Ameren Missouri rate case: July 15, 2026 deadline to intervene as base-rate request seeks about $13/month more for the average bill (if approved)

Law, Local Headlines

The Missouri Public Service Commission (PSC) has set a July 15, 2026 deadline for people and organizations that want to intervene and participate in Ameren Missouri’s electric base-rate request, filed as ER-2026-0291.

Ameren Missouri says its proposal would seek a net increase of about $343 million in annual electric base-rate revenues—an amount the PSC describes as about $13 per month for the average residential customer if approved.

ER-2026-0291 in plain English: “electric base rates”

“Electric base rates” are the core rates Ameren charges for providing electricity (before many bill items that can vary by usage, rider programs, and other factors). In a general rate case, the company proposes changes to those base rates, and the PSC evaluates whether they are just and reasonable.

What Ameren is asking for (and when it says new rates could start)

In the materials tied to the PSC filing, Ameren Missouri lists a $343 million revenue increase request in ER-2026-0291. Ameren also cites a company-requested timeline of a MoPSC decision deadline of May 2027, with new rates effective by June 1, 2027 if approved.

Local public hearings have not been scheduled yet. When hearings are scheduled, PSC says customers will be notified directly by Ameren Missouri and the PSC.

Intervene vs. submit comments: two different ways to be heard

Intervene and participate (active party status): If you want a formal role in the case, the PSC set July 15, 2026 as the deadline for applications to intervene.

Submit comments (public input): Even if you don’t intervene, you may still be able to share feedback while the PSC review is underway. PSC says customers can submit comments by mail, telephone, email, or online via EFIS, and that comments should use the related submission number ER-2026-0291.

What to watch next on the PSC timeline

On the PSC’s EFIS case calendar for ER-2026-0291, the next procedural steps shown include:

  • July 15, 2026: applications to intervene due
  • July 22, 2026: parties submit a joint proposed procedural schedule (and response items are also due)

The PSC press release also notes that the Commission typically has about 11 months from the date the rate case is filed to make a decision on a rate proposal—so a decision is expected on a next-year horizon if the timeline holds.

What local reporting says about potential bill impact

Local public media (KRPS) reported that Ameren Missouri’s request is about a 10% increase, described as roughly $13 a month for the average residential bill, with the new rate taking effect in mid-2027 if approved. Those figures are still proposals—your final bill impact depends on what the PSC orders.

If you’re an Ameren customer in St. Louis: a quick checklist

  • Before July 15, 2026: decide whether you want to intervene and participate (formal role) or only submit comments (public input).
  • As the case proceeds: track updates on the PSC’s EFIS page for ER-2026-0291.
  • When hearings are scheduled: watch for Ameren and PSC notifications about local public hearing dates.
  • Keep in mind: the intervention deadline is not the same thing as submitting comments—so follow the path that matches your level of involvement.

Bottom line

The immediate St. Louis deadline is July 15, 2026 for intervening in ER-2026-0291. Local hearings are not scheduled yet, but PSC review can shape electric base rates that—if approved as requested—could affect bills starting in 2027.

Sources

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