ITS IMPOSSIBLE TO TELL ( OR ESTIMATE A SPARK BILL)
BUT if you are worried about enrgy consumption remember the following few things can be done to help lower the usage
1) change all light bulbs in your house to low wattage energy saving light bulbs ( they will cost a few bucks but in the long run you will make the money back from the energy u aint using)
2) close windows at night or day when its cold to keep the heat in ( or cold out) to save on heating costs
3) turn all lights off when possible ( even if your only going out the room for a crap , or to get something, switch them off) those extra watts u using when u dotn need to still cost ya
4) take all appliances of standby when you aint using them( stereos ,dvd players, tvs, ps3's, even microwaves ( dont worry you dont need the clock on it set ) thats what a battery powered wall clock is for)
5) never boil a full kettle of water for cofee or tea , ( it uses up masses of electricity, boil one or two cups depending on what you make) dont be lazy you can fill it up again after if u want another !
these are just a few of endless tips on electricty saving,
i can give more, but that will be useless , ( unless everyone in the world read them and used them)