Generally, water and gas are included in your rent, but electric is not. Electric is very expensive, and could cost several hundred dollars a month (my highest bill was $250 for 1 month - much less than my home in Texas) so you should use your air conditioning sparingly to avoid big bills. Electric is billed every 2 months, with the paper statement delivered to your front gate or door, and must be paid within 5 days of receipt. You can go to the electric company and ask for a "corte" or meter reading when you take possession of your home, and when you depart, to help establish the amount you owe for electric usage, which will be deducted from your deposit.