# Sioux

MISO asset profile · https://askthegrid.com/assets/facilities/sioux

## Current generation inventory

EIA plant 2107 · Inventory reporting month: 2026-08.

- coal: 1099.4 MW operating nameplate
- Capacity basis: operating_generator_nameplate_mw
- Source inventory: [EIA-860M workbook (preliminary)](https://www.eia.gov/electricity/data/eia860m/xls/august_generator2026.xlsx)
- Inventory retrieved: 2026-10-10T02:12:40.665346+00:00
- Filed coordinate (longitude, latitude): -90.29025, 38.915479
- OSM extract: 2026-10-08T20:21:06Z
- OSM mapped edit: 2026-08-05 16:52:47+00:00
- Map prepared: 2026-10-10T02:28:17.916843+00:00

Battery power (MW) and stored energy (MWh) are separate measures. Shared physical-site membership does not establish electrical connectivity, settlement or a common export limit.

## Reviewed overview

Sioux Energy Center is a coal-fired plant on the Mississippi River at West Alton in St. Charles County, Missouri, owned and operated by Ameren Missouri. Its two cyclone-boiler units began operating in 1967 and 1968, and news coverage puts its output near 1,099 MW. In July 2026 Ameren Missouri asked regulators to approve a 2,100 MW natural gas combined-cycle plant on the site, expected by the end of 2031, as the coal units are anticipated to close between 2032 and 2035.

## Reviewed metrics

- **Nameplate capacity:** 1099.4 MW — Canonical EIA plant baseline.
- **Registry anchor:** Plant 2107 — plant-2107

## Facts

- **Technology:** Conventional Steam Coal
- **Operator:** Ameren Missouri

## Related parties

- **Owner / operator:** Ameren Missouri — owner ([source](https://www.ameren.com/missouri))

## Sources

- [psc.mo.gov](https://psc.mo.gov/Electric/PSC_Sets_Intervention_Deadline_in_Ameren_Missouri_CCN_Request_-_pr-27-09) — psc.mo.gov · authoritative — Source retained for exact-record publication review.

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Canonical page: https://askthegrid.com/assets/facilities/sioux
Website: [Ameren Missouri](https://www.ameren.com/missouri)

Source: Ask the Grid — https://askthegrid.com/