Montana-Dakota Utilities Co electricity rates in South Dakota, 2025
Montana-Dakota Utilities Co’s 6,348 residential customers paid an average of 12.99¢ per kWh in 2025, 3% below the South Dakota average of 13.32¢. The typical home used 852 kWh a month, for an average bill of $111.
- 12.99¢avg ¢/kWh (2025)−1.61¢ (-11.0%) vs 2024
- $111Avg monthly billSouth Dakota: $131
- 852 kWhAvg monthly useSouth Dakota: 984 kWh
- 6,348Residential customersFull-service utility
| Sector | Customers | Sales (MWh) | Revenue | ¢/kWh 2025 | ¢/kWh 2024 | Change |
|---|---|---|---|---|---|---|
| Residential | 6,348 | 64,933 | $8,432,000 | 12.99¢ | 14.59¢ | −1.61¢ (-11.0%) |
| Commercial | 2,088 | 63,206 | $7,493,000 | 11.85¢ | 12.92¢ | −1.07¢ (-8.2%) |
| Industrial | 8 | 663 | $96,000 | 14.48¢ | 11.34¢ | +3.14¢ (+27.7%) |
| All sectors | 8,444 | 128,802 | $16,021,000 | 12.44¢ | 13.67¢ | −1.23¢ (-9.0%) |
How Montana-Dakota Utilities 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, Montana-Dakota Utilities Co ranks 13 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 fell 11.0%; the state average rose 3.6%.
- Montana-Dakota Utilities Co is an investor-owned utility, a private company whose rates are set by the state utility commission. Balancing authority: MISO.
Where Montana-Dakota Utilities Co serves
EIA lists 13 South Dakota counties in its 2025 service territory: Brown, Campbell, Corson, Day, Edmunds, Faulk, Grant, Harding, McPherson, Perkins, Potter, Roberts, Walworth.
25 ZIP codes are matched to Montana-Dakota Utilities Co in NREL’s 2024 ZIP file: 57401, 57428, 57437, 57441, 57442, 57448, 57450, 57451, 57452, 57455, 57456, 57466, 57471, 57472, 57473, 57475, 57481, 57601, 57631, 57632, 57640, 57645, 57646, 57658, 57724. 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 |
|---|---|---|---|
| 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 |
| Southeastern Electric Coop Inc (SD) | 12.98¢ | $151 | 20,959 |
| Northern States Power Co - Minnesota | 13.13¢ | $101 | 94,137 |
| NorthWestern Energy (SD) | 13.35¢ | $125 | 51,787 |
| Sioux Valley SW Elec Coop | 13.94¢ | $176 | 22,989 |
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.
All South Dakota electricity providers · How we compute rates