When you go solar you’ll enter into a net energy metering agreement with the local utility company. What’s going to happen is rather than being billed once a month like you are now, you’re going to be put on a yearly billing cycle.
From month to month within that billing cycle, you will get a statement but no money is due. You only have to pay at the end of the year which is called your true-up. When you get your true-up bill if you’ve produced more solar than you need and you have no fixed charges, then you would owe no money. However, if you have not produced enough solar power and there are fixed charges as part of your true bill you would have to make that payment to the utility.