Protesters said they will take down fences to shut down a power station
Activists have vowed to tear up fencing in an attempt to shut down a Nottinghamshire power station during a planned environmental protest.
Camp for Climate Action said direct action was needed to get urgent decommissioning of power stations.
A film on the group's website advertising this weekend's protest at Ratcliffe-on-Soar shows members tearing down fences using crowbars and hammers.
Police said they are confident the protest will be kept under control.
New fences have been erected at the station and security increased in preparation for Saturday's demonstration.
The protesters' film starts with the words: "The Great Climate Swoop will shut down Ratcliffe-on-Soar power station.
"They have put up a fence but we can take it down and jump fences."
Ch Insp Linda McCarthy, from Nottinghamshire Police, said: "We will explain what's expected and what they can and can't do.
"I'm confident our response will be proportional."
A 21-year-old man was arrested on Wednesday on suspicion of conspiring to damage property at the power station. He has been released on police bail pending further inquiries.
He has been bailed to attend his local police station in Leeds on Saturday.
The E.ON station supplies power to around three million East Midlands homes.
Protesters want coal-fired power stations closed down in favour of more environmentally-friendly options.
Activist Ed Thompson said: "This station is going to be open for the next 30 years under current plans, but science says we have to start decommissioning power stations as soon as possible."
E.ON said plants that do not meet environmental targets are already being closed.
Emily Highmore, from the firm, said: "We are also working on making them lower carbon, but we can't just shut down power stations because we don't like them - we have got to keep people's power on."
Staff will sleep at the plant over the weekend to ensure continuing power for homes.
Protesters want coal-fired power stations closed down