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Investor-owned utility

Superior Water, Light & Power (SWL&P) interconnection application

Superior Water, Light & Power (SWL&P) is an investor-owned utility serving 13,290 residential customers in Wisconsin (EIA-861, 2025). Gridpol files Superior Water, Light & Power (SWL&P) 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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Partly researched from official sources. verify on first project: swlp.com has no interconnection page and SWL&P is not on the PSC DG points-of-contact list; confirm submission channel (email/mail/contact), any utility-specific forms, PSC 119 review timelines, storage rules.

Superior Water, Light & Power (SWL&P) at a glance

Utility

Superior Water and Light Co (ALLETE)

Type

Investor-owned utility

EIA utility ID

18336

Residential customers

13,290 (EIA-861, 2025)

Net-metered residential customers

none reported

Service territory

1 county in Wisconsin

Who submits

Applicant = legally responsible person applying (PSC 119.02(2)); Form 6031 has representative and installing-contractor sections. Per PSC, obtain forms from the utility and submit directly to it. Utility-specific submission channel (email/mail) not published.

Export compensation

Net billing – SWL&P Electric - Parallel Generation 20 kW or less (Schedule COGS-NM, sheets E39-E41); Customer Owned Generation >20 kW (COGS-PG, E42-E44)
<=20 kW renewable: monthly netting; net monthly excess credited at avoided-cost rates (e.g. secondary $0.1457 on-peak / $0.0335 off-peak / $0.0729 avg, + PCAC; eff. 1/1/2025); pre-2018 customers grandfathered at retail until 12/31/2027. Credit <=$100 carried forward, >$100 refundable by check on request. >20 kW: $10 customer charge, paid avoided cost for all energy delivered; negotiated rates allowed. Signed contract and $300,000 liability insurance (<=20 kW) / $1,000,000 (>20 kW) required; owner pays interconnection costs. Also Superior Solar community solar.

Review time (official)

PSC 119 timelines not extracted (Wis. legislature site unreachable). Form 6029: utility testing within 10 working days after completion notice; if waived, interconnect on notice or after 5 working days; revised application decided within 20 working days.

Documents Superior Water, Light & Power (SWL&P) asks for

  • Interconnection application formWisconsin Standard DG Application Form 6031 (eff. 5/1/2024), submitted directly to the electric provider with fees (PSC 119.04(2)); signed by applicant and project designer/engineer Gridpol prepares this.
  • Other utility-specific documentTechnology-based supplement + manufacturer spec sheets (Solar PV Supplement; Energy Storage Supplement if battery)
  • Single-line diagram (one-line)One-line schematic incl. DG equipment, disconnect (if required), point of interconnection, meters, protection (Form 6031 item 14b) Gridpol prepares this.
  • Site plan / site layoutSite plan with equipment, service entrance, meters, DG/interface/protection equipment, disconnect location, street name/address (14c) Gridpol prepares this.
  • Proof of insuranceProof of insurance (14d); PSC Table 119.05-1 minimum: Cat 1 $300,000, Cat 2 $1,000,000, Cat 3 $2,000,000, Cat 4 negotiated
  • UL 1741 / IEEE 1547 certificationProof of equipment certification (e.g. UL 1741) or compliance with PSC 119.27 (14e)
  • Interconnection agreementForm 6029 (<=20 kW) or 6030 (>20 kW-15 MW), signed before parallel operation

How the Superior Water, Light & Power (SWL&P) process runs

  1. Contact the utility for its current application and interconnection agreement forms (PSC: online forms are informational).
  2. Submit Form 6031 + technology supplement(s), one-line diagram, site plan, proof of insurance, equipment certification and application fee directly to the utility.
  3. Utility completeness/engineering review per PSC 119; utility approves the application.
  4. Sign interconnection contract/agreement (Form 6029/6030; tariff requires signed contract) before parallel operation; ratchet removed / net-capable metering installed (COGS-NM).
  5. Install; applicant notifies utility in writing that installation is complete and equipment is available for testing.
  6. Utility commissioning test within 10 working days; if utility waives testing, applicant may interconnect on utility notification or 5 working days after its completion notice (Form 6029 sec. 7).

Fees

FeeApplies toNote
$150Category 1, 1-8 kW export capacityApplication review fee, PSC Table 119.08-1 (Form 6031); engineering review/study cost based; commissioning fee $150
$300Category 1, 9-20 kWApplication review fee; commissioning $150
$300 + $10/kWCategory 2, >20-200 kWApplication review fee; commissioning $250; engineering/study cost based
$2,000 + $2/kWCategory 3, >200 kW-1 MWCommissioning $1,000
$4,000 + $0.50/kWCategory 4, >1-15 MWCommissioning $2,500

Utility fees are paid by the installer or customer; they are not part of the Gridpol plan.

Size levels and limits

LevelUp toNote
Category 120 kWPSC 119
Category 2200 kW
Category 31000 kW
Category 415000 kW
Net metering cap20 kW

PSC 119 applies to DG <=15 MW AC. SWL&P tariff: COGS-NM net energy billing for <=20 kW (AC nameplate of generator/inverter); COGS-PG >20 kW sells at avoided cost or negotiated buy-back.

Storage, EV and stamps

Battery storage

PSC Energy Storage Supplement to Form 6031 required: nameplate kW/kWh, operating modes available/enabled, whether system exports and charges from grid, AC vs DC coupling. Utility-specific storage rules not published.

Sources

Wisconsin interconnection rule

Commission

Public Service Commission of Wisconsin

Interconnection rule

Wis. Admin. Code ch. PSC 119 (implements s. 196.496, Stats.) – Rules for Interconnecting Distributed Generation Facilities · source

Applies to

All electric public utilities (investor-owned and municipal utilities, which are public utilities under ch. 196) for DG facilities <=15 MW on their distribution systems. Electric cooperatives are not public utilities under ch. 196 and are not covered.

Application form

Statewide standard forms: Form 6031 Wisconsin Standard Distributed Generation Application (+ technology supplements: solar PV, wind, energy storage, generator, change of ownership); Form 6029 Interconnection Agreement (<=20 kW), Form 6030 (20 kW-15 MW); pre-application Forms 6032/6033 (all dated 2024-05-01)

Timelines

Utility furnishes guidelines and standard form within 5 working days of request; completeness notice within 10 working days of application + fee; application review within 10 working days of completeness (if no engineering review needed, applicant may install); applicant has 15 working days to accept engineering review estimate; engineering review 10/15/20/40 working days for Cat. 1/2/3/4; distribution study 10/15/20 working days (Cat. 1-3). Modifications: advance notice 20/40/60 working days; utility response 20/40/60/60 working days or deemed approved.

Fees

Table PSC 119.08-1: Cat. 1 $150 (1-8 kW) or $300 (9-20 kW); Cat. 2 $300 + $10/kW; Cat. 3 $2,000 + $2/kW; Cat. 4 $4,000 + $0.50/kW; engineering review and distribution study cost-based; commissioning fee $150/$250/$1,000/$2,500. Utility may waive.

Insurance

Minimum liability insurance per occurrence: Cat. 1 $300,000; Cat. 2 $1,000,000; Cat. 3 $2,000,000; Cat. 4 negotiated. Cat. 2-4 must name the utility as additional insured. Alternative financial responsibility by mutual agreement.

External disconnect

Utility may require a lockable, visible-break interconnection disconnect switch opening all ungrounded poles, accessible at all times and labeled 'Interconnection Disconnect Switch' (PSC 119.20(3)-(4)); one-line diagram and site plan must show the switch location.

Export compensation

Utility-specific – No statewide net metering statute; PSC-approved parallel generation / net metering tariffs of each utility
PSC: net metering available to customers of investor-owned and municipal utilities below a utility-specific size threshold; buyback rates set in each utility's parallel generation tariff.

Not bound by the rule

Municipal utilities are bound by PSC 119 and file PSC-approved tariffs. Electric cooperatives are not PSC-regulated public utilities and set their own interconnection and net metering/buyback policies.

Other utilities in Wisconsin

All Wisconsin utilities →

Gridpol Unlimited

$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
Get started

Applications are typically submitted within 2 business days after complete documents. Utility review times are set by each utility.

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