Biofuels Digest in an article dated March 10, 2008 "Switchgrass fuel costs as low as 44 cents per gallon" reports on the results of a five-year, 10-farm study in Nebraska on switchgrass production.
REAP-Canada (Resource Efficient Agricultural Production) provides an on-line library with many publications and presentations devoted to utilizing Switchgrass for bioheat. One of the presentations is this one on Switchgrass for Bioheat in Canada.