Yes, you can zero out your utility bill but will still receive a bill from SDG&E each month. At the end of 12 months your utility bill will be trued up (reconciled). SDG&E evaluates the amount of power that you produced versus the amount of power that you used and you will make a payment if your solar system produce less power than you used or receive a refund if your solar system produced more power than you used. This is all part of a Net Metering Agreement (NEM) with the utility company. This agreement is executed between you and SDG&E prior to activation of your new PV solar power system.