For over 90 hours in 2013, wind supplied more power than the country needed. This peaked at 122 percent of energy needs at 2 a.m. on October 28th. If the 2020 plan succeeds, Denmark could end up hitting 1,000 hours of surplus a year.
What do they do with this extra energy? They don't store it yet because it's easier to just build a bigger grid and give it to neighboring countries. Denmark is part of an integrated regional grid with the Scandinavian countries and parts of Germany, so it trades energy with them. Norway supplies a lot of energy with its hydro plants.
They will eventually need to start storing the energy. Denmark plans on being completely off of fossil fuels by 2050, and Germany's power company thinks that once renewables hit 70 percent of the power supply, storage will be needed.
Many countries are anxiously waiting to see what happens with Denmark. They are both innovators and their own test subjects. Hopefully all goes well and the rest of the world follows their example.
