What's the rule of thumb... you get 1000w/bedroom total?

If you want to use all your electricity on growing, make sure you are WICKED tightass about everything else.

Replace all other lights with cfls. Turn them off unless you are using them.
If you have an electric hot water heater, take showers elsewhere.
If you have a washer/dryer, use the laundromat instead.
Don't use the heated dry on your dishwasher.
Don't use anything with a heating element- blow dryer, coffee pot , toaster, bathroom warmer, electric cooktop, etc. LEarn to love microwave ramen noodles.
It's just common sense. But I wouldn't grow in an apartment complex anyway, or with a roommate. Even if you are great buds, being on a lease together has ruined more than one friendship!!