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NorthWestern Energy electric rates

Updated October 7, 2026 · Source: EIA Form 861 (2024)

Investor-owned utility serving 51,467 homes in South Dakota.

Your rate

12.56¢per kWh, average residential rate 24% lower than the U.S. average (16.4¢)

$113average monthly bill$1,360 a year

903kWh used per month, average home

+10%rate change since 2020U.S. average: +28%

Estimate your bill

Electricity you use each month (kWh)

It's on your bill, usually near the top. Starting at 903 kWh, the average for NorthWestern Energy homes.

kWh

$113 a month

$12 fixed charge + 11.2¢ × 903 kWh

This is an estimate. Uses the EIA average rate with a nominal $12 fixed charge; real tariffs have tiers, time-of-use pricing and riders. Your bill also includes taxes and fuel adjustments that change month to month.

Rate cases

No rate case on file for NorthWestern Energy right now. We check regulator dockets weekly; last check October 7, 2026. Know of one?

Rate history

NorthWestern Energy's average rate is up 10% since 2020, versus +28% for the U.S. average.

Average residential revenue per kWh, EIA-861. Includes delivery and, where the utility sells it, supply.

Rebates for heat pumps, batteries and EV chargers

We haven't found utility-level rebates for NorthWestern Energy yet. Check South Dakota programs or read what's left after the federal credits ended.

About NorthWestern Energy

Ownership: Investor Owned
Homes served: 51,467 residential customers (2024)
Grid operator: SWPP
Retail choice: No — one bundled rate
Data: EIA-861 2024, released October 7, 2026; rate cases checked October 7, 2026

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