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1235.8 MW Nuclear operating in Callaway, MO
1,235.8 MW
Nameplate Capacity
1
Generators
unit
Nuclear
Technology
1984
Operating Since
Coordinates
38.7589, -91.7788
County
Callaway, MO
Nearby Plants
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Owner data does not fully agree across sources.
EIA typically reports the operating utility, while GEM resolves to the financial owner or parent corporation. Both can be correct.
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Union Electric Co - (MO) | Ameren UE; Union Electric | Ameren Missouri |
| Owner(s) | Union Electric Co - (MO) | Ameren UE; Union Electric Co | — |
| Status | Operating | operating | — |
GEM identifies the owner as Ameren UE; Union Electric Co
This entity is not yet in the GEM ownership database — chain unavailable.
The Callaway Plant is a nuclear power plant located in Callaway County, Missouri. The plant is Missouri's only nuclear power plant and is close to Fulton, Missouri. The 2,767 acres (1,120 ha) site began operations on December 19, 1984. It generates electricity from one 1,190-megawatt Westinghouse four-loop pressurized water reactor and a General Electric turbine-generator. The Ameren Corporation owns and operates the plant through its subsidiary Ameren Missouri. It is one of several Westinghouse reactors designs called the "Standard Nuclear Unit Power Plant System," or SNUPPS.
Read more on WikipediaCallaway is a 1,235.8 MW nuclear power plant located in Callaway County, Missouri. The plant, which began operating in 1984, is owned and operated by Union Electric Co. The facility consists of a single nuclear generator. Callaway is the largest nuclear power plant in Missouri, and ranks 39th out of 55 nuclear plants nationally.
The plant's latest annual generation was 7,116,161 MWh, resulting in a capacity factor of 65.6%. Callaway operates within the Midcontinent Independent Transmission System Operator (MISO) balancing authority and the SERC NERC region. Financial data indicates an installed cost of $2,541.08 per kW, based on FERC data.
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
345.0 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.
883.6K MWh
Latest Month
7.1M MWh
Annual Generation
65.6%
Capacity Factor
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Nuclear · UNION ELECTRIC COMPANY · Data from 2015–2024
$2,960/kW
Installed Cost
$40/kW
Annual CapEx
$21.4/MWh
Operating Cost
Annual Capital & Operating Expenses
Cumulative Installed Cost
Per-Unit Cost Trends
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Point of Interconnection
Nearest Substation
Callaway Substation · 345 kV
Substation Distance
< 10 km
Operator
Ameren
Coord Source
OSM spatial
Market Position
ISO/RTO Market
MISO
LMP Node
AMMO.CALLAWAY1
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 2026-04-19
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Callaway Energy Center experienced an unplanned eight-hour shutdown after water from a storage basin entered the steam generators; NRC was notified and Ameren began restoration, completing it within days.
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