PW-SEV/BRG 500kV project background
The Pinal West to Southeast Valley/Browning project (PW-SEV/BRG) is composed of new 500 kilovolt (kV) and 230 kV transmission lines and substations that will serve Pinal, Pima and Maricopa Counties.
The project is planned jointly by the Salt River Project Agricultural Improvement and Power District (SRP), Tucson Electric Power Company, Electrical District Number 2, Electrical District Number 3, Electrical District Number 4, and Southwest Transmission Cooperative Inc. The project is managed by SRP.
The project involves:
- Transporting power from the new Pinal West (PW) substation in western Pinal County southwest of the City of Maricopa to a new 500 kV substation that will interconnect with the existing Santa Rosa substation located south of the Ak Chin Indian Community.
From the Santa Rosa substation, the 500 kV line will extend to the new Southeast Valley (SEV) 500/230/69 kV substation located northwest of Florence in northeastern Pinal County. Contingent upon which of the alternative routes is selected for the transmission line, a future Pinal South Substation, south of Coolidge, may also be included in the Project.
- From the new SEV substation a double circuit 500/230kV transmission line will be sited along with a new 230/69 kV substation (RS19) to be located northeast of the town of Queen Creek. From the RS 19 substation, the new 500/230 kV transmission line will continue on to the existing Browning substation in east Mesa.
An application for a Certificate of Environmental Compatibility (CEC) was filed for the PW-SEV/BRG project Oct. 7, 2004. On May 10, 2005, the Arizona Power Plant and Transmission Line Siting Committee recommended a Certificate of Environmental Compatibility (CEC) for the project. On Aug. 16, 2005, The Arizona Corporation Commission (ACC) voted unanimously (5-0) to confirm a CEC for the project.
The PW-SEV/BRG transmission line, in conjunction with the PV-PW transmission project, will span a total of approximately 130-150 miles.

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).

An extensive siting process was conducted for the PV-PW and PW-SEV/BRG projects to determine the most appropriate location for each within an approximate 2000-square-mile study area (534K PDF). View the project timeline.
History of Public Meetings for PV-PW and PW-SEV/BRG 500kV Projects
| Type of Meeting |
Meeting Date |
Meeting Location |
| Phase 1 Open House |
July 16, 2002 |
Casa Grande, AZ |
| Phase 1 Open House |
July, 17 2002 |
Coolidge, AZ |
| Phase 1 Open House |
July 18, 2002 |
Apache Junction, AZ |
| Phase 1 Open House |
July 23, 2002 |
Maricopa, AZ |
| Phase 1 Open House |
July 24, 2002 |
Arlington, AZ |
| Phase 2 Open House |
October 8, 2002 |
Casa Grande, AZ |
| Phase 2 Open House |
October 9, 2002 |
Coolidge, AZ |
| Phase 2 Open House |
October 10, 2002 |
Queen Creek, AZ |
| Phase 2 Open House |
October 15, 2002 |
Maricopa, AZ |
| Phase 2 Open House |
October 16, 2002 |
Stanfield, AZ |
| Phase 3 Open House |
December 9, 2002 |
Casa Grande, AZ |
| Phase 3 Open House |
December 10, 2002 |
Coolidge, AZ |
| Phase 3 Open House |
December 11, 2002 |
Queen Creek, AZ |
| Phase 3 Open House |
December 12, 2002 |
Maricopa, AZ |
| Phase 3 Open House |
December 16, 2002 |
Arlington, AZ |
| Public Information Meeting |
February 13, 2003 |
Mobile, AZ |
| Public Information Meeting |
November 17, 2003 |
Mobile, AZ |
| Developer Workshop |
June 1, 2004 |
Scottsdale, AZ |
| Developer Workshop |
June 2, 2004 |
Scottsdale, AZ |
| Developer Workshop |
June 3, 2004 |
Scottsdale, AZ |
| Phase 4 Open House |
July 26, 2004 |
Casa Grande, AZ |
| Phase 4 Open House |
July 27, 2004 |
Coolidge, AZ |
| Phase 4 Open House |
July 28, 2004 |
Queen Creek, AZ |
| Phase 4 Open House |
July 29, 2004 |
Maricopa, AZ |
| Neighborhood Meeting |
August 26, 2004 |
Hidden Valley, AZ |
| Open House |
September 9, 2004 |
Hidden Valley, AZ |
| Open House |
September 30, 2004 |
Hidden Valley, AZ |
| Browning 500kV/230kV Construction Open House |
Nov. 2, 2006 |
Mesa, AZ |
Visit the Arizona Corporation Commission (ACC) Web site for answers to frequently asked questions about transmission line siting.

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

If you have questions or comments about the project, please contact us.
E-mail: Send questions to webmaster@azpower.org.
Telephone: Call SRP Public Involvement at (602) 236-2872 or (800) 380-6123
Information request form: For questions about the project, complete our online request for information form.

*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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