For an excellent, brutally honest discussion of the long hard 
expensive path to market for the Whispergen Stirling combined heat & 
power unit see

        http://www.unlimited.co.nz/unlimited.nsf/default/A59ACC6CAB5E4050CC256F50007B1760
&
        http://www.unlimited.co.nz/unlimited.nsf/UNID/720112B6E0104AD3CC256F560010EF4C

They have a $300 million order for 80,000 over 5 years from Powergen 
in the UK (is that real enough?) BUT that could yet not happen. 
Investment so far is apparently about $NZ 20 million, so it's not an 
easy path.

The UK dometic market prices gas energy at 25% of equivalent 
electricity so it's much easier to cost justify a domestic heat and 
power generator than in say NZ. With excess power being delivered to 
the grid consumers can effectively "store" power made for subsequent 
use.



        RM


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