Just one note, nuclear power plants run at around 35% efficiency. This is because they are basically steam generators and tend to not push as hard for safety. I think they can get up to 40-45% with combined cycles and such, but then we are in the “very large” territory

Large scale data centers, like the ones that end up in the news for FAANG are ~100 megawatt footprints.

I have no idea where you’re getting 3.4 megawatts as the largest data center in the US, but that is wildly undersized.