Data last collected:
PowerPlantFactsEvidence report · prepared 19 October 2026https://powerplantfacts.com/entity/976
EIA plant 976
Marion · Williamson · IL
Marion
Operated by Southern Illinois Power Coop
Published location
Where is Marion?
This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.
37.619747, -88.953114
Open the interactive map ↗Map data © OpenStreetMap contributors
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.
174,370
261,793
358,821
434,645
565,273
653,949
784,332
880,000
973,468
1034,026
1153,538
1272,031
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 | 74,370 |
| 2 | 61,793 |
| 3 | 58,821 |
| 4 | 34,645 |
| 5 | 65,273 |
| 6 | 53,949 |
| 7 | 84,332 |
| 8 | 80,000 |
| 9 | 73,468 |
| 10 | 34,026 |
| 11 | 53,538 |
| 12 | 72,031 |
2024 monthly net generation
| Month | Net generation |
|---|---|
| 1 | 74,370 MWh |
| 2 | 61,793 MWh |
| 3 | 58,821 MWh |
| 4 | 34,645 MWh |
| 5 | 65,273 MWh |
| 6 | 53,949 MWh |
| 7 | 84,332 MWh |
| 8 | 80,000 MWh |
| 9 | 73,468 MWh |
| 10 | 34,026 MWh |
| 11 | 53,538 MWh |
| 12 | 72,031 MWh |
Operating generators
| ID | Technology | Fuel | MW | Status |
|---|---|---|---|---|
| 5 | Natural Gas Fired Combustion Turbine | NG | 75 | SB |
| 6 | Natural Gas Fired Combustion Turbine | NG | 75 | SB |
| 1 | Conventional Steam Coal | BIT | 33 | OP |
| 2 | Conventional Steam Coal | BIT | 33 | OP |
| 3 | Conventional Steam Coal | BIT | 33 | OP |
Continue exploring
Similar-capacity plants in the same state
Identity, technology and limitations
EIA plant ID
976
Sector
Electric Utility
Water source
Lake Egypt
Data edition
2024-final
Use this record
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 Marion 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 Marion
Variation in the published months
Across 12 numeric monthly generation entries, 7 has the highest recorded value (84,332 MWh) and 10 the lowest (34,026 MWh). Their difference is 50,306 MWh. Missing months have not been treated as zero.
Reading the MW column
In the 5 numeric rows displayed in this table, MW ranges from 33 (1, 2, 3) to 75 (5, 6). The difference is 42 in the column's stated units. This summary covers the displayed rows and retains the table's period and scope.
Generator capacity in different operating conditions
| Generator ID | Technology | Nameplate MW | Summer MW | Winter MW | Minimum load MW |
|---|---|---|---|---|---|
| 1 | Conventional Steam Coal | 33.0 | 40.0 | 40.0 | 30.0 |
| 2 | Conventional Steam Coal | 33.0 | 40.0 | 40.0 | 30.0 |
| 3 | Conventional Steam Coal | 33.0 | 40.0 | 40.0 | 30.0 |
| 5 | Natural Gas Fired Combustion Turbine | 75.0 | 70.0 | 90.0 | 40.0 |
| 6 | Natural Gas Fired Combustion Turbine | 75.0 | 70.0 | 90.0 | 40.0 |
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.