Ariz. Admin. Code § 14-2-2603

Current through Register Vol. 30, No. 25, June 21, 2024

Section R14-2-2603 - Types of Generating Facilities

A. A Customer may operate a Generating Facility as an Exporting System, a Non-Exporting System, or an Inadvertent Export System.

B. An Applicant shall declare the Maximum Capacity of a Generating Facility in its Application.

C. If an Applicant claims a Generating Facility is a Non-Exporting System:

1. The Utility may require an independent third-party certification ensuring that the system meets the following standards:

a. Is able to supply part or all of the Customer's load continuously or during a Utility power outage;

b. Is sized such that the export of power is not possible or includes control functions to prevent the export of power; and

c. Has control functions that are listed by an NRTL for the purpose as used and are also inspected and approved by the Customer's Jurisdictional Electric Inspection Agency; and

2. The Applicant shall ensure that the Generating Facility utilizes any combination of equipment, hardware, or software, as specified by the Utility in its Interconnection Manual, to prevent the transfer of electrical energy to the Distribution System.

D. If an Applicant claims a Generating Facility is an Inadvertent Export system that does not utilize only UL 1741-certified or UL 1741SA-listed grid support non-islanding inverters:

1. The Utility may require additional protective functions and equipment to detect Distribution System faults;

2. The amount of Inadvertent Export to the Distribution System shall be limited to the lesser of the following values:

a. 50% of the Generating Facility's Maximum Capacity;

b. 10% of the continuous conductor rating in watts at 0.9 power factor for the lowest rated feeder conductor upstream of the Generating Facility; or

c. 500 kW; and

3. The expected frequency of Inadvertent Export events shall be less than two occurrences per 24-hour period.

E. If an Applicant claims a Generating Facility is an Inadvertent Export system that utilizes only UL 1741-certified or UL 1741SA-listed grid support non-islanding inverters, the Generating Facility shall:

1. Utilize control functions that limit the export of electrical power to the Distribution System;

2. Have a Maximum Capacity of 500 kVA or less;

3. Have a magnitude of Inadvertent Export no more than 100 kVA;

4. Have a duration of Inadvertent Export of power of less than 30 seconds for any single event;

5. Monitor that its total energy export per month is maintained to be no more than its Maximum Capacity multiplied by 0.1 hours per day over a rolling 30-day period (e.g., a 100 k VA gross nameplate capacity Generating Facility would have a maximum energy export per 30-day month of 300 kWh);

6. Disconnect the Generating Facility from the Distribution System in the event of an Inadvertent Export, ceasing to energize the Distribution System or halting energy production, within two seconds after the period of uninterrupted export exceeds 30 seconds or the magnitude of export exceeds 100 kVA; and

7. Enter a safe operation mode, where Inadvertent Export events cannot occur, upon failure of the control or inverter system for more than 30 seconds, whether from loss of control signal, loss of control power, or a single component failure or related control sensing of the control circuitry.

Ariz. Admin. Code § R14-2-2603

Adopted by final rulemaking at 26 A.A.R. 473, effective 2/25/2020.