Solar in Janesville, WI
With Alliant Energy (Wisconsin Power & Light)'s electricity at about 19.1¢ per kWh and 1,346 kWh of sun per kW, solar is worth it for a typical Janesville home today: about a 12.3-year payback.
- Payback, typical home
- 12.3 yrsWisconsin: 13.2 yrs
- 25-year net
- $23,499after paying $17,900
- Sun
- 1,346kWh per kW per year
- Electricity
- 19.1¢6% above U.S. average
A typical Janesville home, by the numbers
| Utility | Alliant Energy (Wisconsin Power & Light) |
|---|---|
| Electricity use | 694 kWh a month |
| Best-value system | 5.6 kW, about 13 panels, 7,535 kWh a year (90% of use) |
| Cost | $20,300, or $17,900 after state incentives |
| First-year savings | $1,442 |
| Payback | 12.3 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 Janesville
- Owner-occupied homes
- 67%
- Single-family detached
- 68%
- Median home value
- $223k
- Median year built
- 1972
- Population
- 66,030
- Solar installs, last 3 years*
- 134
- Roofs suitable for solar†
- 78%
Census ACS 2020–2024. *Installations in public records for this area's ZIP codes. †Share of 16,630 buildings Google Project Sunroof rated technically suitable (2019 snapshot).
Older housing stock. Many homes here were built before 1975. Have the roof and electrical panel checked before signing; a roof or panel upgrade can add thousands. Roof first?
Installers working in Janesville
Companies with the most installations in Janesville's ZIP codes over the last 3 years, from public records. We don't take payment for placement.
- Everlight Solar 104 installs
- Tron Solar 7 installs
- All Energy Solar 3 installs
- Eagle Point Solar 3 installs
- Next Energy 3 installs
- Freedom Forever 3 installs
- Home Team Energy 3 installs
- Traditions 1291006 2 installs
- Greenlink Energy Solutions 1 installs
- Sol Energy New Mexi 1 installs
Always verify the license and get at least three quotes. Compare quotes side by side.
Questions about solar in Janesville
Is solar worth it in Janesville, WI?
For a typical home in Janesville, solar is worth it at 2026 prices: a 5.6 kW system costs about $17,900 after state incentives, saves about $1,442 in year one and pays back in about 12.3 years. Enter your address for an estimate based on your roof and bill.
How much solar power does a system produce in Janesville?
About 1,346 kWh per year for each kW of panels on a south-facing roof, based on PVWatts and local weather. That's 1% more than the Wisconsin average. East- or west-facing roofs produce roughly 10–20% less.
Who is the electric utility in Janesville?
Most homes in Janesville are served by Alliant Energy (Wisconsin Power & Light), at about 19.1¢ per kWh on average. Some areas are served by Rock Energy Cooperative, We Energies.
How much do solar panels cost in Janesville?
A fair cash price is around $3.50 per watt before incentives, so about $20,300 for a 5.6 kW system. There's no federal tax credit for homeowners who buy in 2026.
Nearby
- Beloit 12.4 yrs
- Fitchburg 11.3 yrs
- Madison 11.5 yrs
- Sun Prairie 12.6 yrs
- Waukesha 11.6 yrs
- Muskego 11.8 yrs
- New Berlin 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.