Quote Originally Posted by Avengerdriver
360 a month would be a pretty big spike considering my current usage. I live in an apartment so my bill is pretty low. Last month was one of the hottest in 10 years and I only used 900kwh. Average is about 600.
If you only want to grow a couple plants, you can get away with as little as 400 watts, which would be only 144 kWh per month on 12/12. You may have less yield and/or a longer grow before you can harvest, but it's doable.