Systems greater than 20kW

Installation steps for customer-owned generation agreements are determined by size. Systems with a capacity greater than 20 kilowatts (kW) are typical for large business and agriculture.

Owner and installer responsibilities

• Design, install, operate and maintain any generation system installed.
• Follow interconnection rules from Public Service Commission of Wisconsin (PSCW) and meet all WPS tariff requirements, applicable laws and regulations (local, state and federal).
  • Requirements are designed to: protect distribution system facilities; avoid electrical interference problems; ensure safety of customers, WPS employees and the general public; and maintain overall system reliability.
    Changes to guaranteed available short circuit current
  • Connections with a capacity of 15 megawatts (MW) or less must comply with Wisconsin Administrative Code Rules for Interconnecting Distributed Generation Facilities (PSC 119).
  • Customer and installer agree to address any existing issues with metering/service equipment to meet current requirements.
• Maintain liability insurance (equal to or greater than amounts indicated in PSC 119) or prove financial responsibility by another means agreeable to us.
• Notify us if a material modification is made to the generation facility at any time during or after the installation process. Material modifications are any modifications that change the maximum electrical output of a facility or change the interconnection equipment, including:
  • Changing from certified to noncertified devices.
  • Replacing a component with a component of different functionality or UL listing.
• Properly install, operate and maintain specified protective devices.
• Obtain authorizations, permits and licenses required for construction and operation of the generating facilities at your expense.
• Complete the steps for interconnection.

Our responsibilities

We will promptly carry out our role in the interconnection steps and meet all required timelines to process your interconnection application. We will assist you with any information you need to complete your interconnection.

Interconnection steps

These steps are required by state law to interconnect to our distribution system.

1. Email us with questions.
2. Review parallel generation rates.
   • No Purchase by WPS PG-1
   • Purchase by WPS PG-2A
   • Purchase by WPS PG-2B
   • Purchase by WPS PG-2C
3. Review and understand rules and requirements.
   • Customer-owned generation manual
   • WPS Parallel Generation Rules
   • Wisconsin Administration Code Rules (PSC 119)
   • Solar disconnect waiver for energy storage systems – effective June 1, 2025
4. Complete and submit application (send payments separately).
   Wisconsin Standard Distributed Generation Application
   
   Application address (mail or email)
   Wisconsin Public Service
   Attn: Christine Behnke
   134 MacArthur Drive
   Coleman WI 54112
   customergen@wisconsinpublicservice.com
   
   Payment address
   We Energies
   Essential Services A299
   PO Box 2046
   Milwaukee, WI 53201-9627
   
   Optional: Applicants may request a pre-application report to obtain information about distribution system and substation conditions at their proposed interconnection location. Complete the form and send to application address. Send $300 non-refundable pre-application request fee to payment address.
   Pre-application request form
   
   
5. Include supplements applying for.
   • Solar photovoltaic supplement form
   • Wind turbine supplement form
   • Generator supplement form
   • Energy storage supplement form
6. Await application approval. After we receive the application, we will:
   • Review it for all required information.
   • Contact you about its status within 10 business days.
   • Request more information if application is incomplete.
   Track interconnection applications by work request number (updated monthly)
   
   Determine if engineering review is needed:
   • We will notify you within 10 business days.
   Complete engineering review:
   • Notify us in writing to proceed and submit applicable payment.
   • Review is scheduled and we notify you of results.
   Determine if distribution study is needed:
   • Engineering review may lead to a distribution study — assessing impact your system will have when connected to the grid.
   • Notify us in writing to proceed and submit applicable payment.
   • Study is scheduled.
   Discuss distribution study and review interconnection options, costs and timeline.
7. Sign interconnection agreement and power purchase agreement.
   • Must be signed by owner and our representative for operation to begin.
8. Install parallel generation and distribution system upgrades.
   • Must happen with mutually agreed-upon time frame after payment is received.
   • After receipt of payment, we will perform the work to upgrade our distribution system and accommodate your generation system (if required).
9. Commissioning system
   Email Certificate of Compliance or local inspector verification to customergen@wisconsinpublicservice.com
   We will witness or verify the system testing.
   This may include:
   • Witnessing commissioning tests.
   • Performing anti-islanding tests.
   • Verifying protective equipment settings.

Additional resources

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