Which nuclear power technology for the near future?

[gmaz]

I was surprised to hear Farage mentioning SMR reactors in an interview and it may be one thing I agree with him on, but if it is a viable technology, why aren't GE or Rolls Royce producing them? Are there other zero-carbon technologies that can support the grid?

Thorium reactors - lots of optimistic youtube videos about them but none built as far as I know
Natrium - Bill Gates has invested with TerraPower
Fusion - I said "near future"
SMR - where are they all?