12 GCA § 8505: Net Metering Billing Period.

(a) The billing period for net metering may be either a monthly period, or with the written consent of the customer-generator, quarterly, semi-annual or annual period.

(b) The net energy measurement must be calculated in the following manner:

(1) The utility shall measure the net electricity produced or consumed during the billing period, in accordance with normal metering practices.

(2) If the electricity supplied by the utility exceeds the electricity generated by the customer-generator which is fed back to the utility during the billing period, the customer-generator must be billed for the net electricity supplied by the utility.

(3) If the electricity generated by the customer-generator which is fed back to the utility exceeds the electricity supplied by the utility during the billing period, the customer-generator is entitled to compensation for electricity provided to the utility during the billing period at a rate to be determined by the Public Utilities Commission. However, non-residential class customers with a customer-generator that exceeds one hundred (100) kilowatts in generating capacity shall not be entitled to compensation for any electricity provided to the utility under this Section.