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'Limitless' energy: how floating solar panels near the equator could power future population hotspots
(theconversation.com)
This is a most excellent place for technology news and articles.
Half a trillion dollars over seventy years is nothing. How large is the waste site compared to the habitable surface? A few square kilometers is nothing.
The power needs of a small country is also essentially nothing over a seventy year span.
Nuclear energy is not ideal but it beats the hell out of coal plants, and it gives us a bridge to something sustainable. Solar has its own drawbacks and no nation is going to maintain a bunch of floating panels out in the ocean.