Estonia does seem to be really dirty in it's electricity production. We here in Finland could also do better at around 50% fossils. Denmark is around 60% wheras US and UK are at 76%. I wish we could all be more like Sweden, Norway and Iceland, with around 5-7% only.
Estonian electricity production not only seems dirty, but it is really dirty. But...
This table is about production, not about consumption. Therefore our neighbour Latvia has a very nice result, but if to take into account, that Latvia uses quite a lot of electric power that is produced in Estonia, then their picture is not so beautiful anymore. Finland uses Estonian electricity quite often too.
My point is, that you should look wider picture. If some nuclear plant in Finland will get into accident and will pollute whole region, including Estonia, then we see, how clean Finnish electric vehicles really are. I do not expect, that you consider that electric cars in Fukushima are cleaner than in Narva.