Mo. Rev. Stat. § 393.292
Notwithstanding any other provision of law to the contrary, the public service commission shall have the power, pursuant to regulations, to review and authorize changes to the rates and charges contained in the schedules of an electric corporation as a result of a change in the level or annual accrual of funding necessary for its nuclear power plant decommissioning trust fund only after a full hearing and after considering all facts relevant to such funding level or accrual rate. The commission shall also have the authority to adopt regulations to govern the procedure for submission, examination, hearing and approval of such tariff changes and to ensure that the amounts collected from ratepayers and paid into such trust funds will be neither greater nor lesser than the amounts necessary to carry out the purposes of the trusts.
§ 393.292, RSMo