I've never heated my house with anything but coal....i bought the house dec 2012 (middle of our summer down here) that first winter i heated with the open fireplace and the coalrange(cookstove)....i was averaged about about a ton a month for the winter....$102 ton pick up at the mine.
i built my stoker stove in time for this winter thats just finishing....i have used 2 1/4 ton of coal so far from the same mine and the house is alot warmer than last year...cheaper coal too due to being a smaller size that not many people want,...$86 ton pick up
With the coalrange heating DHW as well....my power bill dropped from $180+ to $80 as soon as i turned off the hot water cylinder.
the only other heating that the house has is a heatpump split system....at $0.31 per kw/h i don't even want to know what that would cost to run now
i have a couple of power bills from the previous owners.....july 2011 (mid winter) cost them $416.57
.....and power prices have jumped about 35% since then after the damn government sold ALL the power co's to foriegn owners(mainly US and Chinese investment funds
...but thats a rant for another forum)...for less than the cost to build the infarstructure
I figure that coal has saved me about $1400 this winter on heating alone after buying the coal....plus coal heated DHW saves me about $80 a month once i cover the cost of the coal for the whole year