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648 MW Natural Gas planned in St Louis, MO
648 MW
Nameplate Capacity
3
Generators
units
Natural Gas Fired Combustion Turbine
Technology
Planned: —
Planned Operation
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Coordinates
38.4017, -90.3358
County
St Louis, MO
Nearby Plants
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| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Union Electric Co - (MO) | — | — |
| Owner(s) | Union Electric Co - (MO) | — | — |
| Status | Planned | — | — |
Castle Bluff Energy Center is a 648 MW natural gas-fired power plant located in St. Louis County, Missouri. The plant is owned and operated by Union Electric Co. (MO). It consists of three natural gas-fired combustion turbine generators. The plant is connected to the Midcontinent Independent Transmission System Operator (MISO) and resides within the SERC Reliability Corporation NERC region.
Castle Bluff Energy Center is a significant power producer in Missouri, ranking as the 5th largest out of 20 power plants in the state, and 362nd nationally out of 945 plants. Recent news articles indicate a focus on grid-related topics (9 articles) and regulatory matters (1 article) concerning the plant.
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
Plant Substation (assumed)
generation · 138 kV · 0.2 km · nearest
Grid Substation (assumed)
transmission · 138 kV · wire-connected
No generation data available for this plant.
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2023
$782/kW
Est. Construction Cost
Total estimated cost: $506.7M
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Market Position
ISO/RTO Market
MISO
LMP Node
AMMO.MERAMEC4
Pricing Hub
ILLINOIS.HUB
Node Source
Curated node match
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 2026-05-31
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