EVwire brief: Tesla has opened its first factory built specifically for the Semi electric truck and says high-volume production of the Class 8 vehicle is now underway..
The rollout event was led by Tesla VP of Vehicle Engineering Lars Moravy and Semi Program Lead Dan Priestley, who walked attendees through the Semi's development and the changes made to prepare it for volume production. Elon Musk did not attend in person, but sent a recorded message congratulating the team and outlining the truck's performance, charging and economic goals.
Here’s Elon’s opening remarks:
Tesla says the new factory is designed for 50,000 Semis per year, with Standard Range, Long Range and European-spec versions built on the same production line. The company also says the production truck has been extensively redesigned over the past four years, using lessons from a pilot fleet that has accumulated 17.5 million miles hauling freight in real-world settings.
Here are 10 key takeaways from the event.
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1. The Semi Factory and its targets
The dedicated 1.8-million-square-foot Tesla Semi factory sits adjacent to Gigafactory Nevada and is designed to produce 1,000 Semis per week. Tesla says Standard Range, Long Range and European-spec Semis will all be built on the same production line, with an annual capacity target of 50,000 trucks.
The company said the high-volume production ramp began in April, with output expected to increase gradually.
2. The many firsts of the Semi Factory
Tesla says the factory is the first to powder-coat a complete Class 8 tractor. It also uses what the company described as the highest-weight-capacity EMS conveyance system in vehicle manufacturing, capable of moving 39 fully assembled frames-in-white.
“This is the first time we've done a powder-coated surface, so you can get a Semi in any color you want, as long as it's white. For now.”
The facility also has one of Tesla's most automated battery lines. Unlike a conventional truck plant that primarily assembles components supplied by other companies, Tesla is producing stampings, batteries, drive axles, high-voltage distribution units, cooling modules and seats in-house. Tesla maintains that bringing more of the manufacturing process under its own roof is necessary to reduce cost.
3. Why Tesla switched to 4680 battery cells
Tesla says engineers spent the past four years redesigning the Semi for volume production. One of the biggest changes is the move from purchased 2170 cells to Tesla's in-house 4680 cells. The company says the change allows for a lower-mass battery with fewer kWh while maintaining the same range. Improvements in the efficiency of the rest of the vehicle also contributed to that reduction.
Priestley summarized the broader redesign during the presentation:
“It is more efficient. It is more reliable, more manufacturable, and ultimately set up to deliver the lowest total cost of ownership.”
Tesla said the earlier pilot fleet, consisting of just under 200 vehicles, has accumulated 17.5 million miles while hauling freight in snow, rain, desert conditions and mountain routes. The pilot Semi fleet has also proven that the production truck has since demonstrated more than 500 miles of range on a single charge fully loaded to 82,000 lbs, with a half-loaded truck at 60,000 lbs able to go around 600 miles.
4. Tesla’s updates to the Semi drivetrain
The production Semi replaces the earlier carbon-fiber rotor with a steel-caged rotor that Tesla says is cheaper, more reliable and more efficient. The truck also uses a bar-wound stator shared with Cybertruck, a design Tesla already builds at volume. According to Tesla, the combination improves operational range across different weather, terrain and payload conditions.
Tesla also spent a lot of effort into optimizing the design of the Semi’s drivetrain so the vehicle’s maintenance becomes simpler. As per Priestley, the original Semi’s drive axle used three different types of oil. The Semi in its current iteration uses only one.
5. The Tesla Semi’s electric steering system
Tesla says the Semi is the first Class 8 truck with electric steering, eliminating the hydraulic compressors and fluids used by conventional steering systems. The company says the electric system is lighter, quieter, more precise and redundant by design. Tesla also said the architecture lays the groundwork for the Tesla Semi’s autonomous driving capabilities, which will be rolled out in the future.
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6. The Tesla Semi’s Megamanifold heat pump
Tesla introduced a heat pump system it calls the Megamanifold, which handles cabin HVAC and every powertrain heating and cooling loop at once. The company said Semi can recapture waste heat from the motors and battery to warm the cab, something diesel trucks typically can't do because that engine heat is lost. The same thermal architecture is used on Cybercab.
Priestley noted that the Semi doesn’t even has AC lines.
“One thing you might notice about this thermal system is that there's no AC lines, there's no refrigerant lines. And that's the beauty of the indirect thermal system is it comes from the factory fully charged, sealed with refrigerant and it just exchanges coolant.
“It doesn't actually run refrigerant up to the front of the vehicle. So there's no AC lines to worry about damaging or leaking or having to do any work in the shop. It's a great tight integrated system straight out of the factory..”
7. Tesla’s numerous Semi cabin improvements
Tesla said the cabin uses acoustic glass and extra insulation for a quieter interior. It also swapped the earlier truck's pop-out window for a full roll-down window after customers said the pop-out design didn't work for interfacing with badge readers, toll booths, and call boxes along real routes. The cabin is tall enough for a driver to stand in, with visibility Tesla says beats a conventional diesel cab.
More importantly, drivers also get individual profiles tied to their phone, so the truck adjusts seat position, mirrors, and UI settings automatically when they get in, and a trip planner gives dynamic range estimates that account for weather, traffic, and changing loads as trucks pick up or drop off freight. Tesla has also automated portions of the required pre-trip inspection and can generate electronic logs showing when those checks were completed.
8. The best maintenance is no maintenance
Tesla says the Semi requires far less scheduled maintenance than a comparable diesel tractor. The company reported more than 98% year-to-date uptime in 2026 and emphasized that vehicle availability is ultimately more important than simply reducing the number of maintenance items.
Priestley put the philosophy simply:
“We really emphasize, again, best part is no part, best maintenance is no maintenance. But ultimately, the uptime is what really matters. And electric does provide that.”
If the Semi needs maintenance, however, Tesla has set up a system that allows for minimum downtime and maximum convenience for customers. Mobile service allows technicians to perform repairs to the Tesla Semi onsite, and over the air diagnostics allows customers and Tesla to be fully informed about what needs to be repaired without having to go to a physical shop. Tesla is also leveraging its commuter vehicles’ parts distribution system to make sure that replacement parts are easy to order and acquire.
9. The Tesla Semi’s Megacharger ramp
Tesla demonstrated a live Semi charging session during the event at approximately 1.2 MW. The company says a Megacharger can restore up to 60% of the truck's range in 30 minutes.
Tesla also said it expects more than 30 Megacharger stations to come online by the end of the year, representing more than 200 MW-capable posts. Customers can also install charging at their own depots, with Tesla offering a roughly 125 kW Basecharger designed for overnight charging.
The event also demonstrated that the truck can sustain high charging power. Moravy and Priestley noted that the Semi was still pulling around 1.2 MW during the presentation, with the truck at 27% state of charge.
10. The Economic Case
Tesla framed Semi's operating-cost argument around cheaper electricity versus diesel, fewer service visits, and high availability. As per Priestley, operating a truck with predictable operating costs is advantageous to a business, and that’s really where the Semi’s edge lies.
“When it all comes down to it, this is about cost. We've mentioned it about reliability, about trying to drive volume, about trying to do everything we can to improve the cost and lower it for our customers, and it's still the goal. For those that are looking to get get into the business, whether you're a new fleet and you're building or you're looking to turn your fleet over, I mean, wouldn't it be nice to cut out all that volatility, the diesel price, but also the maintenance?”
Customer deliveries of the Semi have started, with Tesla saying it will also use the truck to haul its own freight. Moravy and Priestley closed the event by teasing a Roadster appearance "next week," without further detail.
Kyle Conner of Out of Spec posted a quick review of the Tesla Semi on X:
Context:
Even before the event, drone footage of the Semi Factory revealed a fleet of customer Semis waiting to be handed over. The customer lineup outside the factory also gives a glimpse of how broad Tesla's Semi customer base has become. The vehicles featured logos from PepsiCo, US Foods, Einride, LTS, Nevoya, OK Produce, ABF Freight, DHL, WattEV, IMC Logistics and HMD.
Just two days before the event, ZET SCALE announced a 2,500-truck electric Class 8 program with Tesla selected as its primary OEM, with deployments planned across 10 major freight hubs. Forum Mobility has separately announced four new California heavy-duty charging depots adding 30 MW of capacity, including three sites where Tesla will operate public Megachargers, while more than 330 Tesla Semis have contracted fleet offtake at Forum's FM Santa Fe depot in Rancho Dominguez.
Source: Tesla Semi on X
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