Idaho Power power supply by source
20,395 GWh
Energy Idaho Power supplied from its own generation and purchases, 2025
+1.7% since 2024 (20,061 GWh); +14.1% since 2020 (17,867 GWh); +24.0% since 2015 (16,454 GWh)
Source: IDACORP, Inc. and Idaho Power Company, Form 10-K, Power Supply table. Data period 2025. Published . Newest release as of ; next expected by February 2027.
Idaho Power's total system generation plus purchased power in the calendar year, thousands of megawatt-hours stored as gigawatt-hours.
Comparison
The latest figure, 2025, is the highest in the series, which begins in 2007.
The largest category in supply by source is Hydropower plants at 7,021 GWh; next is Purchased power at 6,783 GWh.
Historical data
Source: IDACORP, Form 10-K, Power Supply table.
Data table (19 rows)
| Period | Idaho (gigawatt-hours) |
|---|---|
| 2007 | 18,744 |
| 2008 | 18,121 |
| 2009 | 18,191 |
| 2010 | 16,769 |
| 2011 | 18,646 |
| 2012 | 17,529 |
| 2013 | 17,461 |
| 2014 | 17,349 |
| 2015 | 16,454 |
| 2016 | 16,512 |
| 2017 | 17,930 |
| 2018 | 18,795 |
| 2019 | 18,620 |
| 2020 | 17,867 |
| 2021 | 17,951 |
| 2022 | 18,501 |
| 2023 | 18,965 |
| 2024 | 20,061 |
| 2025 | 20,395 |
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.
Share of supply
- Hydropower plants: 34%
- Purchased power: 33%
- Natural gas-fired plants: 18%
- Jointly-owned thermal plants: 14%
Source: IDACORP, Form 10-K, Power Supply table.
Data table (4 rows)
| Source | 2025 (gwh) | Share of total |
|---|---|---|
| Hydropower plants | 7,021 | 34.4% |
| Purchased power | 6,783 | 33.3% |
| Natural gas-fired plants | 3,685 | 18.1% |
| Jointly-owned thermal plants | 2,906 | 14.2% |
Supply by source over time
- Jointly-owned thermal plants
- Natural gas-fired plants
- Purchased power
- Hydropower plants
Source: IDACORP, Form 10-K, Power Supply table.
Data table (28 rows)
| Period | Hydropower plants (gigawatt-hours) | Purchased power (gigawatt-hours) | Natural gas-fired plants (gigawatt-hours) | Jointly-owned thermal plants (gigawatt-hours) |
|---|---|---|---|---|
| 1998 | 11,135 | 0 | 0 | 0 |
| 1999 | 10,652 | 0 | 0 | 0 |
| 2000 | 8,500 | 0 | 0 | 0 |
| 2001 | 5,638 | 0 | 0 | 0 |
| 2002 | 6,069 | 0 | 0 | 0 |
| 2003 | 6,149 | 0 | 0 | 0 |
| 2004 | 6,041 | 0 | 0 | 0 |
| 2005 | 6,199 | 0 | 0 | 0 |
| 2006 | 9,207 | 0 | 0 | 0 |
| 2007 | 6,181 | 5,196 | 223 | 7,144 |
| 2008 | 6,908 | 3,717 | 217 | 7,279 |
| 2009 | 8,096 | 2,912 | 242 | 6,941 |
| 2010 | 7,344 | 2,401 | 160 | 6,864 |
| 2011 | 10,937 | 2,751 | 138 | 4,820 |
| 2012 | 7,956 | 3,670 | 676 | 5,227 |
| 2013 | 5,656 | 3,902 | 1,576 | 6,327 |
| 2014 | 6,170 | 4,153 | 1,175 | 5,851 |
| 2015 | 5,910 | 3,792 | 2,076 | 4,676 |
| 2016 | 6,408 | 4,337 | 1,722 | 4,045 |
| 2017 | 8,900 | 4,242 | 1,504 | 3,284 |
| 2018 | 8,682 | 5,431 | 1,408 | 3,274 |
| 2019 | 8,294 | 5,200 | 2,114 | 3,012 |
| 2020 | 6,967 | 5,072 | 2,109 | 3,719 |
| 2021 | 5,382 | 6,823 | 2,765 | 2,981 |
| 2022 | 5,347 | 7,178 | 2,319 | 3,657 |
| 2023 | 6,548 | 7,027 | 2,917 | 2,473 |
| 2024 | 7,203 | 6,541 | 3,843 | 2,474 |
| 2025 | 7,021 | 6,783 | 3,685 | 2,906 |
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
Source: IDACORP, Form 10-K, Power Supply table.
Data table (3 rows)
| Source | 2025 (percent) |
|---|---|
| Hydropower plants | 52.0% |
| Natural gas-fired plants | 27.0% |
| Jointly-owned thermal plants | 21.0% |
Generation share by source over time
Source: IDACORP, Form 10-K, Power Supply table.
Generation at Idaho Power's own plants
13,612 GWh in 2025. 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.
Source: IDACORP, Form 10-K, Power Supply table.
Data table (28 rows)
| Period | Idaho Power total system generation (gigawatt-hours) |
|---|---|
| 1998 | 18,060 |
| 1999 | 17,918 |
| 2000 | 16,201 |
| 2001 | 13,260 |
| 2002 | 13,355 |
| 2003 | 13,063 |
| 2004 | 13,344 |
| 2005 | 13,514 |
| 2006 | 16,228 |
| 2007 | 13,548 |
| 2008 | 14,404 |
| 2009 | 15,279 |
| 2010 | 14,368 |
| 2011 | 15,895 |
| 2012 | 13,859 |
| 2013 | 13,559 |
| 2014 | 13,196 |
| 2015 | 12,662 |
| 2016 | 12,175 |
| 2017 | 13,688 |
| 2018 | 13,364 |
| 2019 | 13,420 |
| 2020 | 12,795 |
| 2021 | 11,128 |
| 2022 | 11,323 |
| 2023 | 11,938 |
| 2024 | 13,520 |
| 2025 | 13,612 |
Source
- Organization
- IDACORP, Inc. and Idaho Power Company
- Dataset
- Form 10-K, Power Supply table
- 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
- Newest release as of
- ; next expected by February 2027
- Original file
- https://data.sec.gov/submissions/CIK0001057877.json
- Methodology
- https://www.sec.gov/Archives/edgar/data/1057877/000105787726000028/ida-20251231.htm
- License
- Public record. SEC filing by a registrant; the figures are the registrant's.
- Our copy
- Form 10-K, Power Supply table
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 years 2007 to 2022 the 10-K splits it into cogeneration and small power production (contracts under the Public Utility Regulatory Policies Act, mostly Idaho wind, solar, geothermal and biomass) and other purchases; that split appears in the report's own text but is not stored here as a separate figure.
- 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 year 2023 10-K, Steam-fired plants in fiscal year 2024 and Jointly-owned thermal plants in fiscal year 2025 as Bridger units were converted to natural gas; the series carries the current label. For fiscal years 1998 to 2006 the 10-K combined these plants with the gas plants as Thermal, kept as its own category for those years; the fiscal year 2009 filing supplies the coal and gas split back to 2007.
- Total power supply and purchased power are printed from fiscal year 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.
Cite as Understand Idaho, “Idaho Power power supply by source”, https://understandidaho.com/energy/idaho-power-supply/; cite the publisher above for the figures. See the data catalog.
This page was last updated .