Greenpeace activists climbed a 180-metre (590 feet) chimney at a power station in Belchatow, central Poland, on Tuesday to protest Warsaw's coal policies ahead of UN climate talks this month.
The state-run plant is Poland's biggest power producer, Europe's largest polluter and one of the biggest coal power plants in the world.
Nine activists climbed an internal ladder to the top of the conical chimney at the plant, which is fuelled by lignite and belongs to PGE.