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Unless there has been a breakthrough in the technology, I understand that photovoltaics are big users of rare earth elements. A major bi-product of mining thee is - Thorium . Because Thorium is radioactive, this waste is very problematic, so finding a productive use for it would be very helpful.

Rare Earth mining is almost exclusively controlled by the Chinese, which might also be seen as a vulnerability of a technology upon which to base your future energy policy - Thorium, however, is plentiful everywhere.