You’re assuming a large enough supply that can absorb demand. This is true in China but not generally in the West.

If supply was just in time constructed so you maybe have only like 10-30% extra vs peak, the 50% of a nuclear power plant shifts the preexisting non-Google demand onto the non-nuclear sources as the plant can no longer meet its non-Google demand. It’s generally no different than if Google acquired that electricity from the available mix rather than the plant directly.

The thing it gives them is the ability to meet their individual net-0 targets (and thus government incentives) - a local optimization at the cost of a global net negative (at least as far as carbon electricity sources goes)

This is a case where the supply was about to be gone and Google provided funds to keep it operating (the original nuclear reactor began operation in 1977 and it now needed EUR 700M to extend the service life). And one can probably guess that this supply just wasn’t cost competitive in the first place, but Google increased the demand so much that it now becomes cost competitive.