The problem with nuclear power generation today is it's always way more expensive than promised, in often unpredictable and sometimes not-easily-quantifiable ways. Add the uninsurable nature, the constant risk of human error/decision making increasing the risk factor (eg. not decommissioning old plants), and waste problem, and it gets even less attractive. Meanwhile, renewable energy and power grid improvements continue to be underfunded, and everyone claims the only alternative is coal.
It's not inherently more expensive than promised; that's caused by a combination of first-of-a-kind construction and unpredictable political and regulatory situations. In places like South Korea, where they have a more reasonable regulatory situation and they build a bunch of each type of plant, they've had a better track record with completing nuclear plants on time and within an affordable budget.
