Designer Gregor Aisch has a look at energy usage in Europe. Click on a number of topics on the bottom to see how each country compares, or mouse over a specific country to get its details. Bubbles are color-coded according to relatively high or low levels (I think) and sized by population (I think). There isn't a whole lot of explanation of what you're actually seeing, but it has some interesting interactions in there. Maybe our European readers can add some context. Don't forget to take it fullscreen and put it on autoplay.