Solar Calculator for Wisconsin: Costs, Incentives & ROI
Wisconsin homeowners evaluating solar will find the state's solar economics are shaped by an unusual regulatory structure that sets it apart from most US states: Wisconsin does not have a single, uniform statewide net metering policy. Instead, each of the five major investor-owned utilities — We Energies, Madison Gas and Electric, Xcel Energy Wisconsin, Wisconsin Public Service, and Alliant Energy's Wisconsin Power and Light — files separate tariffs with the Wisconsin Public Service Commission, with compensation rates and structures that vary utility by utility. For most Wisconsin solar customers, compensation for exported electricity is generally at or near the retail rate, but the specifics vary: We Energies, which serves the Milwaukee metro and southeastern Wisconsin and covers approximately thirty-eight percent of the state's residential customers, applies a distribution charge reduction from exports that effectively reduces net compensation to approximately eighty-five percent of the retail rate. Madison Gas and Electric, serving Madison and Dane County, offers what is historically considered the most generous NEM structure in Wisconsin, with full retail-rate credit. Xcel Energy Wisconsin, Wisconsin Public Service, and Alliant Energy's Wisconsin Power and Light customers generally receive net metering at or near retail rates with monthly true-up schedules. Homeowners should verify their specific utility's current tariff terms before sizing a system, as these tariffs can be revised in PSC proceedings. Beyond the utility-specific net metering landscape, Wisconsin also presents a nuanced property tax situation. Wisconsin Statute Section 70.111(18) exempts solar energy systems from personal property tax — but residential solar installations typically fall under real property assessment, which does not carry a statewide exemption. Sales tax is more straightforward: solar equipment qualifies for a sales and use tax exemption under Wisconsin Statute Section 77.54(46m), providing meaningful upfront savings. Despite the complexity, Wisconsin's solid Great Lakes solar resource — approximately four to four and a half peak sun hours per day in Milwaukee — and the thirty-percent federal Investment Tax Credit make solar installations financially sensible for many homeowners who understand the utility-specific landscape and target self-consumption over maximum grid exports.
Incentive data updated: May 2026(may be outdated)
Average Solar Cost in Wisconsin
Average installed solar costs in Wisconsin typically range from $2.80 to $3.10 per watt before incentives, consistent with upper-Midwest pricing. A standard six-kilowatt residential system costs approximately seventeen thousand to eighteen thousand five hundred dollars before the federal Investment Tax Credit — generally above Sun Belt markets like Arizona and Texas, reflecting Wisconsin's shorter installation season and somewhat higher labor costs. The thirty-percent federal ITC reduces net installed cost to roughly eleven thousand nine hundred to twelve thousand nine hundred fifty dollars. Wisconsin does not offer a statewide solar rebate program or state solar tax credit, making the federal ITC the primary financial incentive. Sales tax on solar equipment is exempt under Wis. Stat. § 77.54(46m), providing immediate upfront savings of approximately six percent of equipment cost. Property tax treatment adds complexity: the personal property tax exemption under § 70.111(18) is real, but residential solar is typically assessed as real property, for which Wisconsin provides no statewide exemption. Homeowners should consult their county assessor's office to understand local assessment practices. Wisconsin's competitive installation market — with active NABCEP-certified installers in Milwaukee, Madison, Green Bay, and the Fox Valley — typically delivers multiple competitive bids when homeowners request three or more quotes.
- Avg. installed cost
- $2.95/W
- Typical 6 kW system
- $17,000–$18,500
Top Solar Incentives in Wisconsin
Live incentive data not currently available for Wisconsin. See the federal incentive guidance via our Solar Tax Credit Calculator.
Electricity Rates in Wisconsin
Wisconsin residential electricity rates average approximately thirteen to fifteen cents per kilowatt-hour, mid-tier nationally. Rate structures vary across the five major IOUs: We Energies uses tiered and TOU rates in the fourteen-to-seventeen-cent range; Madison Gas and Electric uses tiered rates in the fourteen-to-sixteen-cent range; Xcel Energy Wisconsin applies flat rates in the thirteen-to-fifteen-cent range; Wisconsin Public Service uses tiered rates in the fourteen-to-sixteen-cent range; and Alliant Energy / WPL uses tiered rates in the thirteen-to-fifteen-cent range. In MGE territory, full retail-rate net metering means exports earn the full thirteen-to-sixteen-cent value. In We Energies territory, the distribution charge reduction from exports means effective compensation is approximately eighty-five percent of retail — making self-consumption slightly more valuable. Across all utilities, the approximately fourteen-cent average retail rate — compared to Sun Belt rates of ten-to-twelve cents — improves Wisconsin's solar ROI relative to its resource. Homeowners who optimize for daytime self-consumption through EV charging, home office loads, or battery storage will extract the strongest economics regardless of utility served.
Peak Sun Hours in Wisconsin
Wisconsin's solar resource is moderate, reflecting its upper-Midwest latitude. Milwaukee at approximately forty-three degrees north receives approximately four to four and a half peak sun hours per day. Madison receives comparable resource; Green Bay in northeastern Wisconsin receives approximately four peak sun hours, somewhat reduced by greater cloud cover near Lake Michigan. Wisconsin's winters bring meaningful production reductions compared to summer, and light snow cover may occasionally require panel clearing. A six-kilowatt system in Milwaukee typically produces sixty-five hundred to seven thousand kilowatt-hours per year — lower than Sun Belt states but sufficient to offset a significant share of Wisconsin household electricity consumption. Self-consumption planning during peak summer months is particularly important given the seasonal production rhythm. Wisconsin's solar resource, while not exceptional, combines with a fourteen-cent average retail rate to produce system economics meaningfully better than states with similarly moderate solar resources but lower electricity rates.
Example ROI for a 6 kW System
- Estimated annual savings
- $900
- Payback period
- 10.0 years
- 25-year net savings
- $23,000
Run a personalized estimate with your ZIP code using the Solar ROI Calculator.
Major Cities in Wisconsin
- Milwaukee53202
- Madison53703
- Green Bay54301
- Kenosha53140
- Racine53401
Common Questions About Solar in Wisconsin
Why do solar net metering rates vary by utility in Wisconsin?
Wisconsin does not have a single, statewide net metering law that mandates a uniform compensation rate for all utilities. Instead, each investor-owned utility — We Energies, Madison Gas and Electric, Xcel Energy Wisconsin, Wisconsin Public Service, and Alliant Energy's Wisconsin Power and Light — files its own solar compensation tariff with the Wisconsin Public Service Commission, and the PSC approves these tariffs through individual utility proceedings. This means the rate you receive for exported solar electricity depends entirely on which utility serves your home. Historically, the five major Wisconsin IOUs have generally provided net metering at or near the retail rate under PSC requirements, but the structures differ: We Energies applies a distribution charge reduction from export credits, effectively reducing net export compensation to approximately eighty-five percent of the retail rate. Madison Gas and Electric has historically offered full retail-rate net metering — the most favorable structure among Wisconsin's major IOUs. Xcel Energy Wisconsin, Wisconsin Public Service, and Alliant Energy's WPL have generally provided net metering at retail rates with monthly true-up schedules. These tariffs can change in future PSC proceedings, so Wisconsin homeowners should verify current terms directly with their utility before finalizing system sizing.
We Energies vs Madison Gas and Electric vs Xcel — which has the best solar net metering in Wisconsin?
Among Wisconsin's five major IOUs, Madison Gas and Electric serving Madison and Dane County has historically been considered the most favorable for solar net metering, offering full retail-rate credit for exported electricity. Customers in MGE territory can effectively treat the grid as a virtual battery, earning the full retail rate — approximately fourteen to sixteen cents per kilowatt-hour — for every kilowatt-hour their system exports. We Energies, serving the Milwaukee metro and southeastern Wisconsin, is somewhat less favorable due to its distribution charge reduction from export credits, which effectively reduces net compensation to approximately eighty-five percent of the retail rate. Xcel Energy Wisconsin, Wisconsin Public Service, and Alliant Energy's Wisconsin Power and Light have generally provided retail-rate net metering with monthly true-up schedules, making them comparable to MGE in most cases. However, solar tariffs can change through PSC proceedings — the gap between utilities may narrow or widen over time. Wisconsin homeowners should verify current net metering terms directly with their utility before making installation decisions, as these tariffs are utility-specific and subject to PSC revision.
Does Wisconsin exempt solar from property tax?
Wisconsin's property tax situation for solar is genuinely complicated, and homeowners should understand the distinction carefully. Wisconsin Statute Section 70.111(18) exempts solar energy systems from personal property tax — this is a real exemption, but it applies to a category of property that typically does not include residential solar panels. Residential solar installations are generally assessed as real property improvements to a home, not as personal property, and Wisconsin does not provide a statewide exemption from real property tax assessment for solar. This means that when a county assessor reassesses a home — which may occur after a sale or on a regular assessment cycle — solar panels can be included as improvements that increase the home's assessed value, potentially adding to annual property tax obligations. The practical impact varies by county: some Wisconsin assessors do not routinely add solar value to assessments, while others do. Wisconsin does not have a statute analogous to Michigan's Public Act 92, which explicitly exempts solar from real property assessment statewide. Homeowners should consult their county assessor's office about local assessment practices before installing solar. As a positive offset, solar equipment is exempt from Wisconsin sales and use tax under Wis. Stat. § 77.54(46m), saving approximately six percent on equipment purchases.
Is solar equipment sales-tax exempt in Wisconsin?
Yes — Wisconsin exempts residential solar energy equipment from sales and use tax under Wisconsin Statute Section 77.54(46m). This exemption applies to solar photovoltaic panels, inverters, racking, and associated equipment purchased for residential solar installations. The exemption reduces upfront system costs by approximately six percent of equipment value, providing meaningful savings at point of purchase. Unlike the property tax situation — where the personal property exemption under § 70.111(18) does not typically apply to residential solar assessed as real property — the sales tax exemption is clear and broadly applicable to residential solar equipment purchases. Wisconsin homeowners should provide their installer with the relevant statute citation to ensure the exemption is properly applied to their system purchase. Battery storage systems paired with solar may also qualify for the exemption if the primary function is storing solar-generated electricity — consult with your installer or a Wisconsin tax professional for current guidance on storage eligibility.
Do I need a Master Electrician for solar installation in Wisconsin?
Yes — Wisconsin requires specific professional licenses for solar installation electrical work. The Wisconsin Department of Safety and Professional Services (DSPS) regulates electrical contractors in the state, and solar installations involving electrical work require both an Electrical Contractor license and a Master Electrician license from DSPS. Homeowners should verify their installer's license status at the DSPS online license lookup at dsps.wi.gov before signing a contract. Look for NABCEP-certified professionals as an additional quality indicator beyond the state licensing minimum — NABCEP's North American Board of Certified Energy Practitioners certification program tests solar-specific knowledge beyond general electrical licensing. Wisconsin's utility-specific net metering landscape makes proper system sizing particularly important: an installer who understands your specific utility's tariff structure — particularly whether you are in We Energies, MGE, Xcel, WPS, or Alliant territory — will be better positioned to size your system for optimal financial performance based on that utility's specific compensation rules.
Best Solar Installers in Wisconsin
Wisconsin requires solar installation electrical work to be performed by a licensed Electrical Contractor and a Master Electrician, both licensed through the Wisconsin Department of Safety and Professional Services (DSPS). Verify your installer's license status at the DSPS online license lookup at dsps.wi.gov before signing a contract. Look for NABCEP-certified professionals as an additional quality indicator beyond the state licensing minimum. Wisconsin's utility-specific net metering landscape makes proper system sizing critical — confirm your installer understands the specific NEM tariff terms for your utility (We Energies, MGE, Xcel, WPS, or Alliant) before finalizing system size and expected payback projections.
- Get at least 3 quotes from different installers to compare pricing and equipment.
- Check installer ratings with the BBB before signing a contract.
- Verify contractor licensing with Wisconsin Department of Safety and Professional Services (DSPS) — Electrical Contractor license + Master Electrician license. Ask for proof of a 20–25 year panel warranty.
Top Utility Companies in Wisconsin
We Energies (WEC Energy Group)
Service area: Milwaukee, Waukesha, Racine, Kenosha, southeastern Wisconsin
Tariff: tier-2, TOU
Residential rate: 14.0–17.0¢/kWh (as of 2026-05)
NEM program: We Energies NEM — retail rate with distribution charge reduced from export credits; effective ~85% retail compensation. WI PSC utility-specific tariff filing. Residential cap 20 kW typical.
Madison Gas and Electric (MGE)
Service area: Madison, Dane County, Middleton, Sun Prairie, Fitchburg
Tariff: tier-2
Residential rate: 14.0–16.0¢/kWh (as of 2026-05)
NEM program: MGE NEM at full retail rate — most generous Wisconsin NEM structure historically. WI PSC utility-specific tariff filing. Consult MGE for current terms.
Xcel Energy Wisconsin
Service area: Eau Claire, La Crosse, western Wisconsin
Tariff: flat
Residential rate: 13.0–15.0¢/kWh (as of 2026-05)
NEM program: Xcel Wisconsin NEM at retail rate; monthly true-up. WI PSC utility-specific tariff filing. Residential cap 20 kW typical.
Wisconsin Public Service (WPS)
Service area: Green Bay, Appleton, Marinette, northeastern Wisconsin
Tariff: tier-2
Residential rate: 14.0–16.0¢/kWh (as of 2026-05)
NEM program: WPS NEM at retail rate; monthly true-up. WI PSC utility-specific tariff filing. Residential cap 20 kW typical.
Alliant Energy / Wisconsin Power and Light (WPL)
Service area: Beloit, Janesville, Oshkosh, central + southern Wisconsin
Tariff: tier-2
Residential rate: 13.0–15.0¢/kWh (as of 2026-05)
NEM program: Alliant Energy (WPL) NEM at retail rate. WI PSC utility-specific tariff filing. Residential cap 20 kW typical.
Net Metering Policy in Wisconsin
- Version
- NEM NEM-1.0
- Effective date
- 1992-01-01
- Buyback rate
- retail
- System size cap
- 20 kW
- Grandfathering
- Per-utility grandfathering varies; consult your specific IOU for transition policies as PSC dockets can revise tariff terms
Wisconsin NEM is utility-specific — each of the five major investor-owned utilities (We Energies, Madison Gas and Electric, Xcel Energy Wisconsin, Wisconsin Public Service, and Alliant Energy / WPL) files separate tariffs with the Wisconsin Public Service Commission. Compensation rates and structures vary by utility (typically ~85–100% of retail rate). MGE is historically most generous (full retail). We Energies applies distribution charge reduction from exports (~85% effective retail). Xcel WI, WPS, and Alliant generally provide retail-rate NEM with monthly true-up. Residential cap typically 20 kW. Tariffs subject to PSC revision in future utility proceedings — consult your specific utility for current terms.
Property Tax Exemption in Wisconsin
- Status
- partial
- Applies to
- solar-pv
Wisconsin Wis. Stat. § 70.111(18) exempts solar energy systems from PERSONAL property tax. However, residential solar installations typically fall under REAL property assessment, which does NOT have a statewide exemption in Wisconsin. Some municipalities may offer local property tax incentives — consult your county assessor before installation. The personal property exemption does NOT apply to most residential solar. Sales tax IS exempt under § 77.54(46m) for residential solar equipment.