Yeah, firstly, nuclear power gets ongoing subsidies, which if you close those plants down, are obviously freed up for re-investment. The reality is that in Japan some plants will close, others will not. The old and unsafe ones should absolutely close down.
Unsafe...

This hysteria would be mildly amusing, if it wasn't so dangerous.
Secondly, dismissal of wind power as a major, mature and reliable source of power can only be based on ignorance.
I've already posted in this very thread about the lifetime levelised cost-competitiveness of wind power, and putting one's hands over one's ears and shouting "intermittency" like people haven't thought of that is silly. And shows a misunderstanding of what "base load" actually is.
Which is not what I am doing. I am saying that wind power can never cover 30% of Japan's energy needs, not without astronomically high investment that would probably increase the price of electricity in Japan so much that the country's export industry would suffer.
It's not a coincidence that the countries which have invested the most in this type of energy have the highest price of electricity in the world (e.g. Denmark, soon also Germany. France on the other hand has very cheap electricity - surprise surprise.)
Thirdly though, "safeguarding the existing nuclear power plants against the kind of disaster Japan experienced last year and building new, safer ones in the future is much more sensible course of action" kinda costs lots of money anyway.
Well, duh. I said that it makes far more sense to invest money into developing an
existing asset than building a castle in the air.
Nuclear power is very expensive to set up or modify, and not getting any cheaper as regulations tighten (its capital costs per unit of lifetime output are already higher than wind and it also has ongoing fuel costs, unlike wind).
Claims claims. And the Fukushima screw-up had nothing to do with the reactor itself, it was a failure of the secondary electric generator used to provide power for the reactor mechanisms in case of emergency. For some reason, nobody thought it could be damaged by a tsunami. That is a criminal oversight, but hardly a reason to abandon nuclear energy in a stupid knee-jerk response.
Contrary to the beliefs of renewable energy fanboys, nuclear energy is developing and each generation of reactors are better, safer (if that's even possible, given that they already are much safer than any other source of energy), and cleaner. With proper reprocessing of nuclear fuel, you can squeeze a lot of energy from the same load of nuclear fuel, thus reducing the overall fuel requirements.
Japan's gotta spend lots of money here regardless, even if they decide to stick with all their current nuclear power plants (including the vulnerable and damaged ones).
Far less if they choose the sensible option - going with what they already have.
And given the abundant wind and geothermal energy available and not being tapped in Japan (and given that Toshiba and Marubeni jointly have well over 50% of the geothermal technology market), they'd be pretty stupid not to follow through on their current push in those directions even alongside a nuclear presence reduced to the safer and newer plants.
By all means, if it's
economical, develop it. Not at the expense of a proven and reliable energy source because people are irrationally afraid of something, though.
Edit: Oh and finally, on energy security, Japan already gets most of its uranium from us and Canada anyway, so I'm not sure how nuclear represents energy security anyway. Particularly when you dismissed LNG exports from here on those very grounds?
You need far less uranium to deliver the required amount of power to the grid than LNG, coal, oil, or the other fossil crap. And as I said above, nuclear "waste" can be reprocessed and used again, only a few percent of it is actually spent. Japan should invest into that, and then actually increase the share of nuclear in its energy portfolio.
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Anyway, less talk, more graphs: