Residential tariff · SD
Rate 14: Residential Space Heating and Cooling
NorthWestern Energy · Flat · filed 2025
What this tariff charges
| Fixed charge | $4.00 per month |
|---|---|
| Structure | Flat |
| 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 | no limit | 0.08558 | 0.02343 | 0.10901 |
What it costs at different usage levels
| kWh per month | Annual total | Effective $/kWh |
|---|---|---|
| 500 | $702.06 | $0.1170 |
| 1000 | $1,356.12 | $0.1130 |
| 2000 | $2,664.24 | $0.1110 |
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 $565 a year on this tariff, paying back in 37 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 available to urban and rural residential customers for electric service used for space heating purposes, or for a combination space heating and cooling installation (heat pump). All other electric usage by the customer must be separately metered and billed pursuant to another Company filed tariff schedule. Service under this schedule shall be single phase or three phase where three phase is available.
URDB rate id 68a2f91abb4b80194303b448 · utility source document · all NorthWestern Energy tariffs