3.  Serving Under Tariffs

Except for nontariffed or detariffed service, or a deviation (whether by contract or otherwise), authorized by statute or Commission order, a utility shall serve its California customers only at rates and under conditions contained in its tariffs then in effect. Any ambiguity in a tariff provision shall be construed in the way most favorable to the customer, and any representation made by a utility, in advertising or otherwise, with respect to a tariffed service shall be consistent with the terms and conditions of the applicable tariff(s).

If a utility provides optional features in conjunction with a particular service, the utility's tariffs shall identify the optional features as such, and shall describe the means by which a customer elects or rejects such features. If a utility provides alternative means of obtaining a particular service, or its functional equivalent, or a choice between different rate plans, the utility's tariffs shall disclose the alternatives available to a customer, and shall describe how the customer selects an alternative.