Key takeaways
- A well-placed rooftop system in the Fox Valley typically produces somewhere around 1,100 to 1,250 kWh per installed kilowatt per year, with most of it from April through September.
- The 30 percent federal tax credit ended for expenditures after 2025. Focus on Energy’s 2026 rebate of $600 per kW, up to $2,400, partly fills the gap.
- Net metering rules vary by utility. Most local utilities net within the monthly bill and pay a lower buyback rate for surplus, so sizing to your usage matters.
- Under realistic assumptions, simple payback for a typical system runs roughly 12 to 22 years. Efficiency upgrades first make solar go further.
Rooftop solar has changed a great deal in northeast Wisconsin over the past few years. Panel prices fell, more local installers entered the market, and then, at the end of 2025, the federal residential solar tax credit ended. If you have been wondering whether solar still makes sense on a Fox Valley roof in 2026, this guide walks through the real numbers: what systems cost, how much they produce in our climate, how net metering works with local utilities, and how to estimate your own payback honestly.
One principle before we start: the cheapest kilowatt-hour is the one you never use. If you have not yet tackled air sealing, insulation and efficient lighting, read our guide to home energy upgrades ranked by payback first. A more efficient home needs a smaller, cheaper solar array.
How much sun does the Fox Valley actually get?
Wisconsin is not Arizona, but it is a perfectly workable place for solar. Panels respond to light, not heat, and they actually run more efficiently in cool weather. For a south-facing, unshaded roof at a typical pitch in the Appleton, Oshkosh or Green Bay area, modeling tools commonly estimate roughly 1,100 to 1,250 kilowatt-hours (kWh) per year for each kilowatt (kW) of panels. East- or west-facing roofs produce somewhat less, and shading from trees or neighboring buildings can cut output considerably.
The best free tool for estimating your own roof is NREL’s PVWatts calculator. Enter your address, system size, tilt and orientation, and it estimates monthly and annual production using long-term weather data for your location.
The seasonal swing
Expect a big difference between summer and winter. Long June days with a high sun can produce several times more electricity than short December days, when panels may also be under snow for part of the month. This seasonal pattern matters for net metering, as you will see below.
Snow and cold
Snow usually slides off tilted panels within a few days of a storm, often faster on sunny days because the dark glass warms up. Most installers advise against climbing on a snowy roof to clear panels; the winter production you would gain is small and the risk is not. Do plan for snow sliding off in sheets onto walkways, decks or entrances below the array. Snow guards or careful layout can help.
What rooftop solar costs in 2026
Installed prices vary by system size, equipment, roof complexity and installer. Recent Wisconsin estimates have commonly ranged from around $2.75 to $3.50 per watt before incentives for a typical residential system. That puts a 6 kW system, a common size for a Fox Valley home, at roughly $16,500 to $21,000 before incentives.
Incentives available in 2026
- Federal tax credit: ended. The residential clean energy credit (Section 25D), which covered 30 percent of system costs, does not apply to expenditures made after December 31, 2025, according to the IRS.
- Focus on Energy rebate. For 2026, Focus on Energy offers single-family homes $600 per kW of capacity, up to $2,400 per system, when installed by a participating Trade Ally contractor. The system must be installed in 2026, and you must apply within 60 days of installation and no later than January 31, 2027.
- State tax exemptions. Wisconsin law exempts solar energy systems from property tax assessment and solar equipment from state sales tax.
- Utility programs. Some utilities offer their own solar, battery or renewable energy programs. Ask yours directly, since offerings change.
Net metering in the Fox Valley
Net metering determines what your solar electricity is worth, so it matters as much as panel price. Depending on your address, your electric utility might be We Energies, Wisconsin Public Service, Alliant Energy’s Wisconsin Power and Light, or a municipal utility such as Kaukauna Utilities, Menasha Utilities or New London Utilities. Each sets its own net metering terms, approved by the Public Service Commission of Wisconsin.
How it typically works
When your panels produce more than your home is using at that moment, the surplus flows to the grid and your meter records it. Under the arrangements common at local investor-owned utilities, exports and imports are netted within each monthly billing period. Electricity that offsets your own monthly usage is effectively worth your full per-kWh retail rate. Any net surplus left over for the month is typically credited at a lower buyback rate, often a few cents per kWh.
Net metering thresholds also differ. Wisconsin Public Service and Wisconsin Power and Light apply standard net metering to systems up to 20 kW, while We Energies’ threshold is higher. A typical home system falls well under these limits.
Why sizing matters
Because summer production is high and the monthly surplus earns less than retail, an oversized system can push a lot of June and July output into the lower buyback rate. For most households, the best value comes from sizing the array to cover a portion of annual use rather than all of it, then using more of your own power during sunny hours where practical: running the dishwasher, laundry or EV charging in the middle of the day.
Rules are under review
After Madison Gas and Electric and Alliant proposed reducing net metering compensation in 2023, the Public Service Commission rejected those proposals and opened a statewide investigation into net metering. In July 2025, the Commission decided not to pursue a separate Wisconsin-specific value of solar study but continued examining rate designs, adoption and customer impacts. Policies could change in future rate cases, so check your utility’s current tariff and the Public Service Commission of Wisconsin for updates before you sign.
Running the payback numbers
Simple payback is your net cost divided by your yearly bill savings. The table below shows three illustrative scenarios for a 6 kW system producing about 7,200 kWh a year (1,200 kWh per kW). These are worked examples using stated assumptions, not quotes. They ignore future electricity price increases (which would shorten payback), panel degradation and financing costs (which would lengthen it).
| Assumption | Conservative | Middle | Favorable |
|---|---|---|---|
| Installed price | $3.50 per watt ($21,000) | $3.00 per watt ($18,000) | $2.75 per watt ($16,500) |
| Focus on Energy rebate | $2,400 | $2,400 | $2,400 |
| Net cost | $18,600 | $15,600 | $14,100 |
| Share offsetting your own monthly use | 70% at 15 cents/kWh | 80% at 16 cents/kWh | 90% at 17 cents/kWh |
| Monthly surplus credited | 30% at 4 cents/kWh | 20% at 4 cents/kWh | 10% at 4 cents/kWh |
| Estimated yearly savings | About $840 | About $980 | About $1,130 |
| Simple payback | About 22 years | About 16 years | About 12.5 years |
Two things stand out. First, the price you pay per watt matters a lot, so getting multiple quotes is worth the effort. Second, the share of solar output you use yourself within each month has a big effect. That is why right-sizing and shifting flexible loads to sunny hours pay off.
Most panels carry performance warranties of around 25 years, and many systems keep producing beyond that. Inverters often need replacement sometime during the system’s life, which is worth budgeting for.
Step by step: going solar in the Fox Valley
- Cut your usage first. Do the low-cost efficiency upgrades and swap to LEDs. Every kWh you save is one you do not need to buy panels for.
- Check your roof. Note its age, condition, orientation and shading. If it needs replacing within about a decade, plan that first.
- Know your numbers. Gather 12 months of electric usage and look up your utility and its current net metering tariff.
- Estimate production. Run PVWatts for your address so you can sanity-check installer estimates.
- Get at least three quotes. Use Focus on Energy’s Trade Ally search to find participating installers. Compare price per watt, equipment, warranties, production estimates and who handles service.
- Reserve your rebate. Make sure the Focus on Energy reservation is submitted before installation.
- Permits and interconnection. Your installer typically handles the municipal permit and the utility interconnection application. Do not turn the system on until the utility approves it.
- Apply and monitor. Submit the rebate application within 60 days, then use your monitoring app to watch production and catch problems early.
Batteries, alternatives and red flags
Do you need a battery?
A standard grid-tied system shuts off during a power outage to protect line workers. A battery can keep critical loads running, which is valuable if you rely on medical equipment, a sump pump or a well, or if summer storms knock out your power often. Under monthly net metering, though, batteries rarely pay for themselves financially. Treat backup as a resilience purchase.
If your roof is not a good fit
Heavy shade, a north-facing roof or renting does not have to rule you out. Ask your utility about community solar or renewable energy subscription programs, and consider putting your effort into efficiency, which pays back faster anyway.
Sales pitches to question
- Any 2026 pitch that still promises the 30 percent federal tax credit on a homeowner-owned system.
- “Free solar” offers, or loans with large hidden dealer fees built into the price.
- Production estimates far above what PVWatts shows for your roof.
- High-pressure, sign-today tactics. A good installer will give you time to compare. The Wisconsin Department of Agriculture, Trade and Consumer Protection publishes consumer buying tips if you have concerns.
Next steps
- Shrink your load first with our guide to home energy efficiency for Wisconsin winters.
- Want a second opinion on your bills and whether solar fits? Our virtual Home Energy & Waste Assessment looks at your usage and priorities.
- Browse more tools and local contacts on our Resources page.
Get an assessment See resources
Frequently asked questions
Does solar work in Wisconsin winters?
Yes, but production is seasonal. Panels produce much less in December and January because of short days, low sun angles and snow cover, and much more from late spring through summer. Cold temperatures actually help panel efficiency, and snow usually slides off tilted panels within days after a storm.
Can I still get the 30 percent federal solar tax credit?
No, not for a new system. The federal residential clean energy credit (Section 25D) does not apply to expenditures made after December 31, 2025. Be wary of any 2026 sales pitch that still promises it for a homeowner-owned system.
How much is the Focus on Energy solar rebate in 2026?
For single-family homes, Focus on Energy offers $600 per kilowatt of capacity, up to $2,400, for systems installed in 2026 by a participating Trade Ally contractor. Your electric utility must participate in Focus on Energy, you need to reserve the rebate before installation, and you must apply within 60 days of installation and no later than January 31, 2027.
Will solar panels raise my property taxes?
Wisconsin law exempts solar energy systems from property tax assessment, so adding panels should not increase your assessed value for tax purposes. Solar equipment is also exempt from Wisconsin sales tax. Confirm details with your installer or the Wisconsin Department of Revenue.
Do I need a battery with rooftop solar?
Not for the system to work. A grid-tied system without a battery shuts off during outages for safety. A battery adds backup power, which is valuable if you have medical equipment or frequent outages, but under monthly net metering it usually lengthens your financial payback.
Should I replace my roof before installing solar?
If your roof will need replacing within roughly the next 10 years, it usually makes sense to do it first. Removing and reinstalling panels later adds cost. Ask your installer to inspect the roof and give you a written opinion.
