Mo. Rev. Stat. § 393.1705
1. For purposes of this section, the term "replacement resources" shall mean:
(2) Generation facilities which produce electric energy from natural gas that enable the electrical corporation to:
(3) Energy storage facilities that enable the electrical corporation to:
2. If requested by an electrical corporation in a petition filed concurrently with a petition filed under subsection 2 of section 393.1700 to recover securitized utility tariff costs and notwithstanding any other provision of chapter 386 or this chapter to the contrary, including section 393.170 which section shall not apply to the construction of replacement resources as defined in subsection 1 of this section:
(2) The commission shall create a deferral mechanism by which the electrical corporation shall defer, to a regulatory asset or regulatory liability as appropriate, the changes in the electrical corporation's revenue requirement used to last set its base rates as specified in this subdivision. Such changes shall be deferred during the period starting on the date of retirement or abandonment of the subject unit and ending when the base rates of the electrical corporation that is the subject of the petition are changed as the result of a general rate proceeding where the rate base cutoff date in that general rate proceeding occurs on or after the retirement or abandonment. For purposes of this subdivision, the changes in the electrical corporation's revenue requirement that shall be deferred shall only consist of:
(h) The return on the replacement resources once they are recorded to plant-in-service on the electrical corporation's books at the electrical corporation's weighted average cost of capital, plus applicable federal, state, and local income or excise taxes, used to establish the electrical corporation's revenue requirement last used to set its base rates.
The base against which changes under paragraphs (a), (b), and (c) of this subdivision shall be the values of each such item used to set the electrical corporation's base electric rates in its last general rate proceeding concluded prior to the time the deferrals are made, provided, if the docketed record in such general rate proceeding does not specify one or more necessary revenue requirement parameters to establish the base for paragraphs (a) to (c) of this subdivision because of a black box settlement or otherwise, the commission shall, in the docket created by a petition filed under this section and based on the docketed record in such prior general rate proceeding, establish the missing parameters, which shall then be used to accomplish the deferrals. The base with respect to paragraphs (e), (f), and (g) of this subdivision shall be zero. Notwithstanding the foregoing provisions of this subdivision, deferrals created by this subdivision shall cease on the effective date of rates from a base rate case that shall be filed no later than one year after the subject electric generating unit was retired or abandoned. For purposes of this subdivision, the return in paragraphs (d) and (h) shall equal the weighted average cost of capital used to set the electrical corporation's base electrical rates in its last general rate proceeding concluded prior to the time the deferrals are made, provided, if the docketed record in such general rate proceeding does not specify one or more necessary revenue requirement parameters to establish the base for an item because of a black box settlement or otherwise, the commission shall, in the docket created by a petition filed under this section and based on the docketed record in such general rate proceeding, establish the missing parameters, which shall then be used to accomplish the deferrals;
(3) The commission shall also create a deferral mechanism by which the electrical corporation shall defer to a regulatory asset the changes in the electrical corporation's revenue requirement last used to set its base rates as specified in this subdivision. Such changes shall be deferred during the period beginning on the date deferrals cease under subdivision (2) of this subsection and ending when the electrical corporation's base rates are next changed as a result of a general rate proceeding. For purposes of this subdivision, such changes in the electrical corporation's revenue requirement that shall be deferred shall only consist of:
(d) Increase in nonlabor, nonfuel operations, and maintenance costs of the replacement resources.
Notwithstanding the foregoing provisions of this subdivision, deferrals to the regulatory asset created by this subdivision shall cease at the earlier of the date the electrical corporation's base rates are first changed after the replacement resource is recorded to plant in service on the electrical corporation's books where the rate base cutoff date in that general rate proceeding occurred on or after the retirement or abandonment, or the effective date of rates from a base rate case that shall be filed no later than one year after the unit was retired or abandoned. If there is more than one replacement resource for the retired or abandoned plant and if one or more such replacement resource is placed in service prior to the rate base cutoff date in the general rate proceeding described in subdivision (2) of this subsection, the deferrals called for under this subdivision shall be reduced as needed to reflect that event. The base with respect to paragraphs (b) and (c) of this subdivision shall be zero. For purposes of this subdivision, the return in paragraph (a) shall equal the weighted average cost of capital used to set the electrical corporation's base electric rates in its last general rate proceeding concluded prior to the time the deferrals are made, provided, if the docketed record in such general rate proceeding does not specify one or more necessary revenue requirement parameters to establish the base for an item because of a black box settlement or otherwise, the commission shall, in the docket created by a petition filed under this section and based on the docketed record in such prior general rate proceeding, establish the missing parameters, which shall then be used to accomplish the deferrals;
3. Proceedings on a petition submitted pursuant to this section begin with the filing of a petition by an electrical corporation under this section that is filed concurrently with a petition submitted under section 393.1700, and shall be disposed of in accordance with the requirements of chapter* 386 and this chapter and the rules of the commission, except as follows:
(L. 2021 H.B. 734)
*Word "chapters" appears in original rolls.