Chapter PSC 119

PSC 119.04(4)(h)2. 2. Perform an unintentional islanding test or verify the protective equipment settings at its expense.

PSC 119.04(4)(h)3. 3. Waive its right, in writing, to witness or verify the commissioning tests.

PSC 119.04(4)(i) (i) The applicant shall provide the public utility with the results of any required tests within 5 working days of the completion of the test, for a Category 1 facility, or within 10 working days, for a Category 2 to 4 facility.

PSC 119.04(4)(j) (j) The public utility shall, unless rights have been waived per par. (h) 3., review the results of the on-site test. Upon receipt of the test results, the public utility shall notify the applicant within 5 working days, for a Category 1 facility, or within 10 working days, for a Category 2 to 4 facility, of its approval or disapproval of the interconnection.

PSC 119.04(4)(j)1. 1. If approved, the public utility shall provide a written statement of final acceptance and reconciliation of costs from the engineering review, distribution system study, and any required distribution system upgrades or modifications. Public utilities shall refund to the applicant any fees paid in excess of costs incurred by the utility. Applicants shall pay any additional costs incurred by the utility in excess of previous payments. Any applicant for a DG system that passes the commissioning test may sign a standard interconnection agreement and interconnect.

PSC 119.04(4)(j)2. 2. If the public utility does not approve the interconnection, the applicant may take corrective action and request the public utility to reexamine its interconnection request. The applicant shall provide the utility with written notification that corrective action has been taken and request reexamination within 15 working days of receiving notification of disapproval. At the request of the applicant, the utility may provide a 15 working day extension of the deadline to provide notification to proceed and full payment. If a request for reexamination has been received by the utility within 30 working days after the deadline to accept, the interconnection application shall be deemed withdrawn.

PSC 119.04(4)(k) (k) A standard interconnection agreement shall be signed by the applicant and public utility before parallel operation commences, within 5 working days of the interconnection being deemed approved by the public utility, for a Category 1 facility, or within 10 working days for a Category 2 to 4 facility.

PSC 119.04(5) (5) 

PSC 119.04(5)(a) (a) All public utilities shall maintain a single application queue that shall identify the status of all applications submitted to the utility and shall be used to address applicant inquiries about application status.

PSC 119.04(5)(b) (b) Public utilities who serve more than 100,000 customers shall make their application queue public. Public application queues shall be posted on the utility’s website and updated on at least a monthly basis. Certain applications may be removed or redacted when posting in the interest of national security.

PSC 119.04(5)(c) (c) At a minimum, the information maintained in an application queue, including public application queues, shall include for all applications active on or submitted to the utility after May 1, 2024:

PSC 119.04(5)(c)1. 1. Application or queue numbers that enable applicants to identify their submissions.

PSC 119.04(5)(c)2. 2. Technology type(s).

PSC 119.04(5)(c)3. 3. Proposed DG facility nameplate capacity and, where applicable, export capacity, in kW or MW.

PSC 119.04(5)(c)4. 4. Category assignment.

PSC 119.04(5)(c)5. 5. Location by city, state, and county.

PSC 119.04(5)(c)6. 6. Substation and circuit on which the proposed installation would be located.

PSC 119.04(5)(c)7. 7. Current application status (active, withdrawn, approved, in service).

PSC 119.04(5)(c)8. 8. Date application deemed complete, if applicable.

PSC 119.04(5)(c)9. 9. Current status of the application’s progress through the application process steps outlined in this section.

PSC 119.04(5)(c)10. 10. Date of signed interconnection agreement, if applicable.

PSC 119.04(6) (6) Upon approval of an application under sub. (4) (a), (c), or (g), the public utility shall provide the applicant with an interconnection approval memorandum that confirms the utility’s application approval and identifies any applicable conditions of approval. For Category 2 to 4 facilities, the memorandum and associated attachments shall provide:

PSC 119.04(6)(a) (a) The date of approval.

PSC 119.04(6)(b) (b) Completed application materials.

PSC 119.04(6)(c) (c) Engineering review requirements, if applicable.

PSC 119.04(6)(d) (d) Distribution system study requirements, if applicable.

PSC 119.04(6)(e) (e) Identification of the authorized tariff or program agreement applicable to the DG facility at the time the memorandum is issued.

PSC 119.04(6)(f) (f) Expiration date of the memorandum if utility requirements are not met, including identification of options for deadline extensions.

PSC 119.04(6)(g) (g) System specifications and specific requirements imposed by the utility as conditions of approval.

PSC 119.04(6)(h) (h) Estimated distribution system construction or modification costs and scope, if applicable.

PSC 119.04(6)(i) (i) Estimated completion date for the public utility to complete distribution system upgrades, if applicable.

PSC 119.04(6)(j) (j) A copy of the standard interconnection agreement that would be executed by both parties upon completion of all requirements, including any anticipated distribution system upgrades.

PSC 119.04(6)(k) (k) Acknowledgement that the public utility will interconnect the DG facility if all identified conditions are met.

PSC 119.04 History History: CR 03-003: cr. Register January 2004 No. 577, eff. 2-1-04; CR 22-077: am. (1), (2), cr. (2m), am. (3), cr. (3g), (3r), (4) (intro.), renum. (4) to (4) (a) and am., cr. (4) (b), renum. (5) to (4) (c) and am., renum. (5) (a) to (d) to be (4) (c) 1. to 4., renum. (6) to (4) (d) and am., renum. (7) (intro.) to (4) (e) (intro.) and am., renum. (7) (a) to (d) to be (4) (e) 1. to 4. and, as renumbered, am. 4., renum. (8) to (4) (f) and am., renum. (10) (a) to (4) (h) and, as renumbered, am. (intro.), 2., renum. (10) (b) to (4) (i) and am., renum. (11), (12) to (4) (j), (k), and am., cr. (5), (6) Register April 2024 No. 820, eff. 5-1-24; correction in (4) (e) (4) made under s. 35.17, Stats., Register April 2024 No. 820.

PSC 119.05 PSC 119.05 Insurance and indemnification.

PSC 119.05(1) (1) An applicant seeking to interconnect a Category 1 DG facility to the distribution system of a public utility shall maintain liability insurance equal to or greater than the amounts stipulated in Table PSC 119.05-1, per occurrence, or prove financial responsibility by another means mutually agreeable to the applicant and the public utility.

PSC 119.05(1m) (1m) An applicant seeking to interconnect a Category 2 to 4 DG facility to the distribution system of a public utility shall maintain liability insurance equal to or greater than the amounts stipulated in Table PSC 119.05-1, per occurrence, and shall name the public utility as an additional insured party in the liability insurance policy, or prove financial responsibility by another means mutually agreeable to the applicant and the public utility.

- See PDF for table

PSC 119.05(2) (2) Each party to the standard interconnection agreement shall indemnify, hold harmless and defend the other party, its officers, directors, employees and agents from and against any and all claims, suits, liabilities, damages, costs and expenses resulting from the installation, operation, modification, maintenance or removal of the DG facility. The liability of each party shall be limited to direct actual damages, and all other damages at law or in equity shall be waived.

PSC 119.05 History History: CR 03-003: cr. Register January 2004 No. 577, eff. 2-1-04; CR 22-077: am. (1), cr. (1m) Register April 2024 No. 820, eff. 4-1-24.

PSC 119.06 PSC 119.06 Modifications to the DG facility. The applicant shall notify the public utility of plans for any material modification to the DG facility by providing at least 20 working days of advance notice for a Category 1 DG facility, 40 working days for Category 2 DG facility, and 60 working days for a Category 3 or 4 DG facility. The applicant shall provide this notification by submitting a revised standard application form and such supporting materials as may be reasonably requested by the public utility. The applicant may not commence any material modification to the DG facility until the public utility has approved the revised application, including any necessary engineering review or distribution system study. The public utility shall indicate its written approval or rejection of a revised application within the number of working days shown in the table below. Upon completion of the application process, a new standard interconnection agreement shall be signed by both parties prior to parallel operation. If the public utility fails to respond in the time specified in Table 119.06-1, the completed application is deemed approved.

- See PDF for table

PSC 119.06 History History: CR 03-003: cr. Register January 2004 No. 577, eff. 2-1-04; CR 22-077: am. Table 119.06-1 Register April 2024 No. 820, eff. 5-1-24.

PSC 119.07 PSC 119.07 Easements and rights-of-way. If a public utility line extension is required to accommodate a DG interconnection, the applicant shall provide, or obtain from others, suitable easements or rights-of-way. The applicant is responsible for the cost of providing or obtaining these easements or rights of way.

PSC 119.07 History History: CR 03-003: cr. Register January 2004 No. 577, eff. 2-1-04.

PSC 119.08 PSC 119.08 Fees and distribution system costs.

PSC 119.08(1) (1) Upon receiving a standard application form, the public utility shall specify the amount of any engineering review or distribution system study fees. The applicant shall pay the fees specified in Table PSC 119.08, unless the public utility chooses to waive the fees in whole or in part. For any fees paid by the applicant per Table PSC 119.08, any unexpended funds shall be credited to subsequent interconnection steps and associated fee obligations.

- See PDF for table

PSC 119.08(2) (2) The public utility may recover from the applicant an amount up to the actual cost, for labor and parts, of any distribution system upgrades required. The utility may charge for retesting an installation that does not conform to the requirements set forth in this chapter. The fee for retesting shall be equal to the applicable commissioning fee, unless at the public utility’s discretion a lower fee amount is assessed.

PSC 119.08(3) (3) Costs for any necessary line extension shall be assessed pursuant to s. PSC 113.1005.

PSC 119.08(4) (4) For any application that is withdrawn by the applicant or deemed withdrawn by the public utility, the public utility shall provide the applicant with a reconciliation of costs from any engineering review, distribution system study, or required distribution system upgrades or modifications performed. Public utilities shall refund to the applicant any fees paid in excess of costs incurred by the utility. Applicants shall pay any additional costs incurred by the utility in excess of previous payments.

PSC 119.08(5) (5) Public utilities may assess a fee of up to $300 for preparation of a pre-application report, unless the public utility chooses to waive the fee in whole or in part.

PSC 119.08(6) (6) For each year in which a public utility assessed an engineering review fee or a distribution system study fee for a Category 1 or 2 facility, the public utility shall provide a report to the commission by March 31 of the following year which includes:

PSC 119.08(6)(a) (a) The number of Category 1 and 2 facilities in which an engineering review fee was assessed and the average engineering review fee that was charged to applicants.

PSC 119.08(6)(b) (b) The number of Category 1 and 2 facilities in which a distribution system study fee was assessed and the average distribution system study fee that was charged to applicants.

PSC 119.08 History History: CR 03-003: cr. Register January 2004 No. 577, eff. 2-1-04; CR 22-077: am. (1), Table 119.08-1, (2), cr. (4) to (6) Register April 2024 No. 820, eff. 5-1-24.

PSC 119.09 PSC 119.09 Disconnection. A public utility may refuse to connect or may disconnect a DG facility from the distribution system only under any of the following conditions:

PSC 119.09(1) (1) Lack of approved standard application form or standard interconnection agreement.

PSC 119.09(2) (2) Termination of interconnection by mutual agreement.

PSC 119.09(3) (3) Non-compliance with the technical or contractual requirements.

PSC 119.09(4) (4) Distribution system emergency.

PSC 119.09(5) (5) Routine maintenance, repairs, and modifications, but only for a reasonable length of time necessary to perform the required work and upon reasonable notice.

PSC 119.09 History History: CR 03-003: cr. Register January 2004 No. 577, eff. 2-1-04.

PSC 119.10 PSC 119.10 One-line schematic diagram.

PSC 119.10(1) (1) The applicant shall include a one-line schematic diagram with the completed standard application form. ANSI symbols shall be used in the one-line schematic diagram to show the following:

PSC 119.10(1)(a) (a) Generator or inverter.

PSC 119.10(1)(b) (b) Point where the DG facility is electrically connected to the customer’s electrical system.

PSC 119.10(1)(c) (c) Point of common coupling.

PSC 119.10(1)(d) (d) Lockable interconnection disconnect switch.

PSC 119.10(1)(e) (e) Method of grounding, including generator and transformer ground connections.

PSC 119.10(1)(f) (f) Protection functions and systems.

PSC 119.10(2) (2) The applicant shall include with the schematic diagram technical specifications of the point where the DG facility is electrically connected to the customer’s electrical system, including all unintentional islanding and power quality protective systems. The specifications regarding the unintentional islanding protective systems shall describe all automatic features provided to disconnect the DG facility from the distribution system in case of loss of grid power, including the functions for over/under voltage, over/under frequency, overcurrent, and loss of synchronism. The applicant shall also provide technical specifications for the generator, lockable interconnection disconnect switch, and grounding and shall attach the technical specification sheets for any certified equipment. The applicant shall include with the schematic diagram a statement by the manufacturer that its equipment meets or exceeds the type tested requirements for certification.

PSC 119.10 History History: CR 03-003: cr. Register January 2004 No. 577, eff. 2-1-04; CR 22-077: am. (2) Register April 2024 No. 820, eff. 5-1-24.

PSC 119.11 PSC 119.11 Control schematics. For equipment not certified under s. PSC 119.26, the applicant shall include with the application a complete set of control schematics showing all protective functions and controls for generator protection and distribution system protection.

PSC 119.11 History History: CR 03-003: cr. Register January 2004 No. 577, eff. 2-1-04.

PSC 119.12 PSC 119.12 Site plan. For all categories, the applicant shall include with the application a site plan that shows the location of the interconnection disconnect switch, adjoining street name, and the street address of the DG facility. For Category 2, 3, or 4 DG facilities, the site plan shall show the location of major equipment, electric service entrance, electric meter, interconnection disconnect switch, and interface equipment.

PSC 119.13 PSC 119.13 Pre-application report.

PSC 119.13(1) (1) Potential applicants may request a pre-application report in order to obtain information about system conditions at their proposed interconnection location, without submitting an application under s. PSC 119.04.

PSC 119.13(2) (2) To request a pre-application report, potential applicants shall complete and submit to its public utility the standard pre-application request form. A request for a pre- application report shall not be considered submitted until applicant submits the standard pre-application form and pays applicable pre-application review fees under s. PSC 119.08 (5).

PSC 119.13(3) (3) All submitted pre-application report requests shall be reviewed for completeness in the order in which they fulfill the requirements of sub. (2).

PSC 119.13(3m) (3m) Public utilities shall evaluate the submitted pre-application form for completeness within 5 business days of receipt. A complete request shall include location information that allows the public utility to clearly identify a proposed point of interconnection, and information on the proposed DG facility sufficient to identify DG type, nameplate and export capacity, and service configuration.

PSC 119.13(4) (4) All complete pre-application report requests shall receive pre-application reports in the order in which they fulfill the requirements of sub. (3). Within 15 business days of determining a pre-application report request complete, the public utility shall respond by providing the applicant with a completed standard pre- application report that provides information on the capacity, network and operating characteristics, and applicable operating constraints at the proposed point of interconnection.

PSC 119.13(4m) (4m) Completed pre-application reports shall reflect the best available information using existing data readily available to the public utility at the time of reporting. A public utility shall not be obligated to conduct additional analysis of the proposed project or location in order to complete a pre- application report. The report shall communicate to potential applicants that the information provided is subject to change and may not be applicable as of the date when a future application is submitted.

PSC 119.13 History History: CR 22-077: cr. Register April 2024 No. 820, eff. 5-1-24; renum. (3) (a), (4) (a) to be (3m) and (4m) under s. 13.92 (4) (b) 1., Stats., Register April 2024, No. 820.

subch. III of ch. PSC 119 Subchapter III — Design Requirements

PSC 119.20 PSC 119.20 General design requirements.

PSC 119.20(1) (1) The applicant shall install protection devices to ensure that the current supplied by the DG facility is interrupted if a fault or other potentially dangerous event occurs on the distribution system. If such an event occurs and the public utility’s distribution system is de-energized, any DG facility that is connected to this distribution system shall automatically disconnect. All DG facilities shall utilize protection devices that prevent electrically closing a DG facility that is out of synchronization with the distribution system.

PSC 119.20(2) (2) All installations shall include equipment circuit breakers, on the DG facility side of the point where the DG facility is electrically connected to the customer’s electrical system, that are capable of interrupting the maximum available fault current. Equipment circuit breakers shall meet all applicable UL, ANSI, and IEEE standards.