In response to richg, Shane, and our friend MO ............. richg is correct in stating there is competition (more or less, dependent on location) for materials suitable for manufacturing pellets for present day and past stove technology. Shane is correct in stating that evolution of stove technology in the future will enable pellet producers to utilize a wider range of raw materials.
Since the beginning, pellet stove manufacturers have been the ones who have specified the criteria to which a pellet should be made; i.e.: moisture content, fines content, bulk density, ash content, salt content, diameter, length. After all, it is their appliances that will utilize the fuel. As it stands, clean hardwood and/or softwood fiber is about the only thing available in large quantities that will allow a pellet manufacturer to manufacture to the spec. Believe me, if it were left up to us pellet mfgs to develop the spec, we'd be using everything and anything, including what the dog leaves in the backyard (except on my shift). Of course, some of you are probably thinking that, based on quality, there are certain brands of pellets that contain everything and anything, but we'll leave that for another day. Back to wood fiber............ there has always been competition: particleboard, MDF, waferboard, paperpulp, hog fuel boilers, nurseries, animal bedding, smokers (the meat kind), etc., and the ever-growing-in-demand composite plastic/wood decking. It is this competition that is the dilemma of every pellet producer out there; especially those looking at increasing production, which unfortunately cannot happen overnight. The price and availability of the wood is directly relative to the current market conditions of the competition and, of course, the market conditions of lumber from which the residuals are generated. It's tough to plan the construction of a pellet mfg plant (permitting process alone can take six months) not knowing what volume of wood will be available, and at what price, the day you are ready to turn the key. To address MO's post.......if, fundamentally, another product (i.e.: corn) can be used by itself or in conjunction with pellets, it should be considered. First, one needs to determine the financial feasibility ($ vs. btu). Secondly, if the product burns in the stove and causes no damage to the stove, stove owner, or home, it would be solely at the discretion of the user to determine if any added maintenance (higher ash/clinkering) is worth the benefit.
For those wondering where Darryl is.........knowing him to be one smart cookie, he's probably out setting up Christmas tree reclamation centers. Who knows, it could be the newest thing..........tinsel adorned pellets!