Tohono O'Odham Utility Authority
Political Subdivision electric utility · Arizona · #1,690 of 3,199 U.S. utilities by customers · EIA utility #14543
Tohono O'Odham Utility Authority is a political subdivision electric utility serving 4,047 customers in Arizona. In 2025 it sold 90.2 gigawatt-hours of electricity for $12.12M in revenue, an average realized rate of 13.44¢ per kWh across all customer classes and — per kWh for residential customers. Its reported service territory covers 3 counties.
Customers, sales and rates by customer class (2025)
| Class | Customers | Sales (GWh) | Revenue | Avg realized rate | Share of sales |
|---|---|---|---|---|---|
| Total | 4,047 | 90.2 | $12.12M | 13.44¢ |
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 (— kWh/month).
This utility files the EIA-861S short form, which reports totals only - no breakdown by customer class is published for it.
Five-year trend
| Year | Customers | Sales (GWh) | Revenue | Residential rate |
|---|---|---|---|---|
| 2021 | 3,990 | 89.2 | $11.18M | — |
| 2022 | 4,129 | 88.1 | $13.39M | — |
| 2023 | 3,997 | 90.7 | $12.92M | — |
| 2024 | 4,020 | 92.7 | $11.61M | — |
| 2025 | 4,047 | 90.2 | $12.12M | — |
Meters & rooftop solar (2025)
Smart (AMI) meters: 71.7% of 4,363 meters
Counties served
Maricopa, AZPima, AZPinal, AZ
Other large utilities in Arizona
- Arizona Public Service Co - 1,433,294 customers, residential 17.03¢
- Salt River Project - 1,188,189 customers, residential 13.98¢
- Tucson Electric Power Co - 458,898 customers, residential 14.88¢
- UNS Electric, Inc - 107,073 customers, residential 16.99¢
- Trico Electric Cooperative Inc - 56,123 customers, residential 14.26¢
- Sulphur Springs Valley E C Inc - 54,786 customers, residential 14.61¢
- Navopache Electric Coop, Inc - 46,592 customers, residential 13.52¢
- Mohave Electric Cooperative, Inc. - 46,326 customers, residential 11.27¢
All Arizona utilities and rates
Source: U.S. Energy Information Administration, Form EIA-861 2025 (filed by the utility; figures as published). Utility #14543 in the EIA frame.