States › Washington › Avista Corp
investor-owned utility · EIA utility 20169
Avista Corp
Average price is revenue divided by sales for the sector and year; it is not a tariff rate. Reliability figures are as reported by utilities to EIA on Form 861 and may use different calculation methods. Annual figures: Form EIA-861 for 2024, final release. Monthly state figures run to July 2026.
In its Form EIA-861 filing for 2024, Avista Corp, an investor-owned utility, reported 374,290 residential customers in Washington and 2 other states, with a service territory that touches 19 counties.
Its average residential price that year was 11.78¢ per kilowatthour, about the same as the Washington average of 11.90¢ and 29% below the US average of 16.48¢. The figure is residential revenue divided by residential sales, so it folds in fixed charges, riders and every rate schedule the utility bills under.
That works out to an average residential bill of $105.41 a month on average use of 894 kWh a month. Across Washington the average bill was $113.68 on 955 kWh, so a bill gap reflects how much power households use as well as what each kilowatthour costs.
For reliability it reported a SAIDI of 177.5 minutes per customer with major event days included and 130.5 minutes with them excluded, calculated under IEEE 1366 standard. The median among Washington utilities reporting was 255.4 minutes with major event days; this utility's figure is 31% below that median.
The average price is up 20.2% on 2019, against up 22.6% for Washington as a whole, and up 11.3% on 2023.
Compared with Washington, the US and other investor-owned utilities
| Measure, 2024 | This utility | Investor-owned utilities, US median | Washington | United States |
|---|---|---|---|---|
| Average residential price per kWh | 11.78¢ | 16.17¢ | 11.90¢ | 16.48¢ |
| Average monthly residential bill | $105.41 | $131.47 | $113.68 | $142.26 |
| Average monthly use, kWh | 894 | 787 | 955 | 863 |
| Residential price change, 1 year | +11.3% | — | +8.4% | +3.0% |
| Residential price change, 5 years | +20.2% | — | +22.6% | +26.7% |
| SAIDI, all events (minutes) | 177.5 | 278.7 | 255.4 median | 184.5 median |
| SAIDI, without major event days | 130.5 | 106.5 | 136.1 median | 99.8 median |
State and US prices, bills and use are EIA's own averages over every customer. The ownership column and the reliability columns are medians across utilities with at least 1,000 residential customers, computed on this site from the final 2024 file. Among the 3 filings by investor-owned utilities in Washington, the median price was 11.87¢. In Washington this utility's price ranks 9 of 36, counting from the highest.
Average price by year
Avista CorpWashington averageUS average
Year by year
| Year | ¢ per kWh | Washington ¢ | Monthly bill | kWh a month | Residential customers | All sales |
|---|---|---|---|---|---|---|
| 2024 | 11.78¢ | 11.90¢ | $105.41 | 894 | 374,290 | 9.4 TWh |
| 2023 | 10.58¢ | 10.98¢ | $95.76 | 905 | 370,081 | 9.3 TWh |
| 2022 | 9.99¢ | 10.26¢ | $94.99 | 951 | 363,932 | 9.5 TWh |
| 2021 | 9.98¢ | 10.11¢ | $91.51 | 917 | 359,452 | 9.2 TWh |
| 2020 | 9.88¢ | 9.87¢ | $89.38 | 905 | 350,669 | 8.9 TWh |
| 2019 | 9.80¢ | 9.71¢ | $88.36 | 902 | 348,111 | 9 TWh |
| 2018 | 10.17¢ | 9.75¢ | $89.59 | 881 | 342,996 | 8.6 TWh |
| 2017 | 9.94¢ | 9.66¢ | $94.10 | 947 | 337,941 | 8.9 TWh |
| 2016 | 9.62¢ | 9.48¢ | $84.80 | 882 | 333,346 | 8.5 TWh |
| 2015 | 9.40¢ | 9.09¢ | $84.54 | 900 | 330,747 | 8.6 TWh |
| 2014 | 9.17¢ | 8.67¢ | $87.06 | 949 | 324,188 | 8.8 TWh |
| 2013 | 8.86¢ | 8.70¢ | $86.13 | 972 | 321,098 | 8.9 TWh |
Bundled residential service only in the price, bill and use columns. Bill = residential revenue ÷ customers ÷ 12; use = residential sales ÷ customers ÷ 12.
Month by month
Avista Corp (WA)Washington average
Sales by sector, 2024
| Sector | Customers | Sales | Share of sales | Revenue | ¢ per kWh, bundled |
|---|---|---|---|---|---|
| Residential | 374,290 | 4 TWh | 43% | $473,446,000 | 11.78¢ |
| Commercial | 46,713 | 3.2 TWh | 34% | $379,847,000 | 11.87¢ |
| Industrial | 1,164 | 2.2 TWh | 23% | $145,880,000 | 6.64¢ |
Customers, sales and revenue count every service type the utility reported (bundled, energy-only and delivery-only). The price column uses bundled service alone, because part-bill revenue would understate it. Sources of energy: 13.6 TWh in total, of which 60.1% was its own net generation and 5.4 TWh was bought wholesale; summer peak demand 1,831 MW.
By state
| State | Residential customers | ¢ per kWh | State average ¢ | Monthly bill | SAIDI, all events |
|---|---|---|---|---|---|
| Washington | 246,055 | 11.87¢ | 11.90¢ | $106.95 | 152.0 |
| Idaho | 128,226 | 11.62¢ | 11.52¢ | $102.46 | 225.0 |
| Montana | 9 | — | 12.66¢ | — | — |
Reliability
Minutes of sustained interruption per customer in 2024, as the utility reported them under IEEE 1366 standard. SAIFI: 1.06 interruptions per customer with major event days, 0.90 without; CAIDI 166.7 minutes per interruption. EIA's Washington total across all reporting utilities was 623.5 minutes with major event days and 158.6 without. Major event days are storms and similar events that a utility's chosen method sets apart; methods differ, so treat comparisons as approximate. What SAIDI and SAIFI mean.
| Year | SAIDI, all events | SAIDI, no major events | SAIFI, all events | SAIFI, no major events | Method |
|---|---|---|---|---|---|
| 2024 | 177.5 | 130.5 | 1.06 | 0.90 | IEEE 1366 |
| 2023 | 139.1 | 113.5 | 0.86 | 0.79 | IEEE 1366 |
| 2022 | 203.9 | 146.2 | 1.10 | 0.92 | IEEE 1366 |
| 2021 | 831.4 | 164.4 | 2.09 | 1.24 | IEEE 1366 |
| 2020 | 285.7 | 131.5 | 1.54 | 0.89 | IEEE 1366 |
| 2019 | 209.7 | 136.8 | 1.14 | 0.94 | IEEE 1366 |
| 2018 | 151.6 | 126.3 | 0.87 | 0.81 | IEEE 1366 |
| 2017 | 201.1 | 183.2 | 1.25 | 1.14 | IEEE 1366 |
| 2016 | 132.1 | 132.1 | 0.86 | 0.86 | IEEE 1366 |
Generation at plants it operates, 2025
- Hydro 48.7% 3.2 TWh
- Natural gas 46.9% 3.1 TWh
- Other 4.4% 286.8 GWh
Net generation of 6.6 TWh at power plants this utility operates, from Form EIA-923. It is not the mix delivered to customers: utilities also buy power wholesale (5.4 TWh in 2024), sell generation to others and may co-own plants that another company operates.
Counties in its service territory
- Benewah County ID
- Bonner County ID
- Clearwater County ID
- Idaho County ID
- Kootenai County ID
- Latah County ID
- Lewis County ID
- Nez Perce County ID
- Shoshone County ID
- Sanders County MT
- Adams County WA
- Asotin County WA
- Ferry County WA
- Grant County WA
- Lincoln County WA
- Pend Oreille County WA
- Spokane County WA
- Stevens County WA
- Whitman County WA
Counties the utility listed on Form EIA-861 for 2024. Listing a county does not mean the utility serves all of it.
Other utilities in Washington
| Utility | Ownership | Residential customers | ¢ per kWh | Monthly bill | SAIDI, all events | SAIDI, no major events |
|---|---|---|---|---|---|---|
| Puget Sound Energy Inc | Investor-owned | 1,091,599 | 14.63¢ | $128.07 | 1,196.0 | 203.0 |
| PUD No 1 of Snohomish County | Public power district | 346,532 | 11.51¢ | $108.89 | 620.9 | 181.4 |
| City of Seattle | Municipal | 459,964 | 14.09¢ | $84.68 | 323.6 | 110.8 |
| PUD No 1 of Clark County | Public power district | 219,477 | 10.41¢ | $104.88 | 144.8 | 59.0 |
| City of Tacoma | Municipal | 180,357 | 10.81¢ | $98.06 | 170.8 | 80.5 |
| PUD No 1 of Benton County | Public power district | 50,072 | 8.81¢ | $107.50 | 52.9 | 39.5 |
| PUD No 1 of Cowlitz County | Public power district | 48,267 | 8.80¢ | $116.71 | 262.9 | 125.6 |
| Inland Power & Light Company | Cooperative | 43,799 | 8.97¢ | $128.42 | 386.0 | 278.0 |
All Washington utilities · Investor-owned utilities nationwide
Questions and answers
How much does electricity cost from Avista Corp?
Residential customers paid an average of 11.78¢ per kilowatthour in 2024. EIA derives this by dividing residential revenue by residential sales; it is an average across all rate schedules and charges, not a tariff rate.
How does that compare with Washington?
The Washington average residential price in 2024 was 11.90¢ and the US average 16.48¢; Avista Corp was about the same as the state figure. Among 36 utility filings with a bundled residential price in Washington, it had the 9th highest.
What is the average Avista Corp bill?
$105.41 a month in 2024, on average residential use of 894 kWh a month (annual revenue and sales divided by customers and by twelve). The Washington average was $113.68 on 955 kWh.
How reliable is Avista Corp service?
It reported 177.5 minutes of interruption per customer (SAIDI) including major event days and 130.5 minutes excluding them, with 1.06 interruptions per customer (SAIFI) in 2024. Utilities calculate these under differing methods, so comparisons are approximate.
Is the Avista Corp price rising?
The average residential price was up 11.3% in 2024 compared with 2023 and up 20.2% compared with 2019.
Which counties does Avista Corp serve?
Its Form EIA-861 service territory lists 19 counties, including Benewah County, ID, Bonner County, ID, Clearwater County, ID, Idaho County, ID, Kootenai County, ID and Latah County, ID. A county can appear in several utilities' territories.
Provenance
Source: U.S. Energy Information Administration. Annual figures are from Form EIA-861 (sales to ultimate customers, reliability, operational data and service territory files), final release for 2024, respondent "Avista Corp", utility number 20169. Monthly utility figures are from the Form EIA-861M sample. State and US averages are from the Form EIA-861M sales and revenue workbook, published through July 2026. Generation by fuel is from Form EIA-923, 2025 final. All are US government works in the public domain. Page built 1 Oct 2026. Errors in processing are corrected at the next build; see corrections. For tariffs and rate schedules, consult the utility or the state utility commission.