From Consumer Reports:
Fuel

According to the United States Department of Energy, the average cost of a cord of firewood or a ton of wood pellets is $190. But for a true comparison of the costs, you have to look at not just the price of the fuel but also the heating value of the fuel, also measured in BTU, and the efficiency of the heating appliance. Using averages for all three, the Energy Information Administration's Heating Fuel Comparison Calculator estimates it costs $15.15 to produce 1 million Btu using pellets and $9.09 using solid wood. Those figures are between the costs of coal ($9.06) and natural gas ($12.61) and are well below the costs of oil ($18.53), propane ($24.66), and electric furnaces, baseboards, and space heaters ($33.25).

Looks like my natural gas may be my best bet for now.
Last year we actually lost NG feed for 3 days during a deep freeze and it wuz COLD!
Sure would be nice to have a backup heating plan. Looking into this.
Thanks.