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Investor-owned utilityAlliant Energy (Wisconsin) interconnection application
Alliant Energy (Wisconsin) is an investor-owned utility serving 440,746 residential customers in Wisconsin (EIA-861, 2025). Applications: PowerClerk (Alliant Energy Connect PowerClerk). Gridpol files Alliant Energy (Wisconsin) interconnection applications for licensed installers – solar, storage and EV chargers – with single-line diagram and site plan, unlimited for $500 a month.
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Process verified from Alliant Energy (Wisconsin)’s official sources (see below). PSC 119 application fee amounts not on page; storage specifics not extracted.
Alliant Energy (Wisconsin) at a glance
Wisconsin Power & Light Co (Alliant Energy)
TypeInvestor-owned utility
EIA utility ID20856
Residential customers440,746 (EIA-861, 2025)
Net-metered residential customers5,447 (EIA-861, 2025)
Service territory35 counties in Wisconsin
How to applyPowerClerk – Alliant Energy Connect PowerClerk · official link
Who submitsInstaller usually submits on customer's behalf; customer may apply via PowerClerk or by mail (Renewable Hotline, Cedar Rapids). Electric Service Provider on form must read Wisconsin Power and Light Company.
Export compensationNEM – PgS-3 (≤20 kW AC)
Meter netting; net overproduction credited at pricing-period rate (avg $0.04254/kWh as of 1/1/2026). PgS-1 >20 kW: export credited at low/regular/high rate.
Completeness within 10 working days; engineering review determination within 10 business days (PSC 119).
Documents Alliant Energy (Wisconsin) asks for
- Interconnection application formWisconsin Standard DG Application (Forms 6027/6028 in PowerClerk until Form 6031 incorporated) Gridpol prepares this.
- Proof of insuranceCat 1 ≤20 kW $300,000; Cat 2 $1M; Cat 3 $2M; Cat 2-4 must name WPL as additional insured
- Single-line diagram (one-line)Drawn by us from your equipment data: modules, strings, inverter, battery, disconnects, point of interconnection, meter. Gridpol prepares this.
- Site plan / site layoutPlot plan Gridpol prepares this.
- Inverter spec sheetManufacturer data sheet (string inverter, microinverter or hybrid inverter).
- PV module spec sheetManufacturer data sheet of the modules.
- Recent electric bill (when applicable)Usage history
- Interconnection agreementSigned before operation
- Other utility-specific documentTest results at commissioning
How the Alliant Energy (Wisconsin) process runs
- Research/usage history
- Submit via PowerClerk (design check in DG Assist)
- Completeness (10 working days)
- Engineering review decision (10 BD); study/upgrades if needed
- Interconnection Approval Memorandum → install
- Notify Alliant, pay commissioning fee, submit test results, witness test
- Sign Interconnection Agreement → Permission to Operate notice
Fees
| Fee | Applies to | Note |
|---|---|---|
| $300 | Pre-application (Form 6032 + NDA, by email) | |
| quoted | Engineering review, study, commissioning fee |
Utility fees are paid by the installer or customer; they are not part of the Gridpol plan.
Size levels and limits
| Level | Up to | Note |
|---|---|---|
| Category 1 | 20 kW | |
| Category 2 | 200 kW | |
| Category 3 | 1000 kW | |
| Category 4 | 15000 kW | |
| Net metering cap | 20 kW |
PgS-3 net billing ≤20 kW AC; PgS-1 >20 kW to 5,000 kW
Storage, EV and stamps
Battery storage
Not addressed on page; Alliant DER Technical Interconnection Requirements apply.
Common issues the utility lists
- Incomplete application returned
- Unsigned documents
- Missing payment
- Missing usage history
- Component swaps without notice / non-UL
- Constant PF instead of Volt-VAR slows review
Gridpol’s pre-submission check covers these before we file.
Sources
- Alliant Energy Customer Interconnection – Wisconsin: https://www.alliantenergy.com/ways-to-save/customer-interconnection/wisconsin (retrieved 2026-11-13)
- WPL Wisconsin electric schedule of rates: https://www.alliantenergy.com/-/media/alliant/documents/accountandbilling/ratesandtariffs/wisconsinelectricrates/wisconsinelectricscheduleofrates.pdf (retrieved 2026-11-13)
Other utilities in Wisconsin
- We Energies1,056,086
- Wisconsin Public Service (WPS)415,643
- Xcel Energy (Wisconsin/Michigan)222,746
- MGE148,482
- Adams-Columbia Electric Cooperative36,159
- Polk-Burnett Electric Cooperative20,584
- Barron Electric Cooperative19,395
- Riverland Energy Cooperative19,120
- Oakdale Electric Cooperative17,139
- Sun Prairie Utilities17,082
$500 / month
Unlimited interconnection applications. 12-month agreement, signed online. The agreement starts the day you sign; first invoice right away, then monthly.
- Unlimited interconnection applications
- Single-line diagram and site plan for every application
- Pre-submission check against the utility’s requirements
- Homeowner e-signature link for the authorization
- Filing in your utility portal accounts or by the utility’s method
- Utility questions, corrections and resubmissions
- Follow-up through approval, inspection and PTO
- Customer list, exports, API and webhooks
Applications are typically submitted within 2 business days after complete documents. Utility review times are set by each utility.