The first impression of Denmark’s renewable energy programme for visitors arriving by air is of a country obsessed with wind energy. As our plane descends over Jutland and the south Kattegat Sea, it’s easy to form the view that wind power is the only Danish renewable energy source as onshore, nearshore and offshore wind farms form a pervasive turbine network across Denmark’s land and seascape.

But should visitors take time to call in to the State of Green headquarters in Copenhagen, they will hear that while wind energy has transformed the Danish renewable energy economy, bioenergy, from biomass, is still the main renewable energy source (Figure 1).