Avista Corp
Investor Owned electric utility · Washington · #97 of 3,199 U.S. utilities by customers · EIA utility #20169
Avista Corp is a investor owned electric utility serving 424,411 customers in Idaho, Montana, Washington. In 2025 it sold 9,757 gigawatt-hours of electricity for $1.12B in revenue, an average realized rate of 11.52¢ per kWh across all customer classes and 13.37¢ per kWh for residential customers. Its reported service territory covers 19 counties. EIA records its activities as: generation, transmission, buying transmission, distribution, wholesale marketing, bundled.
Customers, sales and rates by customer class (2025)
| Class | Customers | Sales (GWh) | Revenue | Avg realized rate | Share of sales |
|---|---|---|---|---|---|
| Residential | 376,350 | 4,114 | $550.17M | 13.37¢ | |
| Commercial | 46,902 | 3,248 | $414.07M | 12.75¢ | |
| Industrial | 1,159 | 2,395 | $159.47M | 6.66¢ | |
| Total | 424,411 | 9,757 | $1.12B | 11.52¢ |
Average realized rate = revenue divided by sales as reported on EIA Form 861. It blends fixed charges, demand charges and riders into one per-kWh figure; it is not the utility's tariff rate. Estimated residential bill assumes the average residential customer's actual 2025 usage (911 kWh/month).
Operations by state
| State | Customers | Sales (GWh) | Residential rate |
|---|---|---|---|
| Washington | 275,281 | 6,107 | 14.16¢ |
| Idaho | 149,098 | 3,649 | 11.84¢ |
| Montana | 32 | 1.1 | 8.67¢ |
Five-year trend
| Year | Customers | Sales (GWh) | Revenue | Residential rate |
|---|---|---|---|---|
| 2021 | 404,895 | 9,235 | $846.99M | 9.98¢ |
| 2022 | 410,798 | 9,518 | $880.88M | 9.99¢ |
| 2023 | 416,479 | 9,308 | $898.49M | 10.58¢ |
| 2024 | 422,167 | 9,413 | $999.17M | 11.78¢ |
| 2025 | 424,411 | 9,757 | $1.12B | 13.37¢ |
Reliability (2025)
Average outage time (SAIDI): 200 minutes per customer per year
Average outages (SAIFI): 0.97 per customer
Average restoration time (CAIDI): 206 minutes
As reported for Washington under the IEEE standard, with major event days included where the standard reports them. Lower is better; see the reliability rankings.
Energy supply (2025)
Net generation: 8,010 GWh
Wholesale power purchased: 6,620 GWh
Winter peak demand: 1,832 MW
Energy losses: 3.0% of energy handled
Meters & rooftop solar (2025)
Smart (AMI) meters: 64.7% of 404,848 meters
Customer-sited generation (net metering): 6,140 installations, 46.0 MW of capacity
Counties served
Adams, WAAsotin, WABenewah, IDBonner, IDClearwater, IDFerry, WAGrant, WAIdaho, IDKootenai, IDLatah, IDLewis, IDLincoln, WANez Perce, IDPend Oreille, WASanders, MTShoshone, IDSpokane, WAStevens, WAWhitman, WA
Other large utilities in Washington
- Puget Sound Energy Inc - 1,251,330 customers, residential 17.01¢
- City of Seattle - (WA) - 525,040 customers, residential 14.74¢
- PUD No 1 of Snohomish County - (WA) - 385,159 customers, residential 12.08¢
- PUD No 1 of Clark County - (WA) - 243,809 customers, residential 10.63¢
- City of Tacoma - (WA) - 200,438 customers, residential 11.45¢
- PUD No 1 of Benton County - 58,679 customers, residential 9.13¢
- PUD No 2 of Grant County - (WA) - 56,753 customers, residential 6.17¢
- PUD No 1 of Cowlitz County - 54,269 customers, residential 9.23¢
All Washington utilities and rates
Source: U.S. Energy Information Administration, Form EIA-861 2025 (filed by the utility; figures as published). Utility #20169 in the EIA frame.