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Investor-owned utilityMGE interconnection application
MGE is an investor-owned utility serving 148,482 residential customers in Wisconsin (EIA-861, 2025). Applications: PowerClerk (MGE DG PowerClerk). Gridpol files MGE 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 MGE’s official sources (see below).
MGE at a glance
Madison Gas & Electric Co (MGE Energy)
TypeInvestor-owned utility
EIA utility ID11479
Residential customers148,482 (EIA-861, 2025)
Net-metered residential customers2,677 (EIA-861, 2025)
Service territory1 county in Wisconsin
How to applyPowerClerk – MGE DG PowerClerk · official link
Who submitsCustomer or installer; solar and/or storage ≤200 kW via PowerClerk; >200 kW and other technologies by email to mgeDGAdmin@mge.com. MGE advises contacting MGE early, before signing an installer contract.
Export compensationNEM – Pg-2 Net Metering (≤100 kW)
Exports credited at same $/kWh as energy charges; Net Sellers (trailing 12 mo, after first year) paid buyback rate. Pg-1 >100 kW.
Not stated on MGE page; PSC 119 timelines apply.
Documents MGE asks for
- Interconnection application formWisconsin Standard DG Application Form 6031 Gridpol prepares this.
- Other utility-specific documentSolar PV supplement and/or Energy Storage supplement
- Single-line diagram (one-line)Line diagram (sample one-lines on MGE site) Gridpol prepares this.
- Site plan / site layoutDrawn by us from your roof sketch or photos: array, inverter, battery, disconnect, meter and main panel locations. Gridpol prepares this.
- Inverter spec sheetSystem specifications
- Proof of insuranceProof of insurance certificate
- Photos (meter, main panel, equipment)Photo of electric meter showing clearances; proof-of-completion photos for ≤20 kW residential
- Interconnection agreementE-signed in PowerClerk after commissioning (<200 kW solar/battery); Forms 6029/6030 otherwise
How the MGE process runs
- Gather materials (Form 6031, supplements, SLD, site plan, specs, insurance, meter photo)
- Submit in PowerClerk (≤200 kW solar/storage)
- Mail application fee check
- MGE approval → order/install equipment
- Commissioning: ≤20 kW residential solar/battery = MGE reviews proof-of-completion photos; others inspection/testing; pay commissioning fee
- E-sign Interconnection Agreement in PowerClerk after insurance verified
- Operate after receiving countersigned agreement (PTO)
Fees
| Fee | Applies to | Note |
|---|---|---|
| $150 + $150 commissioning | Category 1, 1-8 kW export | Check payable to MGE, installation address in memo, mail to Cash Processing PO Box 1231 Madison WI 53701-1231 |
| $300 + $150 commissioning | Category 1, 9-20 kW | |
| $300 + $10/kW; $250 commissioning | Category 2 >20-200 kW | |
| $2,000 + $2/kW; $1,000 commissioning | Category 3 >200 kW-1 MW | |
| $4,000 + $0.05/kW; $2,500 commissioning | Category 4 >1-15 MW |
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 | external lockable visible-break disconnect |
| Category 2 | 200 kW | wye-wye transformer required ≥50 kW |
| Category 3 | 1000 kW | gross output monitoring |
| Category 4 | 15000 kW | |
| Net metering cap | 100 kW |
Downtown network: export prevented (MIR or <1/15 min daytime load)
Storage, EV and stamps
Battery storage
Storage ≤200 kW applies via PowerClerk with Energy Storage Supplement; same categories by export capacity.
Common issues the utility lists
- Check without installation address in memo is returned
- One check per installation address
Gridpol’s pre-submission check covers these before we file.
Sources
- MGE Connecting to Our Grid: https://www.mge.com/smart-energy/clean-energy/solar-energy/connecting-to-our-grid (retrieved 2026-11-13)
- MGE DG Interconnection Requirements Quick Reference (01/24/2024): https://www.mge.com/getmedia/c2392948-265c-4e05-9b01-67d889c0aa47/Solar-DG-Quick-Reference.pdf (retrieved 2026-11-13)
- MGE Net Metering: https://www.mge.com/smart-energy/clean-energy/solar-energy/net-metering (retrieved 2026-11-13)
- MGE Schedule Pg-2: https://mge.com/MGE/media/MGE-Library/documents/rates-electric/e11-2-0-SchedulePg-2-12302025.pdf (retrieved 2026-11-13)
Other utilities in Wisconsin
- We Energies1,056,086
- Alliant Energy (Wisconsin)440,746
- Wisconsin Public Service (WPS)415,643
- Xcel Energy (Wisconsin/Michigan)222,746
- 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.