Section 757.398 - Small natural gas utilities; filing to participate; rate cap; cost recovery; qualified investments(1) Upon a filing by a small natural gas utility to participate in the small renewable natural gas program adopted by rule by the Public Utility Commission under ORS 757.394(2), the commission shall establish a rate cap limiting the small natural gas utility's costs of procuring renewable natural gas from third parties and qualified investments in renewable natural gas infrastructure. The rate cap must be expressed as a percentage of the small natural gas utility's total revenue requirement as approved by the commission in the public utility's most recent general rate case. For the purposes of establishing a rate cap under this subsection, the commission shall account for: (a) Any value received by the small natural gas utility upon any resale of renewable natural gas, including any environmental credits that the renewable natural gas producer chooses to include with the sale of renewable natural gas to the small natural gas utility; and(b) Any savings achieved through avoidance of conventional gas purchases or development, such as avoided pipeline costs or carbon costs.(2)(a) A filing by a small natural gas utility under subsection (1) of this section must include, but need not be limited to:(A) A proposal to procure a total volume of renewable natural gas over a specific period; and(B) Identification of the qualified investments that the small natural gas utility may make in renewable natural gas infrastructure.(b) A small natural gas utility may from time to time revise the filing submitted to the commission under this section.(3) Any prudently incurred costs incurred by a small natural gas utility pursuant to a filing submitted under this section may be recovered by means of an automatic adjustment clause, as defined in ORS 757.210.(4) When a small natural gas utility makes a qualified investment in the production of renewable natural gas, the costs associated with that qualified investment shall include the cost of capital established by the commission in the small natural gas utility's most recent general rate case.