Idaho Power power supply by source
Idaho Power's own account of where its energy came from each year since 1998: generation at its hydropower plants, its share of the jointly owned coal and gas plants, its natural gas plants, and purchased power, in thousands of megawatt-hours, with the printed share of total generation for each generation row, from IDACORP's annual reports to the SEC.
Publisher
- Organization
- IDACORP, Inc. and Idaho Power Company
- Publisher’s dataset
- IDACORP, Inc. Annual Report on Form 10-K, Item 1, Power Supply table
- File or API used
- https://data.sec.gov/submissions/CIK0001057877.json
- Retrieval script
scripts/fetch-idacorp-10k-power-supply.py- Methodology
- https://www.sec.gov/Archives/edgar/data/1057877/000105787726000028/ida-20251231.htm
Coverage
- Geography
- Idaho Power's service area: southern Idaho and part of eastern Oregon, stored under Idaho
- Time coverage
- 1998-2025
- Update frequency
- Annual; the 10-K for a year is filed in February of the next
- Published
- February 19, 2026
- Retrieved
- September 9, 2026
- License of the records
- Public record. SEC filing by a registrant; the figures are the registrant's.
- Rows
- 216 observations, 1998-2025
Measures
| Measure | What it measures | Unit |
|---|---|---|
| Idaho Power power supply by source | Energy Idaho Power supplied in the calendar year from each source, as its 10-K prints it: its hydropower plants, its share of the jointly owned thermal plants, its natural gas-fired plants, and purchased power. Thousands of megawatt-hours stored as gigawatt-hours. | gwh |
| Idaho Power generation share by source | Each generation source's percent of Idaho Power's total system generation, as printed in the 10-K; purchased power is outside this total. | percent |
| Idaho Power total system generation | Energy generated at Idaho Power's own plants and its share of jointly owned plants in the calendar year, thousands of megawatt-hours stored as gigawatt-hours. | gwh |
| Idaho Power total power supply | Idaho Power's total system generation plus purchased power in the calendar year, thousands of megawatt-hours stored as gigawatt-hours. | gwh |
Caveats
- The scope is Idaho Power's system, not the State of Idaho. Idaho Power serves southern Idaho and a corner of eastern Oregon; Rocky Mountain Power's eastern Idaho customers and the cooperatives and municipal utilities of northern Idaho are not in these figures, and some of Idaho Power's supply is sold wholesale outside Idaho.
- Purchased power is not split by fuel. From fiscal 2007 to 2022 the 10-K splits it into cogeneration and small power production (PURPA contracts, mostly Idaho wind, solar, geothermal and biomass) and other purchases; that split is in the raw text and not carried as observations.
- The jointly owned plants (Jim Bridger, North Valmy, and Boardman until its 2020 retirement) are one row throughout, labelled Coal-fired plants through the fiscal 2023 10-K, Steam-fired plants in fiscal 2024 and Jointly-owned thermal plants in fiscal 2025 as Bridger units were converted to natural gas; the series carries the current label. For 1998-2006 the 10-K combined these plants with the gas plants as Thermal, kept as its own category for those years; the fiscal 2009 filing supplies the coal and gas split back to 2007.
- Total power supply and purchased power are printed from fiscal 2007. Earlier filings give system generation only.
- A year's figures are taken from that year's own filing; the two later filings that repeat the year agree with it to within one thousand megawatt-hours (2008 purchased power is 3,717 in one filing and 3,716 in the next).
- Thousands of megawatt-hours as printed are stored as gigawatt-hours; the publisher rounds to the thousand.
Pages built on this dataset
How to cite
Understand Idaho, “IDACORP, Inc. Annual Report on Form 10-K, Item 1, Power Supply table”, compiled from IDACORP, Inc. and Idaho Power Company, IDACORP, Inc. Annual Report on Form 10-K, Item 1, Power Supply table. Retrieved September 9, 2026. https://understandidaho.com/data/idacorp-10k-power-supply/.
Cite IDACORP, Inc. and Idaho Power Company directly for the figures themselves.
This page was last updated .