Interstate
Interstate is a 139 MW natural gas power plant in Sangamon County, Illinois, operated by City of Springfield - (IL). EIA-860M lists 1 generating unit here, inside MISO. Its unit entered service in 1997.
As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m
- Nameplate capacity
- 138.6 MW
- 109.6 MW net summer
- Generating units
- 1
- In service
- 1997
- EIA plant ID
- 7425
Where it is
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- County
- Sangamon County, Illinois
- Coordinates
- 39.8233, -89.5891
- Balancing authority
- MISO
- Sector
- Electric Utility
Units, technology and status
- Operator of record
- City of Springfield - (IL)
- Primary energy source
- Natural gas
- Technologies
- Natural Gas Fired Combustion Turbine
- Status
- Operating
Interstate: FAQ
- Where is Interstate?
- In Sangamon County, Illinois (IL). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.
- How big is Interstate?
- 139 MW of nameplate capacity across 1 unit, as of the EIA-860M release for 2026-07.
- Who owns Interstate?
- EIA-860M names City of Springfield - (IL) as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.
- Is this the same as Interstate LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — City of Springfield - (IL) here — not the project company that holds the asset. Project companies are commonly registered as an LLC carrying the plant's name, so a search for "Interstate LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is Interstate still running?
- EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.