Joliet 29 — United States of America
Gas power plant in Illinois, United States of America. Approximate location 41.4946, -88.1238.
GasIllinoisUnited States of AmericaSteamCO₂ measured
Joliet 29 is a 1,320 MW gas power station in Illinois, United States of America. It is operated by Midwest Generations EME LLC. Based on reported annual generation of 1,420 GWh, it can supply roughly 406k homes. It ranks #392 of 10,884 United States of America power plants by installed capacity. Commissioned in 1965, it is around 61 years old — an older, legacy facility. Its annual emissions of 417,353 t CO₂/yr (US EPA GHGRP) are equivalent to about 97k cars driven for a year. In context, gas supplies about 40.0% of United States of America's electricity; the national grid averages 384 gCO₂/kWh (43.0% low-carbon) (2025).
Plant data: WRI Global Power Plant Database (CC BY 4.0), id USA0000384.
Data status
Known data
Calculated from dataset
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 1,320 MW, Joliet 29 is well above the median gas plant in United States of America (121.2 MW). Technically it is described as Steam. Gas plants burn natural gas either in open-cycle turbines for fast peaking, or in combined-cycle units that recover exhaust heat in an HRSG to reach roughly 55–62% efficiency — the cleanest-burning fossil option.
Capacity comparison computed from the WRI Global Power Plant Database; fuel-type context is general engineering background.
417,353 t CO₂/yr — in everyday terms
This facility's annual emissions are roughly equivalent to:
Equivalencies via US EPA Greenhouse Gas Equivalencies; emissions per US EPA GHGRP (measured for US EPA/EU ETS, modelled for Climate TRACE).
Key facts
- Load factor
- 12%, from 1,420 GWh of reported generation; the median for 1622 gas plants in United States of America that report generation is 26%
- Generation trend
- 5,650 GWh in 2013 and 1,420 GWh in 2019 (−75%)
- Highest and lowest year
- 2013: 5,650 GWh; 2017: 322 GWh
- Share of United States of America gas capacity
- 0.2% of 789,950 MW across 2,165 plants in this dataset
- Age among peers
- 91 of 1,973 dated gas 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)).
Reported generation trend
Annual generation (GWh), WRI Global Power Plant Database (CC BY 4.0).
Owner
Operated by Midwest Generations EME LLC.
Local climate & thermal context
This gas plant burns natural gas in a turbine — often in a combined-cycle setup — to generate electricity. It sits in a hot-summer humid continental climate (Köppen Dfa) — Northern Hemisphere, latitude 41.5°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 38% above 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: 73/100 — this site sits in the top third of the power plants we cover by heating degree-days.
A gas turbine here also runs ~0% below its ISO (15°C) rating at this annual mean (typical CCGT curve, estimate).
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 a moderately corrosive environment (estimated ISO 9223 class C3 — Medium), with thermal cycling 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 #117 largest gas power plant of 2165 in United States of America by capacity.
United States of America has 2165 gas power plants in this dataset, together about 789,950 MW of capacity.
Nearby power plants
- Joliet 29 Generating Station · Coal · 1,320 MW · Illinois
- Joliet 9 Generating Station · Coal · 360.4 MW · Illinois
- Joliet 9 · Gas · 360.4 MW · Illinois
- Jake Energy Storage Center · Storage · 19.8 MW · Illinois
- IKEA Joliet Rooftop PV System · Solar · 2 MW · Illinois
- Elwood Energy LLC · Gas · 1,344 MW · Illinois
Location
Coordinates 41.4946, -88.1238 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.
Frequently asked questions
What type of power plant is Joliet 29?
Joliet 29 is a 1,320 MW gas power plant in Illinois, United States of America, commissioned in 1965.
How much electricity does Joliet 29 generate?
Joliet 29 generates about 1,420 GWh of electricity per year.
Who operates Joliet 29?
Joliet 29 is operated by Midwest Generations EME LLC.
How much CO₂ does Joliet 29 emit?
Joliet 29 has measured emissions of about 417,353 tonnes of CO₂ per year (US EPA GHGRP).