NorthWestern Energy: average rate and electric bill (2025)
NorthWestern Energy (investor-owned utility, South Dakota) served 51,787 homes in 2025. The average customer used 939 kWh a month and paid $125, an average price of 13.3¢ per kWh including fixed charges, riders and taxes. That is about the same as the South Dakota average of 13.3¢.
What a bill costs at NorthWestern Energy's average price
| Monthly usage | Estimated bill |
|---|---|
| 500 kWh | $67 |
| 1,000 kWh | $134 |
| 1,500 kWh | $200 |
The average price spreads fixed monthly charges over all kWh. At low usage your price per kWh is higher, at high usage lower. Your current tariff can differ from the 2025 average, especially after a rate case.
Calculate your bill · Heat pump vs furnace with this rate
Compare with other utilities in South Dakota
| Name | ¢/kWh | Avg. bill |
|---|---|---|
| Southeastern Electric Coop Inc | 13.0 | $151 |
| Northern States Power Co - Minnesota | 13.1 | $101 |
| NorthWestern Energy | 13.3 | $125 |
| Sioux Valley SW Elec Coop | 13.9 | $176 |
| Black Hills Power, Inc. | 15.1 | $106 |
Source: U.S. Energy Information Administration, Form EIA-861 annual data 2025 (released October 2026), utility ID 13809. Average price = residential revenue ÷ residential kWh sold; average bill = revenue ÷ customers ÷ 12.