The photograph Tesla posted to X on Wednesday showed a sea of workers in a cavernous Nevada factory, with the blunt silver nose of an electric truck barely visible at the back of the frame. The caption read simply: “First Semi off high volume line.” Nine years after Elon Musk stood onstage and promised a revolution in long-haul freight — and seven consecutive missed production deadlines later — the Tesla Semi has begun rolling off an industrial-scale assembly line for the first time. The milestone, confirmed Wednesday by the company, represents more than a manufacturing achievement. It signals a potential structural shift in North American trucking, a $900 billion industry that has run almost exclusively on diesel since the Interstate Highway System was built, and which has watched the electric vehicle wave crash over passenger cars while leaving heavy freight largely untouched. “The pilot units that PepsiCo drove for four years were the proof,” said one industry analyst who has tracked the program since its unveiling. “This is the product.” A Factory Built for Scale The Semi is now being produced at a dedicated 1.7-million-square-foot facility adjacent to Gigafactory Nevada in Sparks, a plant Tesla spent years constructing while its electric truck program remained in a kind of suspended animation — outpaced by the demands of its passenger car business and constrained by battery cell shortages. That bottleneck has been addressed with characteristic Tesla verticality. The 4680 battery cells that power the Semi are manufactured within the same complex, eliminating the supply chain dependency that forced the company to deprioritize the truck for years while it allocated cells to the Model 3 and Model Y. The factory is designed for an annual capacity of 50,000 trucks — a figure that would represent roughly 20 percent of the entire North American