Idaho power plants

Figures

Records

Idaho power plants

One row per operating power plant in Idaho per year, from Form EIA-860's plant and generator files.

An excerpt; the full table is below.

Source: U.S. Energy Information Administration, Form EIA-860, Annual Electric Generator Report, Idaho power plants. Published September 2026.

Pages built on this dataset

• Idaho power plants

Publisher

Organization

U.S. Energy Information Administration

Publisher’s dataset

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

File or API used

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

Methodology

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

Coverage

Geography

Idaho

Time coverage

2013-2025

Update frequency

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

Published

September 2026

Retrieved

October 12, 2026

License of the records

Public domain. U.S. federal government work.

Rows

125 observations, 1,739 records, 2013-2025

Measures

Record fields

One row per operating power plant in Idaho per year, from Form EIA-860's plant and generator files.

• year: Data year of the EIA-860 final release.
• plant_id: EIA plant code.
• plant: Plant name as printed on Form EIA-860.
• operator: Utility Name as printed on Form EIA-860; the form's respondent, not necessarily the owner.
• sector: "Electric utility", "Independent power producer" or "Commercial or Industrial", mapped from Form EIA-860's own Sector Name.
• county: County as printed on Form EIA-860.
• source: The plant's largest-capacity source category among its own operable generators that year.
• nameplate_mw: Sum of Nameplate Capacity (MW) over the plant's generators with Status OP.
• first_operating_year: Minimum Operating Year among those generators.

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.
• Nameplate capacity by source is a category-level sum across every operating generator's own technology or energy source, which can split a multi-technology plant across two categories; a plant's own nameplate capacity elsewhere in this dataset covers only its single largest category, so the two do not always add up to the same plant total.
• 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.

How to cite

Understand Idaho, “Form EIA-860, Annual Electric Generator Report, Idaho power plants”, compiled from U.S. Energy Information Administration, Form EIA-860, Annual Electric Generator Report, Idaho power plants. Retrieved October 12, 2026. https://understandidaho.com/data/eia-plants-idaho/.

Cite U.S. Energy Information Administration directly for the figures themselves.