NorthWestern Energy (SD) electricity rates in South Dakota, 2025
NorthWestern Energy (SD)’s 51,787 residential customers paid an average of 13.35¢ per kWh in 2025, 0% above the South Dakota average of 13.32¢. The typical home used 939 kWh a month, for an average bill of $125.
- 13.35¢avg ¢/kWh (2025)+0.79¢ (+6.3%) vs 2024
- $125Avg monthly billSouth Dakota: $131
- 939 kWhAvg monthly useSouth Dakota: 984 kWh
- 51,787Residential customersFull-service utility
| Sector | Customers | Sales (MWh) | Revenue | ¢/kWh 2025 | ¢/kWh 2024 | Change |
|---|---|---|---|---|---|---|
| Residential | 51,787 | 583,439 | $77,894,000 | 13.35¢ | 12.56¢ | +0.79¢ (+6.3%) |
| Commercial | 13,551 | 686,653 | $89,412,000 | 13.02¢ | 12.01¢ | +1.01¢ (+8.4%) |
| Industrial | 58 | 386,156 | $34,174,000 | 8.85¢ | 7.92¢ | +0.93¢ (+11.7%) |
| All sectors | 65,396 | 1,656,248 | $201,480,000 | 12.16¢ | 11.12¢ | +1.05¢ (+9.4%) |
How NorthWestern Energy (SD) 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, NorthWestern Energy (SD) ranks 15 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 6.3%; the state average rose 3.6%.
- NorthWestern Energy (SD) is an investor-owned utility, a private company whose rates are set by the state utility commission. Balancing authority: SWPP.
Where NorthWestern Energy (SD) serves
EIA lists 27 South Dakota counties in its 2025 service territory: Aurora, Beadle, Bon Homme, Brown, Brule, Charles Mix, Clark, Codington, Davison, Day, Deuel, Douglas, Edmunds, Faulk, Hamlin, Hand, Hanson, Hughes, Hutchinson, Hyde, Jerauld, Kingsbury, Marshall, Sanborn, Spink, Turner, Yankton.
South Dakota full-service utilities with similar rates
| Provider | ¢/kWh | Avg bill | Customers |
|---|---|---|---|
| City of Madison (SD) | 12.41¢ | $131 | 2,818 |
| City of Volga (SD) | 12.79¢ | $119 | 1,094 |
| Southeastern Electric Coop Inc (SD) | 12.98¢ | $151 | 20,959 |
| Montana-Dakota Utilities Co | 12.99¢ | $111 | 6,348 |
| Northern States Power Co - Minnesota | 13.13¢ | $101 | 94,137 |
| Sioux Valley SW Elec Coop | 13.94¢ | $176 | 22,989 |
| Central Electric Coop, Inc (SD) | 14.67¢ | $225 | 6,515 |
| Black Hills Electric Coop, Inc | 14.79¢ | $166 | 9,415 |
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.
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.
All South Dakota electricity providers · How we compute rates