West River Electric Assn Inc
Cooperative electric utility · South Dakota · #697 of 3,199 U.S. utilities by customers · EIA utility #20401
West River Electric Assn Inc is a cooperative electric utility serving 21,332 customers in South Dakota. In 2025 it sold 349 gigawatt-hours of electricity for $49.51M in revenue, an average realized rate of 14.20¢ per kWh across all customer classes and 15.16¢ per kWh for residential customers. Its reported service territory covers 6 counties. EIA records its activities as: transmission, distribution.
Customers, sales and rates by customer class (2025)
| Class | Customers | Sales (GWh) | Revenue | Avg realized rate | Share of sales |
|---|---|---|---|---|---|
| Residential | 18,975 | 204 | $30.92M | 15.16¢ | |
| Commercial | 2,335 | 105 | $14.34M | 13.64¢ | |
| Industrial | 22 | 39.5 | $4.25M | 10.76¢ | |
| Total | 21,332 | 349 | $49.51M | 14.20¢ |
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 (896 kWh/month).
Five-year trend
| Year | Customers | Sales (GWh) | Revenue | Residential rate |
|---|---|---|---|---|
| 2021 | 18,789 | 308 | $37.45M | 12.69¢ |
| 2022 | 19,357 | 329 | $41.87M | 13.21¢ |
| 2023 | 20,260 | 329 | $42.33M | 13.40¢ |
| 2024 | 20,674 | 337 | $45.42M | 14.25¢ |
| 2025 | 21,332 | 349 | $49.51M | 15.16¢ |
Reliability (2025)
Average outage time (SAIDI): 24 minutes per customer per year
Average outages (SAIFI): 0.30 per customer
Average restoration time (CAIDI): 80 minutes
As reported for South Dakota 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: — GWh
Wholesale power purchased: 367 GWh
Winter peak demand: 79 MW
Energy losses: 4.8% of energy handled
Meters & rooftop solar (2025)
Smart (AMI) meters: 100.0% of 21,332 meters
Customer-sited generation (net metering): 214 installations, 1.6 MW of capacity
Counties served
Haakon, SDJackson, SDMeade, SDOglala Lakota, SDPennington, SDZiebach, SD
Other large utilities in South Dakota
- Black Hills Power, Inc. - 85,804 customers, residential 15.07¢
- NorthWestern Energy - (SD) - 65,396 customers, residential 13.35¢
- Sioux Valley SW Elec Coop - 30,059 customers, residential 13.87¢
- Southeastern Electric Coop Inc - (SD) - 24,428 customers, residential 12.98¢
- Watertown Municipal Utilities - 14,497 customers, residential 9.29¢
- City of Brookings - (SD) - 12,568 customers, residential 10.69¢
- Black Hills Electric Coop, Inc - 11,478 customers, residential 14.79¢
- Butte Electric Coop, Inc - 7,472 customers, residential —
All South Dakota utilities and rates
Source: U.S. Energy Information Administration, Form EIA-861 2025 (filed by the utility; figures as published). Utility #20401 in the EIA frame.