To have more nuclear power now the plant constructions would have needed to take place starting 30ish years ago, to account for the 15 year lead time per unit a

To have more nuclear power now the plant constructions would have needed to take place starting 30ish years ago, to account for the 15 year lead time per unit and to space apart the large number of construction starts to get an appreciable number of them operational. To have better renewables in the counterfactual r&d scenario, the earlier we diverted the resources the better acceleration payoff it would have had, ideally in the 50s to 70s.