- Combustion
- Wind & solar
- Loads
- In development
- Under construction
- Operating
- Size not stated
- 10 · 100 · 1,000 MW
Map
- Combustion
- Wind & solar
- Loads
- In development
- Under construction
- Operating
- Size not stated
Sioux: location and 5 exact-grade projects within 25 km. Basemap: Protomaps, © OpenStreetMap contributors, ODbL.
Sioux
Power plant · Coal
Key facts
Power plant · Coalran 41% of 2025 Retiring- Capacity
- Capacity: sourceEIA-860M · Open licenseMW
- Commissioned
- 1967
- Net generation, 2025
- 3,986,364 MWh
- Grid
- 138 kV to Union Electric Co - (MO) (MISO)
- Location
- St Charles County, Missouri
- Operated by
- Union Electric Co - (MO)
Output
- Coal
- Oil
- Biomass and waste
Details
Who’s behind it
- Owner
- Ameren Corp
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- Technology
- Coal source: “Conventional Steam Coal”
- Age
- 59 years since 1967
- Heat rate
- 10,176 Btu/kWh 2025
All 7 attributes from EIA-860M Preliminary Monthly Electric Generator Inventory
| Attribute | Value |
|---|---|
| Gem |
|
| EPA greenhouse gas reporting (GHGRP) |
|
| Fuel burned (MMBtu), 2025 | 40,567,081 |
| Capacity factor, 2025 | 0.414 |
| Heat rate (Btu/kWh), 2025 | 10,176.5 |
| Net generation (MWh), 2025 | 3,986,364.0 |
| Balancing authority code | MISO |
Retirement
EIA-860M September 2026StatusAt least half of the plant's in-service nameplate capacity is scheduled to retire, on dates its owner has reported to EIA. As of EIA-860M for September 2026.- Next scheduled retirement
- December 2028
- Capacity scheduled to retire
- 1,099.4 MW
- Generators scheduled to retire
- 2
- Share of in-service capacity scheduled
- 100%
- Capacity still in service
- 1,099.4 MW
| Generator | Technology | Nameplate | State | Date |
|---|---|---|---|---|
| 1 | Conventional Steam Coal | 549.7 MW | Scheduled to retire | December 2028 |
| 2 | Conventional Steam Coal | 549.7 MW | Scheduled to retire | December 2028 |
Grid
EIA-860 2025Grid fieldsAs the plant reported them to EIA-860 for 2025 (Schedule 2).- Grid voltage at the plant
- 138 kV
- Transmission or distribution system owner
- Union Electric Co - (MO)
- Balancing authority
- Midcontinent Independent Transmission System Operator, Inc..
- NERC region
- SERC
Transmission lines within 25 km (10)
Can the connection be reused?
A plant that retires usually leaves its substation, transmission connection and interconnection agreement behind, and those may be reusable by a new project at the same site. FERC Order No. 845 lets an interconnection customer use surplus interconnection service at an existing site, and some transmission providers' tariffs let a replacement resource take over a retiring unit's interconnection service, usually within a set time after the retirement. Whether any such right still exists here, who holds it and on what terms depends on the owner, the transmission provider and timing; this page does not establish any of that.
Ownership
2 companies2| Company | Role | Share | As of | Source |
|---|---|---|---|---|
| Union Electric Co - (MO) | Operator | EIA-860M | ||
| AMEREN CORP | Owner | 100.0% | 31 Dec 2023 | EPA GHGRP |
Timeline
- Stated Units 1, 2 scheduled to retire, 1,099.4 MW · EIA-860M
- In service · EIA-860M
Sources
6 sourcesSources EIA-860M · GEM · LBNL · EIA · EIA-860M Preliminary Monthly Electric Generator Inventory · EPA Greenhouse Gas Reporting Program — facility register with parent-company shares (Envirofacts pub_dim_facility; FLIGHT)
Sources
- EIA-860M Preliminary Monthly Electric Generator Inventory
- Global Energy Monitor — Global Integrated Power Tracker (unit-level power plants, eight technologies, all statuses)Global Integrated Power Tracker, Global Energy Monitor, September 2026 release (https://globalenergymonitor.org/projects/global-integrated-power-tracker), CC BY 4.0. Modified by Inframation: TransitionZero-sourced rows removed; statuses and technologies mapped to Inframation's vocabulary; figures aggregated. Copyright © Global Energy Monitor. Global Integrated Power Tracker, September 2026 release. Distributed under a Creative Commons Attribution 4.0 International License.
- LBNL — A Harmonized Geospatial Dataset of U.S. Transmission Lines: Linking FERC Form 1 and HIFLD, 1994-2024 (OEDI submission 8742)Yin, Nait Belaid & Heleno (2026), Lawrence Berkeley National Laboratory, OEDI, CC BY 4.0: A Harmonized Geospatial Dataset of U.S. Transmission Lines: Linking FERC Form 1 and HIFLD, 1994-2024. Modified by Inframation: HIFLD-side fields only, names re-cased, coordinates rounded.
- EIA Open Data bulk file — Electricity (ELEC.zip; monthly plant net generation and fuel consumption since 2001)Source: U.S. Energy Information Administration, Electricity bulk data (Form EIA-923 monthly plant series)
- EIA-860M Preliminary Monthly Electric Generator Inventory
- EPA Greenhouse Gas Reporting Program — facility register with parent-company shares (Envirofacts pub_dim_facility; FLIGHT)
Around this plant
Nearby
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|---|---|---|---|
| THOMPSON REUTERS DATA CEN Built | Large load | 17.7 km | |
| OPPIDAN DATA CENTER Under construction | Large load | 20.9 km | |
| Hibiscus Solar, LLC Under construction | Solar | 21.3 km | 5 |
| SV CSG Roxana 1 Under construction | Solar | 23.6 km | 2.5 |
| SV CSG South Roxana Filed | Solar | 23.7 km | 5 |