Interstate
Sangamon County, Illinois · EIA plant ID 7425 · Operator: City of Springfield - (IL)
Nameplate139MWSummer 110 MW
Generators1in service
Net generation58GWh12 mo to Dec 2025
Capacity factor6%gas/coal/oil units, summer MW
Heat rate12,483Btu/kWhfossil units, electric fuel, HHV
First online1997Runs as peaking
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), gas/coal/oil units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 23.3 | 2.3% | 13,416 |
| 2002 | 9.1 | 0.8% | 13,580 |
| 2003 | 10 | 0.9% | 12,717 |
| 2004 | 3.9 | 0.4% | 13,137 |
| 2005 | 20.8 | 1.9% | 14,636 |
| 2006 | 10.3 | 0.9% | 13,505 |
| 2007 | 19 | 1.7% | 12,671 |
| 2008 | 11.4 | 1.0% | 13,038 |
| 2009 | 5.6 | 0.6% | 13,166 |
| 2010 | 31.8 | 3.2% | 12,965 |
| 2011 | 15.7 | 1.6% | 12,373 |
| 2012 | 7.6 | 0.8% | 13,922 |
| 2013 | 7.4 | 0.8% | 14,713 |
| 2014 | 8.8 | 0.9% | 12,983 |
| 2015 | 21.4 | 2.2% | 12,179 |
| 2016 | 44.3 | 4.5% | 13,536 |
| 2017 | 18.4 | 1.9% | 12,616 |
| 2018 | 30.4 | 3.1% | 12,823 |
| 2019 | 10.9 | 1.2% | 12,075 |
| 2020 | 29 | 3.1% | — |
| 2021 | 1.2 | 0.1% | 10,776 |
| 2022 | 1.4 | 0.2% | 9,889 |
| 2023 | 39.5 | 4.0% | 14,072 |
| 2024 | 50.8 | 5.3% | 14,863 |
| 2025 | 57.5 | 6.0% | 12,483 |
Fuel capability
Gas-fired turbines (CT/GT/CA/CS) that can also burn liquid fuel. EIA-860 Schedule 3 for capability, EIA-923 for actual burn.
StatusLikely still dual fuel
Liquid fuel burned · 36 mo6,631 MMBtu
Last month with liquid burnDec 2025
Switch while operatingYes
Net summer MW on gas109
Net summer MW on oil107
Time gas → oilup to 1 h (EIA 1H)
Time oil → gasup to 1 h (EIA 1H)
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| 1 | Natural Gas Fired Combustion Turbine | GT | 138.6 | 109.6 | Sep 1997 | Operating | — | coming soon |
Owner / operator
Operator: City of Springfield - (IL). Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| City of Springfield - (IL) | 100.0% | 139 MW |
Nearby plants
Within 80 km.
| Factory | 27 MW | 4.1 km |
| Reynolds | 18 MW | 4.8 km |
| Lakeside | 5 MW | 7.4 km |
| Dallman | 230 MW | 7.7 km |
| ILL060-Sangamon-Atchison | 2 MW | 24.9 km |
| Pike Creek Wind | — | 26.6 km |