It costs about $25 per month per 1000w hps for electricity. It really depends on what history the house you are growing in has for elec use. I had the power company inspect my meter a couple months ago because I was only spending $45 a month and it doubled to $90. Nothing came of it but now adays power use gets flagged if it has varied too much. Just have a story ready. In my case I just told them I wasn't buring firewood for heat and was relying on the electric furnace which increased my bill. I've also known someone who spends $5000 a month in elec bill per month and he's never been asked a thing.lol