Data last collected:
PowerPlantFactsEvidence report · prepared 19 October 2026https://powerplantfacts.com/entity/55856
EIA plant 55856
Marissa · St Clair · IL
Prairie State Generating Station
Operated by Prairie State Generating Co LLC
Published location
Where is Prairie State Generating Station?
This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.
38.279167, -89.666944
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Capacity is not generation. Nameplate MW describes equipment; annual MWh describes recorded output. Proposed and retired units are not added to operating capacity.
Equipment mix
Operating capacity by technology
Grouped from this plant’s represented generator records. Use the IL plant index for regional peers.
See the evidence
Electricity output across the year
Monthly net generation shows the seasonal shape of this plant's represented output. A negative value is retained when the source reports net consumption.
11,139,375.05
2998,152
31,160,460.01
41,035,389.02
51,016,610.97
6936,699
71,158,557
81,172,746
91,056,527.99
10918,080
11543,866
12311,285
MWh net generation · 2024 final edition · EIA 923 represented operating rows. 12 of 12 supplied rows shown; 0 missing values omitted. Months with no reported numeric value are omitted, not treated as zero.
Read the chart as a table
| Record | MWh net generation |
|---|---|
| 1 | 1,139,375.05 |
| 2 | 998,152 |
| 3 | 1,160,460.01 |
| 4 | 1,035,389.02 |
| 5 | 1,016,610.97 |
| 6 | 936,699 |
| 7 | 1,158,557 |
| 8 | 1,172,746 |
| 9 | 1,056,527.99 |
| 10 | 918,080 |
| 11 | 543,866 |
| 12 | 311,285 |
2024 monthly net generation
| Month | Net generation |
|---|---|
| 1 | 1,139,375 MWh |
| 2 | 998,152 MWh |
| 3 | 1,160,460 MWh |
| 4 | 1,035,389 MWh |
| 5 | 1,016,611 MWh |
| 6 | 936,699 MWh |
| 7 | 1,158,557 MWh |
| 8 | 1,172,746 MWh |
| 9 | 1,056,528 MWh |
| 10 | 918,080 MWh |
| 11 | 543,866 MWh |
| 12 | 311,285 MWh |
Operating generators
| ID | Technology | Fuel | MW | Status |
|---|---|---|---|---|
| PC1 | Conventional Steam Coal | BIT | 883 | OP |
| PC2 | Conventional Steam Coal | BIT | 883 | OP |
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Similar-capacity plants in the same state
Identity, technology and limitations
EIA plant ID
55856
Sector
IPP Non-CHP
Water source
Kaskaskia River
Data edition
2024-final
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Questions this evidence can answer
01What exactly is this record?
Use the name, place, date and identifiers above to confirm that you have the right Prairie State Generating Station power plant: capacity and generation | PowerPlantFacts record.
02What does the evidence establish?
Read the reported values with their units, coverage dates and source notes. Keep observed facts separate from estimates or interpretation.
03What should I verify next?
Follow the primary-source links and check the limitations before using this evidence for a decision, comparison or citation.
A closer look at Prairie State Generating Station
Variation in the published months
Across 12 numeric monthly generation entries, 8 has the highest recorded value (1,172,746 MWh) and 12 the lowest (311,285 MWh). Their difference is 861,461 MWh. Missing months have not been treated as zero.
Generator capacity in different operating conditions
| Generator ID | Technology | Nameplate MW | Summer MW | Winter MW | Minimum load MW |
|---|---|---|---|---|---|
| PC1 | Conventional Steam Coal | 883.0 | 815.0 | 815.0 | 420.0 |
| PC2 | Conventional Steam Coal | 883.0 | 815.0 | 815.0 | 420.0 |
EIA-860 2024 final source. Ratings describe capacity, not actual generation or availability. Missing ratings are not zero.
Source: US Energy Information Administration Form EIA-860 2024 plant and operable-generator workbooks; archive 2024. US EIA-authored information is generally public domain; cite EIA, preserve third-party exceptions, changes and no-endorsement context. Source-specific derived data.