"The larger European grid provides the backup needed for wind power's erratic performance. In addition, the country exports nearly half of the wind power it produces, largely because it comes at the wrong time - when it isn't needed. When the country needs additional power, it's forced to pay premium prices. Denmark, Michaels says, has the highest power bills in Europe."
It is my understanding that when "…. the country exports nearly half of the wind power it produces…" Denmark exports to the Norwegian and Swedish grids and Norway and Sweden use that wind-generated electricity instead of dropping water in their respective hydro systems. Thus, in effect, 'storing' Denmark's wind generated electricity.
Haroldx