Interconnection Standards (Wisconsin)

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Last modified on February 12, 2015.

Rules Regulations Policies Program

Place Wisconsin

Name Interconnection Standards
Incentive Type Interconnection
Applicable Sector Commercial, Fed. Government, Industrial, Institutional, Local Government, Low-Income Residential, Multi-Family Residential, Nonprofit, Residential, Schools, State Government
Eligible Technologies Anaerobic Digestion, Biodiesel, Biomass, CHP/Cogeneration, Fuel Cells, Fuel Cells using Renewable Fuels, Geothermal Electric, Hydroelectric, Landfill Gas, Microturbines, Municipal Solid Waste, Other Distributed Generation Technologies, Photovoltaics, Small Hydroelectric, Small Wind, Solar Thermal Electric, Wind, Natural Gas
Active Incentive Yes

Implementing Sector State/Territory
Energy Category Renewable Energy Incentive Programs

Applicable Utilities Investor-owned utilities, municipal utilities

External Disconnect Switch Required; Varies by system size and utility

Insurance Requirements Vary by system size and/or type; levels established by PSC

Net Metering Required No

Standard Agreement Yes

System Capacity Limit 15 MW

Date added to DSIRE 2003-06-19
Last DSIRE Review 2012-12-13
Last Substantive Modification
to Summary by DSIRE

References DSIRE[1]


In February 2004, the Wisconsin Public Service Commission adopted interconnection standards for distributed generation (DG) systems up to 15 megawatts (MW) in capacity. All investor-owned utilities (IOUs) and municipal utilities are required to abide by the standard provisions. Electric cooperatives are encouraged -- but not required -- to adopt the state standards. The rules categorize DG systems by capacity and provide for several levels of interconnection review, as follows:

  • Category 1: 20 kilowatts (kW) or less
  • Category 2: larger than 20 kW, but no larger than 200 kW
  • Category 3: larger than 200 kW, but no larger than 1 MW
  • Category 4: larger than 1 MW, but no larger than 15 MW

The PSC has published two sets of standard forms for interconnection, available on the program web site. One set pertains to systems up to 20 kW while the second set applies to larger systems up the maximum size of 15 MW. The PSC also maintains a list of utility interconnection contacts on their Distributed Generation web site. The Wisconsin Distributed Resources Collaborative (WIDRC) has published a set of interconnection guidelines that offer some additional details on the interconnection process.

Generally speaking, Wisconsin's interconnection requirements become more stringent as the system size increases. The rules apply to all public utilities. The 20-kW dividing line between Category 1 and Category 2 installations corresponds to the maximum individual system capacity allowed under the state's net-metering rules. Systems that qualify for net metering are not considered commercial ventures that require commercial liability insurance.

Minimum liability insurance of at least $300,000 per occurrence is required for systems 20 kW and smaller (Category 1) with higher amounts for larger systems based on the category of review under which they fall. However, the law also permits applicants to prove financial responsibility using a negotiated agreement with the utility in lieu of the insurance requirements. Additionally, Category 2-4 facilities must name the utility as an additional insured party in the insurance policy.

Application and study fees vary by category, but systems 20 kW and smaller are not required to pay any fees for application reviews, engineering reviews, or distribution system studies. Facility owners are permitted to file an appeal with the PSC if they believe they are being held to unreasonable requirements, but the rules provide do not provide any guidance on how such appeals will be addressed. In practice, such an appeal would be addressed as a complaint under s. 196.26, Wis. Stats.

Incentive Contact

Contact Name Public Information - PSC
Department Public Service Commission of Wisconsin

Address 610 North Whitney Way
Address 2 P.O. Box 7854
Place Madison, Wisconsin
Zip/Postal Code 53707-7854
Phone (608) 266-5481
Phone 2 (888) 816-3831


Authorities (Please contact the if there are any file problems.)

Authority 1: Wis. Stat. § 196.496

Date Enacted 2001-08-30

Authority 2: Chapter PSC 119
Date Effective 2004-02-01

  • Incentive and policy data are reviewed and approved by the N.C. Solar Center's DSIRE project staff.[1]


  1. 1.0 1.1  "Database of State Incentives for Renewables and Efficiency (DSIRE)"