EDIT: OK, I just found this link. Might be able to answer this question myself, but thought I'd post this for other people. I'll post my findings later if I get a chance. http://michaelbluejay.com/electricity/cost.html (original question: I'm wondering if anyone knows how to figure out how much it costs to run a 250 watt bulb for a brooder continuously. For instance, in one month's time, how would it affect my energy bill? Not sure what a kilowatt hour actually is, either. All I know is a broody hen is pretty efficient. ) Thanks!