Subchapter I — General
Subchapter II — General Requirements
PSC 119.03 Designated point of contact.
PSC 119.04 Application process for interconnecting DG facilities.
PSC 119.05 Insurance and indemnification.
PSC 119.06 Modifications to the DG facility.
PSC 119.07 Easements and rights-of-way.
PSC 119.08 Fees and distribution system costs.
PSC 119.09 Disconnection.
PSC 119.10 One-line schematic diagram.
PSC 119.11 Control schematics.
Subchapter III — Design Requirements
PSC 119.20 General design requirements.
PSC 119.25 Minimum protection requirements.
Subchapter IV — Equipment Certification
PSC 119.26 Certified paralleling equipment.
PSC 119.27 Non-certified paralleling equipment.
Subchapter V — Testing of DG Facility Installations
PSC 119.30 Anti-islanding test.
PSC 119.31 Commissioning tests for paralleling equipment in Categories 2 to 4.
PSC 119.32 Additional test.
PSC 119.40 Right to appeal.
PSC 119.01
PSC 119.01 Scope. This chapter implements s.
196.496, Stats. It applies to all DG facilities with a capacity of 15 MW or less that are interconnected, or whose owner seeks to have interconnected, to an electric public utility's distribution system. It also applies to all electric public utilities to whose distribution systems a DG facility is interconnected, or to which interconnection is sought. These rules establish uniform statewide standards for the interconnection of DG facilities to an electric distribution system.
PSC 119.01 History
History: CR 03-003: cr.
Register January 2004 No. 577, eff. 2-1-04.
PSC 119.02
PSC 119.02 Definitions. In this chapter:
PSC 119.02(1)
(1) “ANSI" means American National Standards Institute.
PSC 119.02(2)
(2) “Applicant" means the legally responsible person applying to a public utility to interconnect a DG facility to the public utility's distribution system.
PSC 119.02(3)
(3) “Application review" means a review by the public utility of the completed standard application form for interconnection, to determine if an engineering review or distribution system study is needed.
PSC 119.02(4)
(4) “Category 1" means a DG facility of 20 kW or less.
PSC 119.02(5)
(5) “Category 2" means a DG facility of greater than 20 kW and not more than 200 kW.
PSC 119.02(6)
(6) “Category 3" means a DG facility of greater than 200 kW and not more than 1 MW.
PSC 119.02(7)
(7) “Category 4" means a DG facility of greater than 1 MW and not more than 15 MW.
PSC 119.02(8)
(8) “Certified equipment" means a generating, control or protective system that has been certified by a nationally recognized testing laboratory as meeting acceptable safety and reliability standards.
PSC 119.02(9)
(9) “Commission" means the public service commission of Wisconsin.
PSC 119.02(10)
(10) “Commissioning test" means the process of documenting and verifying the performance of a DG facility so that it operates in conformity with the design specifications.
PSC 119.02(11)
(11) “Customer" means any person who is receiving electric service from a public utility's distribution system.
PSC 119.02(14)
(14) “Distribution feeder" means an electric line from a public utility substation or other supply point to customers that is operated at 50 kV or less, or as determined by the commission.
PSC 119.02(15)
(15) “Distribution system" means all electrical wires, equipment, and other facilities owned or provided by a public utility that are normally operated at 50 kV or less.
PSC 119.02(16)
(16) “Distribution system study" means a study to determine if a distribution system upgrade is needed to accommodate the proposed DG facility and to determine the cost of any such upgrade.
PSC 119.02(17)
(17) “Engineering review" means a study that may be undertaken by a public utility, in response to its receipt of a completed standard application form for interconnection, to determine the suitability of the installation.
PSC 119.02(18)
(18) “Fault" means an equipment failure, conductor failure, short circuit, or other condition resulting from abnormally high amounts of current from the power source.
PSC 119.02(19)
(19) “IEEE" means Institute of Electrical and Electronics Engineers.
PSC 119.02(20)
(20) “Interconnection" means the physical connection of a DG facility to the distribution system so that parallel operation can occur.
PSC 119.02(21)
(21) “Interconnection disconnect switch" means a mechanical device used to disconnect a DG facility from a distribution system.
PSC 119.02(22)
(22) “Inverter" means a machine, device, or system that converts direct current power to alternating current power.
PSC 119.02(23)
(23) “Islanding" means a condition on the distribution system in which a DG facility delivers power to customers using a portion of the distribution system that is electrically isolated from the remainder of the distribution system.
PSC 119.02(26)
(26) “Material modification" means any modification that changes the maximum electrical output of a DG facility or changes the interconnection equipment, including:
PSC 119.02(26)(b)
(b) Replacing a component with a component of different functionality or UL listing.
PSC 119.02(28)
(28) “Nationally recognized testing laboratory" means any testing laboratory recognized by the U.S. Department of Labor Occupational Safety and Health Administration's accreditation program.
PSC 119.02(29)
(29) “Network service" means 2 or more primary distribution feeders electrically connected on the low voltage side of 2 or more transformers, to form a single power source for any customer.
PSC 119.02(30)
(30) “Parallel operation" means the operation, for longer than 100 milliseconds, of an on-site DG facility while the facility is connected to the energized distribution system.
PSC 119.02(31)
(31) “Paralleling equipment" means the generating and protective equipment system that interfaces and synchronizes a DG facility with the distribution system.
PSC 119.02(32)
(32) “Point of common coupling" means the point where the electrical conductors of the distribution system are connected to the customer's conductors and where any transfer of electric power between the customer and the distribution system takes place.
PSC 119.02(34)
(34) “Standard application form" means PSC Form 6027 for Category 1 DG facilities or PSC Form 6028 for Category 2 to 4 DG facilities.
PSC 119.02(35)
(35) “Standard interconnection agreement" means PSC Form 6029 for Category 1 facilities or PSC Form 6030 for Category 2 to 4 DG facilities.
PSC 119.02 Note
Note: A copy of PSC Forms 6027 to 6030 can be obtained at no charge from your local electric utility or from the Public Service Commission, PO Box 7854, Madison, WI 53707-7854.
PSC 119.02(36)
(36) “Telemetry" means transmission of DG operating data using telecommunications techniques.
PSC 119.02 History
History: CR 03-003: cr.
Register January 2004 No. 577, eff. 2-1-04.
PSC 119.03
PSC 119.03 Designated point of contact. Each public utility shall designate one point of contact for all customer inquiries related to DG facilities and from which interested parties can obtain installation guidelines and the appropriate standard commission application and interconnection agreement forms. Each public utility shall have current information concerning its DG point of contact on file with the commission.
PSC 119.03 History
History: CR 03-003: cr.
Register January 2004 No. 577, eff. 2-1-04.
PSC 119.04
PSC 119.04 Application process for interconnecting DG facilities. Public utilities and applicants shall complete the following steps regarding interconnection applications for all classes of DG facilities, in the order listed:
PSC 119.04(1)
(1) The public utility shall respond to each request for DG interconnection by furnishing, within 5 working days, its guidelines and the appropriate standard application form.
PSC 119.04(2)
(2) The applicant shall complete and submit the standard application form to its public utility.
PSC 119.04(3)
(3) Within 10 working days of receiving a new or revised application, the public utility shall notify the applicant whether the application is complete.
PSC 119.04(4)
(4) Within 10 working days of determining that the application is complete, the public utility shall complete its application review. If the public utility determines, on the basis of the application review that an engineering review is needed, it shall notify the applicant and state the cost of that review. For Categories 2 and 3, the cost estimate shall be valid for one year. For Category 4, the time period shall be negotiated but may not exceed one year
. If the application review shows that an engineering review is not needed, the applicant may install the DG facility and need not complete the steps described in
subs. (5) to
(9).
PSC 119.04(5)
(5) If the public utility determines on the basis of the application review that an engineering review is needed, upon receiving from the applicant written notification to proceed and receipt of applicable payment from the applicant, the public utility shall complete an engineering review and notify the applicant of the results within the following times:
PSC 119.04(6)
(6) If the engineering review indicates that a distribution system study is necessary, the public utility shall include, in writing, a cost estimate in its engineering review. The cost estimate shall be valid for one year and the applicant shall have one year from receipt of the cost estimate in which to notify the public utility to proceed, except for a Category 4 DG application, in which case the time period shall be negotiated, but may not extend beyond one year. Upon receiving written notification to proceed and payment of the applicable fee, the public utility shall conduct the distribution system study.
PSC 119.04(7)
(7) The public utility shall within the following time periods complete the distribution system study and provide study results to the applicant:
