Much of Europe is on the same shared grid, so energy prices goes up everywhere when Germany cuts nuclear power. Unless there is sufficent energy available to replace it. (Spoiler: There aren't)
They might share a grid but the prices differ massively between countries, sometimes having a 200-300% difference as is the case with Finland and Germany.
Most of the end-user energy prices differences are due to local tax differences.
Despite the email only mentioning German electricity prices we got it for a Finland server. 5.8% increase.
We recently sent out an email correcting this. The prices for Auction servers will not increase in Finland. --Katie, Hetzner Online