Cal. Pub. Util. Code § 738

For the purpose of Sections 734 to 737, inclusive, the cause of action shall accrue upon the delivery or tender of delivery of the shipment or the performance of the service or the furnishing of the commodity or product with respect to which complaint is filed or claim made. The remedies in those sections shall be cumulative and in addition to any other remedy or remedies in this part provided in case of failure of a public utility to obey an order or decision of the commission.