The office did not give further details of the partners or disclose the shareholder structure of the planned joint venture, but according to reports in The Shanghai Securities News and the South China Morning Post, it is reported that FWD would take 51% of the venture, the maximum China would now allow under the new policy introduced by the Chinese government recently.
It was not clear if the new firm was related to the anticipated Shanghai plant.
Tesla's aspirations to build a factory in China has been well-known.
Tesla has set up a new wholly owned company in Shanghai, moving a step closer to producing its electric vehicles in China and establishing its first gigafactory outside U.S. shores. The Chinese market contributed $2 billion, up 90 percent.
The Chinese government uses the term NEV to designate plug-in electric vehicles eligible for public subsidies, and includes battery electric vehicles (BEVs) and plug-in hybrid electric vehicles only.
Musk has been critical of China's tough rules for foreign businesses, saying they created an uneven playing field.
The move came after Tesla founder and CEO Elon Musk said earlier this month that it plans to announce the location of a "gigafactory" in China as early as the third quarter of this year. The only shareholder is Tesla Motors HK Limited.
China announced in April that it would scrap share-holding limits for new energy vehicles for foreign investors in 2018.
Beijing has set an ambitious target, whereby new-energy vehicles will account for a fifth of total sales by 2025.
The Palo Alto, California-based company has been working with Shanghai's government since a year ago to explore assembling cars in China.