well, electricity is 7.45cents a KwH. BTW, using Kw/Hr is incorrect, if you ever do this you will mess up your calculations. If you want to work with KwH, the equivelent is Joules. Just multiply the amount of KwH's by 3600 for joules. Wish they could use Megajoules on your electric bill (I.E. 3.6MJ = 1KwH).