user2229: I would like to know whether any work known to bitcoin community, related to 'green mining'. As power consumption is main cost factor in mining, alternate energy sources like, solar / wind powered rigs could also be possible. Thanks.

user153: One attempt, .... Diablo Mining Company didn't go so well.

http://bitcointalk.org/index.php?topic=77469

So far, the most profitable mining has been in nations whose taxpayers provide subsidized electricity.  Essentially, it is like a form of welfare for Bitcoin mining entrepreneurs.
ASICs have removed that advantage though so it never got to be that big of a deal.

2229: <p>I would like to know whether any work known to bitcoin community, related to 'green mining'. As power consumption is main cost factor in mining, alternate energy sources like, solar / wind powered rigs could also be possible. Thanks.</p>
 153: <p>One attempt, .... Diablo Mining Company didn't go so well.</p>

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<p>So far, the most profitable mining has been in nations whose taxpayers provide subsidized electricity.  Essentially, it is like a form of welfare for Bitcoin mining entrepreneurs.</p>

<p>ASICs have removed that advantage though so it never got to be that big of a deal.</p>
