Residential tariff · SD
Rate 11: Residential Service with Space Heating
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 where all electricity is served through one meter, and the customer has in regular use an approved space heating installation which represents the primary source of space heating. Service under this rate schedule shall be single phase or three phase if three phase is available.
URDB rate id 68a2f86d6c8cf4a2110d3388 · utility source document · all NorthWestern Energy tariffs