Are there regulations in the US that you need to fund decommissioning up-front? I think that's the case in the UK at least.

Yeah, there's a lot of stuff for nuclear. I wrote to the government to get them to remove 10 CFR Part 20 Subpart E financial requirements but obviously that hasn't happened. You can start from there and branch out.

Don't think so but after seeing electricity prices rise and even double in areas by giant data centers many areas are requiring them to provide their own power