Osage Dam
Miller County, Missouri · EIA plant ID 2106 · Operator: Union Electric Co - (MO)
Nameplate208MWSummer 234 MW
Generators8in service
Net generation499GWh12 mo to Dec 2025
Capacity factor24%hydro units, summer MW
Heat rate—thermal plants only
First online1931
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), hydro units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
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 | 449.9 | 24.3% | — |
| 2002 | 436.5 | 23.5% | — |
| 2003 | 187.9 | 9.5% | — |
| 2004 | 693.7 | 34.9% | — |
| 2005 | 540 | 27.8% | — |
| 2006 | 75.9 | 3.9% | — |
| 2007 | 652.9 | 33.6% | — |
| 2008 | 948.7 | 45.8% | — |
| 2009 | 957.3 | 46.7% | — |
| 2010 | 813.8 | 39.7% | — |
| 2011 | 499.1 | 23.7% | — |
| 2012 | 298.3 | 14.1% | — |
| 2013 | 667.3 | 31.7% | — |
| 2014 | 232.2 | 11.0% | — |
| 2015 | 754.2 | 37.2% | — |
| 2016 | 609.2 | 30.0% | — |
| 2017 | 624.9 | 30.5% | — |
| 2018 | 340 | 16.6% | — |
| 2019 | 1,216 | 59.3% | — |
| 2020 | 879.9 | 42.8% | — |
| 2021 | 861.6 | 42.0% | — |
| 2022 | 541.6 | 26.4% | — |
| 2023 | 176.1 | 8.6% | — |
| 2024 | 497.1 | 24.2% | — |
| 2025 | 498.9 | 24.3% | — |
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 | Conventional Hydroelectric | HY | 27.5 | 31 | Oct 1931 | Operating | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 27.5 | 24 | Oct 1931 | Operating | — | coming soon |
| 3 | Conventional Hydroelectric | HY | 27.5 | 31 | Oct 1931 | Operating | — | coming soon |
| 4 | Conventional Hydroelectric | HY | 27.5 | 24 | Oct 1931 | Operating | — | coming soon |
| 5 | Conventional Hydroelectric | HY | 27.5 | 31 | Oct 1931 | Operating | — | coming soon |
| 6 | Conventional Hydroelectric | HY | 27.5 | 31 | Oct 1931 | Operating | — | coming soon |
| 7 | Conventional Hydroelectric | HY | 21.5 | 31 | Oct 1953 | Operating | — | coming soon |
| 8 | Conventional Hydroelectric | HY | 21.5 | 31 | Oct 1953 | 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% | 208 MW |
Nearby plants
Within 80 km.
| Niangua | 3 MW | 35.5 km |
| Waynesville Solar Farm (MO) | 3 MW | 55.1 km |
| Fairgrounds | 68 MW | 55.7 km |
| Lebanon Solar Farm (MO) | 3 MW | 59.8 km |
| Moreau | 61 MW | 59.9 km |
| Ameresco Jefferson City | 3 MW | 63.6 km |