* Price differences during day/week/seasons. Cold day? Electricity can be 2-3x higher than the day before. Lots of sun/wind? Price plummets. ...
* Price differences in regions. Norway, Sweden, Germany, those alone have huge differences in electricity prices depending on where you live.
* Pricing relative to economic output, i.e. GDP. Or household income.
There are surely more. This really strikes me as a propaganda page as the data is too oversimplified to be usefulfor real discussions, but enough to point to it to further an agenda. ("See, we shouldn't have turned off those nuclear plants, see how expensive electricityhas become!")