{
  "id": "mo-sb4-2025",
  "jurisdiction": "MO",
  "kind": "statute",
  "status": "enacted",
  "title": "SS#2 SB 4 (103rd General Assembly, 2025) - relating to utilities",
  "citation": "SS#2 SB 4, 103rd Gen. Assembly, 1st Reg. Sess. (Mo. 2025); LR No. 0120S.08T; amending/enacting Mo. Rev. Stat. secs. 393.130, 393.135, 393.1900 et al.",
  "docket_no": null,
  "agency": null,
  "utility": null,
  "verification": "verified",
  "updated_at": "2026-08-16T21:33:43.83309+00:00",
  "record_url": "https://verifiedatlas.com/i/mo-sb4-2025/",
  "snapshot_built_at": "2026-09-14T14:33:17+00:00",
  "sources": [
    {
      "url": "https://www.senate.mo.gov/25info/pdf-bill/tat/SB4.pdf",
      "pinpoint": "p.40, Sec. 393.130, subsection 7",
      "quote": "Each electrical corporation providing electric service to more than two hundred fifty thousand customers shall develop and submit to the commission schedules to include in the electrical corporation's service tariff applicable to customers who are reasonably projected to have above an annual peak demand of one hundred megawatts or more. The schedules should reasonably ensure such customers' rates will reflect the customers' representative share of the costs incurred to serve the customers and prevent other customer classes' rates from reflecting any unjust or unreasonable costs arising from service to such customers.",
      "quote_chars": 624,
      "title": "SENATE SUBSTITUTE NO. 2 FOR SENATE BILL NO. 4, 103RD GENERAL ASSEMBLY, 2025 [TRULY AGREED TO AND FINALLY PASSED]",
      "source_type": "statute",
      "verification": "verified"
    },
    {
      "url": "https://www.senate.mo.gov/25info/pdf-bill/tat/SB4.pdf",
      "pinpoint": "p.41-42, Sec. 393.135, subsections 1-2(1)",
      "quote": "any charge made or demanded by an electrical corporation for service, or in connection therewith, which is based on the costs of construction in progress upon any existing or new facility of the electrical corporation, or any other cost associated with owning, operating, maintaining, or financing any property before it is fully operational and used for service, is unjust and unreasonable, and is prohibited. 2. (1) An electrical corporation may be permitted, subject to the limitations in this subsection, to include construction work in progress for any new natural gas-generating unit in rate base.",
      "quote_chars": 603,
      "title": "SENATE SUBSTITUTE NO. 2 FOR SENATE BILL NO. 4, 103RD GENERAL ASSEMBLY, 2025 [TRULY AGREED TO AND FINALLY PASSED]",
      "source_type": "statute",
      "verification": "verified"
    },
    {
      "url": "https://www.senate.mo.gov/25info/pdf-bill/tat/SB4.pdf",
      "pinpoint": "p.70, Sec. 393.1400, subsection 1(3)",
      "quote": "\"Qualifying electric plant\", all rate-base additions, except rate-base additions for new coal-fired generating units, new nuclear generating units, [new natural gas units,] or rate-base additions that increase revenues by allowing service to new customer premises",
      "quote_chars": 263,
      "title": "SENATE SUBSTITUTE NO. 2 FOR SENATE BILL NO. 4, 103RD GENERAL ASSEMBLY, 2025 [TRULY AGREED TO AND FINALLY PASSED]",
      "source_type": "statute",
      "verification": "verified"
    },
    {
      "url": "https://www.senate.mo.gov/25info/pdf-bill/tat/SB4.pdf",
      "pinpoint": "p.131-132, Sec. 393.1900 (new), subsection 5(3)",
      "quote": "Notwithstanding section 393.135 to the contrary, if approved in a proceeding granting permission and approval under subsection 1 of section 393.170, an electrical corporation may be permitted to include in the corporation's rate base any amounts recorded to construction work in progress for the investments for which permission is given under subdivision (1) of subsection 5 of this section.",
      "quote_chars": 392,
      "title": "SENATE SUBSTITUTE NO. 2 FOR SENATE BILL NO. 4, 103RD GENERAL ASSEMBLY, 2025 [TRULY AGREED TO AND FINALLY PASSED]",
      "source_type": "statute",
      "verification": "verified"
    },
    {
      "url": "https://www.senate.mo.gov/25info/pdf-bill/tat/SB4.pdf",
      "pinpoint": "p.40, Sec. 393.130, subsection 7 (sentence immediately following the 100 MW sentence)",
      "quote": "Each electrical corporation providing electric service to two hundred fifty thousand or fewer customers as of January 1, 2025, shall develop and submit to the commission such schedules applicable to customers who are reasonably projected to have above an annual peak demand of fifty megawatts or more. The commission may order electrical corporations to submit similar tariffs to reasonably ensure that the rates of customers who are reasonably projected to have annual peak demands below the above-referenced levels will reflect the customers' representative share of the costs incurred to serve the customers",
      "quote_chars": 610,
      "title": "SENATE SUBSTITUTE NO. 2 FOR SENATE BILL NO. 4, 103RD GENERAL ASSEMBLY, 2025 [TRULY AGREED TO AND FINALLY PASSED]",
      "source_type": "statute",
      "verification": "verified"
    },
    {
      "url": "https://www.senate.mo.gov/BillTracking/Bills/BillInformation?year=2025&billid=66",
      "pinpoint": "Bill Details table / Current Bill Summary",
      "quote": "SB 4 - Cierpiot, Mike Modifies and creates new provisions relating to utilities ... Sponsor Cierpiot, Mike LR Number 0120S.08T Title SS#2 SB 4 House Handler Hurlbert, Josh Journal Page S788 Effective Date August 28, 2025 ... Current Status Signed by Governor",
      "quote_chars": 258,
      "title": "SB 4 - Bill Information | Missouri Senate",
      "source_type": "government",
      "verification": "verified"
    },
    {
      "url": "https://www.senate.mo.gov/BillTracking/Bills/BillInformation?year=2025&billid=66",
      "pinpoint": "Current Bill Summary, \"AN ELECTRICAL CORPORATION'S SERVICE TARIFF (Section 393.130)\"",
      "quote": "Under the act, an electrical corporation with more than 250,000 customers shall develop and submit to the Public Service Commission schedules to include its service tariff applicable to customers who are projected to have above an annual peak demand of 100 megawatts or more. The schedules should ensure such customers' rates will reflect a representative share of the costs incurred to serve the customers and prevent other customer classes' rates from reflecting any unjust or unreasonable costs arising from service to such customers.",
      "quote_chars": 537,
      "title": "SB 4 - Bill Information | Missouri Senate - Current Bill Summary",
      "source_type": "government",
      "verification": "verified"
    },
    {
      "url": "https://www.senate.mo.gov/BillTracking/Bills/BillInformation?year=2025&billid=66",
      "pinpoint": "Current Bill Summary, \"AMOUNTS INCLUDED IN CONSTRUCTION WORK IN PROGRESS (Section 393.135)\"",
      "quote": "The act provides that, subject to certain limitations, an electrical corporation may be permitted to include construction work in progress for any new natural gas-generating unit in rate base. ... These provisions shall expire on December 31, 2035, unless the Commission determines, after a hearing as described in the act, that good cause exists to extend these provisions through December 31, 2045.",
      "quote_chars": 400,
      "title": "SB 4 - Bill Information | Missouri Senate - Current Bill Summary",
      "source_type": "government",
      "verification": "verified"
    },
    {
      "url": "https://moconsumers.org/utilities/data-centers-our-concerns/",
      "pinpoint": "'Laying the Groundwork for a New Nuclear Power Plant' section",
      "quote": "Consumers Council estimates that constructing a nuclear plant in Missouri under the provisions of SB 4 could increase the average household’s electric utility costs by approximately $500 more per year. That’s how much it could cost each of us during the 10-15 year construction period, before a power plant provides us with any electricity.",
      "quote_chars": 340,
      "title": "Data Centers - Our Concerns",
      "source_type": "advocacy",
      "verification": "verified"
    }
  ],
  "threshold_mw": 100,
  "mandatory": true,
  "summary": "SB4 (2025) amends Mo. Rev. Stat. sec. 393.130 to require large electrical corporations to submit PSC tariff schedules for large-load customers (100 MW threshold for utilities over 250,000 customers, 50 MW for smaller ones) designed to allocate cost responsibility to those customers and shield other customer classes. It also amends sec. 393.135 to permit construction-work-in-progress (CWIP) cost recovery in rate base for new natural gas-generating units only (subject to limits and refund provisions), while a separate new integrated-resource-planning section (393.1900) allows CWIP recovery for commission-approved resource additions without an explicit fuel-type limitation in the language reviewed, and sec. 393.1400 separately excludes new nuclear and new coal generating units from the definition of 'qualifying electric plant' used in that section's rate-base mechanism. The act took effect August 28, 2025.",
  "exit_terms": "Not specified in the statute text itself (exit/termination terms appear in PSC-approved utility tariffs implementing the statute, not in SB4's own text).",
  "collateral_terms": "Not specified in the statute text itself (collateral terms appear in PSC-approved utility tariffs implementing the statute, not in SB4's own text).",
  "curtailment_terms": "Not specified in the statute text itself.",
  "cost_allocation": "Sec. 393.130.7 directs electrical corporations serving more than 250,000 customers to submit tariff schedules for customers projected to exceed 100 MW annual peak demand (50 MW for corporations serving 250,000 or fewer customers as of Jan. 1, 2025; the commission MAY also order tariffs for customers below those levels) that 'reasonably ensure such customers' rates will reflect the customers' representative share of the costs incurred to serve the customers and prevent other customer classes' rates from reflecting any unjust or unreasonable costs arising from service to such customers.'"
}