Otter Tail Power Co electricity rates in South Dakota, 2025
Otter Tail Power Co’s 9,094 residential customers paid an average of 11.42¢ per kWh in 2025, 14% below the South Dakota average of 13.32¢. The typical home used 1,080 kWh a month, for an average bill of $123.
- 11.42¢avg ¢/kWh (2025)+0.49¢ (+4.5%) vs 2024
- $123Avg monthly billSouth Dakota: $131
- 1,080 kWhAvg monthly useSouth Dakota: 984 kWh
- 9,094Residential customersFull-service utility
| Sector | Customers | Sales (MWh) | Revenue | ¢/kWh 2025 | ¢/kWh 2024 | Change |
|---|---|---|---|---|---|---|
| Residential | 9,094 | 117,850 | $13,459,800 | 11.42¢ | 10.93¢ | +0.49¢ (+4.5%) |
| Commercial | 2,933 | 446,118 | $35,011,300 | 7.85¢ | 7.33¢ | +0.52¢ (+7.0%) |
| Industrial | 0 | 0 | $0 | n/a | n/a | n/a |
| All sectors | 12,027 | 563,968 | $48,471,100 | 8.59¢ | 8.14¢ | +0.46¢ (+5.6%) |
How Otter Tail Power Co compares
- South Dakota residential average, 2025: 13.32¢ per kWh, 984 kWh a month, $131 average bill. U.S. average: 17.23¢, 874 kWh, $151.
- Among 21 full-service utilities in South Dakota with at least 1,000 residential customers, Otter Tail Power Co ranks 7 of 21 from lowest to highest average price.
- Latest monthly figure: South Dakota homes paid 15.15¢ per kWh in August 2026 (preliminary), against 13.90¢ in August 2025. Summer months often run higher than the annual average.
- From 2024 to 2025 this average rose 4.5%; the state average rose 3.6%.
- Otter Tail Power Co is an investor-owned utility, a private company whose rates are set by the state utility commission. Balancing authority: MISO.
Where Otter Tail Power Co serves
EIA lists 11 South Dakota counties in its 2025 service territory: Brookings, Codington, Day, Deuel, Grant, Hamlin, Kingsbury, Lake, Marshall, Moody, Roberts.
57 ZIP codes are matched to Otter Tail Power Co in NREL’s 2024 ZIP file: 56219, 57002, 57006, 57017, 57022, 57024, 57026, 57028, 57050, 57051, 57054, 57057, 57065, 57071, 57075, 57201, 57212, 57213, 57216, 57218, 57220, 57221, 57223, 57224, 57226, 57227, 57231, 57232, 57233, 57234, 57237, 57239, 57241, 57246, 57247, 57248, 57249, 57251, 57252, 57255, 57256, 57257, 57259, 57260, 57261, 57262, 57263, 57264, 57265, 57266, 57268, 57269, 57270, 57273, 57276, 57279, 57430. Utility boundaries do not follow ZIP lines, so a ZIP can have more than one provider.
South Dakota full-service utilities with similar rates
| Provider | ¢/kWh | Avg bill | Customers |
|---|---|---|---|
| Nebraska Public Power District | 10.08¢ | $124 | 1,047 |
| Oahe Electric Coop Inc | 10.54¢ | $170 | 2,335 |
| City of Brookings (SD) | 10.69¢ | $94 | 10,769 |
| City of Pierre (SD) | 10.94¢ | $99 | 6,183 |
| Northern Electric Coop, Inc | 11.43¢ | $239 | 5,823 |
| Rosebud Electric Coop Inc | 11.88¢ | $137 | 4,911 |
| City of Madison (SD) | 12.41¢ | $131 | 2,818 |
| City of Volga (SD) | 12.79¢ | $119 | 1,094 |
Sources
- U.S. Energy Information Administration, Annual Electric Power Industry Report, Form EIA-861, 2025 final data (f8612025.zip, file dated October 7, 2026): Sales to Ultimate Customers, Average Monthly Bill and Service Territory tables.
- EIA Form EIA-861, 2024 final data (f8612024.zip, file dated December 4, 2025), for the 2024 comparison.
- EIA Electric Power Monthly, Table 5.6.A (average price by state, August 2026 and August 2025; 2026 values are preliminary), file dated October 22, 2026.
- National Renewable Energy Laboratory via OpenEI, U.S. Electric Utility Companies and Rates: Look-up by Zipcode (2024) (investor-owned and other utilities, files dated November 10, 2025), used only to match ZIP codes to utilities.
Average price = residential revenue ÷ residential kWh sold, as reported to EIA. It includes fixed monthly charges, taxes passed through in revenue and seasonal tiers, averaged over the year. Your own rate depends on your tariff and usage.
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