South Dakota · Investor Owned
Otter Tail Power Co
11.42¢ per kWh, bundled, EIA-861 2025. Average bill $123.34 at 1,079.9 kWh a month, across 9,094 customers on that row.
South Dakota averaged 13.32¢/kWh and $131.10 a month. The United States averaged 17.23¢/kWh and $150.68. State and national figures come from EIA's Average Bill file.
Revenue divided by sales, EIA-861 Sales to Ultimate Customers, 2025, released October 7, 2026. Texas wires utilities come from the Delivery Companies file. The price and bill use bundled service. Customer count: 9,094, the largest residential count across service types.
Estimate a bill
The figure below is this utility's 2025 EIA residential average.
2025 EIA average
$114.20
11.42¢/kWh × 1,000 kWh. Bundled residential average, EIA-861 2025. The customer charge is already folded into this average, so it stands beside a tariff total rather than being added to it.
Annual history
| Year | ¢/kWh | Avg. bill | Avg. kWh | Customers |
|---|---|---|---|---|
| 2015 | 9.13¢ | $100.74 | 1,103.3 | 8,689 |
| 2016 | 9.25¢ | $99.17 | 1,071.9 | 8,710 |
| 2017 | 9.35¢ | $101.75 | 1,088.7 | 8,736 |
| 2018 | 9.42¢ | $110.34 | 1,171.0 | 8,741 |
| 2019 | 10.44¢ | $121.60 | 1,165.3 | 8,800 |
| 2020 | 9.94¢ | $110.57 | 1,112.0 | 8,858 |
| 2021 | 10.66¢ | $114.55 | 1,074.7 | 8,945 |
| 2022 | 11.05¢ | $125.13 | 1,132.3 | 8,972 |
| 2023 | 11.12¢ | $121.87 | 1,095.8 | 9,006 |
| 2024 | 10.93¢ | $111.78 | 1,022.9 | 9,048 |
| 2025 | 11.42¢ | $123.34 | 1,079.9 | 9,094 |
EIA-861, 2015–2025, using the same service type as the 2025 figure. A blank year means that service was not in the file.
Counties
Brookings, Codington, Day, Deuel, Grant, Hamlin, Kingsbury, Lake, Marshall, Moody, Roberts.
EIA-861 Service Territory, 2025. A listed county is the county EIA recorded. It does not mean every address in the county is served. Open this utility in the bill calculator · Rate history tool