Cal. Pub. Util. Code § 1764
In case the order or decision of the commission is stayed or a temporary stay granted, the order of the Supreme Court or court of appeal shall not become effective until a suspending bond is executed and filed with and approved by the court, payable to the people of the State of California and sufficient in amount and security to insure the prompt payment by the party petitioning for the review, of all damages caused by the delay in the enforcement of the order or decision of the commission and of all money which any person or corporation may be compelled to pay pending the review of the proceedings for transportation, transmission, product, commodity, or service in excess of the charges fixed by the order or decision of the commission, in case the order or decision is sustained.
Ca. Pub. Util. Code § 1764