Martin Eberhard Turns to AC Propulsion’s tzero in February 2003

In February 2003, Martin Eberhard’s search for a high-performance electric sports car led him to AC Propulsion, a California electric-vehicle engineering company known for the tzero prototype. The tzero was a small electric sports car that challenged the idea that electric vehicles had to be slow or purely practical. Eberhard and Marc Tarpenning both drove or examined the tzero before founding Tesla Motors, and the car became a direct reference point for the Roadster concept that followed. Eberhard wanted AC Propulsion to turn the tzero into a commercial production vehicle. AC Propulsion’s leadership, including Alan Cocconi and Tom Gage, declined to pursue that path, choosing instead to focus on other electric-drive projects. Sources differ slightly on the exact timing of the lithium-ion tzero conversion, with some accounts placing the conversion work from March to September 2003, but the key sequence is consistent: Eberhard backed or encouraged a lithium-ion version, pushed AC Propulsion to commercialize it, and then moved with Tarpenning toward forming a new car company when AC Propulsion declined. The technical idea behind the tzero mattered because it connected sports-car performance with lithium-ion battery cells, the kind used widely in consumer electronics. Eberhard’s earlier work at NuvoMedia had exposed him to battery-powered consumer products, and he believed those cells could make an electric sports car practical. The tzero showed that an electric car could offer acceleration and range that appealed to performance-focused buyers, not only efficiency-focused drivers. This February 2003 moment became one of the immediate steps before Tesla Motors was incorporated on 01/07/2003 by Martin Eberhard and Marc Tarpenning. The company’s first vehicle, the Tesla Roadster, would later draw inspiration from the AC Propulsion tzero and the same basic market idea: start with a premium electric sports car before moving toward broader electric-vehicle production. Why This Moment Matters:AC Propulsion’s refusal to commercialize the tzero helped turn Eberhard and Tarpenning from interested customers and advocates into founders. Their next step was not to wait for an existing automaker or supplier, but to create a company around the electric sports-car concept themselves. #MartinEberhard #MarcTarpenning #ACPropulsion #Tzero #TeslaOrigins #ElectricVehicles #TeslaRoadster