Neil Simpson II
Coal and natural gas power plant in Campbell County, Wyoming. 130 MW of nameplate capacity across 2 generators, operated by Black Hills Power, Inc..
Also known as EIA plant 7504
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 130 MWCoal 90.0 · Natural gas 40.0
- Generators
- 2 operatingEIA-860M, August 2026
- Operating since
- September 1995First generator online
- Operator
- Black Hills Power, Inc.EIA operator ID 19545
- Grid
- WACMBalancing authority WACM
- Price nodes
- None linkedNo verified ISO node
- Location
- Campbell County, WY44.2856, −105.3833
- EIA plant ID
- 7504EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Neil Simpson II produces
Free · EIA-923Net generation, 2025
642 GWh
641,838 MWh, final
Capacity factor, 2025
56.4%
2024: 57.9%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
557.4–725.2
GWh a year. Low 2017, high 2020
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 860,319 | Not reported | 12 of 12 |
| 2001 | 965,084 | Not reported | 12 of 12 |
| 2002 | 878,364 | Not reported | 12 of 12 |
| 2003 | 787,456 | Not reported | 12 of 12 |
| 2004 | 693,486 | Not reported | 12 of 12 |
| 2005 | 666,602 | Not reported | 12 of 12 |
| 2006 | 740,759 | Not reported | 12 of 12 |
| 2007 | 732,221 | Not reported | 12 of 12 |
| 2008 | 725,358 | Not reported | 12 of 12 |
| 2009 | 679,545 | Not reported | 12 of 12 |
| 2010 | 703,660 | 66.9% | 12 of 12 |
| 2011 | 656,277 | 62.4% | 12 of 12 |
| 2012 | 585,299 | 55.5% | 12 of 12 |
| 2013 | 678,089 | 64.5% | 12 of 12 |
| 2014 | 578,930 | 55.1% | 12 of 12 |
| 2015 | 611,222 | Not reported | 12 of 12 |
| 2016 | 609,027 | 53.3% | 12 of 12 |
| 2017 | 557,413 | 48.9% | 12 of 12 |
| 2018 | 664,449 | 58.3% | 12 of 12 |
| 2019 | 714,853 | 62.8% | 12 of 12 |
| 2020 | 725,176 | 63.5% | 12 of 12 |
| 2021 | 702,029 | 61.6% | 12 of 12 |
| 2022 | 663,943 | 58.3% | 12 of 12 |
| 2023 | 685,724 | 60.2% | 12 of 12 |
| 2024 | 660,905 | 57.9% | 12 of 12 |
| 2025 | 641,838 | 56.4% | 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 accountNo verified ISO price node is linked to this plant, or its price history could not load.
Emissions
Free · EPA CAMPDCO₂, 2025
782,853
US short tons. 2024: 869,770
SO₂, 2025
357
US short tons
NOx, 2025
563
US short tons
CO₂ per MWh, calculated
1.22 t
About 2,439 lb per MWh
2 of 2 EPA units reported CO₂ in 2025 (1, CT1), matched to EIA plant 7504 through the EPA–EIA crosswalk. The per-MWh rate is EPA CO₂ divided by EIA-923 net generation. The two reporting boundaries can differ.
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 |
|---|---|---|---|
| 2 | Conventional Steam Coal | 90.0 | September 1995 |
| GT1 | Natural Gas Fired Combustion Turbine | 40.0 | June 2000 |
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 Black Hills 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 Neil Simpson II
More plants operated by Black Hills Power, Inc.
Questions about Neil Simpson II
How much power does Neil Simpson II produce?
Neil Simpson II reported 641,838 MWh (642 GWh) of net generation in 2025, a 56.4% capacity factor on 130 MW of nameplate capacity.
Where is Neil Simpson II?
Neil Simpson II is in Campbell County, Wyoming, at 44.2856, −105.3833. It is in the Western Area Power Administration - Rocky Mountain Region balancing area (WACM).
Who operates Neil Simpson II?
EIA-860M for August 2026 lists Black Hills Power, Inc. as the operator (EIA operator ID 19545). The operator is not always the owner.
Is Neil Simpson II a coal or a natural gas plant?
Both. Coal capacity totals 90 MW and natural gas capacity totals 40 MW.
When did Neil Simpson II start operating?
Its first generator began operating in September 1995, according to EIA-860M.
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
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page