Nottinghamshire Police say a protest by 15 campaigners, staged inside two chimneys at West Burton power station near Retford, is costing £20,000 a day to police.
The campaigners say they plan to camp inside the chimneys for a full week and this morning have taken to flying kites and tweeting pictures.
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Tonight will stay dry for most. There will be clear spells this evening leading to a chilly night to come.
Most places will be dry through the evening and night with broken cloud.
The Red Arrows have touched down in China ahead of their first ever air display in the country.