New United Motor Manufacturing, Inc. (NUMMI) was an American automobile manufacturing company in Fremont, California, jointly owned by General Motors and Toyota that opened in 1984 and closed in 2010. After the plant was closed by its owners, the facility was sold to Tesla, Inc. and reopened as a 100% Tesla-owned production facility in October 2010, becoming known as the Tesla Factory. The plant is located in the East Industrial area of Fremont next to the Mud Slough between Interstate 880 and Interstate 680. NUMMI yearly production peaked at 428,633 vehicles in 2006. History Background Before NUMMI, the site was the former Fremont Assembly that General Motors operated between 1962 and 1982. Employees at the Fremont plant were "considered the worst workforce in the automobile industry in the United States," according to a later recounting by a leader of the workers own union, the United Auto Workers (UAW). GM as a company was departmentalized (design, manufacturing) as per Henry Ford's division of labor, but without the necessary communication and collaboration between the departments. There was an adversarial relationship between workers and plant supervisors, with management not considering the employees view on production, and quantity was preferred over quality. Like all American car plants, the production lines at Fremont seldom stopped, and when mistakes were made cars continued down the line with the expectation that they would be fixed later. By the early 1980s, the adversarial relationship had deteriorated to the point where employees drank alcohol, smoked marijuana (at the time, an illegal activity), were frequently absent (enough so that the production line couldn't be started), and even committed petty acts of sabotage such as putting "Coke bottles inside the door panels, so they'd rattle and annoy the customer." Attempts to discipline workers were often met with grievances or even strikes, putting the plant into near-continuous chaos. By 1982, GM had had enough and closed Fremont Assembly and laid off its thousands of workers. Transforming Fremont Assembly into NUMMI At about the same time, GM was struggling to profitably build high-quality and fuel-efficient small cars that consumers demanded after the energy crisis of the 1970s. Consumers started turning to foreign automakers for these vehicles, prompting the U.S. Congress to consider import restrictions to protect the domestic auto industry. That led GM and Toyota to team up and create New United Motor Manufacturing, Inc. (NUMMI), a joint venture to manufacture vehicles to