Demonstrators and police have been involved in repeated standoffs since the camp opened. Protesters have accused police of being heavy-handed, while officers said they were forced to use riot shields in clashes yesterday.

Beautridge defended the police’s actions in entering the camp to remove obstacles to two access points, saying officers “will not compromise on safety”.

Campaigners are protesting against proposals by the plant’s owners, Eon, for a coal-fired facility - the first such plant to be built in Britain for over 30 years. More than 1,000 protesters are expected to try to shut down the power station in a planned day of mass action on Saturday.

Twelve people were arrested yesterday. Seven have been charged with offences including possessing a blade, driving without insurance and obstructing and resisting a police officer.