Unsubsidized on-shore wind and solar is the by far cheapest sources of energy today. They are down at the marginal cost of existing, paid of, traditional power plants. That is where the current explosion in renewable growth is coming from. It is simply a more efficient use of capital to close down your existing nuclear plant and build new renewables instead.

https://www.lazard.com/perspective/levelized-cost-of-energy-...