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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Sunday will be windy with sunny spells at first.
Sunday's looking dry with sunny periods.
Paramedics had to take the boy to a hospital 18 miles away from his home following the closure of a local children's A&E.