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Marion — United States of America

Coal power plant in Illinois, United States of America. Approximate location 37.6197, -88.9531.

CoalIllinoisUnited States of AmericaMothballed

Marion is a 422 MW coal power station in Illinois, United States of America. It ranks #1336 of 10,884 United States of America power plants by installed capacity. Commissioned in 1983, it is around 43 years old — long-established. In context, coal supplies about 16.3% of United States of America's electricity; the national grid averages 384 gCO₂/kWh (43.0% low-carbon) (2025).

422MW installed capacity

1983commissioned (~43 yrs)

Plant data: WRI Global Power Plant Database (CC BY 4.0), id USA0000976.

Data status

Known data

FacilityMarion WRI

CountryUnited States of America · Illinois WRI

Coordinates37.6197, -88.9531 WRI

FuelCoal WRI

MW installed capacity422 MW GEM · 2026 · L100000103868; part of a generating complex

Verification noteQuality label backfilled from existing source-backed capacity provenance on 2026-07-05; capacity value was not changed. source-verified

OwnerSouthern Illinois Power Coop WRI

Commissioned1983 WRI

Calculated from dataset

Capacity rank in country#1336 / 10884 calculated

Fuel-specific rank in country#451 / 802 calculated

Capacity vs country/fuel peers0.76× · 558 MW · n=802 calculated

Climate13.4°C · HDD 2,353 derived from coordinates

Environmental severityC3 · 36/100 derived from coordinates

Not available

TechnologyNot available not in dataset

GWh reported / yrNot available not in dataset

CO₂ emissionsNot available not in dataset

Known, modelled and calculated values are kept separate. Missing fields are shown as unavailable.

Capacity provenance

The public capacity above is the current source-record value. A 2026 tracker candidate lists 120 MW for Marion Plant, but it is not used as the public primary value until scope is verified (unit vs operating vs installed/project total).

Data provenance

Source of the capacity and fuel values:

capacity: GEM · 2026 · L100000103868; fuel: WRI GPPD

In context: how this plant compares

At 422 MW, Marion is below the median coal plant in United States of America (558 MW). Its current lifecycle status is “Mothballed” — so it is not yet, or no longer, generating at full output. Coal plants burn pulverised coal to raise high-pressure steam for a turbine; they run as baseload but are the most carbon-intensive mainstream source and the first targeted for retirement or efficiency retrofits.

Capacity comparison computed from the WRI Global Power Plant Database; fuel-type context is general engineering background.

How it compares & nearby plants

The #451 largest coal power plant of 802 in United States of America by capacity.

United States of America has 802 coal power plants in this dataset, together about 621,194 MW of capacity.

Nearby power plants

Marion Plant · Coal · 392 MW · Illinois
John A Logan College Solar · Solar · 1.3 MW · Illinois
SIUC · Coal · 5.1 MW · Illinois
MEPI GT Facility · Gas · 301.5 MW · Illinois
Joppa Steam · Coal · 1,099.8 MW · Illinois
Joppa Steam Plant · Coal · 1,099.8 MW · Illinois

Location

Coordinates 37.6197, -88.9531 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.

Frequently asked questions

What type of power plant is Marion?

Marion is a 422 MW coal power plant in Illinois, United States of America, commissioned in 1983.

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