Tesla has recently unveiled the official battery specifications for the highly anticipated 2026 Tesla Semi in a new filing with the California Air Resources Board (CARB). This document provides a detailed look at the usable energy capacity and power output for both the Long Range and Standard Range versions of the electric hauler.
According to the CARB executive order, Tesla is utilizing a specialized lithium-ion chemistry known as NCMA (nickel-cobalt-manganese-aluminum) for the battery packs of the Tesla Semi. This particular blend is favored for heavy-duty applications due to its high energy density and reduced cobalt content, making it a cost-effective and efficient choice for electric trucks.
The flagship Long Range model boasts a massive 822 kWh usable capacity, supporting Tesla’s target of a 500-mile range while carrying a full load. With a steady power rating of 800 kW (approximately 1,072 horsepower), this electric truck can maintain high speeds and performance even on steep grades. On the other hand, the Standard Range model features a still substantial 548 kWh usable capacity, offering a range of approximately 300 miles on a single charge, making it ideal for shorter regional routes. It is rated at 525 kW of steady power, or around 704 horsepower, providing ample muscle for standard hauling duties.
The certification signed on April 15, 2026, is a significant milestone for Tesla as it prepares to ramp up production of the Semi. This certification confirms that the electric truck meets California’s zero-emission standards for heavy-duty vehicles, paving the way for more Tesla Semis to hit the road as the company expands its manufacturing capacity in Nevada.
Tesla’s real-world data for the 2026 Tesla Semi showcases impressive performance, with the truck achieving 1.64 kWh/mile while hauling a full 82,000 lb load. By extracting 500 miles out of an 822 kWh pack, Tesla has set a new standard for long-haul logistics, challenging traditional diesel economics in the process.
Overall, the unveiling of the official battery specifications for the 2026 Tesla Semi signifies a significant step forward in the electrification of heavy-duty vehicles. With its high energy density, impressive power output, and long-range capabilities, the Tesla Semi is poised to revolutionize the transportation industry and pave the way for a more sustainable future.