Good on Google.
Finland has low emissions from electricity :
https://app.electricitymaps.com/map/all/yearly
71 gC02eq/kwH
France, Sweden and Norway look like good places for data centres in Europe too on the basis of low electricity emissions.
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At least Sweden is struggling a lot with scaling its power production, to the point where it's a problem for existing and new industries and causing some rather extreme price volatility.
A lot of the green energy is from hydro dams and you can't really add new rivers to the geography to support additional industry.