The conference hotel KolleKolle is one of the few establishments that have been Green Key awarded for over 20 years. During the visit of Green Key International, Berit K. Leth – the hotel’s General Manager, explained that the Green Key criteria is part of the establishments DNA since its first award in 1996. 

The hotel proudly presents their sustainability history and achievements on a timeline in the lobby of the hotel where guests can go back in time and learn about KolleKolle's exciting journey to become one of the most sustainable hotels in Denmark. 

KolleKolle was built 1972 – i.e. before the 1973 oil crisis. Back then, there wasn't much emphasis on energy efficiency, which also influenced the way buildings were constructed. The hotel is still struggling with the decisions made in the past, but is therefore even keener on saving as much energy as possible, both on a daily basis and when extending or renovating the hotel.

In addition to showcasing their sustainability story, the Green Key working group of the hotel, which consists of one representative from each department, has created a "sustainability book" that links Green Key to the many environmental initiatives of the hotel.