California Code, Public Utilities Code - PUC § 987

(a) The commission shall maintain a list of core gas customers who do not wish to be solicited by telephone, by a gas corporation, marketer, broker, or aggregator for gas service, to subscribe to or change their core transport agent. The commission shall not assess a charge for inclusion of a customer on the list. The list shall be updated periodically, but no less than quarterly.

(b) The list shall include sufficient information for gas corporations, marketers, brokers, or aggregators of gas service to identify customers who do not wish to be solicited, including a customer's address and telephone number. The list shall be made accessible electronically from the commission to any party regulated as a gas corporation or registered with the commission as an electric marketer, broker, or aggregator of gas service.

(c) A gas corporation, marketer, broker, or aggregator of gas service shall not solicit, by telephone, any customer on the list prepared pursuant to subdivision (a). Any gas corporation, marketer, broker, or aggregator of gas service, or the representative of a gas corporation, marketer, broker, or aggregator of gas service, who solicits any customer on the list prepared pursuant to subdivision (a) more than once shall be liable to the customer for twenty-five dollars ($25) for each contact in violation of this subdivision.