Callaway Energy Center is a nuclear generating station in Callaway County, Missouri, associated with the MISO registry. The EIA plant baseline lists 1,235.8 MW of nameplate capacity. Ameren's 2026 facilities fact sheet lists 1,194 MW and says the station began operation in 1984. The profile preserves the source-specific capacity figures rather than treating them as interchangeable.
Canonical EIA plant baseline.
plant-6153
Similar plants ranked by technology, capacity, and distance.
Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| 1 | 1,235.8 MW 1,190 MW summer | Nuclear Nuclear · ST | Dec 1984 | Operating |
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
Deterministic links to ERCOT market resources, price records, outage disclosures, queue records, and nearby infrastructure. Candidate joins remain labeled until corroborated.
Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.
Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.
Project milestones and public references behind the asset profile.
Ameren's 2026 facilities fact sheet says Callaway began operation in 1984.
Monthly generation is reported through EIA-923. Capacity factor uses the current EIA nameplate capacity and is shown only for complete calendar years.
| Largest reported plants | Capacity | State | |
|---|---|---|---|
| Labadie | 2,389.4 MW | MO | |
| CallawayCurrent | 1,235.8 MW | MO | |
| Sioux | 1,099.4 MW | MO | |
| Audrain Generating Station | 814.4 MW | MO | |
| Goose Creek Energy Center | 684 MW | IL | |
| Venice | 586 MW | IL | |
| Raccoon Creek Energy Center | 456 MW | IL | |
| Taum Sauk | 408 MW | MO |
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
EIA-860 lists generator 1 with this operating date.
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
Callaway has a reported capacity of 1,235.8 MW. Source: EIA Form 860M.
Callaway is a nuclear facility in Callaway County, MO, participating in the MISO market.
Callaway is in Callaway County, MO, inside the MISO balancing area.
Callaway is operated by Union Electric Co - (MO) according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
Callaway reported 8,087.2 GWh over the twelve months to 2026-04. Figures are net generation as filed to EIA-923.
By capacity, Callaway ranks #40 of 54 operating plants of the same technology nationally. It ranks #1 of 1 in MO.
