California Code, Public Utilities Code - PUC § 218.3

(a) “Electric service provider” means an entity that offers electrical service to customers within the service territory of an electrical corporation and includes the unregulated affiliates and subsidiaries of an electrical corporation.

(b) “Electric service provider” does not include an entity that offers electrical service solely to service customer load consistent with subdivision (b) of Section 218, and does not include an electrical corporation or a public agency that offers electrical service to residential and small commercial customers within its jurisdiction, or within the service territory of a local publicly owned electric utility.

(c) “Electric service provider” does not include an independent solar energy producer, as defined in Article 3 (commencing with Section 2868) of Chapter 9 of Part 2.