Most of the cost of nuclear power is in building and demolishing the plant, not in operating it. So if you plan a plant now to go operational in 10 years and run for the next 50, you are locked in to producing electricity for (amortized) $60/MWh for the next decades. Or shut it down early and eat a giant loss, if the projections for solar, wind and storage costs become true. That's a hard sell when you also have the option to build a wind farm in 5 years or a solar installation in two, decommission them after 20 years and repeat with whatever is the most cost effective then.

Time will tell if that hypothesis remains true, but inflation is a thing. What you build now with an amortizing cost over decades may weight much cheaper on your debt than you thought.

In that aspect, if you're a state actor, paying more to get lower maintenance costs is usually a good choice.