This is basically due to Google probably rightly believing that electricity price in Finland is going up due to all these datacenters and also a pr stunt that the current government loves because they can claim that they aren't allowing these datacenters to raise electricity price. This isn't investing in power infrastructure in any way, there is no reality where that nuclear plant wasn't staying in operation as long…
> they aren't allowing these datacenters to raise electricity price If you reduce supply,price generally goes up. Buying a power plants output reduces supply
You buying a doughnut - even half the doughnuts - from a doughnut shop does not increase the price of the remaining doughnuts unless they can't make enough to satisfy remaining demand and people are willing to outbid you rather than wait.
Does that power station have enough capacity to satisfy the remaining demand?