>
>Hmm.  Sounds inherently ineffecient unless they spend a lot of money on
>thermal insulation.  Otherwise a good portion of the energy will go into
>heat into the rock when air is pumped.  The rock will then be cooled
>slightly when the air is released.

Pump cold winter air into a nice relatively warm cavern, stir it around for
a while, and... :)

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I would have a link to http://www.findu.com/cgi-bin/find.cgi?KC6ETE-9 here
in my signature line, but due to the inability of sysadmins at TELOCITY to
differentiate a signature line from the text of an email, I am forbidden to
have it.

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