The problem is capital doesn't care about the big picture. Nuclear power is an upfront costly measure, you don't see a return for perhaps decades. That's fine if you are a public agency since in time, this will pay for itself, and the concern is about bettering the public in the best way possible, not making a quick return on investment.

It's not fine if you are a private energy company with shareholders who are looking to take on a gain and who are only looking at life one quarter at a time. Executives would rather invest in something cheaper where their investors will see a quicker return, because that's how executives keep their jobs. Executives and shareholders care about themselves and their profit, while the government is designed to care about the collective, although its great power is frequently commandeered by individuals seeking personal profit.