Order Now
Home›Solar Permit Drawings›Wisconsin Solar Permit Design
WI
🌲 Wisconsin⚡ Five Utilities. Five NEM Policies.

Wisconsin
Solar Permit Plans.
NEC 2017. No Two Utilities
Credit Solar the Same Way.

Wisconsin requires all utilities to offer net metering — but PSC ch. 119 sets the floor, not a uniform rate. Xcel Energy credits exports at the full retail rate. We Energies, Alliant, and Wisconsin Public Service credit monthly net excess at the avoided cost, roughly 3 to 4.2 cents per kWh against retail rates above 17 cents. Which utility serves a given address determines how much exported solar is worth — and that number ranges from retail rate to a fraction of it. Every Wisconsin plan set starts there.

NEC 2017 — ch. SPS 316 NEC 2023 update in final rulemaking Xcel 1:1 retail · We/Alliant/WPS ~3–4¢/kWh Focus on Energy rebates increased 2026 All 72 Counties
Order Wisconsin Plan Set →See the NEM Split ↓
NEC 2017ch. SPS 316 — current statewide
Xcel: 1:1 RetailBest NEM in Wisconsin
We/Alliant: ~3–4¢/kWhAvoided cost for monthly net excess
Focus on EnergyRebates increased for 2026
NEC 2017SPS 316 — statewide current
5 Utilities5 different NEM credit rates
Xcel Best1:1 retail — NW Wisconsin
Focus on EnergyRebates up in 2026
72 CountiesAll covered
✅
AHJ-ReadyBuilt to current AHJ requirements
⚡
24–48 HrsTypical residential turnaround
🔄
Free RevisionsFor AHJ-requested corrections
🌎
150+ PartnersSolar installers, EPCs & roofers
Wisconsin Solar Permits — 2026

Same NEC Statewide. Wildly Different Export Economics Depending on Your Utility.

Permit Design builds Wisconsin solar permit plan sets for solar installers, EPCs, and roofing companies across all 72 counties. The statewide electrical code is NEC 2017 under ch. SPS 316 of the Wisconsin Administrative Code — the Department of Safety and Professional Services (DSPS) has been updating to NEC 2023 through rulemaking, with a public hearing in March 2026 and the update taking effect the first day of the month following publication in the Wisconsin Administrative Register. Until that date, NEC 2017 governs every Wisconsin solar permit. Wisconsin also uses its own Uniform Dwelling Code (ch. SPS 320-325) for residential one- and two-family structures rather than adopting the IRC directly.

What makes Wisconsin complex for solar installers is not the code — it is the net metering patchwork. PSC ch. 119 requires all Wisconsin investor-owned and municipal utilities to offer net metering, but it does not mandate a uniform credit rate. Xcel Energy, which serves northwest Wisconsin, offers 1:1 retail rate credits — the best policy in the state. We Energies, Alliant Energy, and Wisconsin Public Service credit monthly net excess at the avoided-cost rate, typically 3 to 4.2 cents per kWh against retail rates above 17 cents. A system that performs well on paper in Xcel territory may take twice as long to pay back a few miles away under a different utility.

Last updated: June 2026 · NEC 2017 SPS 316 status, utility net metering tariffs, and Focus on Energy program confirmed as of June 2026.

Wisconsin Net Metering

Five Utilities. Five Credit Rates. One Project Address Determines Them All.

PSC denied Alliant Energy's and Madison Gas & Electric's proposals to eliminate net metering in March 2025 — but the rate a customer earns for exported solar still varies by a factor of six depending on which utility serves the address.

UtilityNet Metering PolicyExport Credit RateSystem Size CapKey Feature
Xcel Energy1:1 retail NEM — monthly rollover at retail rateFull retail (~16¢/kWh)100 kWBest in Wisconsin; credits expire annually on Jan 1
Madison Gas & Electric (MG&E)12-month rolling "net seller" determinationNear-retail if net importer; avoided cost if net seller over 12 months100 kWHighest retail rate in WI (~18.1¢/kWh); community solar available
We EnergiesMonthly net metering — avoided cost for net excess~$0.042/kWh for monthly net excess300 kWBidirectional meters from June 2025; rates up 8.58% in 2026
Alliant Energy (WPL)Monthly net metering — avoided cost for net excess~$0.03/kWh for monthly net excess20 kWFixed charge rising to $16/mo in 2026, $17/mo in 2027
Wisconsin Public Service (WPS)Monthly net metering — avoided cost for net excess~$0.03–0.04/kWh for monthly net excess20 kWSimilar to Alliant; serves Green Bay, Appleton, Oshkosh
The sizing implication is direct. For We Energies, Alliant, and WPS customers, every kilowatt-hour exported in excess of the month's consumption earns roughly 3–4 cents while the same kilowatt-hour would have offset consumption at 16–18 cents. Battery storage and self-consumption-oriented sizing close that gap — but the gap only exists in those utility territories. Xcel customers face no such penalty for modest oversizing. Permit Design identifies the correct Wisconsin utility before building the plan set so the interconnection documentation reflects the actual tariff.
Wisconsin Code Structure

NEC 2017 Statewide · Wisconsin UDC for Residential · NEC 2023 Update Pending

Wisconsin's code stack has one significant quirk: residential buildings use Wisconsin's own Uniform Dwelling Code rather than a direct IRC adoption. Both the electrical code and the residential building code have Wisconsin-specific amendments that differ from the base national published editions.

Electrical — All Structures
NEC 2017 (ch. SPS 316)
✓ SPS 316.007(1) — NEC 2017 by reference
✓ Wisconsin-specific amendments apply
✓ §690.12 array-boundary rapid shutdown
⚠ NEC 2023 update in final rulemaking
Residential Structural
Wisconsin Uniform Dwelling Code
✓ Ch. SPS 320–325 — Wisconsin-specific code
✓ Applies to 1–2 family dwellings
✓ Not a direct IRC adoption
✓ DSPS administers — not local AHJ for plan review
Commercial Structural
Wisconsin Commercial Building Code
✓ Ch. SPS 361–366
✓ IECC 2021 energy code — eff. Sept 1, 2025
✓ Commercial + multi-family structures
✓ ASCE 7 structural loads per project county
Wisconsin's NEC 2023 update — confirm status before submitting. The DSPS electrical code page shows the current SPS 316 edition. The NEC 2023 update rule takes effect on the first day of the month following its publication in the Wisconsin Administrative Register. Until that publication date, NEC 2017 governs. Wisconsin's northern counties carry notably higher ground snow loads — Northwoods counties like Vilas, Oneida, Iron, and Price see ASCE 7 ground snow loads significantly above what applies in the Milwaukee suburbs or the Driftless Area.
Wisconsin Utilities

Five Major IOUs, One Clear Winner on Net Metering

PSC ch. 119 mandates net metering for all Wisconsin IOUs and municipal utilities — but the credit rate each utility pays for monthly net excess generation differs materially. Utility identification drives the entire proposal economics.

UtilityTerritoryNet Excess CreditNotes
Xcel EnergyNorthwest Wisconsin — Hudson, River Falls, Eau Claire area; St. Croix Valley1:1 retail — best in state100 kW cap; credits rollover monthly at retail; paid out annually Jan 1
We EnergiesSoutheast Wisconsin — Milwaukee, Waukesha, Racine, Kenosha, Sheboygan~$0.042/kWh for monthly net excess300 kW cap; bidirectional meters from June 2025; rates up 8.58% in 2026
Alliant Energy (WPL)Central and western Wisconsin — Wausau, Appleton, La Crosse, Wisconsin Rapids~$0.03/kWh for monthly net excess20 kW cap; fixed charge $16/mo in 2026; PSC denied NEM elimination March 2025
Wisconsin Public Service (WPS)Northeast Wisconsin — Green Bay, Appleton, Oshkosh, Shawano~$0.03–0.04/kWh for monthly net excess20 kW cap; similar structure to Alliant
Madison Gas & Electric (MG&E)Dane County — Madison and surrounding communitiesNear-retail if net importer annually; avoided cost if net seller100 kW cap; ~18.1¢/kWh retail rate; community solar available; PSC denied NEM elimination
Focus on Energy: Wisconsin's statewide rebate program. All five major IOUs participate in Focus on Energy, the statewide program that offers cash rebates for residential and commercial solar. Focus on Energy increased its 2026 rebate levels specifically in response to the expiration of the federal Section 25D residential tax credit at the end of 2025. Rebate availability and funding windows vary by utility and program period — confirm current terms with Focus on Energy before including the rebate in any customer proposal.
What's Included

Wisconsin Solar Permit Plan Set Contents

Every Wisconsin plan set confirms the current SPS 316 NEC edition, references the Wisconsin Uniform Dwelling Code or Commercial Building Code as applicable, applies county-specific ASCE 7 snow and wind loads, and includes interconnection documentation formatted for the confirmed utility's specific net metering tariff.

Sheet 01
Cover Sheet
Current NEC edition citation (NEC 2017 via ch. SPS 316 or the NEC 2023 update if effective) with Wisconsin SPS 316 amendments noted. Wisconsin UDC (residential) or Wisconsin Commercial Building Code (commercial/multi-family) structural reference. Utility confirmed by project address — Xcel, We Energies, Alliant, WPS, or MG&E. Wisconsin electrical contractor credential reference.
Sheet 02
Site Plan
Dimensioned property diagram showing lot lines, metering point for the confirmed Wisconsin utility, emergency access routes, and wiring path from the array through the inverter into the panel. Project county noted for ASCE 7 lookup — Northwoods counties such as Vilas and Oneida carry ground snow loads well above what applies in Dane or Waukesha counties.
Sheet 03
Roof Layout
Panel placement diagram showing module layout, roof pitch, azimuth, and lag-point spacing referenced to Wisconsin UDC structural chapters. Fire setbacks documented per local AHJ requirements. Ground-to-roof snow conversion per ASCE 7 for the project county — northern Wisconsin's freeze-thaw cycles and ice dam exposure affect attachment spacing decisions that don't factor into southeastern Wisconsin projects.
Sheet 04
Single-Line Diagram
NEC 2017 Article 690 wiring diagram with Wisconsin SPS 316 amendments. Rapid shutdown per §690.12 — one-foot array boundary, module-level shutdown with up to six initiation devices per 2017 edition. Net metering interconnection shown for the confirmed utility: Xcel's 1:1 retail tariff, We Energies' buy-back rate, Alliant's parallel generation tariff, WPS PG-4 tariff, or MG&E's parallel generation PG-2 tariff.
Sheet 05
Structural Calculations
PE engineering stamp from a Wisconsin-licensed engineer confirming the roof framing or racking structure can carry the proposed array. Wisconsin UDC chapters govern residential framing; the Commercial Building Code governs multi-family and commercial. ASCE 7 tabulated snow and wind loads applied per county — Northwoods counties such as Vilas and Iron carry design values that differ significantly from the Milwaukee metro.
Sheet 06
Rapid Shutdown
NEC 2017 §690.12 rapid shutdown documentation — one-foot array boundary diagram, initiation device(s) identified with up to six permitted under the 2017 edition, §690.56(C) label format. Wisconsin SPS 316 amendments are reviewed for any Wisconsin-specific rapid shutdown modifications before finalizing this sheet. AHJ notified if the NEC 2023 update takes effect during the permit timeline.
Sheet 07
Equipment Datasheets
Manufacturer cut sheets covering modules, inverter, mounting system, and module-level power electronics — all UL-listed and arranged per the interconnection submission requirements of the confirmed Wisconsin utility. Net metering tariff reference noted: Xcel's Net Energy Billing Service (Pg-1), We Energies' Customer Generation Rates, Alliant's Customer Interconnection tariff, WPS's PG-4 Net Energy Billing tariff, or MG&E's PG-2 Parallel Generation tariff. Focus on Energy rebate eligibility noted where applicable.
🏗️ Commercial Solar in Wisconsin

Also doing commercial rooftop, carport, or ground-mount in Wisconsin?

Wisconsin commercial solar packages reference the Wisconsin Commercial Building Code (SPS 361-366) with IECC 2021 energy code effective September 2025, and NEC 2017 (SPS 316) electrical. Utility-specific interconnection documentation for We Energies, Alliant, WPS, MG&E, or Xcel — each with its own net metering tariff and system size cap. Note that We Energies allows commercial net metering systems up to 300 kW while Alliant and WPS cap at 20 kW. Engineering covers standing-seam and ballasted flat-roof installations, parking canopy and carport structures, and ground-mount racking for fixed-tilt or single-axis tracker configurations. Custom scope and turnaround quoted per project.

NEC 2017 (SPS 316) Wisconsin Commercial Code 5 Utility NEM Tariffs Focus on Energy Eligible
Commercial Quote →
Scope + turnaround quoted per project
Process

How Wisconsin Solar Permit Plan Sets Work

01

Submit Your Wisconsin Project

Give us the county and address. We confirm the specific Wisconsin utility — Xcel, We Energies, Alliant, WPS, or MG&E — since each operates a different net metering tariff. We also verify the current SPS 316 NEC edition status and whether the Wisconsin UDC or the Commercial Building Code structural provisions apply to the structure type.

02

Built to NEC 2017 + Confirmed Utility

NEC 2017 Article 690 electrical documentation with SPS 316 Wisconsin amendments. Wisconsin UDC structural for residential or Wisconsin Commercial Building Code for multi-family and commercial. County-specific ASCE 7 snow and wind values — Northwoods counties get their own calculations, not averaged with Milwaukee. Wisconsin-licensed PE stamp on all structural sheets.

03

Delivered in 24–48 Hours

The full 7-sheet Wisconsin package ships in 24–48 hours. Every sheet reflects the confirmed utility's net metering tariff — Xcel's 1:1 retail, We Energies' buy-back rate, Alliant's parallel generation, WPS PG-4, or MG&E PG-2 — so the interconnection application is formatted correctly from the start. Free revisions until your Wisconsin AHJ approves.

First-Time Wisconsin Clients

Try Us on Your First Wisconsin Project. Free.

New to Permit Design? Send over your first Wisconsin residential project and we'll put together the full 7-sheet package at zero cost — NEC 2017 electrical with SPS 316 amendments, Wisconsin UDC structural with county ASCE 7 snow loads, and interconnection documentation matched to the confirmed utility and its specific net metering tariff.

⚠️ For licensed solar installers, EPCs, and roofing companies only. Individual homeowners and residential end customers are not eligible. One free residential plan set per company.

Claim Your Free WI Plan Set →
✓ NEC 2017 — SPS 316 with WI amendments
✓ Wisconsin UDC structural + PE stamp
✓ County snow loads — Northwoods vs southern WI
✓ Utility NEM tariff confirmed by address
✓ Free revisions until AHJ approval
FAQ

Wisconsin Solar Permit Design — Frequently Asked Questions

NEC 2017. Wisconsin's electrical code, ch. SPS 316, incorporates NEC 2017 by reference under SPS 316.007(1). The DSPS held a public hearing on the NEC 2023 update in March 2026, and the rule takes effect the first day of the month following publication in the Wisconsin Administrative Register. Until that date passes, NEC 2017 governs all Wisconsin solar permits.
Yes, but the credit rate depends entirely on your utility. PSC ch. 119 requires all Wisconsin IOUs and municipal utilities to offer net metering, but does not set a uniform credit rate. Xcel Energy credits net excess at the full retail rate. We Energies credits monthly net excess at approximately $0.042/kWh. Alliant Energy and Wisconsin Public Service credit monthly net excess at approximately $0.03/kWh. Madison Gas and Electric uses a 12-month net seller determination. The utility serving the project address is the most important factor in any Wisconsin solar savings model.
Xcel Energy. Xcel Energy serves northwest Wisconsin — Hudson, River Falls, the St. Croix Valley, and portions of Eau Claire — and offers 1:1 retail net metering up to 100 kW. Monthly credits roll over at the full retail rate and any remainder is paid out January 1. This makes Xcel territory the most favorable for solar sizing in Wisconsin. Customers of We Energies, Alliant, and WPS earn avoided-cost rates for monthly net excess, which are 3 to 5 times lower than retail.
Approximately $0.042 per kWh for standard residential customers as of 2026 — compared to a blended retail rate of roughly 17.6 cents per kWh. We Energies raised residential rates 9.29% in 2025 and another 8.58% in 2026. The utility installed bidirectional meters for net metering customers starting June 1, 2025, eliminating the prior two-meter requirement. We Energies net metering is available for systems up to 300 kW, the highest cap among Wisconsin IOUs.
Wisconsin has five major IOUs: Xcel Energy (northwest), We Energies (southeast — Milwaukee metro), Alliant Energy / Wisconsin Power and Light (central and western Wisconsin), Wisconsin Public Service / WPS (northeast — Green Bay, Appleton, Oshkosh), and Madison Gas and Electric (Dane County, Madison). Each operates under its own PSC-approved net metering tariff with different credit rates and system size caps. Wisconsin also has several electric cooperatives and municipal utilities with their own PSC-approved programs.
Focus on Energy is Wisconsin's statewide energy efficiency and renewable energy program, funded by ratepayers and administered by the state's utilities under PSC direction. It provides cash rebates for residential and commercial solar. Focus on Energy raised its 2026 rebate levels after the PSC noted the expiration of the federal Section 25D residential tax credit at the end of 2025. Rebate amounts and availability vary by utility and program funding window — confirm current terms before including the rebate in any customer proposal.
The Wisconsin Uniform Dwelling Code (UDC), ch. SPS 320-325, governs one- and two-family dwellings. This is Wisconsin's own residential building code, not a direct IRC adoption, administered by DSPS. Commercial and multi-family structures fall under the Wisconsin Commercial Building Code (SPS 361-366). Structural calculations reference ASCE 7 wind and ground snow values per project county — northern Wisconsin counties carry significantly higher snow loads than the Milwaukee suburbs or the Driftless Area.
Yes. The Wisconsin PSC voted unanimously to preserve net metering for Alliant Energy customers in March 2025, and also denied Madison Gas and Electric's proposal to eliminate net metering. These decisions maintained the existing net metering framework for Wisconsin's two largest urban utility territories. The PSC has an open investigatory docket exploring the future of net metering statewide, including potential Value of Solar Study methodology.
Yes. Wisconsin offers a sales tax exemption on qualifying solar equipment, a property tax exemption preventing solar from increasing the assessed value of a home, and Focus on Energy cash rebates through participating utilities. Wisconsin has no state income tax credit for solar. The federal Section 25D residential clean energy credit is no longer available for Wisconsin systems placed in service after December 31, 2025.
Permit Design delivers Wisconsin solar permit plan sets within 24-48 hours. Every plan set confirms the current SPS 316 NEC edition, references the Wisconsin UDC or Commercial Building Code structural provisions, applies county-specific ASCE 7 snow and wind loads, and includes interconnection documentation formatted for the confirmed utility and its specific net metering tariff — Xcel, We Energies, Alliant, WPS, or MG&E. Free revisions until the Wisconsin AHJ approves.
Wisconsin Solar Market — 2026

Wisconsin Solar by the Numbers

3× Growth
Utility-Scale Solar 2023–2026
Wisconsin's solar generating capacity was on track to triple between November 2023 and January 2026, rising from 650 MW to over 2,000 MW as Alliant Energy completed its fleet of 12 utility-scale solar plants and NIPSCO-adjacent projects came online. The residential and commercial rooftop market is growing alongside this utility-scale expansion.
17–18¢
Average Retail Rate — Rising
Wisconsin homeowners paid an average of 17.84 cents per kWh at the end of 2025. Every major utility locked in PSC-approved rate increases for 2026 — We Energies alone added 8.58% in 2026 on top of 9.29% in 2025. Rising retail rates strengthen the self-consumption economics for We Energies and Alliant customers even as export credits remain near avoided cost.
$2.80–3.20
Per Watt Installed — 2026
A standard residential solar installation in Wisconsin runs approximately $2.80 to $3.20 per watt in 2026, putting a typical 6 kW system between $16,800 and $19,200 before incentives. Snow-load engineering requirements and the two-meter costs historically associated with We Energies interconnection (now resolved by bidirectional meters from June 2025) added cost in prior years.
Focus on Energy
2026 Rebates Increased
Wisconsin's statewide Focus on Energy program increased its solar rebate levels for 2026, specifically in response to the expiration of the federal Section 25D residential tax credit at the end of 2025. All five major Wisconsin IOUs participate. Rebates operate on a first-come, first-served basis within program funding windows — confirm availability before including in customer proposals.
Sales Tax Exempt
+ Property Tax Exemption
Wisconsin's sales tax exemption covers qualifying solar equipment at the point of purchase. The property tax exemption prevents the added value of a solar system from raising a home's assessed value — no separate application needed; it applies automatically statewide. No Wisconsin state income tax credit for solar exists.
72 Counties
Northwoods Snow Loads Are Real
Wisconsin's 72 counties range from Milwaukee's densely urban southeast to the sparsely populated Northwoods of Vilas, Oneida, and Iron counties, where ASCE 7 ground snow loads approach some of the highest in the Midwest. Every Wisconsin plan set calculates structural loads per the specific project county — Northwoods systems require materially different engineering than those in Dane or Waukesha counties.
Wisconsin AHJ Rejections

Top 3 Reasons Wisconsin Solar Permits Get Rejected

Three plan set issues account for the majority of Wisconsin delays across the state's mix of municipal and county building departments.

01
Wrong NEC Edition — 2020 or 2023 Applied Instead of 2017
Wisconsin is on NEC 2017 (ch. SPS 316) as of mid-2026. Installers moving between Wisconsin and neighboring states on NEC 2020 or 2023 sometimes carry the newer edition's formatting into Wisconsin projects — particularly the NEC 2023 single-device rapid shutdown format and §690.12(D) labeling, which doesn't match what Wisconsin AHJs expect under the 2017 edition's §690.56(C) layout.
ch. SPS 316.007(1) · NEC 2017 · §690.12
How we prevent it: We verify the current SPS 316 edition status before building every Wisconsin plan set. If the NEC 2023 update has taken effect, we switch to 2023 formatting; until it has, every Wisconsin plan set uses 2017 formatting.
02
Wrong Utility NEM Tariff in Interconnection Package
With five different Wisconsin IOUs each operating under a distinct net metering tariff name and format — Xcel's Pg-1, We Energies' Customer Generation Rates, Alliant's Customer Interconnection tariff, WPS's PG-4, and MG&E's PG-2 — submitting an interconnection package formatted for the wrong utility restarts the application clock. This is especially common near utility territory borders.
PSC ch. 119 · utility-specific NEM tariffs
How we prevent it: We verify the serving utility against the specific street address before drafting interconnection paperwork — zip codes and municipality names don't follow utility territory boundaries, so address-level confirmation is the only reliable method.
03
Northwoods Snow Load Underspecified
Wisconsin's northern counties — Vilas, Oneida, Iron, Price, Florence — carry ASCE 7 ground snow loads well above what applies in the Milwaukee suburbs or the Madison area. A structural calculation using southern-Wisconsin snow values for a Northwoods rooftop system will be flagged by the structural reviewer or the local building department.
ASCE 7 · Wisconsin UDC structural · county-specific loads
How we prevent it: Every Wisconsin structural calculation pulls ASCE 7 ground snow values for the specific project county. Northwoods counties receive their own verified load figures — never interpolated from a statewide average.
See all common plan set rejection causes → Residential Solar Permit Design →
🛡️

The Permit Design Commitment

What every solar installer, EPC, and roofing company can expect on every project.

✅ 24–48 Hour Turnaround on Standard Residential Solar Projects
✅ No-Cost Revisions for AHJ Corrections Related to Our Design
✅ Code-Compliant Plans Built to Current NEC, Utility & Local Requirements
✅ Support Through Permit Approval — We Don't Disappear After Delivery
⚡
Reviewed & Verified By PE-stamped plan sets across all 50 US states · utility NEM tariff confirmed by address, not zip code · Wisconsin SPS 316 NEC edition status verified per project
AHJ-ReadyPer confirmed code
150+Installer partners
50US states covered
5 UtilitiesAll WI tariffs covered
Permit SupportThrough AHJ approval
Last reviewed: June 2026·About Permit Design →
NEC 2017 (SPS 316)Wisconsin UDC5 Utility NEM TariffsFocus on Energy
Neighbouring States

Solar Permit Plan Sets — Midwest States

🌽IllinoisNEC 2023 🌊MinnesotaNEC 2020 🚗MichiganNEC 2023 🌾IowaNEC 2020 🏭IndianaNEC 2017

Wisconsin Solar Permits —
Right Utility. Right Tariff.

NEC 2017 · Wisconsin UDC · 5 IOU Tariffs Confirmed
Northwoods Snow Loads · Focus on Energy · 72 Counties · 24–48 Hours

Order Wisconsin Plan Set →Contact Us
First-time Wisconsin client? Your first residential plan set is on us. Mention "free trial" in your order notes.