Tesla has shown off a new electric power-take-off feature, or ePTO, for the Semi, turning the truck’s battery pack into a mobile power source for external equipment. The system can deliver up to 25 kW, enough to run tools, trailer systems, and even refrigerated semitrailers without a separate diesel generator.
The move is smart for a very unglamorous reason: cold-chain logistics still burns fuel at the edges. By feeding trailer hardware directly from the truck’s battery, Tesla can cut noise, emissions, and maintenance while making electric freight a little more useful in the jobs that actually pay the bills.
ePTO gives the Tesla Semi a second job
Tesla says the feature, called ePTO, is designed for external loads including power tools and trailer-mounted systems. In practice, that means the Semi is no longer just pulling freight; it can also keep the freight alive, which matters a lot for food and pharmaceuticals that need temperature control from depot to delivery.
That puts Tesla in the same broad category as other EV makers trying to turn heavy trucks into jobsite power hubs, but with a cleaner pitch: one vehicle, one battery, fewer moving parts. The company is also borrowing a familiar idea from Cybertruck’s PowerShare system and scaling it up for commercial use, where 25 kW is less party trick and more operational feature.
Tesla Semi battery configurations
Tesla has previously said the Semi comes in two certified configurations. Here is the short version:
- Long Range: 822 kWh of usable battery capacity
- Standard Range: 548 kWh battery
- New ePTO output: up to 25 kW for external equipment
For Tesla, the feature is also a sales argument. Fleet operators do not buy trucks because they admire battery chemistry; they buy them because the numbers work. If ePTO helps eliminate diesel refrigeration units, the Semi gets closer to being a full system upgrade instead of just a cleaner tractor.
What fleet operators will test first
The obvious test case is refrigerated freight, where a truck can now potentially haul and power the trailer in one go. The next question is whether the feature will hold up under daily abuse, because commercial buyers love efficiency right up until a feature adds complexity in the field.
If Tesla can make ePTO reliable, expect competitors to follow with similar trailer-power claims. If not, the Semi will still have a strong battery story, but this extra function will stay what so many EV features become: a great demo, and a tougher fleet rollout.