The reason that isn't done in any election is because, to prevent people from voting twice, each voting station needs a list of the people that are supposed to vote there.
In Spain you don't have to register to vote every time. Just show up at the place you have to, based on the census.
I'm asking why can't you be told where to vote - the original thing the article is about - based on your postcode only. But I think I have my answer in another thread.