Upvote:5
The airline is not obliged to give compensation under EC 261 in an extraordinary circumstance. De-icing is not an extraordinary circumstance:
Good news for passengers: de-icing is not an extraordinary circumstance. Although airlines have in the past argued that it is, a district court in Germany ruled that airlines have to compensate their passengers. Flight-delayed.co.uk think that is a fair point. Airlines might not be able to control the weather, but they can control the organisation that surrounds the process of de-icing and getting the big birds aloft once more.
(Source)
Therefore, if under EC 261, you can request compensation.