AZ Power -- Planning for Arizona's Future

PV-PW 500kV transmission project

The PV-PW project is composed of new 500 kilovolt (kV) transmission lines that will serve Pinal and Maricopa Counties. The project involves transporting power from the area near Palo Verde Generating Station to a new substation in western Pinal County (PW) near Hidden Valley.

Image of transmission lines

A Certificate of Environmental Compatibility (CEC) was filed Dec. 16, 2003. Hearings were held on Feb. 9-10, 2004; additional hearings were held March 15-16. The Arizona Corporation Commission (ACC) approved the certificate of environmental compatibility (CEC), Decision 67012, for the PV-PW project on May 18.

The PV-PW transmission line, in conjunction with the PW-SEV/BRG transmission project (formerly the PW-SEV/BOB project), will span a total of approximately 160 miles.

Construction updates

In accordance with the PV-PW 500kV CEC condition #12, packets depicting the line route, depicting the location of the Pinal West substation, depicting the poles and announcing the beginning of construction of the PV-PW line were mailed to the developers and homebuilders within one mile of the line route the week of Oct. 15, 2007. Additional information will be mailed as future line segments near completion.

Copies of the materials mailed are available in PDF format below:


Various maps of the project are available online or in PDF* format:

The maps below show maps of the larger study area including both the PV-PW and PW-SEV/BRG projects:

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Siting and public process

An extensive siting process was conducted for the PV-PW and PW-SEV/BRG 500kV projects to determine the most appropriate location for each within an approximate 2000-square-mile study area (534K PDF). Find out more about the public process and schedule.

Visit the Arizona Corporation Commission (ACC) Web site for answers to frequently asked questions about transmission line siting.

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Project origin

As a result of the Central Arizona Transmission System (CATS) Study, new power transmission capacity is planned for central Arizona. A study of regional scope was collaboratively prepared by 18 public and private utility companies, with participation by the Arizona Corporation Commission.

The objective of CATS is to analyze system reliability, capacity and increasing demand for energy delivery in Arizona, and to plan for any additional required transmission.

The project began as one but was divided into two projects, Palo Verde to Pinal West (PV-PW) and Pinal West to Southeast Valley/Browning (PW-SEV/BRG).

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The PV-PW project participants are SRP, Tucson Electric Power, Southwest Transmission Cooperative Inc., Electrical District Number 2, Electrical District Number 3, and Electrical District Number 4. The project is managed by SRP. These Arizona utilities are taking this initial step to increase the Arizona transmission system capacity in Pinal and Maricopa counties.

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Electric and magnetic field information

Please visit one of the following Web sites for more information about electric and magnetic fields (EMF):

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Contact us

If you have questions or comments about the project, please contact us.Comuníquese con nosotros

E-mail: Send questions to

Telephone: Call SRP Public Involvement at (602) 236-2872 or 1 (800) 380-6123.

Information request form: For questions about the project, complete our online request for information form.

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*To view PDF files, you'll need Adobe Acrobat Reader if you don't have it. It is free and you will only need to download it once. Then, return to this page to view the report sections and maps.

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