St. Mary Clean Energy Center — United States of America
Cogeneration power plant in Louisiana, United States of America. Approximate location 29.6846, -91.4706.
CogenerationLouisianaUnited States of AmericaCO₂ modelled
St. Mary Clean Energy Center is a 58.2 MW cogeneration power plant in Louisiana, United States of America. It is operated by Cleco Power LLC. Based on reported annual generation of 85 GWh, it can supply roughly 24k homes. It ranks #3468 of 10,884 United States of America power plants by installed capacity. Commissioned in 2019, it is around 7 years old — recently built. Its modelled annual emissions are 48,747 t CO₂/yr (Climate TRACE), equivalent to about 11k cars driven for a year. In context, the national grid averages 384 gCO₂/kWh (43.0% low-carbon) (2025).
Plant data: WRI Global Power Plant Database (CC BY 4.0), id USA0060610.
Data status
Known data
Modelled source data
Calculated from dataset
Not available
Known, modelled and calculated values are kept separate. Missing fields are shown as unavailable.
Data provenance
Capacity and fuel are the upstream open-dataset record, not yet matched to a 2026 registry or GEM entry.
capacity: WRI GPPD; fuel: WRI GPPD
In context: how this plant compares
At 58.2 MW, St. Mary Clean Energy Center is well above the median cogeneration plant in United States of America (26 MW). This facility converts its energy source into electricity for the grid; its capacity, fuel type and location determine its role in the national power mix.
Capacity comparison computed from the WRI Global Power Plant Database; fuel-type context is general engineering background.
~48,747 t CO₂/yr (modelled) — in everyday terms
This facility's annual emissions are roughly equivalent to:
Equivalencies via US EPA Greenhouse Gas Equivalencies; modelled emissions from Climate TRACE.
Key facts
- Load factor
- 17%, from 85 GWh of reported generation; the median for 31 cogeneration plants in United States of America that report generation is 47%
- Share of United States of America cogeneration capacity
- 5.6% of 1,037 MW across 34 plants in this dataset
- Age among peers
- 33 of 34 dated cogeneration plants in United States of America are older
Calculated from the capacity and generation records in this dataset (WRI Global Power Plant Database (CC BY 4.0)).
Capacity vs largest cogeneration plants in United States of America
Installed capacity (MW), WRI Global Power Plant Database (CC BY 4.0).
Owner
Operated by Cleco Power LLC. All plants by this company →
Local climate & thermal context
This cogeneration plant produces electricity and useful heat together for higher fuel efficiency. It sits in a humid subtropical climate (Köppen Cfa) — Northern Hemisphere, latitude 29.7°N — which shapes how much energy it can produce and how its output varies through the year.
Monthly mean temperature
Heating degree-days here run 76% below the median power plant in this dataset — a proxy for how much extra energy heated equipment must replace through its surfaces in winter.
Climate heat-demand index: 22/100 — this site sits in the bottom third of the power plants we cover by heating degree-days.
Climate normals: WorldClim 2.1 (1970–2000 monthly normals, 10 arc-min, CC BY 4.0); zone: Köppen-Geiger world climate classification (Kottek et al. 2006, 0.5° grid). Degree-days & heat-demand index computed by PowerAtlas — a modelled heat-demand proxy, not a measured site figure.
Site climate & environmental severity
This site sits in an aggressive, high-corrosion environment (estimated ISO 9223 class C5 — Very high), with marine salt corrosion the leading environmental stress.
Indicative estimate via the ISO 9223:2012 informative method (atmospheric corrosivity from temperature, time-of-wetness and airborne salinity), using WorldClim climate normals, the Köppen-Geiger class and coast distance. Indicative, not a measured corrosion rate.
How it compares & nearby plants
The #5 largest cogeneration power plant of 34 in United States of America by capacity.
United States of America has 34 cogeneration power plants in this dataset, together about 1,037 MW of capacity.
Nearby power plants
- Neptune Gas Processing Plant · Other · 4.5 MW · Louisiana
- Teche · Gas · 390.7 MW · Louisiana
- Franklin (LA) · Gas · 10 MW · Louisiana
- LEPA Unit No. 1 · Gas · 74.1 MW · Louisiana
- Morgan City · Gas · 70.3 MW · Louisiana
- Ivanhoe Generation Facility · Other · 31 MW · Louisiana
Location
Coordinates 29.6846, -91.4706 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.
Frequently asked questions
What type of power plant is St. Mary Clean Energy Center?
St. Mary Clean Energy Center is a 58.2 MW cogeneration power plant in Louisiana, United States of America, commissioned in 2019.
How much electricity does St. Mary Clean Energy Center generate?
St. Mary Clean Energy Center generates about 85 GWh of electricity per year.
Who operates St. Mary Clean Energy Center?
St. Mary Clean Energy Center is operated by Cleco Power LLC.
How much CO₂ does St. Mary Clean Energy Center emit?
St. Mary Clean Energy Center has modelled emissions of about 48,747 tonnes of CO₂ per year (Climate TRACE).