Sharjah24 - Reuters: Tesla operated its Shanghai plant well below capacity on Tuesday, showing the problems factories face trying to ramp up output under a tightening COVID-19 lockdown, while China's capital kept up its fight with a small but stubborn outbreak.

Many of the hundreds of companies reopening factories in Shanghai in recent weeks have faced challenges getting production lines back up to speed while keeping workers on-site in a "closed loop" system.

Even if they manage to get everything right, such firms depend on suppliers facing similar challenges.

The latest sign of the struggle trying to increase output under COVID rules came at Tesla's Shanghai plant, where a resumption of work three weeks ago got extensive state media coverage as an example of what can be achieved despite restrictions.

The U.S. automaker has halted most of its production at the plant due to problems securing parts, according to an internal memo seen by Reuters.

Tesla had planned as late as last week to increase output to pre-lockdown levels by next week.

Among Tesla suppliers facing difficulties is wire harness maker Aptiv after infections were found among its employees, sources said on Monday.