FutureMetrics, LLC, December 2013, by William Strauss.
http://futuremetrics.info/wp-content/uploads/2013/12/How-the-Northern-States -can-Heat-with-Renewable-Energy-and-Create-

A white paper from a consulting firm for the pellet fuel industry -
"As this white paper will show, the negative economic and environmental impacts of this [petroleum-based fossil fuels] dependency are significant. But this paper will also show that the positive benefits that accrue from the conversion of homes and businesses from fossil fueled heating systems to renewable premium pellet fueled systems are significant. "