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Investor-owned utilityWisconsin Public Service (WPS) interconnection application
Wisconsin Public Service (WPS) is an investor-owned utility serving 415,643 residential customers in Wisconsin (EIA-861, 2025). Applications: PDF + email (WPS customer-owned generation). Gridpol files Wisconsin Public Service (WPS) 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 Wisconsin Public Service (WPS)’s official sources (see below). ≤20 kW submission route assumed same contacts (no separate page found); PG rate terms not extracted.
Wisconsin Public Service (WPS) at a glance
Wisconsin Public Service Corp (WEC Energy Group)
TypeInvestor-owned utility
EIA utility ID20860
Residential customers415,643 (EIA-861, 2025)
Net-metered residential customers2,166 (EIA-861, 2025)
Service territory22 counties in Wisconsin
How to applyPDF + email – WPS customer-owned generation · official link
Who submitsCustomer of record / installer submits PSC Form 6031 by email customergen@wisconsinpublicservice.com or mail (WPS, Attn: Christine Behnke, 134 MacArthur Drive, Coleman WI 54112). Payments sent separately to We Energies, Essential Services A299, PO Box 2046, Milwaukee WI 53201-9627.
Review time (official)Status contact within 10 business days; engineering review determination within 10 business days.
Documents Wisconsin Public Service (WPS) asks for
- Interconnection application formWisconsin Standard DG Application Form 6031 Gridpol prepares this.
- Other utility-specific documentSolar PV / Energy Storage supplement forms
- Single-line diagram (one-line)Computer generated, PSC 119.10 (shared WEC COG manual) Gridpol prepares this.
- Site plan / site layoutComputer generated, PSC 119.12 Gridpol prepares this.
- Inverter spec sheetManufacturer data sheet (string inverter, microinverter or hybrid inverter).
- Photos (meter, main panel, equipment)Existing metering equipment photos
- Proof of insuranceper PSC 119 category
- Interconnection agreementSigned after commissioning with purchase agreement
How the Wisconsin Public Service (WPS) process runs
- Submit Form 6031 + supplements and documents by email/mail; pay fee separately
- Completeness (10 BD) and engineering review decision (10 BD)
- Pay upgrades
- Install, inspection
- Commissioning by Company
- Sign agreements; final acceptance
Fees
| Fee | Applies to | Note |
|---|---|---|
| $300 | Optional pre-application report | |
| per PSC 119 category | Application review | not stated |
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 | PSC 119 |
| Category 2 | 200 kW | |
| Category 3 | 1000 kW | |
| Category 4 | 15000 kW |
Same WEC COG manual as We Energies
Storage, EV and stamps
Battery storage
Same as We Energies manual: UL 9540, Energy Storage form, non-export means must be reviewed with test data.
EV chargers
EV chargers must be shown on one-line (WEC COG manual).
Common issues the utility lists
- Hand-drawn one-line/site plan not accepted (WEC manual)
- Equipment differing from submitted documents
Gridpol’s pre-submission check covers these before we file.
Sources
- WPS Systems greater than 20 kW: https://www.wisconsinpublicservice.com/environment/20kw-more-systems (retrieved 2026-11-13)
- We Energies/WPS Customer-Owned Generation Manual 04/13/2026: https://www.we-energies.com/services/pdf/cog-manual.pdf (retrieved 2026-11-13)
- WPS PG-1 tariff: https://www.wisconsinpublicservice.com/company/wi_tariffs/pg.pdf (retrieved 2026-11-13)
Other utilities in Wisconsin
- We Energies1,056,086
- Alliant Energy (Wisconsin)440,746
- 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.