Idaho power plants

Organization

U.S. Energy Information Administration

Dataset

Form EIA-860, Annual Electric Generator Report, Idaho power plants

Geography

Idaho

Time coverage

2013-2025

Update frequency

Annual; the final EIA-860 file for a year posts the following September

Published

September 2026

Original file

https://www.eia.gov/electricity/data/eia860/xls/eia8602025.zip

Methodology

https://www.eia.gov/electricity/data/eia860/pdf/instructions.pdf

License

Public domain. U.S. federal government work.

Our copy

Form EIA-860, Annual Electric Generator Report, Idaho power plants

Caveats

• A plant's source is its single largest-capacity technology category among its own operable generators that year; a multi-technology plant (a solar-plus-storage project) is filed under whichever category has more nameplate megawatts, ties broken alphabetically.
• The operator named here is the Form EIA-860 respondent (the utility or company that reports the plant), not necessarily its owner; joint or non-operator ownership is not resolved here. A separate dataset on this site covers out-of-state plants an Idaho-based owner holds a share of.
• Which utility or market buys an independent power producer's output is not recorded in the form.
• Ten short source categories cover every Technology or Energy Source 1 value Idaho's plants have carried in this span: Hydroelectric, Natural gas, Wind, Solar, Battery storage, Geothermal, Biomass, Coal, Petroleum, Other. Landfill gas, black liquor, wood waste and other biomass gas are grouped as Biomass; distillate fuel oil and other liquid fuels as Petroleum.
• Capacity counts generators on standby or out of service as well as operating ones, as EIA's state capacity does; before 2026-10-12 this site counted only generators operating at year end, which put the total up to 367 MW lower (2017). The plant list includes a plant only when one of its generators is operating, so a plant whose every unit stood idle at year end (Little Wood Hydro Project in 2024) counts in capacity but is not listed.
• Idaho's battery storage generators are reported by Form EIA-860 in both its Generator schedule and again, as the same plants and the same capacity, in its separate Energy Storage schedule; only the first is read here, so a battery plant is not double-counted.
• Idaho has never had an operating or currently proposed nuclear generator; the one nuclear project Form EIA-860 has carried for Idaho (UAMPS Carbon Free Power Plant, Idaho Falls) was cancelled before this dataset's first year and appears only in the Retired and Canceled sheet's own cancelled-project rows, which this dataset excludes.
• History runs 2013 to 2025; 2012 and earlier use a differently structured file this dataset does not read.
• Sector groups Form EIA-860's own six Sector Name values into three: Electric Utility to Electric utility; IPP Non-CHP and IPP CHP to Independent power producer; Commercial Non-CHP, Commercial CHP, Industrial Non-CHP and Industrial CHP to Commercial or Industrial.