Is solar worth it in South Dakota?
A 7.0 kW rooftop system near Sioux Falls produces about 9,957 kWh a year. Priced against 15 current residential tariffs in South Dakota, payback runs from 13 years on the best of them to 37 on the worst.
Why the tariff matters more than the panels
Two households in South Dakota with identical roofs and identical systems can see paybacks 13 and 37 years apart, purely because they are on different tariffs. Solar produces at midday; households consume in the evening. Only 52% of what these panels make is used as it is made — the rest is exported, and what an exported kWh earns is set by the tariff and by state net metering rules, not by the hardware.
That is why the figures here are computed hour by hour against each real tariff rather than by taking a bill and assuming solar removes a share of it. How this is modeled →
Payback by tariff in South Dakota
7.0 kW system at $3.00/W, household using 1000 kWh a month, no incentives. A range means the export credit is not filed with the tariff and the outcome depends on net metering rules — 12 of 15 tariffs here belong to a utility that reports residential net metering.
| Utility | Tariff | Structure | Annual saving | Payback |
|---|---|---|---|---|
| Northern States Power Co - Minnesota | Residential TOD Overhead Standard (A02) | Time-of-use | $901–$1,677 | 13–23y |
| Northern States Power Co - Minnesota | Residential Service - Overhead Standard (A01) | Time-of-use | $847–$1,616 | 13–25y |
| Northern States Power Co - Minnesota | Residential Service - Underground Standard (A03) | Time-of-use | $847–$1,616 | 13–25y |
| Northern States Power Co - Minnesota | Residential TOD Underground Standard (A04) | Time-of-use | $857–$1,600 | 13–25y |
| Northern States Power Co - Minnesota | Residential TOD Underground Electric Space Heating (A04) | Time-of-use | $796–$1,468 | 14–26y |
| Northern States Power Co - Minnesota | Residential TOD Overhead Electric Space Heating (A02) | Time-of-use | $796–$1,468 | 14–26y |
| Northern States Power Co - Minnesota | Residential Service - Underground Electric Space Heating (A03) | Time-of-use | $740–$1,390 | 15–28y |
| Northern States Power Co - Minnesota | Residential Service - Overhead Electric Space Heating (A01) | Time-of-use | $740–$1,390 | 15–28y |
| MidAmerican Energy Co | RATE RS - RESIDENTIAL SERVICE | Time-of-use + tiered | $535–$1,014 | 21–39y |
| MidAmerican Energy Co | RATE RST - RESIDENTIAL TIME-OF-USE SERVICE | Time-of-use | $569–$991 | 21–37y |
| MidAmerican Energy Co | RATE GE - GENERAL ENERGY SERVICE (Residential) | Time-of-use + tiered | $488–$920 | 23–43y |
| MidAmerican Energy Co | RATE GET - GENERAL ENERGY TIME-OF-USE SERVICE (Residential) | Time-of-use + tiered | $503–$877 | 24–42y |
| NorthWestern Energy | Rate 10: Residential Electric | Tiered | $867 | 24y |
| NorthWestern Energy | Rate 11: Residential Service with Space Heating | Tiered | $867 | 24y |
| NorthWestern Energy | Rate 14: Residential Space Heating and Cooling | Flat | $565 | 37y |
Price it for your own usage and system size →
What would change this
Your roof. Production is modeled for Sioux Falls on a south-facing array at 20° tilt. Shading, orientation and pitch all move it, and solar resource varies within South Dakota itself.
Your usage pattern. A household at home during the day self-consumes more and exports less, which shortens payback wherever export credit is poor.
Rising rates. These figures hold today's prices flat. Electricity prices have been rising, and every rise shortens payback — so treat these as a conservative bound.
State and local incentives. Not included here, and in some states they are worth more than the federal credit was. Check your state energy office before deciding.