Idaho hydroelectric plants

Figures

Records

Idaho hydroelectric plants

One row per operating hydroelectric 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, Forms EIA-860 and EIA-923, Idaho hydroelectric plants. Published September 18, 2025.

Pages built on this dataset

• Idaho hydropower generation

Publisher

Organization

U.S. Energy Information Administration

Publisher’s dataset

Forms EIA-860 and EIA-923, Idaho hydroelectric 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

2014-2025

Update frequency

Annual; the final EIA-860 and EIA-923 files for a year post the following September

Published

September 18, 2025

Retrieved

October 12, 2026

License of the records

Public domain. U.S. federal government work.

Rows

72 observations, 863 records, 2014-2025

Measures

Record fields

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

• year: Data year of the EIA-860 and EIA-923 final releases.
• 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" or "Independent power producer", mapped from Form EIA-860's own Sector Name ("Electric Utility" or "IPP Non-CHP").
• county: County as printed on Form EIA-860.
• nameplate_mw: Sum of Nameplate Capacity (MW) over the plant's generators with Energy Source 1 WAT and Status OP, SB, OS or OA.
• first_operating_year: Minimum Operating Year among those generators.
• net_generation_mwh: Sum of Form EIA-923 Net Generation (Megawatthours) over the plant's own rows with Reported Fuel Type Code WAT; left blank, never shown as zero, when the plant has no such row.

Caveats

• Form EIA-860 lists only plants of 1 megawatt of nameplate capacity or larger, so micro-hydro is absent.
• 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 either form.
• A generator on standby (Form EIA-860 Status "SB") does not qualify its plant for this dataset even if Form EIA-923 later reports generation for it in the year; Little Wood Hydro Project (plant 54386, Blaine County) is the 2024 example, reporting 4,751 megawatt-hours on standby status.
• Two plants in the 2024 and 2025 lists have no matching Form EIA-923 generation row, so their net generation is left blank rather than shown as zero: El Dorado Hydro Elk Creek and Rock Creek II, both operated by Hydroland Omega LLC.
• The generation-by-owner-type figures are not a re-sum of this dataset's per-plant rows. They total every Idaho, water-fuel row in Form EIA-923, including generation Form EIA-923 attributes to plants EIA-860 does not list as operating that year and to EIA's own unattributed state-level residual, because that is what EIA's own published Idaho hydroelectric generation total (the Hydroelectric Conventional line of its net generation by state) is built from.
• A plant is in the dataset when at least one of its hydroelectric generators is marked operating (Status OP). Its nameplate capacity and first operating year then cover all of its hydroelectric generators EIA counts as operable, including units on standby or out of service at year end (Status SB, OS, OA), because Form EIA-923 credits their generation to the plant; a plant's other generators (a diesel backup unit, for example) are not counted.
• History runs 2014 to 2025; 2013 and earlier use a differently structured Form EIA-923 file this dataset does not read.

How to cite

Understand Idaho, “Forms EIA-860 and EIA-923, Idaho hydroelectric plants”, compiled from U.S. Energy Information Administration, Forms EIA-860 and EIA-923, Idaho hydroelectric plants. Retrieved October 12, 2026. https://understandidaho.com/data/eia-hydro-plants-idaho/.

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