Projects and Resource Planning

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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.

Overview

System Improvements

TEP has made plans for construction of a new 13-mile, 138-kilovolt (kV) transmission line that would link the proposed Toro Switchyard near Green Valley to the site of the proposed Rosemont Copper mine in the Santa Rita Mountains. Construction would begin only after the Rosemont Copper facility receives all necessary permits to develop and operate the mine. For information on the status of the Rosemont permitting process, please visit http://rosemonteis.us.

More Information

Certificate of Environmental Compatibility (CEC) – PDF 1319 KB
Approved Line Route – PDF 541 KB

Project Archive

Arizona Corporation Commission Review

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

Transcripts: Arizona Power Plant and Transmission Line Siting Committee Hearing (December 2011)

Volume 1 – PDF 406 KB

Volume 2 – PDF 387 KB

Volume 3 – PDF 420 KB

Volume 4 – PDF 311 KB

Prehearing – PDF 137 KB

CEC Application, November 2011

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

Nov. 17, 2010 Open House Meeting (Sahuarita)

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

April 14–15, 2010 Open House Meetings (Corona de Tucson, Sahuarita)

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 & Contraints 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

August 27, 2009 Open House Meeting (Sahuarita)

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

March 24–25, 2009 Open House Meetings (Vail, Green Valley)

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

FAQ

Transmission lines are necessary to allow energy to flow from power plants to major substations.

TEP is committed to strengthening the transmission system, which is the backbone of our electrical grid, and allows customers to power their homes and businesses.

What transmission line projects has TEP proposed?

TEP is always improving and expanding its system to maintain safe, reliable service for customers. When this work involves establishing new routes for transmission lines that operate at or above 115 kilovolts (kV), the company must secure approval from the Arizona Corporation Commission (ACC) before proceeding with construction. These "line-siting" projects also are reviewed by the Arizona Power Plant and Transmission Line Siting Committee before the ACC takes action. Since public participation is welcomed in this review process, TEP makes information about such projects available on this Web site.

When will the ACC take action on these cases?

TEP typically spends six months or more engaged in a public planning process before requesting a Certificate of Environmental Compatibility (CEC) that would authorize construction of a new or upgraded transmission line. The Line Siting Committee then reviews the company's proposal before forwarding a recommendation to the ACC for consideration in a public meeting.

Specific timelines for individual projects are included in the fact sheets or newsletters posted on the pages devoted to those projects on this Web site.

How can I get involved?
TEP welcomes public input in its line siting projects. Your first opportunity to get involved is to participate in public meetings that will be held throughout the process of identifying potential routes for a proposed line. Information about these meetings is posted on this Web site and included in newsletters sent to residents in the study area of a proposed project as well as others who request them. You can submit written comments about the projects during these meetings, by mail or through online comment forms available on this Web site.

Once TEP has filed a CEC application, you may provide public comments to the Line Siting Committee during its review of the proposed project. This input may be submitted in writing or offered during the committee's public hearings. The time and location of these meetings will be posted on this Web site.

You also have the option of intervening in the case, which would make you a party to the committee's quasi-judicial process. Interveners receive notice of all meetings, technical conferences, hearings and proceedings. If you become an intervenor, you will have the option to submit substantive testimony or utilize expert witnesses about the technical aspects of the proposals. You also will be subject to cross-examination on any testimony you may provide.

Once the Line Siting Committee has forwarded its recommendation to the ACC, you may submit written comments to the Commission or offer public comment during the open meeting when the proposed project is set to be considered.
What other permits may be required before TEP can build a transmission line?

If a new or expanded substation is included as part of a proposed project, that facility may be subject to local permitting requirements. Additional permits may also be required for crossings of highways and railroads and for other special circumstances.

Will these proposed lines produce electric and magnetic fields (EMFs)?

EMFs can be generated by anything that conducts electricity, including electric lines, office equipment and home appliances. High-voltage transmission lines do generate EMFs, but the strength of those fields diminish with distance. The National Institute for Occupational Safety and Health and other government agencies do not consider EMFs a proven health hazard, although research into their possible health effects is ongoing.

To learn more, you can review the available research posted by the following federal health agencies.

  • National Institute of Environmental Health Sciences
    EMF Electric and Magnetic Fields Associated with the Use of Electric Power (2002 Summary Report)
  • Centers for Disease Control
    EMFs In the Workplace
Will these proposed lines affect the value of my property?

It depends on the details of the project and the property in question as well as larger economic trends affecting the local real estate market. Research into this question suggests that while property values may fall slightly after transmission lines are built nearby, they typically rebound in relatively short order. For more information, please review the following studies.

Resource Planning

Safe, Reliable Power for the Future

Tucson Electric Power (TEP) is diversifying its portfolio of resources in response to new environmental regulations, emerging technology and changes in our customers’ energy needs.  To inform regulators, customers and other interested stakeholders about these and other changes, TEP and its sister company, UniSource Energy Services (UES), have developed Integrated Resource Plans (IRPs).   These IRPs present the detailed assumptions and analyses used to develop the companies’ strategies for serving customers’ long-term energy needs.

2017 IRP

2016 IRP

TEP and UES Supplement to 2016 Preliminary Integrated Resource Plans PDF 786 KB

TEP 2016 Preliminary Integrated Resource Plan – PDF 12 MB

TEP 2016 Preliminary Integrated Resource Plan Update (ACC Workshop) - PDF 12 MB

UES 2016 Preliminary Electric Integrated Resource Plan – PDF 8.15 MB

IRP Archive (2013-2014)

2014 IRP

TEP 2014 Integrated Resource Plan – PDF 20.5 MB

UES 2014 Electric Integrated Resource Plan – PDF 13.8 MB

2013 IRP Workshop

On November 22, 2013, TEP and UES hosted a workshop on the 2014 IRP. As a business planning function, the IRP provides TEP and UES with a strategic roadmap to ensure repable, cost effective electric service while managing risk and future uncertainty for its customers. The workshop was designed to share information and seek stakeholder input on its potential resource planning alternatives.

Presentations

View or download the presentations from the IRP workshop.

Agendas

2014 IRP Introduction and Overview (Sheehan) – PDF 1290 KB

2014 IRP History of UNS Energy (TEP and UNSE) (Battaglia) – PDF 4161 KB

2014 IRP Retail Sales and Demand Forecasts (Thiltges) – PDF 751 KB

2014 IRP Demand Side Management (DSM) (Baruch) – PDF 810 KB

2014 IRP Environmental Regulation and BART (Bakken) – PDF 1817 KB

2014 IRP Renewables and DG (Tilghman) – PDF 867 KB

2014 IRP Market Outlook and Risk Modeling (Bowman) – PDF 1041 KB

2014 IRP UNS Loads and Resources (Aguirre) – PDF 662 KB

2014 IRP Reference Cases (Sheehan) – PDF 3370 KB

Guest Speakers (University of Arizona)

2014 IRP Climate Change in the Southwest (Garfin) – PDF 8675 KB

2014 IRP Real-Time PV Power Forecasting (Holmgren-UofA) – PDF 2315 KB

2014 IRP Renewable Forecasting System (Holmgren & Leuthold-UofA)– PDF 1544 KB

Provided by SWEEP (not in attendance);

SWEEP - ACEEE_EE & IRP_Zuckerman1146 – PDF 567 KB

SWEEP - EE & IRP_LBNL_Aug2006 – PDF 646 KB

SWEEP - RPWhenEEMattersEZSWEEP_081612f – PDF 1181 KB

Harrison Substation

New substation for continued reliability

TEP is proposing to build a new 138-kilovolt (kV) substation at the northwest corner of North Harrison Road and East Speedway Boulevard that will help ensure continued reliability and satisfy customers' future energy needs.

Project Overview

Substation Information

The proposed Harrison Substation is a priority for TEP to ensure capacity and reliability to current and future residential and commercial customers on Tucson's east side. Three existing substations that serve the area are operating at or above capacity.

The proposed substation will connect to the existing 138-kV transmission line located along the south side of East Speedway Boulevard. The substation would improve electric reliability and reduce the frequency and duration of electrical service outages. The substation also would accommodate anticipated future growth in the area. The need for a substation in the area has been identified in long-term transmission plans filed with the Arizona Corporation Commission.

Fact Sheet and Map

If you have any questions regarding this project, please call (520) 884-3642.

Project Archive
City Code

For more information about the City of Tucson’s development code, click the link below.

City of Tucson Unified Development Code

  • Special Exception Land Uses: Section 3.4
  • Zoning Examiner Special Exception Procedure: Section 3.4.3
  • Commercial Zone: Section 4.7.20
  • Permitted Uses: Commercial and Mixed Use Zones: Section 4.8.6 and Table 4.8-4
  • Utilities Use Group Standards: Section 4.9.11

Transmission Line Projects

Substation