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Incentives/Policies for Renewables & Efficiency

Printable Version
Interconnection Guidelines   

Last DSIRE Review: 11/04/2014
Program Overview:
State: Arizona
Incentive Type: Interconnection
Eligible Renewable/Other Technologies: Solar Thermal Electric, Photovoltaics, Landfill Gas, Wind, Biomass, Hydroelectric, Geothermal Electric, Fuel Cells, CHP/Cogeneration, Fuel Cells using Renewable Fuels, Microturbines, Other Distributed Generation Technologies
Applicable Sectors: Commercial, Industrial, Residential
Applicable Utilities:Investor-owned utilities, SRP
System Capacity Limit:Varies by utility
Standard Agreement:Varies by utility
Insurance Requirements:Vary by utility
External Disconnect Switch:Varies by utility
Net Metering Required:No
Web Site:

Note: In June 2007, the Arizona Corporation Commission (ACC) initiated a rulemaking process to establish statewide interconnection standards for distributed generation (DG). This proceeding is still in progress. Until the new official rules go into effect, the commission has recommended that the utilities use the Interconnection Document as a guide. This document applies to systems up to 10 megawatts (MW) in capacity.

The state's utilities independently developed interconnection agreements for distributed generation (DG) prior to the ACC's ongoing proceeding to establish statewide standards. The Salt River Project (SRP), which is not regulated by the ACC on utility matters, developed DG interconnection guidelines and an interconnection agreement based on draft rules and a report released by the ACC in 1999 and 2000, respectively. SRP's rules include technical protection requirements, a flow chart of interconnection procedures and a two-page interconnection application. The rules establish separate requirements for units based on system capacity:

  • Class I: 50 kilowatts (kW) or less, single or three-phase
  • Class II: 51 kW to 300 kW, three-phase
  • Class III: 301 kW to five megawatts (MW), three-phase
  • Class IV: greater than 5 MW, three-phase

Tucson Electric Power (TEP) and Arizona Public Service (APS) -- the other two major electric utilities in Arizona -- have similarly established their own interconnection procedures for DG systems. It is likely that Arizona's regulated utilities will adopt the ACC's interconnection standards when the final rules are adopted.

  Barbara Keene
Arizona Corporation Commission
1200 W. Washington St.
Phoenix, AZ 85007
Phone: (602) 542-0853
Fax: (602) 364-2270
Web Site:
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Disclaimer: The information presented on the DSIRE web site provides an unofficial overview of financial incentives and other policies. It does not constitute professional tax advice or other professional financial guidance, and it should not be used as the only source of information when making purchasing decisions, investment decisions or tax decisions, or when executing other binding agreements. Please refer to the individual contact provided below each summary to verify that a specific financial incentive or other policy applies to your project.

While the DSIRE staff strives to provide the best information possible, the DSIRE staff, the N.C. Solar Center, N.C. State University and the Interstate Renewable Energy Council, Inc. make no representations or warranties, either express or implied, concerning the accuracy, completeness, reliability or suitability of the information. The DSIRE staff, the N.C. Solar Center, N.C. State University and the Interstate Renewable Energy Council, Inc. disclaim all liability of any kind arising out of your use or misuse of the information contained or referenced on DSIRE Web pages.

Copyright 2014 - 2015 North Carolina State University, under NREL Subcontract No. XEU-0-99515-01. Permission granted only for personal or educational use, or for use by or on behalf of the U.S. government. North Carolina State University prohibits the unauthorized display, reproduction, sale, and/or distribution of all or portions of the content of the Database of State Incentives for Renewables and Efficiency (DSIRE) without prior, written consent.