Solar in Madison, WI: 2026 Cost, Savings & Payback
Calculate 2026 solar panel cost, payback, and 25-year bill savings in Madison, Wisconsin. Based on an estimated 3.8 peak sun hours/day, a 14.9¢/kWh planning electricity rate, Madison Gas & Electric (MGE) as the likely utility, and current IRS guidance for the ended federal residential clean energy credit.
Solar in Madison, WI: quick answer
A typical 6kW solar system in Madison costs about $16,500 before local or state incentives. For 2026 installs, the federal residential clean energy credit is modeled as $0, so the estimated cost remains about $16,500 before any local incentive. It produces about 6,658 kWh per year from 3.8 peak sun hours/day, saves about $993 per year, and reaches payback in about 16.6 years.
2026 6kW Cost
$16,500
Monthly Savings
$83
Production / kW
1,110 kWh
Panel Count
~15
3.8
Peak Sun Hours/Day
14.9¢
Planning Rate (¢/kWh)
16.6 yr
Payback Period
$34k
25-Year Savings
Madison Solar Overview
Calculate Your Madison Solar Savings
Madison average: $134/mo
South-facing roofs produce the most energy
Add $8,000-$12,000 for whole-home battery backup
Annual Production
kWh/year
Annual Savings
per year
Net System Cost
no 2026 federal credit applied
Payback Period
break-even time
Bill Offset and Export Assumptions
Current Annual Bill
$1,608
Estimated Usage
10,777 kWh
Bill Offset
62%
Used On Site
100%
Exported production is discounted in this planning model instead of being treated as a guaranteed one-for-one bill credit. For Madison, verify the current Madison Gas & Electric (MGE) export-credit method and any fixed monthly charges before relying on the payback number.
25-Year Total Savings
$33,919
Monthly Savings
$83
2026 Federal Credit
$0
Cumulative Savings vs System Cost
Cost Breakdown
| Item | Madison | National Avg |
|---|---|---|
| Gross System Cost (6kW) | $16,500 | $17,100 |
| 2026 Federal Residential Credit | -$0 | $0 |
| Net System Cost | $16,500 | $17,100 |
| Cost Per Watt | $2.75/W | $2.85/W |
Solar Potential in Madison
Sun Hours vs National Average
Madison gets 16% less sun than the national average, but high-efficiency panels compensate.
Climate Advantages
- About 174 sunny days per year (planning estimate)
- Estimated average temperature: 57.4°F, cooler temps actually improve panel efficiency
- Assumed roof size: 1,648 sq ft, enough for a 91-panel system
Madison Solar Incentives & Programs
Federal Residential Clean Energy Credit (Section 25D)
For 2026 planning, JouleIO does not subtract a federal residential clean energy credit. The IRS says the Residential Clean Energy Credit was 30% for eligible property installed from 2022 through December 31, 2025, and is not available for property placed in service after December 31, 2025.
Source: IRS Residential Clean Energy Credit and IRS One Big Beautiful Bill provisions.
Wisconsin State Incentives
Wisconsin Focus on Energy rebates; net metering at full retail
Net Metering: Madison Gas & Electric (MGE)
JouleIO's planning data marks net metering or a solar export credit as available for Madison Gas & Electric (MGE) customers in Madison. Export credits can be at retail or below-retail rates depending on the current tariff, so confirm terms with the utility that serves your address.
Environmental Impact in Madison
2.8
Tons CO2 Offset/Year
46
Equivalent Trees Planted
0.6
Homes Worth of Energy
Based on 6,658 kWh annual production with a 6kW system. EPA average: 0.417 metric tons CO2 per MWh, 10,632 kWh per US home.
Solar Energy in Madison, Wisconsin
Madison, Wisconsin receives an average of 3.8 peak sun hours per day, offering adequate solar resources for homeowners looking to reduce their electricity bills. With a planning electricity rate of 14.9¢ per kWh (EIA Wisconsin residential average for 2026-06: 19.56¢; U.S. average 18.34¢), below the national average, so payback is slower even with this calculator's 2.5% annual rate-increase assumption.
A typical 6kW solar system in Madison produces approximately 6,658 kWh per year, saving homeowners an estimated $993 annually. The system pays for itself in about 16.6 years, after which you enjoy essentially free electricity for the remaining 8+ years of the system's warranty life.
JouleIO's dataset carries a modeled solar-adoption value of 0.7% for Madison. It is a rough planning placeholder, not a measured count of local installations, so use utility interconnection data or installer quotes if local adoption matters to your decision.
Other Cities in Wisconsin
Appleton, WI
Eau Claire, WI
Green Bay, WI
Kenosha, WI
Milwaukee, WI
Oshkosh, WI
Racine, WI
Methodology & Solar Data Sources for Madison
How we calculate Madison solar potential and savings: Annual production = system kW × estimated peak sun hours × 365 × 0.80 system derate × a roof-orientation factor. This is a simplified planning formula, not a PVWatts run for your address. Cost uses a planning price per watt for Wisconsin, and bill savings use a planning electricity rate of 14.9¢/kWh (the EIA Wisconsin residential average for 2026-06 is 19.56¢/kWh).
- Peak sun hours for Madison (3.8/day) are a planning estimate in the typical range for Wisconsin, not a site-specific NREL NSRDB value. Enter your address in NREL PVWatts for a location-specific production estimate.
- System sizing defaults to a 6kW residential rooftop system with roughly 400W panels; adjust the size and monthly bill to match your home.
- Federal tax credit: modeled as 0% for 2026 residential installations because IRS guidance says the Residential Clean Energy Credit is not available for property placed in service after December 31, 2025.
- Exports are discounted rather than credited 1:1 at retail, because many utilities have shifted to net billing or avoided-cost export rates. Verify your utility's current tariff.
- 25-year savings assume a 2.5% annual electricity-rate increase and do not subtract panel degradation, inverter replacement, or maintenance.
Authoritative US solar data sources:
- NREL PVWatts Calculator, official US solar production estimator
- NREL National Solar Radiation Database, site-level solar irradiance data for checking your address
- IRS Residential Clean Energy Credit, 2026 federal residential credit status
- IRS One Big Beautiful Bill provisions, clean energy credit expiration overview
- DSIRE, State Solar Incentives, searchable database for Wisconsin
- EIA Electric Power Monthly Table 5.6.A, Wisconsin residential average price
- ENERGY STAR Solar, efficient solar product database
Solar Disclaimer: Solar savings vary based on roof orientation, shading, system quality, installer markup, financing terms, utility rate plan, and policy changes. Always get 3+ quotes from NABCEP-certified installers and review contracts carefully. Tax credit eligibility depends on tax liability, consult a tax professional.
Reviewed by Marcus Delacroix · Last updated 2026 · Sun-hour and rate inputs are planning estimates; EIA state rate period 2026-06
Frequently Asked Questions
How much do solar panels cost in Madison, WI?
The average cost of a 6kW solar panel system in Madison is approximately $16,500 before local or state incentives ($2.75/watt). For 2026 planning, this calculator does not subtract a federal residential clean energy credit because IRS guidance says the credit is not available for property placed in service after December 31, 2025. Wisconsin Focus on Energy rebates; net metering at full retail
How many solar panels do I need in Madison, WI?
A typical 6kW residential solar system in Madison needs about 15 panels if each panel is rated near 400 watts. That system produces about 6,658 kWh per year in this estimate, or roughly 1,110 kWh per installed kW before shading, roof orientation, and inverter losses are customized.
How many peak sun hours does Madison get?
JouleIO models Madison, WI at about 3.8 peak sun hours per day and roughly 174 sunny days per year. These are planning estimates, not site measurements, so check your exact address in NREL PVWatts. While below the national average, solar panels can still provide significant savings due to advancing panel technology.
What is the solar payback period in Madison?
The average solar payback period in Madison is approximately 16.6 years for a 6kW cash-price estimate before local or state incentives. After payback, your solar panels generate essentially free electricity for the remaining warranty life. Over 25 years, bill savings can reach about $33,919 before subtracting installation cost.
Does Madison have net metering?
JouleIO's planning data marks net metering or a solar export credit as available in Madison, where Madison Gas & Electric (MGE) is the likely utility (verify for your address). Export credits may be at retail or below-retail rates depending on the current tariff, and fixed monthly charges still apply.
Is solar worth it in Madison, WI in 2026?
Solar may still be worthwhile in Madison, especially for homeowners with high usage or strong local incentives, but the 16.6-year payback means quote comparison matters. For 2026 installs, JouleIO does not assume a federal residential credit; local incentives and net metering are the main financial drivers.