Taum Sauk
Reynolds County, Missouri · EIA plant ID 2108 · Operator: Union Electric Co - (MO)
Nameplate408MWSummer 440 MW
Generators2in service
Net generation-140GWh12 mo to Aug 2026
Capacity factor—not meaningful for storage
Heat rate—thermal plants only
First online1963
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), primary-fuel units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
No capacity factor available.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | -265.9 | — | — |
| 2002 | -206.1 | — | — |
| 2003 | -254 | — | — |
| 2004 | -215.2 | — | — |
| 2005 | -237.6 | — | — |
| 2006 | -1 | — | — |
| 2010 | 403.4 | — | — |
| 2011 | -131.5 | — | — |
| 2012 | -104.1 | — | — |
| 2013 | -102.6 | — | — |
| 2014 | -135.9 | — | — |
| 2015 | -71.8 | — | — |
| 2016 | -152.9 | — | — |
| 2017 | -147.6 | — | — |
| 2018 | -121.3 | — | — |
| 2019 | -19.6 | — | — |
| 2020 | -93.7 | — | — |
| 2021 | -86.1 | — | — |
| 2022 | -147.9 | — | — |
| 2023 | -130 | — | — |
| 2024 | -133 | — | — |
| 2025 | -159.8 | — | — |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| 1 | Hydroelectric Pumped Storage | PS | 204 | 220 | Dec 1963 | Operating | — | coming soon |
| 2 | Hydroelectric Pumped Storage | PS | 204 | 220 | Dec 1963 | Operating | — | coming soon |
Owner / operator
Operator: Union Electric Co - (MO). Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Union Electric Co - (MO) | 100.0% | 408 MW |
Nearby plants
Within 80 km.
| Overall Road Station | 8 MW | 42.9 km |
| Farmington Solar Farm | 3 MW | 44.3 km |
| Fredericktown Energy Center | 28 MW | 46 km |
| Walton Street Substation | 2 MW | 46.2 km |
| Elm Street Substation Generators | 6 MW | 46.9 km |