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First, are you suggesting there are no fault lines or geothermal areas that can be exploited for geothermal energy in north america? Second, you strangely invoke "economies of scale" as a reason windmill energy will saturate and can't grow anymore. Economy of scale has the opposite effect. The more windmills you build, the cheaper they become. That only leaves the question of where to put them, and there's no shortage of unused tundra in many areas.
Then you (indirectly) invoke economy of scale as a reason why nuclear makes sense. There are only two reasons why nuclear power even APPEARS to make as much economic sense as it does. a) the U.S. government poured billions of dollars into developing the technology for military purposes in the 50s, making it "economical" for civilian purposes as well. The same could be done for any other energy source including geothermal, windmill, solar, tidal, and even sewage to methanol conversion and sea-weed cellulose to ethanol conversion. And, b) because the long term cost of disposing of the nuclear waste is NEVER factored into the equation. Sure, if you just want to dump it into the Black Sea and hope nobody notices, it makes economic sense. If you want to be more responsible with large amounts of nuclear waste that will be hazardous to human life for thousands of years, large scale nuclear power looks less and less economical, not to mention SANE.
You mention France, which generates most of its power from nuclear, but you don't mention the French problem with nuclear waste disposal. A problem which they haven't even started to address. You might have half an argument for nuclear if they can find a way to make fusion rather than fission reactors, but I don't see this happening.
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