Many energy equivalence charts fail to take the efficiency of the stove, furnace, or boiler into consideration when attempting to equate one energy source to another. I've worked to include burning efficiency in the mix. They also assume laboratory dry coal. By my calculation:

One ton of anthracite with 6% moisture content when burned at 80% efficiency is roughly the heating equivalent of the following:

1) 5,777 KWH of electricity at 100% efficiency.

2) 164 gallons of #2 heating oil at 87% efficiency.

3) 229 gallons of propane at 94% efficiency.

4) 210 therms of natural gas at 94% efficiency.