In article .com,
Wind power, tidal power, geothermal power, Earth-based solar power, and
fission reactors (more of which are being built right now) are all far
more cost-effective than anything that has to be launched into space,
maintained in space, replaced in space when it wears out, etc. etc.

If you assume today's costs of doing things in space, that's certainly
true.

Of course, any attempt to obtain serious amounts of power from space will
utterly dwarf today's space programs, so assuming that its costs will be
similar is ridiculous.

Oh, and don't forget the costs of the storage systems you need for wind
and Earth-based solar, and the fact that tidal and geothermal are
cost-effective in only a few particularly favorable places, and the limits
imposed on fission by uranium supply.
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