Pub. Util. Code, § 818

No public utility may issue stocks and stock certificates, or other evidence of interest or ownership, or bonds, notes, or other evidences of indebtedness payable at periods of more than 12 months after the date thereof unless, in addition to the other requirements of law it shall first have secured from the commission an order authorizing the issue, stating the amount thereof and the purposes to which the issue or the proceeds thereof are to be applied, and that, in the opinion of the commission, the money, property, or labor to be procured or paid for by the issue is reasonably required for the purposes specified in the order, and that, except as otherwise permitted in the order in the case of bonds, notes, or other evidences of indebtedness, such purposes are not, in whole or in part, reasonably chargeable to operating expenses or to income.