Pub. Util. Code, § 451.8

(a) Following the approval of each general rate case, the commission shall review which costs, if any, differed from the general rate case forecasts for each electrical corporation or gas corporation. The commission shall adjust the authorized revenue requirement in the subsequent general rate case, as appropriate, based on the actual past costs the corporation records.

(b) (1) The commission shall establish guidelines for electrical corporations and gas corporations to calculate and report their actual rates of return to the commission.

(2) The commission shall require electrical corporations and gas corporations to report their actual rates of return to the commission annually.

(3) The commission shall adopt processes to adequately track an electrical corporation’s or gas corporation’s actual rate of return relative to its forecasted rate of return and shall require the corporation to identify the cost categories where projected costs differed from actual costs.

(c) This section does not restrict, limit, or otherwise affect the commission’s obligation to ensure that rates are sufficient to enable an electrical corporation or gas corporation to recover a just and reasonable amount of revenue, pursuant to Section 451, including a reasonable return.