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I'm not sure what the cost of PV material is in bulk, but current
commercial panels ARE NOT cost effective (at $4 or more per KW).
Then
there is the 20-25 year lifetime of the panels--versus 60 years plus for
nuclear or coal generated electrical plants.
the AREA needed to supply the world's current (or better yet projected 2-3x
current) TOTAL energy demand and see if that is reasonable.