Four men have been arrested on suspicion of aggravated trespass this morning.
They were arrested by police after climbing down from a chimney at West Burton power station.
Police say ten people are still 300ft up one of the chimneys where they have been protesting.
On Monday a group of around 30 people gained access to the power station in Nottinghamshire and climbed 300ft tall chimneys to protest against the use of fossil fuels.
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Education Secretary Nicky Morgan was heckled several times during a speech to the National Association of Head Teachers annual conference.
Showers gradually fading away this evening, leaving a largely dry, clear and chilly night, with some patchy fog and frost forming.
A dry, bright and sunny start to the Bank Holiday weekend for most.