Trigen St. Louis
Natural gas power plant in St Louis County, Missouri. 34.2 MW of nameplate capacity across 6 generators, operated by Centerstream STL, LLC.
Also known as Ashley Energy · EIA plant 56309
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 34.2 MWNameplate
- Generators
- 6 operatingEIA-860M, August 2026
- Operating since
- June 1999First generator online
- Operator
- Centerstream STL, LLCEIA operator ID 50130
- Grid
- MISOBalancing authority MISO
- Price nodes
- 1 MISO nodeResource nodes with prices
- Location
- St Louis County, MO38.6359, −90.1809
- EIA plant ID
- 56309EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Trigen St. Louis produces
Free · EIA-923Net generation, 2025
48.3 GWh
48,300 MWh, final
Capacity factor, 2025
16.1%
2024: 28.1%
January to July 2026
6.54 GWh
Provisional
Range, 2015 to 2025
0.0–84.4
GWh a year. Low 2020, high 2024
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | Not reported | Not reported | 0 of 12 |
| 2002 | Not reported | Not reported | 0 of 12 |
| 2003 | Not reported | Not reported | 0 of 12 |
| 2004 | 46,230 | Not reported | 12 of 12 |
| 2005 | 5,236 | Not reported | 12 of 12 |
| 2006 | 30,407 | Not reported | 12 of 12 |
| 2007 | 44,941 | Not reported | 12 of 12 |
| 2008 | 39,983 | Not reported | 12 of 12 |
| 2009 | 41,372 | Not reported | 12 of 12 |
| 2010 | 54,513 | Not reported | 12 of 12 |
| 2011 | 40,925 | 12.3% | 12 of 12 |
| 2012 | 49,454 | 14.8% | 12 of 12 |
| 2013 | 24,579 | 7.4% | 12 of 12 |
| 2014 | 17,240 | 5.2% | 12 of 12 |
| 2015 | 10,523 | 3.2% | 12 of 12 |
| 2016 | 18,548 | 5.6% | 12 of 12 |
| 2017 | 26,281 | 7.9% | 12 of 12 |
| 2018 | 50,605 | 15.2% | 12 of 12 |
| 2019 | 19,528 | 5.9% | 12 of 12 |
| 2020 | 0 | 0.0% | 12 of 12 |
| 2021 | 0 | 0.0% | 12 of 12 |
| 2022 | 38,545 | 11.6% | 12 of 12 |
| 2023 | 78,973 | Not reported | 12 of 12 |
| 2024 | 84,435 | 28.1% | 12 of 12 |
| 2025 | 48,300 | 16.1% | 12 of 12 |
| 2026 (provisional, partial year) | 6,541 | 3.8% | 7 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free account · MISOEmissions
Free · EPA CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| CT-1 | Natural Gas Fired Combined Cycle | 5.9 | July 1999 |
| CT-2 | Natural Gas Fired Combined Cycle | 5.9 | July 1999 |
| IC-1 | Natural Gas Internal Combustion Engine | 1.2 | June 1999 |
| ST-3 | Natural Gas Fired Combined Cycle | 18.2 | June 2000 |
| ST-4 | Natural Gas Steam Turbine | 1.5 | June 1999 |
| ST-5 | Natural Gas Steam Turbine | 1.5 | June 1999 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists Centerstream STL, LLC as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
Generation potential vs reported
Monthly potential at seasonal net capability, next to EIA-923 output. Shows how much of the plant's capability was used.
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Questions about Trigen St. Louis
How much power does Trigen St. Louis produce?
Trigen St. Louis reported 48,300 MWh (48.3 GWh) of net generation in 2025, a 16.1% capacity factor on 34.2 MW of nameplate capacity. From January to July 2026 it reported 6.54 GWh, which is provisional.
Where is Trigen St. Louis?
Trigen St. Louis is in St Louis County, Missouri, at 38.6359, −90.1809. It is in the Midcontinent Independent Transmission System Operator, Inc.. balancing area (MISO).
Who operates Trigen St. Louis?
EIA-860M for August 2026 lists Centerstream STL, LLC as the operator (EIA operator ID 50130). The operator is not always the owner.
When did Trigen St. Louis start operating?
Its first generator began operating in June 1999, according to EIA-860M.
Does InfraMap have power prices for Trigen St. Louis?
Yes. InfraMap has MISO day-ahead and real-time prices at 1 price node linked to Trigen St. Louis, with the hub price and node-to-hub basis. Prices are free with an InfraMap account; pricing node names are part of InfraMap Pro.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- MISO day-ahead and real-time prices; node and hub assignments as of 2026-10-05
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page