The full vehicle park came two days after Tesla sued the health department seeking to overturn the order, and chief executive Elon Musk threatened to move Tesla's manufacturing and headquarters operations out of the state.
The company referred to an order on Thursday by California's governor allowing manufacturers to resume operations and said that as of Sunday, previously furloughed employees were back to their regular employment status.
Elon Musk says Tesla will move its Californian headquarters to Texas and Nevada as the billionaire becomes increasingly frustrated with lockdown measures in California.
Pan reportedly said of Tesla: "We have not given the green light".
Tesla Inc.'s (NASDAQ: TSLA) CEO was the subject of California State Assemblywoman Lorena Gonzalez's ire after he threatened to move the factory out of the state.
Earlier in May Tesla shares saw $14billion wiped off their value after Musk tweeted that he thought Tesla's stock price was too high. In Alameda County, which is home to Tesla's Palo Alto headquarters, officials last month extended the county's stay-at-home order through May 31. "However, the County's position left us no choice but to take legal action to ensure that Tesla and its employees can get back to work".
Musk, who sparred with California officials in March over whether Tesla had to halt production at Fremont, had criticised the lockdown and stay-at-home orders, calling them a "serious risk" to United States business and "unconstitutional".
The plan reportedly would bring back almost 30 per cent of factory workers to the Fremont factory as early as Friday.
More than 1.3 million confirmed cases and more than 78,000 deaths have been recorded in the U.S. since the start of the outbreak.
"I have more confidence moving forward in our ability to support a company that this state has substantively supported for now many, many years", Newsom said. He called the closure of Fremont a "serious risk".
Big picture: Tesla's Fremont, CA, factory is considered the crown jewel of its global manufacturing operations.
Tesla CEO Elon Musk is escalating his fight with officials in California as he seeks to restart production at the electric automaker's Fremont factory.