As of Tuesday, 251 enterprises have gone back to work with more than 40,000 employees under the closed-loop management system in Shanghai's Lingang New Area of the Shanghai Pilot Free Trade Zone, home to Tesla's Gigafactory in China, a local official said on Wednesday after the authorities released a "white list" to help staff of key enterprises return to work.

Wu Xiaohua, a senior official from the Lingang New Area, made the remarks during a press conference on the full support provided for enterprises to promote the resumption of work and production, adding that 188 firms in the city's Yangshan Special Comprehensive Free Trade Zone and its logistics parks have returned to work.

Moreover, 555 construction sites are expected to resume work before May 20, when the resumption rate is expected to reach 95 percent.

Wu noted that the area has promoted the full resumption of work and production upstream and downstream in the industrial chain of the city. On April 18, Chinese automaker SAIC's factory in Lingang executed a test for resumption of production and the day after, Tesla's factory officially resumed production with 8,000 employees on duty and a daily output of about 1,200 vehicles.

Nearly 20 enterprises, like semiconductor technology companies ZINGSEMI and GTASEMI, and energy equipment company Shanghai Electric Group, have implemented the closed-loop system on the production and R&D facilities with about 25,000 employees resuming activities. Additionally, eight integrated circuit major projects, including the development of the GalaxyCore chip, have returned to work.

According to Wu, the free trade zone has called on more than 100 upstream and downstream suppliers in the Yangtze River Delta and the city's industrial chain to resume work and production simultaneously.

In addition, the area has set up a material transfer station of 20,000 square meters to receive and deploy aid basic supplies from other sites across the country. So far, the station has received 410.39 tons of aid materials to Shanghai.

Wu noted that the local government has issued 12 measures, including fighting the epidemic, enhancing financial support and optimizing services to invest nearly 80 million yuan ($12.1 million) of new financial resources and 210 million yuan ($32 million) of rent exemption for state-owned enterprises.