announced partnership with Sysco. The system installs on any existing trailer in four hours using standard tools, works with diesel or electric tractors, and requires no new tractor purchase.

The numbers make the case. The electric powertrain delivers a 40% reduction in diesel consumption on the tractor before accounting for the refrigeration unit. That alone is a meaningful figure, but refrigerated trailers are where the system compounds: a typical reefer unit burns one to two gallons of diesel per hour at idle, running 10 to 14 hours per day. Range Energy powers the refrigeration electrically, capturing energy through regenerative braking during the route and using it to run the reefer without burning diesel. Combined savings on a daily refrigerated route reach up to 65% of total fuel consumption. At $4.50 per gallon for diesel, the company estimates a payback period of roughly two years. The system then runs for over a decade, saving between $25,000 and $40,000 per trailer annually at $3.50 per gallon before any diesel price movement.

What makes Range Energy's engineering approach distinctive is what they chose not to touch. There is no connection to the tractor's CAN bus and no data passed between the trailer system and the truck. Instead, the system reads IMU sensors and native trailer signals to infer driver intent in real time, filling in torque between gear shifts on semi-automated gearboxes. The ZF AxleTrac 2 e-axle, originally designed for electric buses, has been adapted for trailer use with modified track widths and suspension pickup points. A 300 kWh battery pack (200 kWh for non-refrigerated configurations) charges at up to 150 kW DC and can be transferred from one trailer to another in the same day if the primary unit is taken out of service. The system also provides two-way power, running the lift gate, cameras, and accessories from the same platform. With 3.5 million class-8 trailers on North American roads and around 80% running out of volume before weight capacity, Range Energy's retrofit doesn't require a replacement cycle to reach scale.

Bottom line: The payback math at current diesel prices is compelling even before incentives, and Sysco's involvement signals that a serious fleet operator has run the numbers and found them credible. If Range Energy delivers on the first customer deployments at year end, this is the kind of quiet infrastructure play that moves significant diesel consumption off the books without waiting for electric tractor infrastructure to mature. Worth watching closely.