So most of the wind electricity Denmark generates has to be exported, through interconnection cables - to Germany, to balance the fluctuations in that country's own wind carpet, or to Sweden and Norway, whose entire power system is hydroelectric, and where it can be stored. (The Swedes and Norwegians use it themselves - or sell it back, at a profit, to the Danes. If they use it themselves, there is, of course, no saving whatever of C02 – because all Norway and Sweden's domestically-generated hydropower is carbon-neutral anyway.)