Checked these out today
http://www.cfcl.com.au/Assets/Files/Gennex_Brochure_(EN)_Apr-2010.pdf
$33,000 plus installation, no government subsidy, nothing for excess electricity being fed into grid and no batteries for storing electricity, but they are working on it. Strange situation they told me they are not keen on selling them in Australia, more for export market, yet they import them from Germany, they told me they were the only company in Australia who were selling them and they only run on natural gas.
The TV show I saw had theirs running on natural gas or LPG and an 8.5 Kg bottle would provide an average household with enough electricity for 2 weeks.
Also asked my brother about hacking in to the smart meters and yes you can.