Oh thats easy.
Nuclear has been frighteningly unreliable
See
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0ahUKEwjg9Nir1OTLAhUD72MKHa3sD1UQFggiMAE&url=http://www.greenpeace.org/international/en/news/Blogs/nuclear-reaction/nuclear-power-reliably-unreliable/blog/50384/&usg=AFQjCNHO1Z05W2ec6MdP0MpeDYOyPKePwQ&sig2=OCfLj21xxuMFbv0HxNqb5g&bvm=bv.118353311,bs.2,d.amc
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What fills the energy gap while these "reliable" nuclear reactors are shut down?
Belgium is having to rely on electricity from its neighbours. So much for nuclear power giving the country energy security.
In the UK, things are much more optimistic. Renewable energy has come to the rescue. "Demand is low at this time of year, and a lot of wind power is being generated right now," said the UK's National Grid. Electricity supplies have been unaffected.
What lessons can we learn here?
Firstly, the idea that nuclear power is a reliable energy source that offers energy security is a myth, particularly in a world where aging nuclear reactors are coming to the end of their lives.
Secondly, we see a reversal of the view that renewables need to be supported by nuclear power. Although nuclear and wind power do not have the same generation characteristics, nuclear reactors now needing to lean on renewables means the nuclear industry has a big problem.
More and more nuclear reactors will be closing in the coming years as they reach retirement age. The nuclear industry simply can't build replacement reactors quickly or cheaply enough to fill the gap.
That's a gap that renewables and energy efficiency can exploit safely and reliably.
As the recently released 2014 World Nuclear Industry Status Report says…
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As for Coal and natural gas they are just more of the same carbon based fossil fuel sources. Exactly the source of the problem in the first place.
Your essentially advocating for the reliability of the problem. When the rest of the world recognizes the need for a reliable solution. Which has been found in renewables.
While the naysayers point out that the sun is only shining half the time. Its always shining somewhere ;--) Same for the wind. The worlds wind patterns are actually quite steady.