How does YVEA account for energy generation on my bill?

The energy that your system generates is subtracted from the energy that you use and you are billed for the Net kWh. If you produce more energy than you use during a billing period, you will not be billed an energy charge and the excess will be stored in your virtual "bank" for future use. Your banked energy is printed on the monthly bill. If you use more energy than you generate, the difference will be deducted from your banked usage (if available), otherwise, you will be charged the difference.