Residential tariff · SD
Rate 10: Residential Electric
NorthWestern Energy · Tiered · filed 2025
What this tariff charges
| Fixed charge | $7.00 per month |
|---|---|
| Structure | Tiered |
| Filed | 2025-05-01 |
Energy rates
The charged price is the base rate plus its adjustment. Adjustments carry fuel and rider costs and are frequently most of the bill, so a comparison built on the base rate alone is meaningless.
Energy charge
| Tier | Up to | Base | Adjustment | Charged $/kWh |
|---|---|---|---|---|
| 1 | 200.0 kWh | 0.15077 | 0.02343 | 0.17420 |
| 2 | 800.0 kWh | 0.14895 | 0.02343 | 0.17238 |
| 3 | 1000.0 kWh | 0.13804 | 0.02343 | 0.16147 |
| 4 | 1200.0 kWh | 0.11800 | 0.02343 | 0.14143 |
| 5 | no limit | 0.07456 | 0.02343 | 0.09799 |
What it costs at different usage levels
| kWh per month | Annual total | Effective $/kWh |
|---|---|---|
| 500 | $1,122.65 | $0.1871 |
| 1000 | $2,130.74 | $0.1776 |
| 2000 | $3,410.88 | $0.1421 |
Effective rate includes the fixed charge, which is why it falls as usage rises.
Rooftop solar on this tariff
A 7 kW system costing $21,000 before incentives would save $867 a year on this tariff, paying back in 24 years. No federal tax credit is included: Section 25D ended on December 31, 2025.
no sell rate filed and this utility reports no residential net metering - exports credited at zero. Compare across this state →
The utility's own description
This schedule is for electric service to urban and rural residential customers for domestic purposes. Service under this rate schedule shall be single or three phase if three phase is available
URDB rate id 68a2da0765a327e30509d9cc · utility source document · all NorthWestern Energy tariffs