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208 MW Hydro operating in Miller, MO
208 MW
Nameplate Capacity
8
Generators
units
Conventional Hydroelectric
Technology
1931
Operating Since
Coordinates
38.2044, -92.6239
County
Miller, MO
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| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Union Electric Co - (MO) | Union Electric | — |
| Owner(s) | Union Electric Co - (MO) | Ameren | — |
| Status | Operating | operating | — |
Bagnell Dam impounds the Osage River in the U.S. state of Missouri, creating the Lake of the Ozarks. The dam is located in the city of Lakeside in Miller County, near the Camden-Miller County line. The 148-foot (45 m) tall concrete gravity dam was built by the Union Electric Company to generate hydroelectric power at its Osage Powerplant. It is 2,543 feet (775 m) long, including a 520-foot (160 m) long spillway and a 511-foot (156 m) long power station. The facility with eight generators has a maximum capacity of 215 megawatts. The dam provides power to 42,000 homes.
Read more on WikipediaOsage Dam is a hydroelectric power plant located in Miller County, Missouri. The plant, which began operating in 1931, has a total capacity of 208 MW distributed across 8 generators. It is owned and operated by Union Electric Co. (MO), a subsidiary of Ameren. The primary fuel source is water (WAT), and the plant utilizes conventional hydroelectric technology. Osage Dam ranks as the second-largest of four hydroelectric plants in Missouri, and 90th out of 194 nationwide.
In the most recent year with available data, Osage Dam generated 497,107 MWh of electricity, resulting in a capacity factor of 27.2%. The plant operates within the Midcontinent Independent Transmission System Operator (MISO) balancing authority and the SERC NERC region. Financial data indicates an installed cost of $787.77 per kW.
Generated from EIA, GEM, and public data sources
ISO/RTO
MISO
Market
ISO/RTO Member
NERC Region
SERC — SERC Reliability Corporation
Balancing Authority
Midcontinent Independent Transmission System Operator, Inc.. (MISO)
Grid Voltage
138.0 kV
Regulatory Status
RE — Regulated
Entity Type
Investor-Owned Utility
Sector
Electric Utility
Monthly net generation as reported to EIA-923 — useful for historical context. Confidence varies sharply by fuel type; the band above and the “About this data” button explain the caveats specific to this plant and how InfraSure’s in-house model handles them.
4.1K MWh
Latest Month
497.1K MWh
Annual Generation
27.2%
Capacity Factor
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Energy storage · UNION ELECTRIC COMPANY · Data from 2015–2024
$804/kW
Installed Cost
$11.5/MWh
Operating Cost
Annual Capital & Operating Expenses
Cumulative Installed Cost
Per-Unit Cost Trends
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Market Position
ISO/RTO Market
MISO
LMP Node
AMMO.OSAGE1
Pricing Hub
ILLINOIS.HUB
Location Type
Generation Node
Node Source
EIA-860 direct report
No wholesale contracts disclosed in FERC EQR for this plant.
FERC EQR captures bilateral wholesale energy + capacity contracts ≥$1M/yr filed quarterly by jurisdictional sellers — covers renewable PPAs, thermal energy sales agreements, capacity contracts, and tolling agreements alike. Many plants don't appear: regulated-utility output flows to ratepayers via cost-of-service rather than bilateral contracts; small projects fall below the filing threshold; tax-equity-financed renewables route offtake to investors not utilities; merchant plants sell into ISO clearing markets without bilateral contracts. News-extracted buyer facts (below) may surface contracts disclosed only through announcements.
Last updated 2026-03-26
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Ameren Missouri completed a 'once-in-a-lifetime' major capital upgrade to Bagnell Dam (Osage Energy Center) ahead of the facility's centennial.
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