No one's using the SMR's that are proposed here either. They're hoping to get the first one online in 10 years. A lot of nuclear fans get excited about unproven future tech when it comes to nuclear and then dismiss non-nuclear alternatives for being unproven future tech.
- Renewable are great, but our current political economy just likes them because they don't require coordination and are marginally cheap. But when trying to do a completely renewable economy, those benefits dissipate when we need electricity storage or arbitrage/rationing on a huge scale, and that requires good good old coordination and politics again.
- Regular nuclear power plants are great but the anglo-sphere can't do them for the same reasons they can't do subways.
- Tiny nuclear power plants aren't intrinsically better at all, but perhaps can both have reneweable's ability to accommodate our shitty political economy, and maintain that ability all the way to 100% no fossil fuels for electricity.
There's nothing great here, just a last ditch to throw technological band-aids on social issues.
The unproven bit is the use of factories to make Lego-like peices for the construction.