With series production due to get underway this year at the Nevada factory whose construction was completed last year, the recently updated Tesla Semi will definitely be making headlines in 2026.
So it should come as no surprise the manufacturer released a video on X in the final hours of 2025 showing its engineers demonstrating a V4 Supercharging session where the power output climbs to a peak of 1.2 MW (1,206 kW):
To be clear, Tesla's V4 Superchargers are not the same as Megawatt chargers.
[Related: Megawatt charging explained: What it is and why it matters]
The former are built to handle just about anything on the road. It can deliver megawatt-level charging for heavy-duty vehicles like the Tesla Semi, while still charging everyday electric cars much faster than older chargers. Basically, it's one system that connects standard fast charging with the true megawatt charging required for Class 8 rigs.
What the video does not state, kind of surprisingly, is how full the truck's battery was, so it's unclear how long it can actually hold this top charging speed. Hitting a high peak speed is still pretty impressive, but the key test is keeping that speed without any overheating.
At this rate, the charger can add a huge amount of energy very quickly. This would be enough that, in ideal conditions, the Semi could go from a low to a mostly full battery in way less than an hour.
The Semi's fresh design updates, a necessary thing given that it was first unveiled way back in 2017, include improved aerodynamics, an efficiency boost to 1.7 kWh per mile, and a higher payload capacity. To date, Tesla has reportedly built around 70 Semis, mostly for early customers (and industry giants) like PepsiCo and DHL.
[Related: DHL declares: 'Tesla Semi is ready for prime time']
The company stopped taking new Semi reservations in August 2022 and has not yet announced when reservations will reopen nor updated pricing.
