Rosemont 138 kV
Project contingent on mine approval.
The Arizona Corporation Commission (ACC) voted unanimously in May 2012 to allow construction of a new transmission line to serve the proposed Rosemont Copper mine in the Santa Rita Mountains southeast of Tucson.
Due to delays to the development of the proposed mine, in 2022 TEP requested, and the Arizona Corporation Commission approved, a seven-year extension of the original Certificate of Environmental Compatibility (CEC) authorizing construction of the transmission line before June 2029.
In 2023, TEP requested an amendment to the CEC removing specific requirements of Condition 23 of the original CEC that were now obsolete. The Arizona Corporation Commission reviewed and approved the amended CEC in May 2023.
For project related inquiries, please call (520) 396-2968.
Project Archive
ACC Decision No. 73232 (Order Granting CEC) – PDF 1319 KB
Open Meeting May 23, 2012 – PDF 305 KB
Open Meeting, May 10, 2012– PDF 228 KB
Procedural Conference, April 19, 2012– PDF 197 KB
Open Meeting, March 15, 2012– PDF 443 KB
In July 2022, the ACC granted TEP's request to extend the deadline for construction to June 2029.
In May 2023, the Arizona Corporation Commission granted TEP’s request to amend Condition 23 of the CEC.
Volume 1 – PDF 406 KB
Volume 2 – PDF 387 KB
Volume 3 – PDF 420 KB
Volume 4 – PDF 311 KB
Prehearing – PDF 137 KB
The CEC application is a large document. To facilitate faster downloading, we have broken the document into sections available via PDF links. The complete application and higher-resolution versions of the three large maps are available below.
Cover and Introduction – PDF 1448 KB
Exhibit A – location and land use – PDF 34 KB
Exhibit A-1 – Lower resolution Preferred and Alternative Route Map – PDF 843 KB
Exhibit A-2 – Lower resolution Existing Land Use Map – PDF 861 KB
Exhibit A-3 – Lower resolution Future Land Use Map – PDF 920 KB
Exhibit B – Environmental Report – PDF 404 KB
Exhibit C – Areas of Biological Wealth – PDF 181 KB
Exhibit D – Biological Resources – PDF 150 KB
Exhibit E – Scenic Areas, Historic Sites and Structures, and Archaeological Sites – PDF 1488 KB
Exhibit F – Recreational Purposes and Aspects – PDF 29 KB
Exhibit G – Concepts of Proposed Facilities – PDF 346 KB
Exhibit H – Existing Plans – PDF 2115 KB
Exhibit I – Anticipated Noise and Interference with Communication Signals – PDF KB
Exhibit J – Special Factors – PDF 72 KB
Exhibit J-1 – Stakeholder Group Information Packets – PDF 8257 KB
Exhibit J-2 – Project Newsletters – PDF 1217 KB
Exhibit J-3 – Public Meeting Boards – PDF 32035 KB
Exhibit J-4 – Website – PDF 1245 KB
Exhibit J-5 – Agency Letters Received – PDF 8554 KB
Complete Certificate of Environmental Compatibility (CEC) Application – PDF 125 MB
CEC Exhibit 1 - Preferred and Alternative Route Map – PDF 26,518 KB
CEC Exhibit 2 - Existing Land Use Map – PDF 26,518 KB
CEC Exhibit 3 - Future Land Use Map – PDF 28,866 KB
Project Newsletter No. 5, November 2011 PDF 805 KB
Project Newsletter No. 4, October 2010 PDF 1044 KB
Preferred and Alternative Route Map PDF 1898 KB
Interactive Project Map – August 2010
Project Newsletter No. 3, March 2010 – PDF 1898 KB
Project Newsletter No. 2, August 2009 – PDF 1118 KB
Project Newsletter No. 1, March 2009 – PDF 1483 KB
Project Fact Sheet, November 2008 – PDF 601 KB
Map of Potential Transmission Line Route Segments, August 2009 – PDF 3094 KB
Project Area Map Showing Land Jurisdiction and Ownership, March 2009 – PDF 1858 KB
Alternative Route Options (March 2010)
46 kV Family
Option No. 1 Helvetia Route via links 105, 155, Helvetia construction power option – PDF 776 KB
Option No. 2 Helvetia Route via links 130, 135, Helvetia construction power option – PDF 776 KB
Option No. 4 Greaterville Route, Greaterville construction power option – PDF 775 KB
Option No. 6 Helvetia Route via links 105, 155, Greaterville construction power option – PDF 776 KB
North Route Family
Option No. 3 Greaterville construction power option – PDF 776 KB
Option No. 8 Helvetia construction power via links 130, 135 option – PDF 776 KB
Option No. 10 Helvetia construction power via links 105, 155 option – PDF 776 KB
Santa Rita Route Family
Option No. 1 via links 105, 155, Greaterville construction power option – PDF 776 KB
Option No. 3 via links 130, 135, Greaterville construction power option – PDF 776 KB
Option No. 7 via links 105, 155, Helvetia construction power option – PDF 776 KB
Option No. 9 via links 130, 135, Helvetia construction power option – PDF 776 KB
Full Set of Displays – PDF 12.52 MB
Public Open House Meeting No. 4 – PDF 16 KB
Project Overview – PDF 39 KB
Purpose and Need – PDF 38 KB
Project Description – PDF 38 KB
Proposed Structure Type(s) – PDF 91 KB
Proposed Switchyard/Substation – PDF 93 KB
Ownership and Jurisdiction Map – PDF 1431 KB
Planning Process – PDF 38 KB
Planning Process Chart – PDF 100 KB
Certificate of Environmental Compatibility Application Process – PDF 77 KB
Key Considerations for Selection of Recommended Routes – PDF 38 KB
Example Corridor and Right-of-Way Configuration – PDF 73 KB
Example Section of Transmission Line and Pipeline Right-of-Way – PDF 74 KB
Environmental Analysis Summary – PDF 38 KB
Existing Land Use Map – PDF 1460 KB
Future Land Use Map – PDF 1393 KB
Parks, Recreation and Open Space Map – PDF 1439 KB
Biological Resources Map – PDF 1485 KB
Visual Resources Map – PDF 1413 KB
Scenic Quality Map – PDF 923 KB
Simulations Maps – PDF 263 KB
Photo Simulation Map - Santa Rita Rd. – PDF 325 KB
Photo Simulation Map - Helvetia Rd. – PDF 319 KB
Photo Simulation Map - Box Canyon Rd. – PDF 293 KB
Photo Simulation Map - Quail Creek Community – PDF 329 KB
Photo Simulation Map - Sahuarita Highlands – PDF 348 KB
Photo Simulation Map - Kolb Rd. – PDF 214 KB
Transmission Line Alternative Routes Map – PDF 227 KB
Alternative Routes Summary Table – PDF 15 KB
Alternative Routes Recommended to be Carried Forward – PDF 38 KB
Preferred Route Map – PDF 665 KB
Alternative 1 Map – PDF 664 KB
Alternative 2 Map – PDF 664 KB
Alternative 3 Map – PDF 664 KB
Alternative 4 Map – PDF 623 KB
Electric and Magnetic Fields (EMF) – PDF 53 KB
Agency and Public Participation Activities – PDF 37 KB
Public Participation Opportunities – PDF 38 KB
Comments – PDF 38 KB
TEP Decision Elements – PDF 37 KB
Next Steps – PDF 37 KB
Court Reporter – PDF 37 KB
Full Set of Displays – PDF 544 KB
Project Overview – PDF 69 KB
Purpose and Need – PDF 67 KB
Project Description – PDF 67 KB
Proposed Structure Type – PDF 229 KB
Proposed Switchyard_Substation – PDF 159 KB
Ownership and Jurisdiction Map – PDF 595 KB
Planning Process – PDF 69 KB
Planning Process Chart – PDF 354 KB
CEC Application Process – PDF 175 KB
Key Terms Defined – PDF 67 KB
Example Corridor and ROW Diagram – PDF 128 KB
Environmental Ananysis Summary – PDF 67 KB
Existing Land Use Map – PDF 579 KB
Future Land Use Map – PDF 618 KB
Parks, Recreation, and Open Space Map – PDF 557 KB
Biological Resources Map – PDF 602 KB
Visual Resources Map – PDF 623 KB
Scenic Quality Map – PDF 623 KB
Santa Rita Experimental Range – PDF 429 KB
Simulations Map – PDF 67 KB
Photo Simulation 1 - Santa Rita Rd – PDF 31 KB
Photo Simulation 2 - Helvetia Rd – PDF 144 KB
Photo Simulation 3 - Box Canyon Road – PDF 188 KB
Photo Simulation 4 - Quail Creek Community – PDF 156 KB
Photo Simulation 5 - Sahuarita Highlands – PDF 131 KB
Photo Simulation 6 - Kolb Rd – PDF 307 KB
Alternative Route Families – PDF 144 KB
Alternatives Comparison Table – PDF 67 KB
Alternative Routes (11) Map – PDF 39 KB
Alternative Routes Recommended to be Carried Forward – PDF 642 KB
Santa Rita Road Options 1 and 3 Map – PDF 67 KB
Adjacent 46kV Route Options 1, 2, and 4 Map – PDF 134 KB
Electric and Magnetic Fields – PDF 454 KB
Agency and Public Participation Activities – PDF 92 KB
Public Participation Opportunities – PDF 66 KB
Comments – PDF 67 KB
Decision Elements – PDF 66 KB
Next Steps – PDF 66 KB
Maps – PDF 544 KB
Parks & Recreation Map – PDF 1.34 MB
Opportunities & Constraints Map – PDF 1.34 MB
Juris & Ownership with Preliminary 500 Ft. Corridor – PDF 1415 KB
Juris & Ownership with Preliminary Links – PDF 1390 KB
Juris & Ownership with March & July Study Area Boundaries – PDF 1820 KB
Future Linear Corridors Map – PDF 1331 KB
Biological Resources Map – PDF 1449 KB
Visual Resources Map – PDF 1452 KB
Future Land Use Map – PDF 1350 KB
Existing Land Use Map – PDF 1435 KB
Aerial Imagery Map – PDF 883 KB
Full Set of Displays – PDF 271 KB
Title Board – PDF 292 KB
Project Overview – PDF 59 KB
Purpose & Need – PDF 62 KB
Project Description – PDF 64 KB
Proposed Structure Types – PDF 77 KB
Proposed Switchyard – PDF 1.60 MB
Technical Engineering Studies – PDF 501 KB
Environmental Studies – PDF 72 KB
Santa Rita Experimental Range – PDF 554 KB
Resource Sensitivity Overview – PDF 533 KB
Resource Sensitivity Overview (continued) – PDF 563 KB
Opportunities & Constraints – PDF 511 KB
Siting Criteria – PDF 557 KB
Key Terms Defined – PDF 480 KB
Preliminary Link Alternative Identification – PDF 520 KB
Link Alternative Screening & Route Identification – PDF 547 KB
TEP Decision Elements – PDF 491 KB
Public Participation Opportunities – PDF 515 KB
Next Steps – PDF 477 KB
Full Set of Displays – PDF 6.5 MB
Project Overview – PDF 59 KB
Jurisdiction and Ownership – PDF 672 KB
Purpose and Need – PDF 64 KB
Project Description – PDF 486 KB
Proposed Structure Types – PDF 1502 KB
Vail Substation and South Substation – PDF 204 KB
Planning Process and Responsibilities – PDF 367 KB
Transmission Line Siting Process – PDF 176 KB
Environmental Studies Overview – PDF 72 KB
Aerial Imagery – PDF 964 KB
Existing Land Use – PDF 599 KB
Future Land Use – PDF 685 KB
Parks, Open Space and Recreation Areas – PDF 715 KB
Future Linear Corridors – PDF 528 KB
Visual Resources – PDF 723 KB
Biological Resources – PDF 569 KB
Opportunities and Constraints Analysis – PDF 83 KB
Draft Transmission Line Siting Criteria – PDF 35 KB
Opportunities and Constraints Composite Map – PDF 668 KB
Initial Agency/Organization Contacts – PDF 84 KB
Public Participation Opportunities – PDF 72 KB
Next Steps – PDF 56 KB
