Southeastern Electric Coop Inc - (SD)
Cooperative electric utility · South Dakota · #626 of 3,199 U.S. utilities by customers · EIA utility #19293
Southeastern Electric Coop Inc - (SD) is a cooperative electric utility serving 24,428 customers in South Dakota. In 2025 it sold 840 gigawatt-hours of electricity for $89.76M in revenue, an average realized rate of 10.69¢ per kWh across all customer classes and 12.98¢ per kWh for residential customers. Its reported service territory covers 13 counties. EIA records its activities as: distribution.
Customers, sales and rates by customer class (2025)
| Class | Customers | Sales (GWh) | Revenue | Avg realized rate | Share of sales |
|---|---|---|---|---|---|
| Residential | 20,959 | 293 | $38.07M | 12.98¢ | |
| Commercial | 3,186 | 239 | $26.11M | 10.92¢ | |
| Industrial | 283 | 307 | $25.57M | 8.32¢ | |
| Total | 24,428 | 840 | $89.76M | 10.69¢ |
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 (1,167 kWh/month).
Five-year trend
| Year | Customers | Sales (GWh) | Revenue | Residential rate |
|---|---|---|---|---|
| 2021 | 20,258 | 708 | $68.01M | 11.45¢ |
| 2022 | 21,286 | 749 | $71.09M | 11.23¢ |
| 2023 | 22,283 | 790 | $75.25M | 11.44¢ |
| 2024 | 23,436 | 812 | $81.88M | 12.41¢ |
| 2025 | 24,428 | 840 | $89.76M | 12.98¢ |
Reliability (2025)
Average outage time (SAIDI): 24 minutes per customer per year
Average outages (SAIFI): — per customer
Average restoration time (CAIDI): — minutes
As reported for South Dakota under the Other 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: 853 GWh
Winter peak demand: 124 MW
Energy losses: 1.3% of energy handled
Meters & rooftop solar (2025)
Smart (AMI) meters: 100.0% of 31,723 meters
Customer-sited generation (net metering): 24 installations, 0.3 MW of capacity
Counties served
Bon Homme, SDClay, SDDouglas, SDHanson, SDHutchinson, SDLake, SDLincoln, SDMcCook, SDMiner, SDMinnehaha, SDTurner, SDUnion, SDYankton, 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¢
- West River Electric Assn Inc - 21,332 customers, residential 15.16¢
- 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 #19293 in the EIA frame.