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NorthWestern Energy - (SD)
NorthWestern Energy - (SD) served 51,787 residential customers in South Dakota in 2025 (11.6% of the state's residential customers), the 3rd largest of 21 utilities reporting there. Bundled service; ownership: investor owned; balancing authority SWPP.
The meter, one average month.
Scroll to run 30 days of NorthWestern Energy - (SD)'s average residential use through a five-dial register.
- Used so far
- 939 kWh
- At 13.35¢/kWh
- $125
Price ruler0 to 50¢ per kWh
Where 13.35¢ sits.
NorthWestern Energy - (SD) averaged 13.35¢ per kWh against a South Dakota residential average of 13.38¢: 0.2% below the state figure. Among the 6 investor owned utilities in South Dakota with bundled residential sales, it ranks 5th from the lowest price.
2020 and 2025EIA-861
Five years, same meter.
In 2020 the average NorthWestern Energy - (SD) home used 960 kWh a month at 11.4¢ and paid $109. In 2025 it used 939 kWh at 13.35¢ and paid $125: the price per kWh is up 17.1%.
| Measure | 2020 | 2025 |
|---|---|---|
| Price, ¢/kWh | 11.4 | 13.35 |
| Use, kWh a month | 960 | 939 |
| Bill, US$ a month | 109.43 | 125.34 |
| Class | Customers | MWh sold | ¢/kWh |
|---|---|---|---|
| Residential | 51,787 | 583,439 | 13.35 |
| Commercial | 13,551 | 686,653 | 13.02 |
| Industrial | 58 | 386,156 | 8.85 |
Who else is on the line
Homes are one class.
Homes took 35.2% of the electricity NorthWestern Energy - (SD) sold in South Dakota in 2025.
Service territoryEIA-861
27 counties.
AuroraBeadleBon HommeBrownBruleCharles MixClarkCodingtonDavisonDayDeuelDouglasEdmundsFaulkHamlinHandHansonHughesHutchinsonHydeJerauldKingsburyMarshallSanborn
Counties in South Dakota where NorthWestern Energy - (SD) reported serving customers in 2025 (27 in all; up to 24 listed).
EIA-8612025Utility 13809
The filing, line by line.
| Measure | Value | Unit |
|---|---|---|
| Average price | 13.35 | ¢/kWh |
| South Dakota average price | 13.38 | ¢/kWh |
| Difference from state average | -0.2 | % |
| Price change over 5 years | 17.1 | % |
| Typical monthly use | 939 | kWh |
| Typical monthly bill | 125.34 | US$ |
| Residential customers | 51,787 | accounts |
| Share of SD residential customers | 11.6 | % |
| Size rank in SD | 3 of 21 | by customers |
| Price rank, investor owned peers | 5 of 6 | 1 = lowest |
Rate plans on fileOpenEI URDB
4 active plans.
- Time-of-use
- 0more than one energy period within a month
- Seasonal only
- 0price changes by month, not by hour
- Median fixed charge
- $5.50US dollars per month
- Median flat energy rate
- 8.56¢cents per kWh, one period and one tier
Active residential plans: not ended, started within the last 5 years, latest version of each plan name. Time-of-use means more than one energy period within a single month; plans whose price changes only by season are counted as seasonal.
South Dakota: state average, five-year steps and every provider