California Code, Public Utilities Code - PUC § 1766

(a) Under no circumstance shall the Supreme Court or court of appeal stay or suspend any order or decision by the commission authorizing an increase or decrease in rates or changing any rate classification.

(b) If a commission order or decision authorizing any increase or decrease in rates, or changing any rate classification, is set aside by the Supreme Court or court of appeal, the matter shall be referred back to the commission for further action consistent with the order of the court.  The commission, in taking this further action, shall not authorize refunds, and any relief ordered by the commission that shall have the effect of increasing or decreasing rates shall be prospective only.