Local police were braced on Saturday for further protests at the Tesla factory site in Grünheide near Berlin, following violent clashes the previous day.
"We are sensitized," said a police spokesman. The situation had been calm during the night and in the morning, he added.
A citizens' alliance is planning a protest march from a nearby railway station to the Tesla factory in the afternoon. According to the police, the local A10 motorway junction has been closed in both directions. The police advised drivers to widely avoid the area.
On Friday, there were repeated clashes between protesters and police officers as activists tried to enter the site. The police used pepper spray and batons. According to the police, several participants in the protests and 21 police officers were injured. Sixteen people were taken into custody.
Tesla did not initially comment on the protests. No production took place at the plant on Friday. However, a company spokeswoman said this was because employees had been granted a day off following a public holiday on Thursday.
A large contingent of police was deployed, including hundreds of reinforcements brought in from other German states.
Two spokespeople for various protest groups involved criticized the "disproportionately brutal" actions of the police. The protest, which began on Wednesday, is set to continue until Sunday.
The Grünheide car plant is the only Tesla plant set up by Elon Musk in Europe.
The protests are directed against Tesla's planned expansion which is to include a freight depot and would require forest to be cleared, as well as criticizing the production of electric cars in general.
During a public consultation in Grünheide, a majority voted against the expansion, after which the municipality and Tesla signalled that less forest should be cleared.
Activists have set up a protest camp near the car plant, occupying tree houses there since late February. The US e-car manufacturer had to stop production at the Grünheide factory for a few days in March after an arson attack on an electricity pylon. A left-wing extremist group claimed responsibility for the attack.
