Gem State
Hydro power plant in Bonneville County, Idaho. 23.4 MW of nameplate capacity across 1 generator, operated by City of Idaho Falls - (ID).
Also known as EIA plant 790
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 23.4 MWNameplate
- Generators
- 1 operatingEIA-860M, August 2026
- Operating since
- November 1988First generator online
- Operator
- City of Idaho Falls - (ID)EIA operator ID 9187
- Grid
- PACEBalancing authority PACE
- Price nodes
- None linkedNo verified ISO node
- Location
- Bonneville County, ID43.4202, −112.1019
- EIA plant ID
- 790EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Gem State produces
Free · EIA-923Net generation, 2025
117 GWh
117,220 MWh, final
Capacity factor, 2025
57.2%
2024: 52.8%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
78.5–147.5
GWh a year. Low 2020, high 2017
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 0 | Not reported | 12 of 12 |
| 2001 | 88,710 | Not reported | 12 of 12 |
| 2002 | 35,879 | Not reported | 12 of 12 |
| 2003 | 101,786 | Not reported | 12 of 12 |
| 2004 | 88,586 | Not reported | 12 of 12 |
| 2005 | 98,391 | Not reported | 12 of 12 |
| 2006 | 127,143 | Not reported | 12 of 12 |
| 2007 | 110,135 | Not reported | 12 of 12 |
| 2008 | 120,378 | Not reported | 12 of 12 |
| 2009 | 118,731 | Not reported | 12 of 12 |
| 2010 | 108,210 | 52.8% | 12 of 12 |
| 2011 | 123,970 | 60.5% | 12 of 12 |
| 2012 | 167,068 | 81.3% | 12 of 12 |
| 2013 | 113,833 | 55.5% | 12 of 12 |
| 2014 | 123,525 | 60.3% | 12 of 12 |
| 2015 | 117,470 | 57.3% | 12 of 12 |
| 2016 | 116,563 | 56.7% | 12 of 12 |
| 2017 | 147,468 | 71.9% | 12 of 12 |
| 2018 | 144,613 | 70.5% | 12 of 12 |
| 2019 | 130,683 | 63.8% | 12 of 12 |
| 2020 | 78,479 | 38.2% | 12 of 12 |
| 2021 | 110,764 | 54.0% | 12 of 12 |
| 2022 | 101,546 | 49.5% | 12 of 12 |
| 2023 | 104,112 | 50.8% | 12 of 12 |
| 2024 | 108,516 | 52.8% | 12 of 12 |
| 2025 | 117,220 | 57.2% | 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 CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024. Plants without steam cooling, such as wind, solar and batteries, do not report cooling water.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| 1 | Conventional Hydroelectric | 23.4 | November 1988 |
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 City of Idaho Falls - (ID) as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
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Power plants near Gem State
More plants operated by City of Idaho Falls - (ID)
Questions about Gem State
How much power does Gem State produce?
Gem State reported 117,220 MWh (117 GWh) of net generation in 2025, a 57.2% capacity factor on 23.4 MW of nameplate capacity.
Where is Gem State?
Gem State is in Bonneville County, Idaho, at 43.4202, −112.1019. It is in the PacifiCorp - East balancing area (PACE).
Who operates Gem State?
EIA-860M for August 2026 lists City of Idaho Falls - (ID) as the operator (EIA operator ID 9187). The operator is not always the owner.
When did Gem State start operating?
Its first generator began operating in November 1988, 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)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page