Adding a wind turbine, solar photovoltaic system, microturbine or fuel cell to your home or business and to our distribution system is called interconnection. This process emphasizes safe installation.
If you install generation, you and your installer are responsible for following the interconnection rules of the Public Service Commission of Wisconsin (PSCW) and for meeting all We Energies tariff requirements.
If you connect to our distribution system with a generation facility with a capacity of 15 megawatts (MW) or less, you must comply with Wisconsin Administrative Code Rules, Chapter PSC 119 Rules for Interconnecting Distributed Generation Facilities.
You and your installer are responsible for coordination of design, installation, operation and maintenance of any generation system you install, and for conforming with the requirements of our tariffs and rules, and applicable governmental laws and regulations (local, state and federal). These requirements are designed to protect distribution system facilities; avoid electrical interference problems; ensure the safety of customers, electric provider employees and the general public; and maintain overall system reliability.
You are required by law to maintain liability insurance (equal to or greater than amounts indicated in PSC 119) or to prove financial responsibility by another means agreeable to us. You are required to notify us if a material modification is made to your generation facility at any time during or after the installation process. A material modification is any modification that changes the maximum electrical output of your facility or changes the interconnection equipment, including:
- Changing from certified to noncertified devices.
- Replacing a component with a component of different functionality or UL listing.
You also are responsible for proper installation, operation and maintenance of specified protective devices. Finally, you shall obtain, at your expense, any and all authorizations, permits and licenses required for construction and operation of your generating facilities.
We are responsible for promptly carrying out the steps below and for meeting all required steps and timelines to process your interconnection application. Our primary contact can assist you with any information you need to complete your interconnection.
The steps below are required by state law to interconnect to our distribution system. Links to actual state law and associated guidelines are included at the end of this page.
Step 1: Notification
Your role: Call 800-714-7777 ext. 7700 to inform us that you want to interconnect an electric generating system to our distribution system.
Our role: We respond to your request within 5 working days and provide all materials necessary to complete your interconnection application. All documents, forms and applications also are included in the required documentation section on this page.
Step 2: Interconnection application
Your role: Complete appropriate distributed generation application form and submit it via one of following:
Mail: We Energies Central Group, PO Box 2046, Milwaukee, WI 53201
Fax: 262-574-6401 or 800-632-1460
Step 3: Application review
Our role: Within 10 working days of receiving a new or revised application, we notify you whether the application is complete. If the application is incomplete, you resubmit it with the needed corrections. We also send you the appropriate standard interconnection agreement and surplus energy agreement, if applicable. Both must be signed by you and by us prior to commencing parallel generation.
Step 4: Engineering review determination
Our role: When your application is complete, we determine whether an engineering review is needed. If an engineering review is necessary, we notify you within 10 working days and state the charge for that review.
Note: If you are not notified about a review in 10 days, go to step 10.
Step 5: Engineering review
Our role: After you notify us in writing to proceed and submit applicable payment, we complete the engineering review and notify you of results.
Step 6: Distribution system study determination
Our role: If the engineering review determines that a distribution system study is necessary, we include a written cost estimate in review summary.
Step 7: Completion of distribution system study
Our role: After you send us written notification to proceed and pay the applicable fee, we conduct the distribution system study. This study assesses the impact of your generating system once connected to our grid. We provide you with study results.
Step 8: Notification of construction or modification costs
Our role: We notify you of distribution system study results and costs associated with any construction or modifications to our grid.
Your role: You provide a written agreement to pay for work related to interconnection modifications.
Step 9: Installation of customer generation
Your role: You submit payment for required upgrade of our distribution system. You install your generating equipment within a timeframe that is mutually agreed upon. You notify us when project construction is complete.
Our role: After we receive payment, we perform all work needed to upgrade our distribution system to accommodate your generating equipment.
Step 10: System testing
Your role: You are required to notify us of the completed installation and give us opportunity to witness or verify system testing. You also are required to provide us with any test results.
Our role: After we receive notification that an installation is complete, we do one (or more) of the following:
- Witness commissioning tests.
- Perform an anti-islanding test or verify protective equipment settings at our expense.
- Waive our right, in writing to witness or verify commissioning tests.
Step 11: Testing approval/rejection
Our role: We notify you of our approval or rejection of interconnection.
If approved, we provide a written statement of final acceptance and cost reconciliation. If we do not approve interconnection, you may take corrective action and ask that we re-examine your interconnection request.
Step 12: Interconnection agreement
Your role: After you receive an interconnection approval notice, the appropriate distributed generation interconnection agreement must be signed by you and us before parallel operation commences. Complete and submit the appropriate document to the energy service consultant. If you intend to sell energy to us, you also must execute a surplus energy agreement. This agreement varies by size and type of generation, so contact the energy service consultant to obtain the appropriate agreement form. When the standard interconnection agreement and surplus energy agreement forms are completed and signed by you and us, and all other requirements are met, you may begin operation of your generating equipment.
- Distributed generation application form and agreement
- Energy agreements
- Customer generation <15 MW and no energy sale (CGS NP)
- Customer generation <300 kW (CGS NM)
- Customer generation <2 MW (CGS DS-FP)
- Customer generation 2 MW to 15 MW (CGS DS-VP)
- Customer generation over 20 kW (CGS 1)
- Nonrenewable generation 20 kW or less (CGS 7)
- Renewable generation 20kW or less (CGS 8)
Information for owner and installer
- Customer-owned generation diagrams
- Wisconsin Administrative Code Chapter PSC 119–Rules for Interconnecting Distributed Generation Facilities
- Wisconsin Distributed Generation Interconnection Guidelines
- Technical Requirements Supplement
- Cogeneration procedure for commissioning
- PVWatts calculator
- Key terms and definitions
Customer generation tariffs
Open to new accounts
- CGS NP – Up to 15MW (201.4 to 201.5)
- CGS NM – Less than 300kW (201.6 to 201.8)
- CGS DS-FP – Less than 2MW (201.9 to 201.10)
- CGS DS-VP – 2MW to 15MW (201.11 to 201.12)
- Conditions of Purchase CGS Rate Schedules (135 to 138)
Closed to new accounts
- CGS 1* – Over 20kW (131,132)
- CGS 2* – 20kW or less (133,134)
- CGS 3 – 300kW or more (139 to 144)
- CGS 4 – Wind Generating System – 20kW to 100kW (188 to 189)
- CGS 5 – Biogas Generating System – 2000kW or less (190 to 192)
- CGS 6* – Renewable Generating Systems – 20kW or less (198 to 199)
- CGS 7 – Non-Renewable – 20kW or less (200 to 201)
- CGS 8* – 20kW or less (201.1 to 201.3)
- CGS PV* – Experimental Renewable Energy (Solar PV) Distributed Generation
(184 to 187)
* For inverter-based generating systems such as photovoltaic (solar) systems, the capacity is measured as the nameplate rating of the generator in kW DC.