I'm very interested in this as well!! Seems like a very good idea on the surface. Some quick googling results. Seems more like a very high level research project with the gov't. That last link explains the Enmax / MicroGen partnership + application. Says they're not powerful enough for the Canadian winters...
http://www.nist.gov/el/upload/6-2-Ri...-in-Canada.pdf
http://www.ccht-cctr.gc.ca/eng/proje..._stirling.html
http://www.cjconnect.ca/index.php?op...tner&Itemid=11