Tesla Semi Battery Specs Revealed: 822kWh Powers 500-Mile Range

California Regulators Reveal Tesla Semi's Full Battery Specifications

The California Air Resources Board (CARB) has publicly disclosed the battery capacity and key technical specifications of the Tesla Semi, the company's all-electric Class 8 semi-truck. According to a regulatory filing first reported by automotive outlet Teslarati, the long-range variant of the Tesla Semi packs a massive 822kWh battery, delivering an estimated range of over 500 miles on a single charge — a figure that could reshape the economics of long-haul electric trucking.

The disclosure comes through CARB's standard certification process, in which automakers submit powertrain details to obtain 'zero-emission' credentials. Once the executive order is issued, the filing becomes a public document, giving industry watchers and competitors an unprecedented look at Tesla's electric trucking ambitions.

Key Takeaways at a Glance

• Long-range Tesla Semi carries an 822kWh NCMA lithium-ion battery with ~500-mile range
• Standard-range variant features a 548kWh pack delivering ~325 miles of range
• Peak power output reaches 800kW (long-range) and 525kW (standard-range)
• Energy efficiency sits at approximately 1.7 kWh per mile for both models
• Pricing starts at $260,000 for standard-range and $290,000 for long-range
• Gross vehicle weight (GVW) is 82,000 lbs (approximately 37,195 kg) for both configurations

Breaking Down the Battery: 822kWh Is a Landmark Figure

The 822kWh battery in the long-range Tesla Semi is one of the largest battery packs ever deployed in a production commercial vehicle. To put that in perspective, the Tesla Model S Long Range carries roughly a 100kWh battery, meaning the Semi's pack is more than 8 times larger. Even compared to other electric truck efforts — such as the Nikola Tre BEV with its approximately 753kWh battery — Tesla's figure represents a significant step forward in energy density and packaging.

Both variants use NCMA (Nickel-Cobalt-Manganese-Aluminum) lithium-ion chemistry, a cathode formulation that Tesla has been refining to balance energy density, longevity, and cost. NCMA chemistry reduces cobalt content compared to older NCA or NMC formulations, which helps lower material costs and mitigate supply chain risks tied to cobalt mining.

The standard-range model, equipped with a 548kWh battery, still offers a substantial 325-mile estimated range. For many regional and short-haul routes, that capacity could be more than sufficient — and at $260,000, it represents a $30,000 savings over its long-range sibling.

Efficiency That Defies Expectations

Perhaps the most striking detail in the CARB filing is the energy efficiency figure of approximately 1.7 kWh per mile — consistent across both the standard and long-range models. This suggests Tesla has engineered the Semi's aerodynamics, drivetrain, and rolling resistance to a remarkably uniform standard regardless of battery size.

For context, a conventional diesel semi-truck typically consumes about 6 to 8 miles per gallon of diesel. At current U.S. diesel prices averaging around $3.70 per gallon, that translates to roughly $0.46 to $0.62 per mile in fuel costs alone. The Tesla Semi, at 1.7 kWh per mile and assuming commercial electricity rates of $0.10 to $0.15 per kWh, would cost approximately $0.17 to $0.26 per mile in energy — a potential savings of 50% to 65% on fuel costs.

• Diesel truck fuel cost: ~$0.46–$0.62 per mile
• Tesla Semi energy cost: ~$0.17–$0.26 per mile
• Potential savings: 50%–65% per mile on energy alone
• Annual savings estimate: $30,000–$50,000+ for a truck running 100,000 miles per year

Those savings compound dramatically across large fleets. Companies like PepsiCo, which has been operating a pilot fleet of Tesla Semis since late 2022, have already reported promising real-world performance data. If the efficiency figures hold up under diverse operating conditions — varying terrain, weather, and payload — the total cost of ownership argument for the Semi becomes extremely compelling.

Pricing and Market Positioning

At $290,000 for the long-range model and $260,000 for the standard-range, the Tesla Semi commands a significant premium over conventional diesel Class 8 trucks, which typically cost between $130,000 and $180,000. However, the sticker price tells only part of the story.

Electric trucks benefit from dramatically lower maintenance costs — no oil changes, fewer brake replacements thanks to regenerative braking, and far fewer moving parts in the drivetrain. Combined with the energy cost savings outlined above, fleet operators could potentially recoup the price premium within 3 to 5 years, depending on utilization rates and local electricity pricing.

Federal and state incentives further narrow the gap. The Inflation Reduction Act (IRA) offers tax credits for commercial clean vehicles, and California's own HVIP (Hybrid and Zero-Emission Truck and Bus Voucher Incentive Project) can provide vouchers worth tens of thousands of dollars per vehicle. These programs can shave $40,000 to $100,000 or more off the effective purchase price.

How Tesla Semi Stacks Up Against Competitors

The electric heavy-truck market is heating up, and Tesla is far from the only player. Here is how the Semi compares to key rivals:

• Nikola Tre BEV: ~753kWh battery, ~330-mile range, priced around $300,000+
• Freightliner eCascadia: ~438kWh battery, ~230-mile range, focused on regional haul
• Volvo VNR Electric: ~565kWh battery, ~275-mile range, already in fleet deployments
• BYD Class 8 Truck: Various configurations, strong presence in port drayage applications
• Peterbilt 579EV: ~396kWh battery, ~150-mile range, targeting short-haul and regional routes

Tesla's 500-mile range claim for the long-range Semi, if validated in real-world conditions, would give it a decisive advantage for long-haul applications — a segment where competitors have largely conceded ground due to battery weight and range limitations. The 82,000-lb GVW rating also confirms the Semi meets federal weight limits under the current exemption for alternative-fuel vehicles, which allows an additional 2,000 lbs over the standard 80,000-lb cap.

Production Challenges and the Road Ahead

Despite the impressive specifications, Tesla's Semi program has faced persistent questions about production scalability. The truck was originally unveiled in 2017, with initial deliveries to PepsiCo not beginning until December 2022. Volume production has remained limited, with Tesla focusing on building out its dedicated Semi manufacturing facility in Sparks, Nevada.

CEO Elon Musk has indicated that the company aims to ramp Semi production significantly in 2025 and beyond, though exact volume targets remain unclear. The sheer scale of battery supply required — an 822kWh pack per truck means each Semi consumes the equivalent of roughly 8 passenger EVs' worth of cells — places enormous demands on Tesla's battery supply chain, including its 4680 cell production and partnerships with suppliers like Panasonic and CATL.

The CARB filing, however, signals forward momentum. Regulatory certification is a necessary step toward broader commercial availability, and the fact that both standard-range and long-range variants are now documented suggests Tesla is preparing for a more diversified product offering.

What This Means for the Trucking Industry

The implications of a viable 500-mile electric semi-truck extend far beyond Tesla. The U.S. trucking industry moves approximately 72% of the nation's freight by weight, generating over $900 billion in annual revenue. It is also one of the largest sources of transportation-related carbon emissions.

If Tesla can deliver the Semi at scale with the specifications outlined in the CARB filing, it would validate a key thesis: that battery-electric technology can compete with diesel not just in short urban routes, but in the medium- and long-haul segments that form the backbone of American commerce. That, in turn, would accelerate investment from legacy truck manufacturers, charging infrastructure providers, and fleet operators.

Charging infrastructure remains a critical bottleneck. A truck with an 822kWh battery requires megawatt-level charging to achieve reasonable turnaround times. Tesla's Megacharger network, designed specifically for the Semi, is still in early deployment. The buildout of this network — alongside competing standards like the Megawatt Charging System (MCS) being developed by CharIN — will be just as important as the truck itself.

Looking Ahead: 2025 Could Be a Pivotal Year

With CARB certification now publicly documented, the Tesla Semi moves closer to broader commercial deployment. Several factors will determine whether 2025 becomes the breakout year for electric heavy trucking:

First, production volume at Tesla's Nevada facility will need to scale meaningfully. Second, the Megacharger network must expand beyond pilot installations to create viable long-distance corridors. Third, real-world fleet data from early adopters like PepsiCo will need to continue validating the efficiency and reliability claims.

The CARB filing is not just a regulatory footnote — it is a data-rich confirmation that the Tesla Semi's technical foundation is formidable. Whether Tesla can translate those specifications into tens of thousands of trucks on the road remains the central question. But for an industry watching closely, the numbers are now on the table — and they are hard to ignore.