Alsey
Alsey is a 173 MW natural gas power plant in Scott County, Illinois, operated by Prairie Power, Inc. EIA-860M lists 6 generating units here, inside MISO. Its units entered service between 1999 and 2016.
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
- 173 MW
- 164.3 MW net summer
- Generating units
- 6
- In service
- 1999–2016
- EIA plant ID
- 7818
Where it is
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- County
- Scott County, Illinois
- Coordinates
- 39.5698, -90.436
- Balancing authority
- MISO
- Sector
- Electric Utility
Units, technology and status
- Operator of record
- Prairie Power, Inc
- Primary energy source
- Natural gas
- Technologies
- Natural Gas Fired Combustion Turbine
- Status
- Operating
Alsey: FAQ
- Where is Alsey?
- In Scott 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 Alsey?
- 173 MW of nameplate capacity across 6 units, as of the EIA-860M release for 2026-07.
- Who owns Alsey?
- EIA-860M names Prairie Power, Inc 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 Alsey LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Prairie Power, Inc 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 "Alsey LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is Alsey still running?
- EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.