Solar in Sun Prairie, WI
With Alliant Energy (Wisconsin Power & Light)'s electricity at about 19.1¢ per kWh and 1,314 kWh of sun per kW, solar is worth it for a typical Sun Prairie home today: about a 12.6-year payback.
- Payback, typical home
- 12.6 yrsWisconsin: 13.2 yrs
- 25-year net
- $22,850after paying $18,200
- Sun
- 1,314kWh per kW per year
- Electricity
- 19.1¢6% above U.S. average
A typical Sun Prairie home, by the numbers
| Utility | Alliant Energy (Wisconsin Power & Light) |
|---|---|
| Electricity use | 694 kWh a month |
| Best-value system | 5.7 kW, about 13 panels, 7,492 kWh a year (90% of use) |
| Cost | $20,600, or $18,200 after state incentives |
| First-year savings | $1,434 |
| Payback | 12.6 years |
| Exported power | Full retail net metering (Alliant Energy (Wisconsin Power & Light)) |
Cash purchase, no federal credit, 2.5% yearly rate increases. Run it with your own numbers.
Homes in Sun Prairie
- Owner-occupied homes
- 61%
- Single-family detached
- 50%
- Median home value
- $366k
- Median year built
- 1999
- Population
- 37,570
- Solar installs, last 3 years*
- 137
- Roofs suitable for solar†
- 99%
Census ACS 2020–2024. *Installations in public records for this area's ZIP codes. †Share of 8,296 buildings Google Project Sunroof rated technically suitable (2019 snapshot).
Installers working in Sun Prairie
Companies with the most installations in Sun Prairie's ZIP codes over the last 3 years, from public records. We don't take payment for placement.
- Everlight Solar 74 installs
- All Energy Solar 12 installs
- Midwest Solar Power 10 installs
- Next Energy 9 installs
- Drews Solar 6 installs
- Freedom Forever 5 installs
- National Solar 4 installs
- Home Team Energy 3 installs
- Arch Electric 2 installs
- Eagle Point Solar 2 installs
Always verify the license and get at least three quotes. Compare quotes side by side.
Questions about solar in Sun Prairie
Is solar worth it in Sun Prairie, WI?
For a typical home in Sun Prairie, solar is worth it at 2026 prices: a 5.7 kW system costs about $18,200 after state incentives, saves about $1,434 in year one and pays back in about 12.6 years. Enter your address for an estimate based on your roof and bill.
How much solar power does a system produce in Sun Prairie?
About 1,314 kWh per year for each kW of panels on a south-facing roof, based on PVWatts and local weather. That's 1% less than the Wisconsin average. East- or west-facing roofs produce roughly 10–20% less.
Who is the electric utility in Sun Prairie?
Most homes in Sun Prairie are served by Alliant Energy (Wisconsin Power & Light), at about 19.1¢ per kWh on average. Some areas are served by Madison Gas & Electric, Sun Prairie Utilities, Adams-Columbia Electric Cooperative.
How much do solar panels cost in Sun Prairie?
A fair cash price is around $3.50 per watt before incentives, so about $20,600 for a 5.7 kW system. There's no federal tax credit for homeowners who buy in 2026.
Nearby
- Madison 11.5 yrs
- Fitchburg 11.3 yrs
- Janesville 12.3 yrs
- Beloit 12.4 yrs
- Waukesha 11.6 yrs
- West Bend 11.8 yrs
- Menomonee Falls 11.5 yrs
- Brookfield 11.6 yrs
- All of Wisconsin
Data: PVWatts (National Laboratory of the Rockies), EIA-861 2025 adjusted to 2026, U.S. Census ACS, LBNL Tracking the Sun, state policy research as of October 2026.