Alsey
Natural gas power plant in Scott County, Illinois. 173 MW of nameplate capacity across 6 generators, operated by Prairie Power, Inc.
Also known as Alsey Power Plant · EIA plant 7818
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 173 MWNameplate
- Generators
- 6 operatingEIA-860M, August 2026
- Operating since
- June 1999First generator online
- Operator
- Prairie Power, IncEIA operator ID 40307
- Grid
- MISOBalancing authority MISO
- Price nodes
- 6 MISO nodesResource nodes with prices
- Location
- Scott County, IL39.5698, −90.4360
- EIA plant ID
- 7818EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Alsey produces
Free · EIA-923Net generation, 2025
34.7 GWh
34,675 MWh, final
Capacity factor, 2025
2.3%
2024: 2.5%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
7.7–77.0
GWh a year. Low 2016, high 2022
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | 18,568 | Not reported | 12 of 12 |
| 2002 | 1,381 | Not reported | 12 of 12 |
| 2003 | 1,062 | Not reported | 12 of 12 |
| 2004 | 1,131 | Not reported | 12 of 12 |
| 2005 | 2,241 | Not reported | 12 of 12 |
| 2006 | 4,850 | Not reported | 12 of 12 |
| 2007 | 1,513 | Not reported | 12 of 12 |
| 2008 | 12 | Not reported | 12 of 12 |
| 2009 | 1,106 | Not reported | 12 of 12 |
| 2010 | 5,014 | 0.5% | 12 of 12 |
| 2011 | 4,373 | 0.4% | 12 of 12 |
| 2012 | 8,790 | 0.8% | 12 of 12 |
| 2013 | 4,236 | 0.4% | 12 of 12 |
| 2014 | 2,417 | 0.2% | 12 of 12 |
| 2015 | 10,296 | 0.9% | 12 of 12 |
| 2016 | 7,713 | Not reported | 12 of 12 |
| 2017 | 16,103 | 1.1% | 12 of 12 |
| 2018 | 21,066 | 1.4% | 12 of 12 |
| 2019 | 15,027 | 1.0% | 12 of 12 |
| 2020 | 29,764 | 2.0% | 12 of 12 |
| 2021 | 55,749 | 3.7% | 12 of 12 |
| 2022 | 77,028 | 5.1% | 12 of 12 |
| 2023 | 20,106 | 1.3% | 12 of 12 |
| 2024 | 38,728 | 2.5% | 12 of 12 |
| 2025 | 34,675 | 2.3% | 12 of 12 |
| 2026 (provisional, partial year) | Not reported | Not reported | 0 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free account · MISOEmissions
Free · EPA CAMPDCO₂, 2025
Not reported
US short tons. 2024: Not reported
SO₂, 2025
0
US short tons
NOx, 2025
15
US short tons
1 of 4 EPA units reported CO₂ in 2025 (ACT1, ACT2, ACT5, ACT6), matched to EIA plant 7818 through the EPA–EIA crosswalk.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| 1 | Natural Gas Fired Combustion Turbine | 30.0 | June 1999 |
| 2 | Natural Gas Fired Combustion Turbine | 30.0 | August 1999 |
| 3 | Natural Gas Fired Combustion Turbine | 20.0 | July 1999 |
| 4 | Natural Gas Fired Combustion Turbine | 20.0 | August 1999 |
| 5 | Natural Gas Fired Combustion Turbine | 25.0 | June 1999 |
| 6 | Natural Gas Fired Combustion Turbine | 48.0 | December 2016 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists Prairie Power, Inc as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
Generation potential vs reported
Monthly potential at seasonal net capability, next to EIA-923 output. Shows how much of the plant's capability was used.
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Power plants near Alsey
More plants operated by Prairie Power, Inc
Questions about Alsey
How much power does Alsey produce?
Alsey reported 34,675 MWh (34.7 GWh) of net generation in 2025, a 2.3% capacity factor on 173 MW of nameplate capacity.
Where is Alsey?
Alsey is in Scott County, Illinois, at 39.5698, −90.4360. It is in the Midcontinent Independent Transmission System Operator, Inc.. balancing area (MISO).
Who operates Alsey?
EIA-860M for August 2026 lists Prairie Power, Inc as the operator (EIA operator ID 40307). The operator is not always the owner.
When did Alsey start operating?
Its first generator began operating in June 1999, according to EIA-860M.
Does InfraMap have power prices for Alsey?
Yes. InfraMap has MISO day-ahead and real-time prices at 6 price nodes linked to Alsey, with the hub price and node-to-hub basis. Prices are free with an InfraMap account; pricing node names are part of InfraMap Pro.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- EPA CAMPD annual emissions through the EPA–EIA crosswalk, 1995 to 2025
- MISO day-ahead and real-time prices; node and hub assignments as of 2026-10-05
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page