7 Cal. 3d 331 (1972), 497 P.2d 785

The Court reversed a Commission order authorizing a rate increase for Pacific Telephone & Telegraph Co.  The court held that the rate increases were based in part on accounting practices embracing depreciation methodologies of which the Court had previously disapproved.  The Court, relying on Section 728, also concluded that sums collected pursuant to the order must be refunded.