US Energy Price Monitorby KadoaUpdated weeklyStar on GitHub

NewInsight: Investor-owned utilities charge 23% more for power

South Dakota

NorthWestern Energy electricity rates

What homes pay NorthWestern Energy for electricity, from EIA.

Investor-owned utility, 52,078 homes in South Dakota. EIA lists it as NorthWestern Energy - (SD).

Headlines

Average price
14.1¢ a kWh
Up 8.8% on a year ago
Average bill
$131 a month
Up 7.5% on a year ago
Average use
926 kWh
A month. South Dakota 983 kWh
Price rank in South Dakota
5 of 8
1 is the most expensive

Over the 12 months to August 2026, NorthWestern Energy homes paid 14.1¢ a kWh, against 14.3¢ across South Dakota.

NorthWestern Energy vs South Dakota

NorthWestern EnergySouth Dakota
Average price, 12 months to August 202614.1¢14.3¢
Price in August 202614.1¢15.2¢
Average monthly bill, 12 months$131$140
Bill in August 2026$162$160
Average monthly use926 kWh983 kWh
Price change, past year+8.8%+8.2%
Price change since 2019+33%+24%

Electricity price

Average residential price a kilowatt-hour, by month.

Up to and including August 2026

Source: EIA-861M monthly utility survey. Revenue over kilowatt-hours sold, including fixed charges.

Average monthly bill

What an average home pays a month.

Up to and including August 2026

Source: EIA-861M monthly utility survey.